44results about How to "High lithium ion conductivity" patented technology

The invention relates to a lithium ion solid electrolyte and a preparation method application thereof, and belongs to the technical field of a lithium ion battery. The lithium ion solid electrolyte has the chemical formula shown as follows: Li<3+a>M

A<m>B<n>Y<1-b>, wherein a is more than or equal to -0.25 but less than or equal to 0.25, b is more than or equal to 0 but less than or equal to 0.5, m is more than or equal to 0 but less than or equal to 1.25, n is more than or equal to 0 but less than or equal to 1.25, M is one of Ca, Ba, Mg, Al and Ti, A and B are separately selected from one of O, S, Se, Te, N, P, Si, C, Sb, Bi, F, Cl, Br and I, and Y is one of halogen, minus monovalent ionic group or vacancy. The lithium ion solid electrolyte has a stable structure and favorable lithium ion transmission performance and has favorable electrochemical performance and safety performance when used as a solid electrolyte of the lithium ion battery.

The invention discloses a method for preparing a high-performance lithium phosphate/carbon-coated lithium iron phosphate composite material. The method mainly comprises the processes of preparing lithium iron phosphate not subjected to carbon coating and preparing the lithium phosphate/carbon-coated lithium iron phosphate composite material. The method comprises the following steps: performing primary sintering to prepare lithium iron phosphate not subjected to carbon coating, and adding a certain amount of lithium phosphate and carbon source in the secondary mixing process to finally prepare the lithium phosphate/carbon-coated lithium iron phosphate composite material. The lithium phosphate is a fast ionic conductor, the aim of improving the electrical conductivity of lithium iron phosphate is achieved, and the aim of improving the overall performance of the lithium iron phosphate is also achieved.

The invention discloses an organic/inorganic composite electrolyte and a preparation method thereof. The organic/inorganic composite electrolyte is obtained by dispersing a lithium salt and a modified inorganic solid electrolyte into a polymer in a mixing manner, wherein the polymer contains an ethylene oxide repeating unit. The modification of the inorganic solid electrolyte is carried out for the first time; a polymer electrolyte and the inorganic electrolyte are effectively and evenly composited, so that the organic/inorganic composite electrolyte material is obtained. The dispersion of the inorganic solid electrolyte in the polymer is improved by the modification of the inorganic solid electrolyte, so that the adverse effect that the inorganic solid electrolyte is automatically gathered is avoided. The organic/inorganic composite electrolyte material obtained according to the preparation method has the advantages of the polymer electrolyte and the inorganic electrolyte, so that the comprehensive performance of the organic/inorganic composite electrolyte material is obviously improved. The organic/inorganic composite electrolyte material has practical value and can be popularized in lithium ion secondary batteries.

The invention provides an electric field activated sintering method of a solid electrolyte material Li7La3Zr2O12 (LLZO). The electric field activated sintering method comprises the following specific steps: ball-milling with a ball and mixing Li2O, La2O3 and ZrO2 powder, the mass percents of which are respectively 9.2-15.5%, 56.2-60.4% and 28.3-30.4%, wherein a zirconium oxide ball is used as a ball-milling medium, isopropanol is used as a solvent, and the ball-milling time is 12-36 hours; carrying out vacuum drying on ball-milling milled powder for 6-12 hours at the temperature of 80 DEG C; and carrying out electric field activated sintering, wherein the temperature is in the range from 800 to 1230 DEG C, the pressure is 0-100 MpaMPa, and a sintered sample has the room-temperature lithium-ion conductivity greater than 6*10<-4S>S/cm. Compared with a conventional solid-phase synthesis method, the electric field activated sintering method has the advantages that the synthesis reaction and the sintering compact process are completed in one step, the synthetic efficiency is improved to a large extent, the preparation technology is simplified, and the LLZO with the high lithium-ion conductivity is obtained.

The invention relates to a lithium phosphate coated lithium iron phosphate electrode and a preparation method thereof, belonging to the technical field of electrode materials for lithium secondary batteries. The surface of the lithium iron phosphate electrode is coated with nanoscale glassy state lithium phosphate. The electrode preparation method comprises the following steps of: mixing lithium phosphate powder and an organic solvent, carrying out ball-milling on the mixture to form pulp, drying the pulp to obtain powder, compacting the powder into a lithium phosphate target precursor, and then calcining to obtain a lithium phosphate target; carrying out magnetron sputtering on lithium iron phosphate electrode (serving as substrate) and the lithium phosphate target to obtain the lithium phosphate coated lithium iron phosphate electrode, wherein the distance between the target and the substrate is 4-8cm, and the background intensity of pressure is less than or equal to 10*10<-5>Pa. The electrode has high lithium-ion conductivity, and also the capacity of the electrode is improved; the coated lithium phosphate has good chemistry and electrochemical stability and can be used for protecting the stability of the electrode structure; the preparation method is simple and low in cost; and the large-scale production is easy to realize.

