93results about How to "Improves ion transmission" patented technology

The invention discloses a preparation method of a poly-dopamine modified lithium-ion battery diaphragm. According to the modification way, a membrane is formed by polymerizing dopamine monomer on the surface of a macromolecule matrix and in the macromolecule matrix. The modified diaphragm prepared by using the method has the advantages of high liquid absorption / retention capability, prominent rate capability and the like; and the lithium-ion battery with the diaphragm has the advantages of high electrolyte ionic conductivity, high battery cycle performance and the like, and is particularly applied to the field of power lithium ion batteries.

The invention relates to a micro-nano-structure anode material for a Li-air battery and a preparation method of the micro-nano-structure anode material. The preparation method comprises the following steps of: preparation of hollow composite precursor fibers through electrostatic spinning by blending a metal nitride catalyst precursor with a high-carbon polymer in an organic solvent, preprocessing of the precursor fiber material, nitridation of complex fibers, and pore-forming and pore-expansion through activation. The preparation method is simple in technique and convenient to operate and is easy to realize the uniform distribution of nanoscale catalyst particles in hollow carbon fibers. A prepared anode material tube is hollow internally, a plurality of holes are formed on the wall of the tube, and metal nitride catalysts are uniformly distributed in the three-dimensional holes of the wall of the tube, so that high specific surface area provides a sufficient place for the reaction of the battery, and the hollow pore passage in the tube can ensure an oxygen diffusion channel to be smooth and has good ion transport capacity and electrical conductivity. According to the invention, the charge-discharge capacity of the Li-air battery can be improved effectively, the power multiplying performance and the power density of the Li-air battery can be improved, the internal resistance of the battery can be reduced, and the charge-discharge polarization can be lessened through the uniform distribution of the nanoscale metal nitride, therefore, the micro-nano-structure anode material has good industrialization prospect.

The invention discloses three-dimensional functionalized graphene for supercapacitors and a preparation method of the three-dimensional functionalized graphene. Natural graphite powder is used as a raw material for preparing graphite oxide, hydrochloric acid assists in ultrasonic stripping so that oxidized graphene can be prepared, and the three-dimensional functionalized graphene is obtained through controllable thermal reduction. The three-dimensional functionalized graphene prepared through the method is of a controllable multistage mutual through hole structure and has functionalized surface functional groups. The three-dimensional functionalized graphene is made into electrodes suitable for the supercapacitors, the specific capacitance value of the electrodes in a water-based electrolytic solution reaches 508 F / g, energy densities of the supercapacitors are 15 Wh / kg and 66 Wh / kg, and corresponding power densities of the supercapacitors are 14 kW / kg and 52 kW / kg in a water-based electrolytic solution system and an ionic liquid-based electrolytic solution system. When the power density of the ionic liquid-based electrolytic solution system is 128 kW / kg, the corresponding energy density still keeps 56 Wh / kg accounting for 85% that of an initial value.

The invention discloses a porous three-element compound positive plate. The porous three-element compound positive plate is characterized by being prepared from the following materials of a three-element main material, a conducting agent, a binding agent, a fast ionic conductor, lithium salt and a pore forming agent. According to mass fraction of all the materials, the three-element main materialis 80 to 90 parts, the conducting agent is 1 to 5 parts, the binding agent is 2 to 5 parts, the fast ionic conductor is 2 to 15 parts, the lithium salt is 3 to 10 parts, and the pore forming agent is2 to 5 parts. The porous three-element compound positive plate has the advantages that in the porous three-element compound positive plate disclosed by the invention, solid electrolyte is poured intoa pole plate, so that electrode / electrolyte interface compatibility is improved, ion transmission capacity in the pole plate is enhanced, and whole electrochemical performance of a cell is improved. The porous three-element compound plate disclosed by the invention can be applied to the field of solid cells and has large-scale batch production possibility.

