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48results about How to "Inhibition of lithium dendrites" patented technology
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Inorganic-organic nano composite solid electrolyte membrane and preparation method and application thereof
ActiveCN109638349AImprove compatibilityEasy transferSolid electrolytesFinal product manufactureSolid state electrolyteHigh energy
The present invention discloses an inorganic-organic nano composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte is a novel inorganic-organic nanocomposite combining the respective advantages of inorganic ceramic solid electrolyte and organic polymer electrolyte and is composed of a negative electrode protective layer, a support layerand a positive electrode interface layer. The support layer plays a supporting role, and the main component of the negative electrode protective layer is the inorganic solid electrolyte with good mechanical properties, which can effectively inhibit the growth of lithium dendrite; and the positive electrode interface layer is mainly composed of organic polymer electrolyte with good flexibility, ensures good contact with active materials and provides a continuous ion transport channel. In the present invention, the composite solid electrolyte with good interface compatibility is prepared by coating on both sides of the support layer, and the process is simple and efficient. The composite solid electrolyte can effectively inhibit dendritic crystal and reduces interface resistance so that a solid lithium metal battery has higher energy density and longer cycle life.
Owner:SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
Solid electrolyte having room-temperature conductivity polymer matrix and preparation method thereof
InactiveCN108365258AImprove securityInhibition of lithium dendritesSolid electrolytesFinal product manufactureSolid state electrolyteElectrical battery
The invention discloses a solid electrolyte having a room-temperature conductivity polymer matrix and a preparation method thereof. According to the invention, an organic polymer is taken as the matrix, lithium salt and inorganic material particles are uniformly doped, the inorganic material particles form ordered distribution on the solid electrolyte along a radial direction, the inorganic material particles form a fast ion channel at an electrolyte interface position, and a fast ionic conductor structure is formed. the inorganic material particles in an electrolyte are subjected to polarization by using an electric field, the particles have the fast ion channel at the electrolyte interface position, the particles with ordered distribution can form a chain by polarization, the fast ion channel can be radially formed in the electrolyte, and the conductivity is increased. The solid electrolyte has the characteristics of high room temperature conductivity and good mechanical property, can be used for the room temperature solid lithium ion cell electrolyte, the room temperature solid lithium ion battery of the solid electrolyte has high charge and discharge multiplying power, cycle stability and security, and can be used for hand-held electronic equipment and electric automobile and the like.
Owner:SHANGHAI UNIV
Production method of lithium/carbon fiber or porous carbon paper/copper foil composite negative electrode used for lithium-sulfur battery
InactiveCN106711430ALarge specific surface areaHigh porosityElectrode carriers/collectorsElectrode collector coatingFiberCarbon fibers
The invention discloses a production method of a lithium / carbon fiber or porous carbon paper / copper foil composite negative electrode used for a lithium-sulfur battery. The method comprises the following steps: producing a carbon fiber / copper foil negative electrode from carbon fibers, conductive carbon and a binder through a coating technology, and embedding and depositing lithium through an electrochemical technology to produce the lithium / carbon fiber / copper foil composite negative electrode; or superposing copper foil and porous carbon paper to produce a porous carbon paper / copper foil negative electrode, and embedding and depositing lithium through the electrochemical technology to produce the lithium / porous carbon paper / copper foil composite negative electrode. The lithium / carbon fiber or porous carbon paper / copper foil composite negative electrode is flexible, can be easily reeled, can be used in the lithium-sulfur battery, and has the advantages of dendrite growth inhibition, high coulombic efficiency, high specific capacity and good electrochemical characteristics.
