374 results about "Fast ion conductor" patented technology

The invention discloses a silicon negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The silicon negative electrode material comprises a silicon material substrate and a coating layer coating the surface of the silicon material substrate, the coating layer comprises cyclized polyacrylonitrile and a fast ion conductor. According to the silicon negative electrode material provided by the invention, a uniform cyclized polyacrylonitrile and fast ion conductor coating layer is constructed on the surface of a silicon material matrix. The good electronic conductivity and elasticity of the cyclized polyacrylonitrile and the excellent ionic conductivity of the fast ion conductor are beneficial to buffering the volume expansion of the silicon carbon material, accelerating the lithium ion transmission kinetics and effectively improving the rate capability of the negative electrode material; the cyclized polyacrylonitrile has high chemical stability and strong compatibility with the silicon material and the sulfide solid electrolyte, and is used as a buffer layer between the silicon material and the sulfide solid electrolyte to avoid direct contact between the silicon carbon material and the sulfide solid electrolyte, inhibit interface side reaction and effectively improve the cycle stability of the battery.

The invention provides a lithium-rich manganese-based positive electrode active material and a preparation method and application thereof. The lithium-rich manganese-based positive electrode active material comprises a lithium-rich manganese-based core, a first coating layer and a second coating layer, the chemical formula of the lithium-rich manganese-based core is Li < 1 + x > Ni Mn M < c > O < 2 + x >; 0.25 < = x < = 0.4, a + b + c = 1, 0.33 < = a < = 0.35, 0.63 < = b < = 0.65, and 0 < = c < = 0.02; m is selected from at least one of W, Ta, Nb, Ti, Sb, Al, Mg, Zr, Sr and Mo; the first coating layer is X-doped nano layered lithium cobalt oxide, and X is selected from at least two of Al, La, Nb, Sr, Ti, Mn, Mo, Ta, W, K, B and F; and the second coating layer comprises a fast ion conductor and / or a spinel-like phase cobalt lithium compound. The positive electrode active material provided by the invention has excellent storage capacity.

The invention provides a carbon-based negative electrode material, a preparation method, a secondary battery and an electric device. The carbon-based negative electrode material is granular and comprises a carbon-based core and a composite coating layer, the composite coating layer is formed on the surface of the carbon-based core and comprises a fast ion conductor and a coating auxiliary agent, and the coating auxiliary agent is used for being connected with the fast ion conductor and the carbon-based core in a chemical bonding and / or physical adsorption mode. Therefore, the composite coating layer containing the fast ion conductor stably coats the carbon-based core. A negative electrode of a secondary battery includes a carbon-based negative electrode material. The power utilization device comprises a secondary battery. The composite coating layer effectively coats the surface of the carbon-based core with the fast ion conductor, can effectively ensure the integrity of the composite coating layer in the subsequent processing process of the carbon-based negative electrode material, keeps stable coating of the fast ion conductor on the surface of the carbon-based core, and improves the coating rate of the fast ion conductor on the surface of the carbon-based core; and it is ensured that desolvation and ion transmission of lithium ions at the interface of the carbon-based negative electrode material are effectively promoted in the process that the carbon-based core stores the lithium ions.

The invention discloses a lithium ion battery composite diaphragm, a preparation method and a lithium ion battery, and relates to the technical field of lithium ion batteries. The lithium ion battery composite diaphragm comprises a base membrane and a functional coating arranged on the negative electrode side of the base membrane, the functional coating sequentially comprises an ion conducting layer, a thermal barrier layer and a self-repairing layer from the position close to the base film to the position far away from the base film; wherein the base membrane is a polyimide and aramid nanofiber blended electrostatic spinning membrane; the ion conducting layer comprises a compound of a modified fast ion conductor and polyvinylidene fluoride-hexafluoropropylene; the thermal barrier layer comprises a cross-linked network of boron nitride nanosheets and polybenzimidazole; the self-repairing layer comprises polyurethane microspheres loaded with dynamic disulfide bonds. The composite diaphragm provided by the invention can remarkably inhibit a purple area on the surface of a negative electrode, and enhance high-temperature self-protection and interface self-repairing of the lithium ion battery, so that the cycle and safety performance of the lithium ion battery are remarkably improved.