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium salt and a functional additive, and the functional additive comprises pentafluorophenyl vinyl sulfonate, 3-trifluoromethyl-5-methoxybenzonitrile and lithium difluorophosphate. When the electrolyte disclosed by the invention is applied to the lithium ion battery of a nickel-cobalt-manganese ternary material/graphite system, the high-voltage resistance of the lithium ion battery is improved, and the rate capability, the normal-temperature cycle, thehigh-temperature cycle and the high-temperature storage performance of the lithium ion battery are remarkably improved.

The invention relates to a solid electrolyte material. The chemical composition of the solid electrolyte material is LixSiyRezSmOn, wherein x is larger than or equal to 2 and smaller than or equal to3, y is larger than or equal to 0.5 and smaller than or equal to 2, z is larger than or equal to 0.3 and smaller than or equal to 0.6, (m+n) is larger than (x+4y+3z)/2.1 and smaller than or equal to (x+4y+3Z)/1.8, and Re is selected from rare earth elements Y, Gd, Gy or Sm. The solid electrolyte material is high in lithium ion conductivity, high in electron conductivity, wide in electrochemical window and high in temperature resistance. The invention further relates to a solid electrochromic device. An electrolyte is selected from the solid electrolyte material, an electrochromic layer is selected from at least one of tungsten oxide, bismuth trioxide, molybdenum trioxide or nickel oxide, and an ion storage layer is selected from at least one of lithium-embedded vanadium pentoxide, lithium-embedded titanium dioxide, lithium-embedded tungsten trioxide or lithium-embedded nickel oxide. The solid electrochromic device has the advantages of being short in color change response time and stable in performance.

The invention discloses a quasi-solid-state lithium battery and a preparation method thereof. The quasi-solid-state lithium battery comprises a negative electrode, a positive electrode and a diaphragm, and also comprises a quasi-solid-state electrolyte dispersed among the surfaces of the negative electrode, the positive electrode and the diaphragm and gaps among the negative electrode, the positive electrode and the diaphragm. The quasi-solid-state electrolyte comprises a polymer phase, and a ceramic electrolyte, a lithium salt and a flame-retardant organic solvent which are dispersed in the polymer phase, wherein the polymer phase is formed by in-situ polymerization of composite acrylate monomers; and the composite acrylate monomer comprises a star-shaped acrylate monomer and a chain-shaped acrylate monomer. According to the quasi-solid-state lithium battery disclosed by the invention, the problem that the safety of the battery is reduced by liquid electrolyte is solved, and the problem that the cycle performance of the battery is reduced due to dissolution of solid polymer electrolyte is also avoided. Therefore, the quasi-solid-state lithium battery has excellent safety performance, high conductivity and excellent cycling stability.

The invention relates to a preparation method of a high-performance lithium ion conduction membrane. The preparation method is characterized by comprising the following steps: preparing a spinning solution; dissolving commercialized Li10GeP2S12 powder with the granularity of 20nm to 200nm and organic macromolecules with certain viscosity according to the mass ratio of mLi10GeP2S12 to m macromolecules of 1 to (1-10) in an organic solvent, and adequately stirring to form turbid liquid with solid content of 30 to 95 percent; and carrying out electrostatic spinning on the mixture, and thermally rolling an electrostatic spun diaphragm through a roller-type hot press at the temperature of 60 to 85 DEG C to obtain the diaphragm with high ion conductivity. The composite diaphragm is high in safety and high in lithium ion conductivity. A lithium ion battery utilizing the diaphragm is excellent in electrochemical performance.

The invention provides a porous film. The porous film includes a base material and a coating layer, and raw materials of the coating layer include para-aramid, meta-aramid, and polyhalogenated compounds. The porous film obtained by the invention is provided with good air permeability, high temperature resistance and lithium ion conductivity, and the lithium battery obtained by using the porous film of the invention has good safety, cycle life and rate performance.

The invention provides a lithium titanium aluminum phosphate solid electrolyte material and a preparation method thereof. The preparation method specifically comprises the steps that 1, soluble aluminum salt and a precipitator are mixed and dissolved in water according to the molar ratio of 1: (1.5-2), and a mixed solution is obtained; the mixed solution is placed into a reaction kettle for heating, and a product is subjected to filtering, washing and drying to obtain an AlOOH precursor; (2) the AlOOH precursor obtained in the step (1) is mixed with lithium salt, titanium salt and phosphorus salt; Li, Al, Ti and P are mixed according to a molar ratio of (1+x): x: (2-x): 3, an ethanol medium is added, ball milling is performed, and presintering and secondary molding sintering are carried out in a dry air atmosphere to obtain the lithium titanium aluminum phosphate solid electrolyte material. The method is simple in process, low in synthesis temperature and easy to implement industrially, and the prepared lithium titanium aluminum phosphate solid electrolyte material is high in purity, good in density and high in lithium ion conductivity.