Owner:CENT SOUTH UNIV
Single-ion polymer electrolyte system as well as preparation method and application thereof
ActiveCN111326788AOvercoming poor mechanical propertiesGrowth inhibitionSolid electrolytesSulfonic acid amide preparationMethacrylatePolythylene glycol
The invention belongs to the related field of polymer electrolyte systems. The invention discloses a single-ion polymer electrolyte system as well as a preparation method and application thereof. Thesingle-ion polymer electrolyte system is composed of a single-ion polymer electrolyte and a metal salt, wherein the single-ion polymer electrolyte is obtained by carrying out reversible addition-fragmentation chain transfer polymerization reaction on three monomers including a single-ion conductor lithium salt containing a p-styrenesulfonyl group, UPyMA containing quadruple hydrogen bonds and methoxypolyethylene glycol methacrylate. According to the invention, the key structure and related composition in the single-ion polymer electrolyte system, the overall process flow of the preparation method and other aspects are optimally designed; and, compared with the prior art, the invention is advantageous in that not only can the phenomenon that a polymer electrolyte system is easy to crack bebetter solved, but also the metal ion transference number and the ionic conductivity can be remarkably improved, and meanwhile, the growth of metal dendrites is effectively inhibited, so that the polymer electrolyte is particularly suitable for the field of metal ion batteries such as lithium ion batteries.
Owner:HUAZHONG UNIV OF SCI & TECH
Lithium-supplementing negative electrode and application thereof
InactiveCN113097448AImprove cycle performanceCyclic performance impactNegative electrodesSecondary cellsLithium-ion batteryActive layer
The invention provides a lithium-supplementing negative electrode and application thereof. The lithium-supplementing negative electrode comprises a negative electrode current collector, a negative electrode active layer arranged on at least one functional surface of the negative electrode current collector and a lithium-supplementing layer arranged on the surface of the negative electrode active layer, wherein the lithium-supplementing layer comprises lithium powder and a lithium ion conductive agent. The lithium-supplementing negative electrode not only can efficiently supplement the active lithium loss of the lithium ion battery, but also can greatly reduce the lithium precipitation risk caused by lithium supplementation, thereby ensuring the cycle performance and safety of the lithium ion battery in the long-term application process.
Owner:KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
Preparation method of metal lithium negative electrode with hydrophobic protective layer
ActiveCN111403692AImprove bindingLow priceSecondary cellsNegative electrodesSolid state electrolyteMetallic lithium
A preparation method of a metal lithium negative electrode with a hydrophobic protective layer comprises the following steps: 1, mixing a hydrophobic compound and a film-forming agent in a mass ratioof (0.5-3): 1 to obtain a hydrophobic mixture; 2, dissolving the hydrophobic mixture in a solvent, and uniformly mixing to obtain a protection solution, wherein the mass percentage of the hydrophobicmixture in the protective solution is 5-50%; 3, coating at least one surface of the ultrathin metal lithium foil with the protective solution in dry inert gas, and then performing curing treatment toobtain a metal lithium negative electrode with a hydrophobic protective layer on at least one surface, wherein the thickness of the single-sided hydrophobic protective layer is 100 nanometers to 10 microns. The technical problems that the metal lithium negative electrode is extremely unstable in air, the interface impedance of the metal lithium negative electrode and the solid electrolyte is too large when the metal lithium negative electrode is used as the negative electrode of the solid-state lithium battery, and lithium dendrites are generated in the circulation process when the metal lithium negative electrode is used as the negative electrode of the lithium ion battery are solved.
Owner:重庆天齐锂业有限责任公司
All-solid-state lithium battery and preparation method thereof
ActiveCN113140731AIncrease energy densityImprove securityFinal product manufactureElectrode carriers/collectorsAll solid stateHigh energy
The invention discloses an all-solid-state lithium battery and a preparation method thereof. The all-solid-state lithium battery comprises a positive electrode, a negative electrode, a ceramic electrolyte layer and polymer solid electrolyte dispersed on the surfaces and gaps of the positive electrode, the negative electrode and the ceramic electrolyte layer, wherein the positive electrode comprises a positive electrode collector and a positive electrode layer attached to the surface of the positive electrode collector, the positive electrode layer comprises a positive electrode active material, and the surface of the positive electrode active material is coated with a high-voltage-resistant ceramic electrolyte; the negative electrode comprises a negative electrode collector and a surface modification layer attached to the surface of the negative electrode collector, and the surface modification layer comprises a carbon material and a binder. The ceramic electrolyte layer comprises a low-voltage-resistant ceramic electrolyte and a polymer binder; the coating can be independently layered or attached to the surface of a positive electrode; the polymer solid electrolyte comprises a polymer phase and a lithium salt dispersed in the polymer phase. The all-solid-state lithium battery disclosed by the invention has excellent safety performance, high energy density and excellent cycle stability.