The invention discloses a composite solid electrolyte membrane, a solid lithium metal battery and a preparation method thereof, the composite solid electrolyte membrane comprises a fast ion conductor filler, a PVDF polymer matrix, a lithium salt and an amide additive, and the amide additive can perform weak coordination with lithium ions. According to the composite solid-state electrolyte membrane, the solid-state lithium metal battery and the preparation method of the solid-state lithium metal battery, disclosed by the invention, the room-temperature ionic conductivity of all-solid-state composite electrolyte can meet room-temperature operation of the battery, and the solid-state lithium metal battery is suitable for large-scale production and application.

The invention provides a fast ion conductor coated manganese-based lithium supplement agent as well as a preparation method and application thereof, and belongs to the field of lithium supplement materials of lithium ion batteries. According to the invention, the fast ion conductor is used as a coating material, so that the manganese-based lithium supplement agent can be protected, and the transmission of lithium ions on the interface of the lithium supplement agent can be ensured; the fast ion conductor has the characteristics of high air stability and low possibility of being oxidized, and the surface of the manganese-based lithium supplement agent is modified by adopting the fast ion conductor with a nano size, so that a nano-scale modified thin layer can be formed, a tight heterogeneous interface is formed, the transmission of lithium ions on the interface of the lithium supplement agent is facilitated, and the passing of other impurities can be avoided; therefore, the rate capability, the electrochemical stability and the air stability of the manganese-based lithium supplement agent are improved, and the manganese dissolution phenomenon and the electrochemical polarization of the manganese-based lithium supplement agent are reduced.

The invention discloses a LiAlO2 fast ion conductor coated silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The LiAlO2 fast ion conductor coated silicon carbon composite material has a core-shell structure; an inner core of the composite material is a silicon-carbon composite material, the silicon-carbon composite material is formed by coating a three-dimensional carbon material with an amorphous carbon layer and loading a nano silicon compound, a shell of the composite material is a LiAlO2 fast ion conductor layer, and the silicon-carbon composite material with a three-dimensional network structure is constructed, and the surface of the silicon-carbon composite material is coated with the LiAlO2 fast ion conductor layer, so that the composite material is obtained. According to the present invention, with the LiAlO2, the volume expansion of the nanometer silicon during the charge-discharge process can be effectively relieved, the stability of the silicon-carbon composite material structure can be improved so as to significantly improve the cycle performance of the battery, and the LiAlO2 can provide the rapid channel for the transmission of the lithium ion during the charge-discharge process so as to improve the rate performance of the battery;

The invention relates to a silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: adding porous carbon into a fluidized bed, heating and introducing alkaline mixed gas to obtain amino porous carbon; transferring the amino porous carbon into fluidized bed equipment, vacuumizing, heating, and introducing hydroxyl silane gas for nano silicon deposition; after deposition, introducing ultraviolet light for polymerization and oxidation to obtain a modified silicon-carbon precursor material; transferring the modified silicon-carbon precursor material into a tubular furnace, introducing inert gas to discharge air in the tube, and performing first carbonization to obtain a silicon-carbon material; and adding the resin into an organic solvent, adding the fast ion conductor and the silicon carbon material to be uniformly dispersed, performing spray drying, and performing secondary carbonization to obtain the fast ion conductor coated silicon carbon composite material. The preparation method provided by the invention is simple and efficient, and the prepared silicon-carbon composite material can improve the fast charging performance and is suitable for a negative electrode material of a high-energy-density lithium ion battery.