A solid electrolyte contains an internal component and an external component coated on a surface of the internal component. The internal component is represented by a formula Li1+xMxZr2-x(PO4)3, M is one or more elements selected from a group consisting of Al, La, Cr, Ga, Y, and In, and 0.05≤x≤0.4. The external component contains a plastic deformable material and has a conductivity of about 10-7 S / cm to about 10-5 S / cm. A method of preparing the solid electrolyte and a lithium ion battery including the solid electrolyte are also provided.

A mass spectrometer comprising: a pulsed ion source for generating pulses of ions having a range of masses; a time-of-flight mass analyzer for receiving and mass analyzing the pulses of ions from the ion source; and an energy controlling electrode assembly located between the pulsed ion source and the time-of-flight mass analyzer configured to receive the pulses of ions from the pulsed ion source and apply a time-dependent potential to the ions thereby to control the energy of the ions depending on their m / z before they reach the time-of-flight mass analyzer. Mass dependent differences in average energy of ions can be reduced for injection into a time-of-flight mass analyzer, which can improve ion transmission and / or instrument resolving power.

The invention relates to a lithium metal negative electrode with a double-layer interface film, preparation of the lithium metal negative electrode, and application. The double-layer interface film isattached to the surface of lithium metal; the inner layer of the double-layer interface film is a lithium fluoride inorganic layer; the outer layer of the double-layer interface film is an ether polymer layer. When the interface film is applied to a lithium metal battery, the inner-layer compact film of the interface film can inhibit dendrite growth on the surface of lithium metal, the outer-layer flexible film of the interface film can effectively relieve the breakage of the lithium fluoride layer caused by the volume expansion of a negative electrode, and therefore, interface stability is improved, continuous reaction and consumption of the lithium negative electrode and an electrolyte are inhibited, and the cycle life of the battery is prolonged. In addition, due to the introduction oforganic lithium salt into the interface film, interface lithium ion transmission is greatly accelerated, and lithium deposition uniformity is improved.

The invention discloses a composite porous membrane liquid flow battery and its application in preparation of liquid flow in a battery, by one or more than two kinds of as prepared porous membrane organic polymer resin or sulfonated polymer resin as matrix, respectively on two sides of the matrix composite Yang, anionic organic resin to form a composite porous membrane.

The invention discloses a solid-state ionic gel polymer electrolyte and a preparation method thereof. The preparation method of the solid-state ionic gel polymer electrolyte comprises a step of performing mixing and infiltration on ionic liquid dissolved with lithium salt and an inorganic / organic hybrid material having a three-dimensional network structure so as to form a solid-state ionic gel compound material. While the solid-state ionic gel compound material is used as the electrolyte, the mechanical performance and the ion transmission capability of the polymer electrolyte can be ensured at the same time. The solid-state ionic gel polymer electrolyte disclosed by the invention shows better flexibility and mechanical performance, and has higher safety performance. Due to cooperative application of the electrolyte and proper positive pole, positive pole active substances is enabled to have higher specific volume and have excellent application prospect.

The invention aims to provide a preparation method of a metal and metal oxide quantum dot-mesopore carbon nanometer composite material with excellent capacity and cycle properties. The method comprises the steps of preparing an impregnation liquid by taking a metal M salt as a solute and absolute ethyl alcohol and distilled water as a solvent; taking plant with high loose characteristic as a carbon source; immersing straw particles in the impregnation liquid; and performing drying, roasting and grinding to prepare the composite material. The method is simple in process and low in cost, the grain sizes of quantum dots are about 2-10 nanometers, the quantum dots are uniformly distributed, and high reproducibility is achieved; and the prepared metal and metal oxide quantum dot / mesopore carbon nanometer composite material shows excellent capacity and cycle property when used for a supercapacitor electrode material and also shows favorable catalytic performance when used for catalytic oxidation of methanol.