Owner:ZHEJIANG UNIV
Lithium bis(fluorosufonyl)imide/1, 3-dioxolane lithium battery gel electrolyte, preparation method thereof and battery
InactiveCN109494400ASimple preparation processLow costLi-accumulatorsElectrolyte immobilisation/gelificationLithium vanadium phosphate batteryLithium iron phosphate
The invention provides a lithium bis(fluorosufonyl)imide / 1, 3-dioxolane lithium battery gel electrolyte, a preparation method thereof and a battery and belongs to the technical field of lithium batteries. The preparation method comprises taking lithium bis(fluorosufonyl)imide and 1, 3-dioxolane as precursors to dissolve and uniformly mix the lithium bis(fluorosufonyl)imide inside the 1, 3-dioxolane, and ensuring the concentration of the lithium bis(fluorosulfonyl)imide in the mixed solution is 3-4 molL<-1>; standing the mixed solution in a sealed state so that the 1, 3-dioxolane can be gradually polymerized under the catalytic effects of the lithium bis(fluorosulfonyl)imide to form the lithium bis(fluorosufonyl)imide / 1, 3-dioxolane lithium battery gel electrolyte. The lithium bis(fluorosufonyl)imide / 1, 3-dioxolane lithium battery gel electrolyte has the advantages of being wide in electrochemical window, stable in effects on lithium negative electrodes, good in lithium dendrite growthinhibiting effects and the like, and can greatly improve the circulating efficiency of the lithium negative electrodes. Meanwhile, the lithium bis(fluorosufonyl)imide / 1, 3-dioxolane lithium battery gel electrolyte is simple in preparation, low in price of raw materials and energy and applicable to large-scale industrialized production as well as to lithium batteries with various positive electrodematerials such as lithium-sulfur batteries, lithium-lithium ion phosphate batteries, lithium-lithium cobalt oxide batteries and lithium-air batteries.
Owner:ZHEJIANG UNIV
Polymer-based solid electrolyte with high room-temperature ionic conductance as well as preparation method and application thereof
ActiveCN112436188AReduce crystallinityImprove ionic conductivitySolid electrolytesLi-accumulatorsSolid state electrolytePolymer electrolytes
The invention discloses a polymer-based solid electrolyte with high room-temperature ionic conductance as well as a preparation method and application thereof. The polymer-based solid electrolyte is formed by compounding main raw materials including a macromolecular polymer monomer, a micromolecular polymer monomer, a lithium salt and a boron nitride nanosheet through chemical action, wherein themass ratio of the macromolecular polymer monomer to the micromolecular polymer monomer to the lithium salt to the boron nitride nanosheet is 20-30:20-30:30-35:3-5. An in-situ cross-linking graft polymerization strategy is adopted, a precursor solution is directly dropwise added to an electrode plate, good contact can be achieved, and therefore interface impedance and interface side reactions are reduced, and the cycling stability of the whole battery is improved. The polymer-based electrolyte prepared by the invention has good electrochemical stability, thermodynamic stability and good ionic conductivity, provides a new thought for preparation and optimization of the polymer electrolyte, and is beneficial to industrialization of all-solid-state batteries.
Owner:HARBIN INST OF TECH
Composite electrolyte and application thereof
ActiveCN111613830AGood chemical stabilityImprove conductivitySolid electrolytesSecondary cellsSolid state electrolyteElectrolytic agent
The invention discloses a composite electrolyte and application thereof, the composite electrolyte comprises a gel electrolyte coated on a lithium negative electrode and a quasi-solid electrolyte coated on a positive electrode, and the gel electrolyte is in contact with the quasi-solid electrolyte; electrolyte is adsorbed in the quasi-solid electrolyte; both the gel electrolyte and the quasi-solidelectrolyte contain the same conductive lithium salt; the invention also discloses application of the composite electrolyte to a lithium ion battery. According to the invention, through cooperation of the two electrolytes, lithium dendrites are inhibited, and the composite electrolyte is ensured to have good conductivity.