The invention discloses a method for directly repairing and regenerating a ternary positive electrode recycled material. The method comprises the following steps: S1, disassembling a ternary retired battery; s2, sintering to remove impurities; s3, removing powder and sieving; s4, mixing with crystalline lithium salt; s5, crushing and sieving after sintering and cooling; s6, mixing with a metal oxide; and S7, sintering, cooling, removing iron, and sieving. The eutectic lithium salt is used as a lithium source for lithium supplement, so that the diffusion rate of lithium ions can be increased, the concentration of the lithium ions can be improved, the reaction temperature of lithium supplement recovery can be reduced, and the energy consumption can be reduced. The ternary lithium battery is wrapped by the metal oxide, residual lithium on the surface of the material can be utilized, a layer of fast ion conductor can be formed on the surface of the material in situ, and the residual lithium on the washed surface is removed, so that the process is shortened, the cost is reduced, the transmission rate of lithium ions can be further improved, and the rate capability of the battery is improved. And the fast ion conductor structure can isolate the contact between the electrolyte and the positive electrode material, so that side reaction is reduced, and the cycle performance is improved.

The invention relates to the technical field of batteries, in particular to a composite negative electrode material as well as a preparation method and application thereof. The composite negative electrode material comprises a negative electrode base material and a fast ion conductor layer located on the surface of the negative electrode base material, the negative electrode base material comprises a silicon nanosheet and a carbon coating layer located on the surface of the silicon nanosheet, and the surface of the carbon coating layer is doped with element nitrogen; and the fast ion conductor layer comprises Li3PO4. According to the composite negative electrode material disclosed by the invention, through coordination and cooperation of all the layers, the problem of capacity fading of a pure silicon negative electrode in a circulation process can be relieved, stable long-cycle performance is realized, and a high capacity retention ratio is obtained.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly relates to a double-strategy modified high-nickel positive electrode material as well as a preparation method and application thereof. According to the double-strategy modified high-nickel positive electrode material, a high-nickel positive electrode material serves as a matrix, surface coating and bulk phase doping are achieved at the same time through competitive doping of main group elements, a coating layer is a fast ion conductor LiLaO2 nano layer, and a bulk phase doping element is Y. The fast ion conductor coating layer can provide an additional ion channel, promote conduction of ions on the surface of the positive electrode material, reduce interface impedance and improve the rate capability of the battery. The doping elements can optimize the crystal structure of the positive electrode material and can relieve stress generated in the charging and discharging process, so that phase change and structural degradation are reduced, and the structural stability of the positive electrode material is improved.

The invention discloses a sodium-ion battery positive electrode material and a preparation method thereof, a positive plate and a negative-electrode-free sodium-ion battery, and relates to the technical field of sodium-ion batteries. According to the sodium battery positive electrode material provided by the invention, the inner layer is the layered oxide, the outer layer is the sodium-lanthanum-zirconium-oxygen coating layer, and the dissolution phenomenon of Fe < 3 + > in the layered oxide material can be relieved by utilizing the sodium-lanthanum-zirconium-oxygen coating layer; the sodium lanthanum zirconium oxide material belongs to a solid electrolyte and is a fast ion conductor of sodium ions, so that the injection amount of the electrolyte can be reduced, the growth of dendritic crystals can be reduced, the safety performance of the battery can be improved, and the capacity exertion of the active material can be improved. Based on the advantages, the sodium battery positive electrode material provided by the invention can improve the safety and the cycle life of the battery.

The present invention discloses a high-nickel ternary positive electrode material containing an organic-inorganic composite coating and a preparation method thereof, and relates to the technical field of lithium-ion batteries. The high-nickel ternary positive electrode material containing an organic-inorganic composite coating includes inorganic lithium-containing fast ion conductor particles, which are randomly distributed on the surface of the high-nickel ternary positive electrode material in a point shape, and are embedded in an organic conductive polymer film. The active group at one end of the organic conductive polymer is chemically bonded to the transition metal on the surface of the high-nickel ternary positive electrode material to form an M-O bond, so that the organic conductive polymer is firmly compounded on the surface of the high-nickel ternary positive electrode material. The present invention also provides a preparation method thereof. The high-nickel ternary positive electrode material containing an organic-inorganic composite coating provided by the present invention can simultaneously improve the stability and conductivity of the high-nickel ternary positive electrode material, and effectively solve the problems of poor thermal stability, many surface side reactions and short cycle life of the existing high-nickel ternary material.