The invention relates to an additive for preventing thermal runaway and an application of the additive in a secondary lithium metal battery. A chain end of the additive contains unsaturated double bonds and a lithium metal negative electrode interface film-forming or flame-retardant structure, and a stable SEI layer can be formed on the surface of a lithium metal negative electrode in the batterycycle process, so that, on one hand, contact of the lithium metal negative electrode and an electrolyte is improved and the lithium metal battery assembled by the lithium metal negative electrode andthe electrolyte has excellent long cycle performance; and on the other hand, the unsaturated double bonds of the additive can absorb heat to be polymerized when the battery is overheated, and the unsaturated double bonds and the contained flame-retardant group play roles in blocking combustion and preventing thermal runaway of the battery. The invention further provides an application of the additive in the lithium metal battery.

The invention relates to polymer electrolyte of a lithium ion battery and a preparation method thereof. The preparation method comprises the steps of coating ion liquid with a lithium conducting polymer to form microcapsule-shaped micro particles with high lithium ion conductivity, dispersing the microcapsule-shaped micro particles into a solvent, adding lithium salt and a substrate material, and curing through coagulation bath to prepare a polymer electrolyte membrane of the lithium battery. The polymer electrolyte not only has the advantages of high ion conductivity, no liquid leakage in the application process and good mechanical property, but also is simple in preparation method, low in production cost, suitable for industrialized production and wide in application range.

The invention relates to a gel polymer electrolyte for a lithium-air battery and a preparation method thereof. The electrolyte is composed of perfluocarbon polymer electrolyte base materials with lithium ions and an electrolyte solution, wherein the perfluocarbon polymer electrolyte base materials account for 30-80% of the percentage mass content of the electrolyte; when the gel polymer electrolyte is prepared, the perfluocarbon polymer electrolyte base materials are placed in a lithium hydroxide solution to be subjected to lithiation treatment, washing is conducted, after drying is conducted, the treated perfluocarbon polymer electrolyte base materials are steeped in the electrolyte solution, full swelling is conducted, and then the gel polymer electrolyte for the lithium-air battery is prepared. Compared with the prior art, according to the gel polymer electrolyte for the lithium-air battery, prominent and excellent chemical stability can be achieved, the nucleophilic attack of superoxide ions in the lithium-air battery can be effectively resisted, and therefore prominent improvement effects on the battery capacity, the rate capacity and the cycling stability are achieved.

The invention discloses a preparation method of a lithium battery diaphragm. The method comprises the following steps: firstly, protecting a hydroxy of dihydro-2,4,6-trioxo-1,3,5-triazine-1,3(2H,4H)-dipropionic acid, then generating a polycondensation reaction with 2,2-bi[4-(4-aminophenoxy)phenyl]hexafluoropropane, performing deprotection, then performing 3-(dimethylamino) ethyl acrylate graft modification on the obtained polycondensate, uniformly mixing the polycondensate with surface-modified nano calcium carbonate and 2,7-naphthyl dithiol, obtaining a polymer film though melting and heat setting processes, and finally forming holes. The lithium battery diaphragm prepared by the above preparation method disclosed by the invention has higher lithium ion conductivity, more excellent weather resistance, thermal stability and electrochemical stability, and maintains high wettability to the electrolyte and better mechanical properties in a repeated charge and discharge process.

The invention relates to the technical field of lithium ion batteries, in particular to a spherical ternary composite positive electrode material of a lithium ion battery and a preparation method thereof. The spherical ternary composite positive electrode material of the lithium ion battery is prepared from the following components in percentage by mass: 80-90% of NCM powder balls, 5-10% of solidelectrolyte LLZO and the balance of graphene. On the basis of an NCM ternary material pure sample, a layer of graphene is coated again, so that the electronic conductivity of the material can be improved, the rate capability of the material is improved, and meanwhile, the flexible graphene can slow down irreversible reduction of capacity caused by mentioned deformation in the charging and discharging process of the NCM, and the cycle performance of the material is improved.