Owner:南通赛得能源有限公司
Electrolytic solution for lithium-sulfur battery
ActiveCN107845831AImprove Coulombic efficiencyImprove cycle stabilitySecondary cellsLithium–sulfur batteryPolysulfide
The invention relates to an electrolytic solution for a lithium-sulfur battery. The electrolytic solution comprises an electrolyte and a solvent, and is further added with a positive electrode protection agent, wherein the protection agent is one or more than two selected from N,N-carbonyldiimidazole (CDI), N,N-carbonyldiimidazolesulfamide and thiocarbonyldiimidazole, and the addition amount of the positive electrode protection agent is 0.1-5% of the mass of the active substance contained in the positive electrode of a lithium-sulfur battery. Compared to the electrolytic solution in the priorart, the electrolytic solution of the present invention has the following characteristics that the solvent contains the positive electrode protection agent (containing -N bond / -S bond), such that thedissolved sulfur or polysulfide can be effectively adsorbed, the shuttle effect in the lithium-sulfur battery can be inhibited, and the coulombic efficiency of the battery can be improved so as to improve the cycle stability of the battery.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Solid-state lithium ion conductor, preparation method and application thereof
ActiveCN110323489ASimple methodLow costFuel and secondary cellsSecondary cellsElectrical conductorElectron
The invention relates to a solid-state lithium ion conductor, a preparation method and application thereof, and belongs to the field of secondary batteries. LiOH reacts with alkyl aluminum to obtain the solid-state lithium ion conductor of a polycrystal compound containing LiAlO2 and Li3AlO3. Preferably, the reaction is performed in a liquid electrolyte, and the electrolyte is a solution obtainedby dissolving a lithium salt into an organic solvent. Preferably, LiOH is obtained by a lithium on-chip in-situ reaction or powdery LiOH. Electrodes of the solid-state lithium ion conductor prepared in the invention are high in ionic conductivity at room temperature and low in electronic conductivity, and the solid-state lithium ion conductor is tightly combined with lithium metal so that the interface contact resistance can be greatly reduced. The prepared solid-state lithium ion conductor is applied into metal lithium batteries, the problem of lithium dendrites can be improved effectively and obviously, and lithium metal is protected, so that the cycle performance of the metal lithium batteries is promoted comprehensively. The solid-state lithium ion conductor prepared by the method doesnot need heating, the preparation technology is simple, and the cost is low.
Owner:HUAZHONG UNIV OF SCI & TECH
Lithium metal interface modification method for room-temperature solid-state battery
InactiveCN111200166AAchieving room temperature workInhibition of lithium dendritesFinal product manufactureElectrolyte accumulators manufactureSolid-state batteryLithium dendrite
The invention relates to a lithium metal interface modification method for a room-temperature solid-state battery, which comprises the steps of S1, adding PEO, LLZTO and a lithium salt into an organicsolvent in an oxygen-free atmosphere to assemble a battery with a negative electrode and a composite electrolyte; and S2, adding an LITFSI / AN solution between the negative electrode of the battery and the composite electrolyte, modifying lithium by using LITFSI, and drying. By adopting the method provided by the invention, the lithium metal interface modification method for the solid-state battery can be provided, lithium dendrites can be inhibited according to the method, the interface impedance can be effectively reduced, and the solid-state battery can work at room temperature. The methodhas the beneficial details that solid-state battery configuration design is performed on a solid-state battery which is high in interface impedance and cannot work at room temperature, so that the electrochemical performance of the solid-state battery is effectively improved.
Owner:BAOSHAN IRON & STEEL CO LTD
Ionic plastic crystal-polymer-inorganic composite electrolyte membrane and preparation method and application thereof
ActiveCN111261932AHigh mechanical strengthImprove conductivitySecondary cellsComposite electrolytePlastic crystal
Owner:SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
Lithium air battery based on a lithium alloy negative electrode
ActiveCN109698396ANegative electrode interface optimizationInhibit the occurrence of lithium dendritesFuel and secondary cellsCell electrodesCarbon dioxideOxide
The invention discloses a lithium air battery based on a lithium alloy negative electrode. The lithium air battery using lithium alloy as a negative electrode is placed in an anhydrous gas atmospherefor at least one cycle of high current pretreatment, wherein the current density of the high current pretreatment is not less than 0.8 mAh.cm<-2>. An oxide film composite SEI protective film containing heterogeneous metal is formed on the surface of the battery through high current pretreatment before normal cycle test, so that the erosion of the electrolyte, water, dissolved oxygen and carbon dioxide in the lithium air battery on the negative electrode can be blocked, the lithium ions can be guided to be uniformly deposited on the surface of the negative electrode, the occurrence of lithium dendrites can be inhibited, and the cycle stability and safety of the battery are greatly improved.