The invention provides a carbon-based negative electrode material, a preparation method, a secondary battery and an electric device. The carbon-based negative electrode material is granular and comprises a carbon-based core and a coating structure, the coating structure comprises a fast ion conductor layer and a stable modification layer which are sequentially arranged on the surface of the carbon-based core, the fast ion conductor layer is arranged on the surface of the carbon-based core, and the stable modification layer is arranged on the surface of the fast ion conductor layer; the stable modification layer has electron and ion transmission capability and has self-supporting performance through chemical bonding connection in the layer so as to protect the fast ion conductor layer. A negative electrode of a secondary battery includes a carbon-based negative electrode material. The power utilization device comprises a secondary battery. The stable modification layer has relatively good ion electron transmission capability and structural stability, and can improve the retention rate of the fast ion conductor layer in the negative electrode material processing process and the battery operation process, so that the structural integrity of the negative electrode active material is protected, and the stability of the battery performance is improved.

The invention relates to the technical field of lithium ion batteries, in particular to a silicon-carbon negative electrode material and a preparation method thereof. The preparation method of the silicon-carbon negative electrode material comprises the following steps: carrying out liquid-phase coating treatment on a porous carbon material and a fast ion conductor precursor to form a porous carbon material coated with a fast ion conductor so as to prepare a modified porous carbon material; carrying out first chemical vapor deposition treatment by taking silane gas as a deposition precursor, and depositing nano silicon on the surface of the modified porous carbon material to prepare a silicon-carbon core; and carrying out secondary chemical vapor deposition treatment by taking a soft carbon gas source as a deposition precursor in an inert gas atmosphere, and depositing nano soft carbon on the surface of the silicon-carbon inner core to prepare the silicon-carbon negative electrode material. The preparation method of the silicon-carbon negative electrode material solves the technical problem that the electrochemical performance of the silicon-carbon material is poor due to the fact that the volume of the existing silicon material is expanded and the ionic conduction performance is reduced by a carbon coating technology.

The invention provides a negative electrode current collector and a preparation method and application thereof, and relates to the technical field of batteries. The negative electrode current collector provided by the invention comprises a metal net and slurry layers coated on two surfaces of the metal net, the slurry layer is mainly composed of a conductive carbon material, metal particles, a sodium-based fast ion conductor or a lithium-based fast ion conductor and a binder; the conductive carbon material is mainly composed of a point type carbon material, a linear carbon material and a surface type carbon material; and the porosity of the slurry layer is 30%-40%. The negative electrode current collector is low in cost, has a porous structure, has sufficient sodium metal or lithium metal deposition space, can enable sodium metal or lithium metal to grow in the negative electrode current collector when being used for a negative-electrode-free electrode, is small in volume change of a battery, and reduces the occurrence of sodium dendrites or lithium dendrites.

The invention provides a positive electrode active material and a preparation method thereof, a positive electrode and a solid-state battery, and particularly relates to the technical field of solid-state batteries. The positive electrode active material has a core-shell structure, and the core-shell structure comprises a core layer and a coating layer coating the core layer; the core layer is made of a lithium-rich manganese-based material; and the coating layer is made of a fast ion conductor and a halide solid electrolyte. The fast ion conductor in the coating layer of the positive electrode active material can improve the ionic conductivity of the surface layer of the positive electrode active material, promote rapid migration of lithium ions and assist in improving the initial coulombic efficiency. Meanwhile, the coating layer improves the chemical stability of the positive electrode active material, effectively inhibits the interface side reaction between the positive electrode body and the sulfide electrolyte, and relieves the structural degradation in the cycle process. The coating layer can also be used as a buffer layer to inhibit stress generated by volume shrinkage and expansion in charge and discharge cycles, maintain good contact of an electrode interface, and realize improvement of the electrochemical performance of the material.