The invention discloses a composite diaphragm comprising PVDF coating with a lamellar structure and a preparation method thereof, and application of a composite diaphragm comprising PVDF coating witha lamellar structure. The composite diaphragm comprises a porous basal membrane containing holes and coating at the surfaces of one side or two sides of the porous basal membrane; the coating comprises a PVDF with a lamellar structure. The addition of the PVDF with the lamellar structure in the coating effectively increases the contact area of the PVDF and the porous base membrane, the effect of well bonding with the membrane base layer is achieved while the content of the binder in the coating is reduced; the PVDF coating with the lamellar structure is employed to obviously reduce the contentof the binder in the coating, the air permeability of the composite diaphragm is less influenced by the coating, the prepared composite diaphragm has better air permeability, and a battery adopting the composite diaphragm has good circulation and rate capability; the PVDF with the lamellar structure can form a loose stacking structure, the porosity of the coating is improved, and the transmissionof lithium ions is facilitated. The preparation method is simple and easy to implement and is suitable for large-scale industrial production.

The invention relates to a method for preparing high-stability nanometer black phosphorus / three-dimensional graphene composite materials, and belongs to the technical field of composite materials. Themethod includes mixing nanometer black phosphorus dispersion liquid and graphene oxide dispersion liquid with each other under inert gas atmosphere conditions at the temperatures of 5-30 DEG C and carrying out ultrasonic treatment to obtain dispersion liquid A; treating the dispersion liquid A by the aid of liquid nitrogen under inert gas atmosphere conditions and carrying out freeze drying to obtain the high-stability nanometer black phosphorus / three-dimensional graphene composite materials. The method has the advantages that graphene oxide can be reduced under ultrasonic conditions under catalytic effects of nanometer black phosphorus to obtain graphene, and excellent bonding effects can be realized by black phosphorene and the graphene in reduction procedures.

The invention relates to an interfacial modification membrane for a solid electrolyte for a lithium battery and a preparation method thereof. The interfacial modification membrane for the solid electrolyte for the lithium battery is characterized in that a layer of interfacial modification membrane is attached to one face or both faces of a solid electrolyte. The preparation method of the interfacial modification membrane comprises the following steps of: (1) selecting a fast-ionic conductor or a uniform mixture of a lithium-ion active material and water; (2) forming a target material by compressing the fast-ionic conductor or the uniform mixture, sintering the target material for 3-24 hours at the temperature of 500-1200 DEG C, and then, carrying out natural cooling with a furnace; and (3) attaching the target material to the face or the both faces of the solid electrolyte through magnetron sputtering, laser evaporation or electron beam evaporation, thereby obtaining the interfacial modification membrane for the solid electrolyte. According to the interfacial modification membrane for the solid electrolyte for the lithium battery and the preparation method thereof, as the layer of interfacial modification membrane is attached to the face / faces of the solid electrolyte playing a diaphragm role, the interfacial impedance between the solid electrolyte and an electrolytic solution and other types of electrolytes is reduced, the ion transmission capacity of an interface layer of the solid electrolyte is improved, and the discharge performance of the battery is effectively improved; and the preparation method is simple, and the large-scale production is facilitated.

The invention discloses a lithium-sulfur battery separator membrane as well as a preparation method and application thereof, and belongs to the technical field of battery separator membranes. The lithium-sulfur battery separator membrane comprises a base membrane and a functional layer with which the base membrane is coated, wherein the functional layer comprises a functional material and an auxiliary agent, and the functional material comprises a layered sulfide, a conductive carbon material and nano cellulose. By adopting the technical scheme provided by the invention, the shuttle effect caused by lithium polysulfide in the cycle process of the lithium-sulfur battery can be effectively inhibited, and the capacity retention ratio, the electronic conductivity and the cycle effect of the lithium-sulfur battery are improved.

The invention discloses a modified high-voltage positive electrode material as well as a preparation method and application thereof. The modified high-voltage positive electrode material comprises a high-voltage positive electrode material core and a conductive polymer shell layer coating the surface of the high-voltage positive electrode material core, the preparation method comprises the following steps: carrying out in-situ reaction by adopting a high-voltage positive electrode material, a conductive polymer monomer, a catalyst and an initiator or carrying out direct coating by adopting thehigh-voltage positive electrode material, a conductive polymer and a coupling agent. The modified high-voltage positive electrode material can gradually react with an electrolyte in a battery througha controllable electrochemical activation process to form a new surface compact coating layer, the surface impedance of the battery can be effectively reduced, the ion transmission performance is improved, the rate capability of the material is improved, and the preparation method is simple to operate, high in controllability, non-toxic, harmless, few in by-product and suitable for industrial production.