Owner:SHANDONG UNIV
Copper magnetic current collector, preparation process thereof and magnetic lithium air battery containing the same
ActiveCN108878905AReduce local current densityReduce overpotentialFuel and secondary cellsCell electrodesMagnetic currentOver potential
The invention relates to the field of lithium metal air batteries, in particular to a copper magnetic current collector, a preparation process thereof and a magnetic lithium air battery containing thesame. Surface modification is performed on a material with the permanent magnetic property to obtain a negative electrode material of a lithium air battery with large specific surface and high catalytic activity. According to the invention, the mass transfer process of oxygen is enhanced through the micro magnetic field, the concentration of active oxygen on the positive electrode surface is improved by the paramagnetic property of oxygen, the magnetohydrodynamics effect, the magnetization force effect and the like produce disturbance on the electrolyte, so that the reaction activity of the gas-liquid-solid three-phase interface is increased, the polarization is reduced, non-uniform deposition of the negative electrode metal lithium is improved, and the lithium dendrites are inhibited; the catalytic activity of the bifunctional catalyst is increased and the over-potential is reduced by the electric field generated by the copper layer structure; by the structure field energy, the volume change stress is released, the expansion space is provided, a uniform reaction active site and the like are provided, and the overall electrochemical performance is fully improved.
Owner:ZHEJIANG UNIV OF TECH
Solid-state lithium air battery
InactiveCN112151920AInhibition of lithium dendritesAchieve uniform depositionSolid electrolytesFuel and secondary cellsLithium dendriteIn situ polymerization
The invention provides a solid-state lithium air battery. The battery comprises a lithium negative electrode, an electrolyte, an air positive electrode and a packaging shell with an opening and closing function, wherein the electrolyte comprises an electrolyte with a curing function and a diaphragm, the lithium negative electrode, the diaphragm, the air positive electrode and the packaging shell form an accommodating cavity for accommodating the electrolyte, the air positive electrode is connected with the diaphragm, and the diaphragm is a porous film; the electrolyte at least comprises a polymeric monomer and a lithium salt, and the concentration of the lithium salt in the electrolyte is 0.2-7 mol / L. The battery is advantaged in that a polymer or a protective layer can be formed on the surface of the lithium negative electrode through in-situ solidification of the electrolyte, the protective layer can inhibit lithium dendrites, uniform deposition of lithium ions on the negative electrode is achieved, meanwhile, the effect of a gas protective layer is achieved, and direct reaction of oxygen, water, carbon dioxide and other gases with the lithium negative electrode is isolated; besides, after the electrolyte is subjected to in-situ polymerization to form a polymer, a problem of electrolyte volatilization of a liquid system of a traditional lithium-air battery can be solved, so the service life of the lithium-air battery is prolonged, and use safety of the lithium-air battery is improved.
Owner:BEIJING WELION NEW ENERGY TECH CO LTD
Lithium metal electrode and preparation method and application thereof
ActiveCN111987287AReduce preferential depositionImprove stabilityMaterial nanotechnologySecondary cellsMetallic electrodeChemical physics
The invention relates to the technical field of electrode materials, and in particular, relates to a lithium metal electrode and a preparation method and application thereof. A three-dimensional network structure in the lithium metal electrode provided by the invention can effectively accelerate charge transfer and reduce interface resistance; compared with a pure lithium electrode, the specific surface area is large, relatively low local current density can be generated, charge distribution is uniformized, when Li is deposited, a smooth effect is achieved and the growth rate is reduced, an Al2O3 layer and a Li3PO4 layer can accommodate the volume expansion of a battery in the cycle process, the preferential deposition of lithium ions is reduced and the uniform deposition of the lithium metal surface is promoted, so that lithium dendrites are effectively inhibited, the stability of the battery is improved, and the cycle life of the battery is prolonged; the structural characteristics of the lithium metal electrode provided by the invention can reduce the internal stress and interface fluctuation of the material, thereby improving the overall mechanical stability and integrity of the battery.