The invention relates to a lithium ion battery and a preparation method thereof. The lithium ion battery comprises a positive pole piece, a negative pole piece and a gel electrolyte, the gel electrolyte is formed by polymerizing an electrolyte prepolymerization solution, and the mass percentages of a cross-linking agent, a monomer and an initiator in the electrolyte prepolymerization solution are A%, B% and C% respectively; a positive electrode material layer in the positive electrode plate is formed by coating the surface of a positive electrode current collector with positive electrode slurry; the positive electrode slurry comprises a fast ion conductor, and the mass percentage content of the fast ion conductor in the positive electrode slurry is X%; the lithium ion battery satisfies the following relational expressions: the formula 1: 5 < B / A < 10; in the formula 2, C / (A + B) is more than 0.005 and less than 0.02; formula 3: 1.7 < = (A + B + C) / X < = 5.5. According to the scheme provided by the invention, a high-performance organic-inorganic hybrid network can be constructed, and the cycle performance of the battery is remarkably improved while the thermal shock performance of the battery is improved.

The present invention relates to the field of positive electrode materials, and provides a positive electrode material and a preparation method therefor, and a battery. The positive electrode material comprises a base material and a coating layer located on the surface of the base material. The chemical general formula of the base material is LiaNibCocMdO2, wherein 0.95≤a≤1.08, 0.3≤b≤1, 0≤c≤0.7, 0≤d≤0.2, b+c+d=1, and M is a metal element. The coating layer comprises a fast ion conductor material. In an XRD spectrum of the positive electrode material, the number of crystal planes of the positive electrode material on a crystal plane (003) is P003, the number of crystal planes of the positive electrode material on a crystal plane (104) is P104, 10≤P003≤300, 10≤P104≤400, and 0.55≤P003 / P104. According to the positive electrode material, the impedance of the positive electrode material is reduced, the transmission of lithium ions is accelerated, and the initial discharge capacity and the initial coulombic efficiency are improved.

The invention provides a positive pole piece, a battery and a preparation method of the positive pole piece. The positive pole piece comprises a positive current collector and a composite layer arranged on the surface of at least one side of the positive current collector, the composite layer comprises a first composite layer, a second composite layer and a third composite layer which are sequentially arranged along the thickness direction of the positive pole piece, and the first composite layer is arranged on the surface of the positive current collector; the first composite layer comprises a first conductive agent and a first binder, the second composite layer comprises a positive electrode active material, a second conductive agent, a second binder and a first fast ion conductor, and the third composite layer comprises a third conductive agent, a third binder and a second fast ion conductor. According to the invention, the electrochemical performance of the battery prepared by a dry-method electrode preparation process can be effectively improved.

The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a preparation method thereof and a battery. The composite positive electrode material comprises a positive electrode substrate, a fast ion conductor layer and a halide layer, the positive electrode substrate comprises a doped lithium cobalt oxide material; the fast ion conductor layer is positioned on the surface of the positive electrode substrate and comprises an oxide of a metal element Q with a spinel phase; the halide layer is located on the surface of the fast ion conductor layer and comprises element lithium, metal element M and halogen X. Through coordination and cooperation of the matrix material, the fast ion conductor layer and the halide layer, the structural stability and the surface morphology of the material can be effectively improved, the defects of the material are overcome, and the composite positive electrode material has excellent conductivity and has excellent cycling stability and rate capability at high temperature and / or high voltage, so that the battery has high safety performance.

The invention discloses a composite coated modified positive electrode material, a preparation method thereof and a secondary battery, the composite coated modified positive electrode material provided by the invention comprises a positive electrode material and a composite coating layer on the surface of the positive electrode material, and the composite coating layer is composed of a fast ion conductor and a conductive polymer. The used fast ion conductor is a self-synthesized fast ion conductor and has the characteristics of stable crystal lattice, low surface brittleness and high ionic conductivity, the fast ion conductor and the conductive polymer are simultaneously coated on the surface of the positive electrode material to form a composite coating layer, and an electron-ion double-conduction transmission network is formed on the surface of the positive electrode material; the interface stability of the positive electrode material is enhanced, the volume expansion effect is relieved, and the electrochemical performance of the positive electrode material is comprehensively and effectively improved.