The present invention provides a negative electrode comprising solid electrolyte and low porosity. The negative electrode comprises: an anode active material, a solid electrolyte, a conductive agent,and a binder, and a preparation method thereof comprises: dividing the anode active material and the solid electrolyte into at least three grades according to particle size; then carrying out mixing according to a certain ratio to achieve particle size distribution; mixing the material obtained by particle size distribution with the conductive agent, the binder and an organic solvent according toa certain ratio, stirring uniformly, smearing and drying; and pressing a dried pole piece at room temperature and suppressing the pole piece into a usable electrode. According to the invention, the solid electrolyte is added to the negative electrode pole piece, the solid electrolyte participates in the distribution of the anode material, the low-porosity electrode is prepared by cold pressing, and a lithium ion channel is provided for the low-porosity negative electrode, so the energy density of the lithium battery can be improved and the use amount of electrolyte is reduced.

The invention discloses a mixed matrix cation exchange membrane based on a metal organic framework compound and a preparation method of the mixed matrix cation exchange membrane, and belongs to the technical field of membrane separation. According to the mixed matrix cation exchange membrane, sulfonated polyethersulfone is used as a membrane matrix material, hydrophilic MIL-101, UIO-66, ZIF-8, modified chitosan, sodium alginate and chitin are used as additive substances, and finally the mixed matrix cation exchange membrane is obtained through a blending method. The invention provides a simplefilm membrane method. The obtained mixed matrix cation exchange membrane has improved porosity and good hydrophilicity, the addition of the organic metal framework compound improves the ion exchangeperformance of the membrane, reduces the membrane resistance and improves the anti-pollution performance of the membrane, and the sulfonated polyethersulfone is used as the matrix to enhance the mechanical strength, ion exchange performance and thermal stability of the membrane.

The invention discloses a hollow MXenes-based metal oxide composite material. The hollow MXenes-based metal oxide composite material comprises the following components: V2CTx MXenes, reduced grapheneoxide and metal oxide. The V2CTx MXenes are obtained by treating a substrate material with an etching agent, a layer expanding agent and an ionic liquid. The reduced graphene oxide is used as an intermediate layer material and has the effects of connecting, inhibiting stacking and inducing growth. The morphology of the metal oxide NiMoO4 is of a petal wrinkle-shaped structure, and pseudocapacitance is provided. The microstructure of the composite material has a carbon shell 'embedded' hollow structure. The key technology of the preparation method is as follows: the microstructure is regulatedand controlled by adopting a non-constant centrifugal condition and an ionic liquid. When the material is used as a supercapacitor, the supercapacitor is charged and discharged in a range of-0.2 V to0.35 V, and when the discharge current density is 1 A / g, the specific capacitance is 1000-1100 F / g. The specific capacitance performance can still reach 88-89% of the original specific capacitance performance after 3000 cycles under the current density of 10 A / g. And excellent electrochemical characteristics and chemical stability are achieved.

The invention provides an electrolyte solution, a calcium ion secondary battery and a preparation method of the calcium ion secondary battery, and relates to the field of batteries. The electrolyte solution comprises an electrolyte and a non-aqueous solvent, wherein the electrolyte comprises calcium salt and non-calcium salt; the non-calcium salt comprises any one or a combination of at least twoof lithium salt, sodium salt and potassium salt; more than two different cations corresponding to calcium salt and non-calcium salt are hybridized to enable the electrolyte solution to have high ionicconductivity, the solvation effect can be weakened, the self-discharge phenomenon of the battery can be reduced when the electrolyte solution is applied to the calcium ion secondary battery, a good solid electrolyte interface film is facilitated to be formed at the same time, and the energy density and the cycle performance of the battery can be improved. The invention further provides a calciumion secondary battery comprising the electrolyte solution. In view of the advantages of the electrolyte solution, the calcium ion secondary battery has excellent energy density and cycle performance.The invention also provides a preparation method of the calcium ion secondary battery. The preparation method is simple and stable.