Owner:BEIJING UNIV OF TECH
A kind of ceramic matrix composite solid electrolyte and preparation method thereof
ActiveCN108336402BImprove ionic conductivityImprove mechanical propertiesSolid electrolytesSecondary cellsElectrolytic agentSolid state electrolyte
The invention discloses a method for preparing a ceramic-based composite solid electrolyte, which is characterized in that: the specific preparation method is as follows: including the preparation of a gel electrolyte, the preparation of a ceramic-based electrolyte and the preparation of a ceramic-based composite electrolyte, wherein the gel electrolyte Preparation, mix acrylate material, cross-linking agent and electrolyte together, stir evenly; add initiator to the above mixed solution, stir evenly after adding; step 2: preparation of ceramic base electrolyte The base pyrrolidone solvent is made into a solution according to the ratio of mass ratio 1:10-20; the fast ion conductor and the lithium salt are added to the above solution according to the metering ratio, and a uniformly dispersed slurry is obtained through stirring, ultrasonication, etc.; the above slurry Evenly coated on a glass plate, dried at 30-60°C for 24 hours, and then vacuum-dried at 50-60°C for 24 hours to obtain an electrolyte membrane with a thickness of 10-150 μm.
Owner:QINGTAO KUNSHAN ENERGY DEV CO LTD
Preparation and application method of composite single-ion solid electrolyte
ActiveCN110336080AImprove securityReduce concentration polarizationMaterial nanotechnologyFinal product manufactureUltraviolet lightsSolvent
The invention relates to a preparation technology of lithium ion battery electrolytes, and aims to provide a preparation and application method of a composite single-ion solid electrolyte. The methodcomprises the steps of: taking p-styryl fluoro alkyl sulfimide lithium, acrylate polyether, nitrile imidazole type ionic liquid and a silane coupling agent KH-570, and performing free radical polymerization under the stirring condition and the initiation of ultraviolet light to prepare a copolymer; uniformly dispersing the copolymer and an inorganic nano material in a solvent to prepare a castingsolution; pouring the casting solution on a clean membrane-making glass mould uniformly, and transferring the membrane-making glass mould to a vacuum drying oven; and performing heating to completelyvolatilize the solvent, dehydrating, condensing and crosslinking the polymer to obtain a membranous composite single-ion solid electrolyte. The composite single-ion solid electrolyte obtained by the invention has the higher ionic conductivity and lithium ion transference number and good thermal stability and electrochemical stability, and has the excellent long-cycle performance and high-voltage resistance when used in a lithium ion battery; and moreover, the preparation method is simple and mild in condition and is capable of achieving large-scale production.
Owner:ZHEJIANG UNIV
An electrolyte containing a cathode protector and a lithium sulfur battery containing the electrolyte
InactiveCN109244472AImprove Coulombic efficiencyImprove cycle stabilityCell electrodesLi-accumulatorsBond cleavageLithium–sulfur battery
The invention discloses an electrolyte containing a positive electrode protecting agent and a lithium sulfur battery containing the electrolyte. The purpose of the positive electrode protecting agentused in the lithium sulfur battery is to solve the problems of poor cycle stability, poor discharge rate and poor safety performance existing in the prior lithium sulfur battery. The technical schemeis that a positive electrode protecting agent is added into the traditional electrolyte of the lithium-sulfur battery as the electrolyte of the lithium-sulfur battery. In the charge and discharge process of the battery, the protectant is combined with S-S bond bonding, which lowers the activation energy of S-S bond cleavage / binding, accelerates the rate of redox reaction, thus alleviating the shuttle effect of lithium polysulfide and improving the reversibility and cycling stability of active sulfur.
Owner:YANTAI UNIV
A kind of lithium metal electrode and its preparation method and application
ActiveCN111987287BReduce preferential depositionImprove stabilityMaterial nanotechnologySecondary cellsMetallic electrodeChemical physics
The invention relates to the technical field of electrode materials, in particular to a lithium metal electrode and its preparation method and application. The three-dimensional network structure in the lithium metal electrode provided by the present invention can effectively accelerate charge transfer and reduce interfacial resistance; compared with pure lithium electrodes, it has a large specific surface area, which can generate lower local current density and make the charge distribution Uniform, Li deposition will become smooth and reduce its growth rate, the Al 2 o 3 layer and Li 3 PO 4 The layer can accommodate the volume expansion during the battery cycle, reduce the preferential deposition of lithium ions, promote the uniform deposition on the surface of lithium metal, effectively suppress lithium dendrites, and improve the stability and cycle life of the battery; and the invention described The structural features of lithium metal electrodes can reduce the internal stress and interfacial fluctuations of the material, thereby improving the overall mechanical stability and integrity of the battery.