The invention discloses a fast ion conductor coated sodium ion battery manganese-based positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The method comprises the following steps: S1, synthesizing a Zn < x > Mg < y > Mn < 1-x-y > CO < 3 > precursor based on a coprecipitation reaction; s2, carrying out coating modification on the precursor by using an aluminum source; and S3, roasting the coated modified precursor and a sodium source at high temperature to obtain the fast ion conductor coated sodium ion battery manganese-based positive electrode material. According to the material, a co-doped precursor material is obtained by doping zinc and magnesium elements in a manganese-based oxide at a precursor end, the doping of zinc and magnesium enables the material to have a wide lattice spacing, and the diffusion barrier of Na < + > in the charging and discharging process is reduced; sodium metaaluminate formed on the surface of the material is uniformly distributed, so that the direct reaction between the positive electrode material and electrolyte in the charging and discharging process is inhibited; and meanwhile, the fast ion conductor coating layer can also improve the ionic conductivity of the material and improve the rate capability.

The invention discloses a lithium-rich manganese-based positive electrode material with a fast ion conductor coating layer and bulk phase doping and a preparation method of the lithium-rich manganese-based positive electrode material, the surface of the lithium-rich manganese-based positive electrode material is coated with the coating layer composed of amorphous Li3PO4, the interior of the bulk phase is doped with other elements, the structural formula of the lithium-rich manganese-based positive electrode material is Li < 1 + a > Mn M < c > O < 2 >, m is one or more than one of Ni, Co, A1, Cr, Fe, Mg and Ce, 0 lt; a is less than or equal to 0.2, 0lt; b < = 1, 0lt; c < = 1, and a + b + c = 1. The method comprises the following steps: (1) fully mixing a lithium-rich manganese-based positive electrode material precursor, a certain proportion of lithium salt and a proper amount of phosphate; and (2) sintering the uniformly mixed sample in a certain atmosphere to obtain the lithium-rich manganese-based positive electrode material with the fast ion conductor coating layer and the bulk phase doping structure. The first coulombic efficiency of the lithium-rich positive electrode material is improved, the cycling stability and the rate capability of the lithium-rich positive electrode material are improved, and the requirements of a power battery can be met.

The application belongs to the technical field of lithium ion batteries, and relates to a solid-state electrolyte interface layer for a lithium metal negative electrode and an in-situ plasma construction method and application thereof. The core of the method is to use an organic-inorganic-alloy component precursor as a plasma reaction source, to control the mixing ratio and reaction conditions to perform plasma reaction on the surface of lithium metal, and to in-situ construct a unique gradient layered structure of an organic-inorganic-alloy composite artificial solid-state electrolyte interface layer. The outer layer of the solid-state electrolyte interface layer is a flexible organic phase, the middle layer is a rigid inorganic fast ion conductor, and the inner layer is a lithiumophilic alloy phase, which can synergistically inhibit lithium dendrite growth and significantly improve the interface stability of the lithium metal negative electrode. Meanwhile, the preparation method provided by the application is simple, rapid, efficient, environmentally friendly, mild in conditions and easy to control, significantly improves the cycle stability and coulombic efficiency of the lithium metal negative electrode, and is helpful to promote the development of high-energy-density lithium metal batteries.

An in-situ coated ternary positive electrode composite material, and the preparation and use thereof. The in-situ coated ternary positive electrode composite material comprises a ternary positive electrode base material and a fast ion conductor material, which is in-situ coated on and chemically bonded to the surface of the ternary positive electrode base material, wherein the ternary positive electrode base material is LiNi1-x-yCoxMnyO2, and the fast ion conductor material is Li2TiO3, where 0.02≤x+y≤0.67. By means of wet coating followed by lithium mixed sintering, the synchronous generation of an outer layer (Li2TiO3) and an inner layer (LiNi1-x-yCoxMnyO2) is realized, and the chemical bonding between the inner layer and the outer layer is achieved while the coating uniformity is improved, such that the coated lithium ion conductor Li2TiO3 is not prone to falling off during the charging and discharging of a battery, thereby finally improving the rate capability and the cycling performance of the ternary positive electrode composite material.