The invention discloses a delayed ion extraction module applicable to a time-of-flight mass spectrometer. The delayed ion extraction module comprises a signal capturing circuit for receiving a synchronous signal of a laser device; an output end of the signal capturing circuit is connected with a signal input end of a signal widening circuit; the output end of the signal widening circuit is connected with the signal input end of a signal delaying circuit; and the output end of the signal delaying circuit is composed of a first triggering signal output end and a second triggering signal output end. The delayed ion extraction module has the advantages that the circuit design is ingenious; when the synchronous signal of the laser device is accurately captured in real time, the synchronous signal with the pulse width of 5ns is widened into standard square wave pulse of 7us; and the intrinsic delay of a circuit is only 38ns, and can be adjusted in a delaying time range of 50-1200ns, so that the requirements on triggering signals of a high-speed acquisition card and a high-voltage pulse module are met. The ion transmission capability is improved to the greatest extent, and the sensitivity and the resolution ratio of a mass spectrum system are effectively improved; and the manufacturing cost can be reduced very well.

As a new type of energy storage element, supercapacitors have the advantages of higher power, faster charging and discharging, longer life and lower maintenance costs compared with traditional physical capacitors and batteries, among which excellent electrode materials are the core. The invention provides a method for preparing an activated carbon / cobalt hydroxide composite electrode material. The activated carbon prepared by using ginkgo biloba biomass resources has larger pores and better specific surface area utilization, thereby increasing the electrochemical performance of cobalt hydroxide , to increase its rate performance and make it have better cycle stability.

The invention discloses a lithium-sulfur diaphragm with a synergistic effect mechanism, a preparation method of the lithium-sulfur diaphragm and a lithium-sulfur battery, and belongs to the technicalfield of battery diaphragms. According to the invention, the porous conductive carbon material is added into the positive electrode side functional layer; a nano oxide material is added into the negative electrode side functional layer; the positive side and the negative side on the two sides of the diaphragm base membrane are coated with the functional layer slurry to prepare the lithium-sulfur diaphragm with a synergistic effect mechanism. The prepared lithium-sulfur diaphragm is applied to the lithium-sulfur battery, so that the shuttle effect caused by lithium polysulfide in the cycle process of the lithium-sulfur battery can be effectively inhibited, the deposition of lithium sulfide on the surface of an electrode can be reduced, lithium dendrites are prevented from piercing a pole piece, and the capacity retention ratio and the cycle effect of the lithium-sulfur battery are improved.

The invention discloses a high-frequency response porous PEDOT: 1. PSS thin-film material. The preparation method is based on a high-molecular polymer PEDOT / PSS (poly 3, 4-ethylenedioxythiophene / polystyrene sulfonate). The preparation method comprises the following steps of: adding a polar cosolvent DMSO (dimethyl sulfoxide) into a PEDOT / PSS aqueous solution; uniformly stirring, spin-coating filter paper with the mixed solution, putting the PEDOT: PSS thin film material into a drying oven, drying at 80 DEG C for 10 minutes, treating with concentrated sulfuric acid at room temperature for 12-24hours, washing with deionized water, and finally drying to obtain the high-frequency response porous PEDOT: PSS thin-film material. The supercapacitor prepared from the high-frequency response porousPEDOT: PSS thin-film material has the advantages of high energy density, small internal resistance and good high-frequency responsiveness.

A method for preparing a silicon-carbon negative electrode material based on micron silicon dioxide, which comprises the following steps of: 1) preparing a slurry according to the mass ratio of silicon dioxide: carbon source: water=(30-80) : (5-15) : (60-120), wet grinding for 4-5h, freeze-drying to obtain nano-scale silicon dioxide; 2) carbonizing the obtained product of 1) at high temperature toobtain a silicon dioxide-carbon material, and then carrying out magnesium thermal reduction at 600-750 DEG C according to the mass ratio of silicon dioxide-carbon: Mg: NaCl=1:1:1-1:1:10, pickling, washing and drying to obtain the silicon-carbon nanoparticles; 3) ultrasonically mixing the nano particles of 2) with graphene oxide solution, spraying, thermal cracking and coating and reducing to obtain the material. The method has the advantages of low cost, simple operation and uneasy agglomeration, can maintain the original appearance of the sample, has good structural stability of the product,and has strong electrical conductivity and ion transmission capacity of the material.