Owner:BEIJING UNIV OF TECH
A composite solid electrolyte membrane and its preparation method, solid-state battery
ActiveCN110581311BIncrease energy densityImprove cycle lifeSecondary cellsElectrolytesSolid state electrolytePolymer electrolytes
Owner:郑州宇通集团有限公司
Surface modification method of lithium secondary battery negative electrode, ag modified lithium electrode prepared by using the method and application
ActiveCN108376764BLittle impact on electrochemical performanceReduces non-Faradaic responseCell electrodesLi-accumulatorsElectrolytic agentElectrical battery
The invention discloses a lithium secondary battery cathode surface modification method, which comprises the following steps of adopting nano Ag powder as an electrolyte and tetrahydrofuran as a solvent, preparing a nano Ag tetrahydrofuran solution with the concentration being 0.8 to 1.0mg / ml in an argon glove box with H2O being less than 0.1ppm and O2 being less than 0.1ppm, heating and carryingout ultrasonic treatment for 12 to 24h, and obtaining an upper-layer turbid liquid for standby use; adopting a pretreated lithium electrode piece, dripping the turbid liquid on the surface of the lithium electrode piece, standing, after volatilizing tetrahydrofuran, placing under the pressure being 75 to 100Mpa for 20 to 30min, and obtaining the surface alloying-modified lithium electrode. Compared with the prior art, according to the surface modification method provided by the invention, a layer of robust Li-Ag alloy can be generated on a cathode surface during a charge-discharge process, non-faradaic reaction between a lithium cathode and an electrolyte is reduced, lithium dendrites are inhibited, and a cycle performance and a safety performance of a battery are improved.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Organic-inorganic composite solid electrolyte film, preparation method thereof and solid-state lithium metal battery
InactiveCN111682257AEasy to prepareImprove ionic conductivitySolid electrolytesLi-accumulatorsSolid state electrolyteMetallic lithium
The invention discloses an organic-inorganic composite solid electrolyte film and a preparation method thereof, and a solid lithium metal battery based on the solid electrolyte film. The electrolyte film takes a polymer as a matrix skeleton, the matrix skeleton is filled with an ionic liquid and an inorganic ionic conductor, and the ionic liquid contains a lithium salt. The solid electrolyte filmis obtained by adopting a solution casting method; the preparation method is simple, and the solid electrolyte film has relatively high ionic conductivity (greater than 10<-4> S cm<-1>). Under the condition of room temperature, the current density is controlled to be 0.1 mA cm <-2>, the assembled symmetrical metal lithium battery can stably circulate for 1,350 circles, and the operation time is aslong as 2,700 hours; the assembled Li|LiFePO4 battery has good cycle performance, can stably circulate for 100 circles at 1C, and has specific capacity maintained at 110mAh g <-1> or above.