A sodium ion battery positive electrode material, a preparation method therefor, and a use thereof, relating to the technical field of sodium ion batteries. The sodium ion battery positive electrode material comprises a polyanionic iron-manganese-based inner core material and a fast ion conductor layer coating the outer surface of the polyanionic iron-manganese-based inner core material; the polyanionic iron-manganese-based inner core material comprises iron and manganese, and the iron and the manganese are non-uniformly distributed in the polyanionic iron-manganese-based inner core material; in the centre of the polyanionic iron-manganese-based inner core material, the manganese content is higher than the iron content; and in the surface layer of the polyanionic iron-manganese-based inner core material, the iron content is higher than the manganese content. The uneven component distribution of the iron and manganese in the inner core material of the positive electrode material can effectively relieve the risk of structural collapse caused by metal ion migration during cycling; the fast ion conductor coating layer reduces the side reactions caused by electrolyte corrosion; and the problems of low capacity, fast attenuation, and low energy density of traditional single-phase materials are effectively solved.

The invention provides a lithium ion battery positive electrode material and a preparation method and application thereof. According to the lithium ion battery positive electrode material, the lithium ion battery positive electrode material has a core-shell structure, a lithium layered metal oxide, a composite double-phase coating layer and a carbon coating layer are distributed from the center to the surface of the lithium ion battery positive electrode material, and the composite double-phase coating layer is prepared from a fast ion conductor and an oxide. The lithium ion battery positive electrode material provided by the invention solves the problems of limited rate capability and poor cycling stability of a ternary material, improves the capacity retention ratio of a lithium ion battery under high-power charging and discharging conditions, inhibits interface side reaction between an electrode material and an electrolyte, and prolongs the service life of the battery. The invention also provides a preparation method and application of the lithium ion battery positive electrode material.

The invention provides a lithium nickel manganese oxide positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. Comprising an inner core and a coating layer, the chemical general formula of the inner core is Li Ni < x > Mn < y > M < z > M'wO < 4 >; m comprises one or more of Al, Mg, Co, Mn, Ni, Ti, Zr, W, Nb, P, Sb, F, Sr and Se; m'comprises one or more of Mg, Co, Mn, Ni, Ti, Zr, W, Nb, P, Sb, F, Sr and Se; the coating layer comprises a LiM ''O-type fast ion conductor, and M'' comprises one or more of Mg, Al, Co, Mn, Ni, Ti, Zr, W, Nb, Sb, La and Se. According to the lithium nickel manganese oxide positive electrode material, M and M'are cooperatively doped, and then fast ion conductor coating is performed, so that the ion conductivity of the positive electrode material and the structural stability of the material under high voltage are remarkably improved.

The invention belongs to the technical field of solid-state electrolytes, relates to a water-soluble polymer solid-state electrolyte and a preparation method and application thereof, and particularly relates to a water-soluble environment-friendly polymer composite solid-state electrolyte, a preparation method and a solid-state lithium / sodium battery. The water-soluble polymer solid electrolyte is prepared by preparing the water-soluble block polymer, the metal salt and the fast ion conductor into slurry, blade-coating the slurry on the porous fiber skeleton and drying to form a film, and the water-soluble polymer solid electrolyte is low in preparation raw material cost, free of emission of organic pollutants, good in environmental protection property, prepared under the air condition, free of harsh preparation conditions, suitable for industrial production and suitable for industrial production. Meanwhile, the prepared solid electrolyte has the characteristics of high ionic conductivity and good interface stability, and can be applied to electrochemical devices such as solid lithium batteries and solid sodium batteries.