The invention belongs to the technical field of solid electrolytes, and particularly relates to a composite solid electrolyte and a preparation method thereof. The method comprises the steps: enablingpolyether glycol, 2, 6-toluene diisocyanate, a catalyst and a chain extender to be mixed and react to obtain a polyurethane prepolymer; in an inert gas atmosphere, dispersing a lithium salt and an inorganic solid electrolyte into 1, 3-dioxolane, adding an initiator and a plasticizer, and performing uniform dispersing to obtain a precursor solution; and adding the precursor solution into the polyurethane prepolymer, performing stirring and mixing uniformly, performing standing, performing heating to 70-75 DEG C, and keeping the temperature for 6-8 hours to obtain the composite solid electrolyte. According to the invention, the 1, 3-dioxolane takes the lithium salt additive as a ring-opening initiator, the coating of the inorganic solid electrolyte is performed in the ring-opening polymerization process, and a mutually doped networked polymer with a polyurethane system is formed, so the formed networked porous structure has a rich ion transport network, and the ion transport property and the electron conductivity are improved.

The invention provides a bimetallic selenide carbon microsphere composite material as well as a preparation method and application thereof. In the bimetallic selenide carbon microsphere composite material, two kinds of metal selenide are cross-linked with each other through the carbon matrix and are uniformly combined to form microspheres; in the two kinds of metal selenide, the metal valence state of one is relatively high, and the metal valence state of the other is relatively low. By introducing the high-valence metal, the electron and ion transmission effect of the low-valence metal can be improved, and the synergistic effect of the double metals is generated, so that the activity and the sodium storage performance of the material are improved. The carbon matrix not only provides a conductive network, but also limits the volume expansion of the material.

The invention relates to the field of lithium ion battery separators, in particular to a lithium ion battery diaphragm with a thermal closing function and a preparation method and application thereof,the diaphragm provided by the invention is a porous network crosslinking structure, comprises 40-50wt% of modified polypropylene fiber and 50-60wt% of cellulose fiber, The modified polypropylene fiber is prepared by sequentially oxidizing the polypropylene fiber and coating. The crosslinking structure is introduced into the diaphragm through in-situ micro-melting technology, the pore structure ofthe diaphragm can be improved, the mechanical strength of the diaphragm can be increased, and the thermal stability and safety performance of the diaphragm are also ensured.

The invention belongs to the field of differential ion mobility spectrum, in particular to a differential ion mobility spectrum of a micro-ionization spray ion source and an application method thereof, wherein the mobility spectrum is sequentially arranged as an ion source atomization chamber, an auxiliary gas accumulation chamber and a differential ion mobility spectrum device. The invention adopts the auxiliary atomizing gas to improve the ionization efficiency of the ion source, the auxiliary atomizing gas and the auxiliary gathering gas are combined to reduce the ion diffusion between theion source and the DMS, and the streamlined gas flow also greatly improves the ion transmission rate in the differential ion mobility spectrum migration channel. The design of double gas paths reducesthe disturbance of gas flow when the two gas streams converge, avoids the uneven gas flow rate caused by the instability of mass spectrometer pump in the traditional technology, and ultimately achieves relatively high ion transport efficiency.

The invention discloses a preparation method for hollow graphite carbon ball / manganese dioxide nano-fiber composite material suitable for super-capacitor material. The hollow graphite carbon ball / manganese dioxide nano-fiber composite material is prepared through growing manganese dioxide nano-fiber on a hollow graphite carbon ball by means of the interaction between the hollow graphite carbon ball and potassium permanganate. The preparation method for the hollow graphite carbon ball / manganese dioxide nano-fiber composite material is easy to operate, and the prepared hollow graphite carbon ball / manganese dioxide nano-fiber composite material has high ion transmission performance and is suitable for the super-capacitor material.