Owner:NANJING UNIV OF POSTS & TELECOMM
A kind of electrolyte solution for lithium-sulfur battery
ActiveCN107845831BImprove Coulombic efficiencyImprove cycle stabilitySecondary cellsLithium–sulfur batteryPhysical chemistry
The invention relates to an electrolytic solution for a lithium-sulfur battery. The electrolytic solution comprises an electrolyte and a solvent, and is further added with a positive electrode protection agent, wherein the protection agent is one or more than two selected from N,N-carbonyldiimidazole (CDI), N,N-carbonyldiimidazolesulfamide and thiocarbonyldiimidazole, and the addition amount of the positive electrode protection agent is 0.1-5% of the mass of the active substance contained in the positive electrode of a lithium-sulfur battery. Compared to the electrolytic solution in the priorart, the electrolytic solution of the present invention has the following characteristics that the solvent contains the positive electrode protection agent (containing -N bond / -S bond), such that thedissolved sulfur or polysulfide can be effectively adsorbed, the shuttle effect in the lithium-sulfur battery can be inhibited, and the coulombic efficiency of the battery can be improved so as to improve the cycle stability of the battery.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Preparation method and application of lithium/lithiated metal oxide frame composite negative electrode
ActiveCN111987290BFast transmissionUniform fluxSecondary cellsNegative electrodesSolid state electrolyteMetallic lithium
The invention discloses a preparation method and application of a negative electrode with a lithium / lithiated metal oxide frame composite structure. The method is as follows: 1. x , conductive carbon and PVDF are mixed and evenly coated on the current collector, and after vacuum drying, MO x Pole piece; 2. Using metal lithium sheet as negative electrode, MO x The pole piece is used as the counter electrode, the battery is assembled, the constant current discharge is performed, the cut-off voltage is controlled, and the Li y MO x Electrode frame; three, the Li y MO x The electrode frame is mixed with molten lithium to obtain a composite structure negative electrode, and a solid-state electrolyte is used to assemble an all-solid-state battery. In the present invention, the embedded transition metal oxide MO x As a carrier, Li with fast ion transport properties is formed after lithium intercalation y MO x Electrode frame, and then uniformly deposit metallic lithium inside the frame, thereby inhibiting the growth of lithium dendrites and avoiding safety accidents.
Owner:HARBIN INST OF TECH
Solid-state polymer electrolyte, solid-state battery comprising same and preparation method of solid-state battery
PendingCN111540947AImprove antioxidant capacityWide electrochemical windowFinal product manufactureElectrolyte accumulators manufactureElectrolytic agentPolyethylene glycol
Disclosed is a solid polymer electrolyte comprising an amorphous polymer, the amorphous polymer is of a comb-like structure formed by copolymerizing monomer units; the monomer unit comprises a monomerunit with a polar group and a polyethylene glycol acrylate monomer unit. The invention also discloses a solid-state battery containing the solid-state polymer electrolyte and a preparation method ofthe solid-state battery. According to the solid polymer electrolyte disclosed by the invention, the amorphous polymer can improve the conduction speed of lithium ions and greatly improve the conductivity of the lithium ions. The high-dielectric structural unit (polar group) contained in the solid polymer electrolyte greatly enhances the oxidation resistance of the polymer electrolyte, widens the electrochemical window of the polymer electrolyte, and promotes the enhancement of chemical stability and electrochemical stability. Meanwhile, lithium dendrites can be inhibited, and oxygenolysis of the electrolyte is inhibited. The in-situ copolymerization of the solid polymer electrolyte and the high-dielectric structure unit can improve the interface performance of the electrode and the electrolyte.
Owner:CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
Five-block polymer, preparation method and application thereof, and five-block polymer electrolyte
PendingCN114551995AGood film formingImprove thermal stabilitySolid electrolytesFinal product manufacturePolymer electrolytesPolymer science
The invention provides a five-block polymer, a preparation method and application thereof, and a five-block polymer electrolyte, and belongs to the technical field of polymer electrolytes. The five-block polymer provided by the invention contains a polypropylene oxide (PPO) block, so that ordered arrangement of the polyethylene oxide (PEO) block can be disrupted, and the crystallinity of the PEO block is reduced; meanwhile, the styrene block can inhibit lithium dendrites and improve the mechanical strength of the polymer electrolyte. Meanwhile, the five-block polymer provided by the invention also has the advantages of good film-forming property and high thermal stability. The result of the embodiment shows that when the penta-block polymer provided by the invention is used as the electrolyte of the lithium ion battery, the conductivity at 70 DEG C is 2.87 * 10 <-4 > S / cm, and the penta-block polymer has excellent rate capability; and the lithium ion transference number can reach 0.31 and is higher than 0.2 of the pure polyoxyethylene-based polymer electrolyte.
Owner:吉林省东驰新能源科技有限公司
Lithium-free dendrite anode with carbon nanotube film directly compounded with molten lithium metal and preparation method thereof
ActiveCN111900333BIncrease in sizeReduce energy densityMaterial nanotechnologyElectrode carriers/collectorsFree energiesPhysical chemistry
Owner:JIANGXI UNIV OF SCI & TECH
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