The invention discloses a ternary positive electrode material of a lithium ion battery and a preparation method of the ternary positive electrode material. The ternary positive electrode material comprises a ternary material and a coating layer coated on the surface of the ternary material, wherein the coating layer comprises a Li < 2 + x > C < 1-x > Bx O3 coating agent, and x is greater than 0 and less than 1. The preparation method comprises the steps of (1) mixing a ternary positive electrode material precursor with a lithium source and a doping agent, and carrying out primary calcination to obtain primary calcined sample powder; (2) dispersing the primary calcined sample powder into an alkaline solution, stirring to fully wet the primary calcined sample powder, performing suction filtration, drying in a vacuum environment, and performing secondary calcination to obtain secondary calcined sample powder; and (3) uniformly mixing the secondary calcined sample powder with a coating material comprising a Li < 2 + x > C < 1-x > Bx O3 coating agent, and performing tertiary calcination. By improving the coating agent and the preparation method, the surface of the ternary positive electrode material is coated with a layer of material with relatively high lithium ion conductivity, so that the capacity performance and the cycle performance of the battery are effectively improved.

The invention provides a preparation method of a graphene/poly-anthraquinone thioether/sulphur composite cathode material. The preparation method comprises the following steps: (1) dissolving sodium sulfide and elemental sulfur into distilled water to obtain an orange solution, adding Triton X-100, adding concentrated hydrochloric acid and gradually forming a yellow suspension liquid; (2) adding graphite oxide to the distilled water for ultrasonic treatment, obtaining a graphene oxide solution and adding the yellow suspension liquid to obtain dark grey sulfur graphene oxide; (3) adding a potassium iodide solution to the obtained sulfur graphene oxide composite material, and adding diluted hydrochloric acid to obtain a sulfur graphene composite material; and (4) adding the obtained sulfur graphene composite material to N-methylpyrrolidone for stirring, adding 1,5-dichloroanthraquinone for stirring, and then adding anhydrous sodium sulfide to obtain the poly-anthraquinone thioether/graphene/sulphur composite material. The sulphur in the composite material is coated with flexible graphene and poly-anthraquinone thioether, so that dissolution of a discharge product polysulfide can be inhibited; and volume expansion is relieved.

The invention provides a silicon-carbon system lithium ion battery electrolyte and a silicon-carbon system lithium ion battery. The silicon-carbon system lithium ion battery electrolyte comprises an organic solvent, an electrolyte lithium salt and additives, wherein the additives include propylene sulfite and tetramethyl diamine compounds; when the electrolyte is used in the silicon-carbon systemlithium ion battery, the conductivity of the electrolyte and the stability of a negative electrode silicon carbon interface film can be improved; and meanwhile, the expansion rate of the battery is reduced, the internal resistance is lowered, and the high and low temperature discharge performance of the silicon-carbon system lithium ion battery is improved.

The invention relates to the field of lithium battery electrolytes, and discloses a solid-state lithium battery polymer electrolyte containing a PEO side chain segment and a preparation method. The preparation method comprises the following steps: (1) adding Butanedithiol, acrylate and polyoxyethylene macromonomers into toluene, and heating and stirring to obtain a mixed material; (2) adding azodiisobutyronitrile into the mixed material obtained in the step (1), and carrying out a constant-temperature stirring reaction to obtain a PMMA-g-PEO material; and (3) firstly adding N, N-diethylethylamine for reaction, then adding a lithium salt electrolyte for mixing and centrifugal separation, and finally drying a solid product to obtain the solid-state lithium battery polymer electrolyte containing the PEO side chain segment. The solid-state lithium battery polymer electrolyte containing the PEO side chain segment has the advantages of low crystallinity, high lithium ion migration efficiency, good lithium salt adsorbability, increase of the lithium ion concentration, and substantial increase of the lithium ion conductivity of the polymer electrolyte.

The invention provides a polymer solid electrolyte membrane as well as a preparation method and application thereof. The solid electrolyte membrane comprises a polymer matrix, a lithium salt and a plasticizer, wherein the molecular chain of the polymer matrix comprises four components: a main monomer for providing a lithium ion transmission channel, a high-pressure stabilizer for providing high-pressure stability, a softening agent for improving the flexibility of a polymer chain, and a cross-linking agent for improving the mechanical strength. The polymer solid electrolyte membrane has relatively high lithium ion conductivity, excellent high-voltage stability and cycling stability, and can be widely applied to polymer all-solid-state batteries.

The invention discloses a printing-like integrated all-solid-state lithium metal battery and a preparation method thereof. The printing-like integrated all-solid-state lithium metal battery is formedby printing layer by layer according to the sequence of a lithium negative electrode SEI membrane, a solid polymer electrolyte membrane and a positive electrode. The printable integrated all-solid-state lithium metal battery prepared by the invention has the advantages of high lithium ion conductivity, good interface compatibility, simple preparation process, printable production, cheap and easilyavailable raw materials and the like. The printable integrated all-solid-state lithium metal battery designed by the invention is high in discharge capacity and good in cycle performance.