74 results about "Lithium ion conduction" patented technology

A secondary battery comprises a positive electrode layer (14), a negative electrode layer (12), and an electrolyte layer (15) for conducting lithium ions between the positive and negative electrode layers. The positive electrode layer contains a positive electrode active material (14a) containing Mn and an oxide-based ion conductor (14b) with lithium ion conductivity. The electrolyte layer contains a fluorinated lithium salt containing fluorine atoms and a solvent capable of dissolving the fluorinated lithium salt. The ion conductor is a dielectric that promotes the dissociation of lithium ions from the fluorinated lithium salt.

Provided is a lithium metal secondary battery having a novel structure in which an intermediate layer is provided between a negative electrode layer and a solid electrolyte layer, lithium metal can be uniformly deposited on the intermediate layer-side surface of the negative electrode layer, and dendrites are not easily generated. This lithium metal secondary battery is provided with a positive electrode layer, a negative electrode layer, a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, and an intermediate layer disposed between the negative electrode layer and the solid electrolyte layer, and is characterized in that: a lithium metal layer is disposed on the surface of the negative electrode layer on the intermediate layer side; and an intermediate layer insulating material that covers the outer peripheral surface of the intermediate layer, the intermediate layer insulating material not having lithium ion conductivity.

The application discloses a high lithium ion conductivity flame-retardant interface modifier and a preparation method thereof. The material is synthesized by one-pot one-step reaction of phosphorus oxychloride, diamine and alcohol ether compound, and is used in combination with lithium salt to form a flame-retardant interface modifier with high lithium ion conduction function. The molecular structure is rich in ether bonds, which can effectively coordinate with lithium ions, promote the efficient migration of lithium ions at the electrode interface, and significantly improve the cycle stability and rate performance of the solid-state battery. At the same time, the nitrogen and phosphorus elements introduced in the material endow it with excellent flame-retardant properties, which helps to improve the safety of the battery system. In addition, the modifier has good flowability and wettability, which can enhance the interface compatibility between the components in the solid-state battery. The preparation process of the application is simple, controllable, reproducible and low in cost, and is suitable for interface modification of solid-state lithium ion batteries, and has important prospects for promoting the development of high-safety, high-energy-density and low-cost solid-state batteries.

Provided are: a negative electrode for an all-solid-state secondary battery, which has a low resistance value; a method for producing the negative electrode; and an all-solid-state secondary battery. The present invention relates to targets 12, 3, 7, 11 of sustainable development targets (SDGs). This negative electrode for an all-solid-state secondary battery is characterized by comprising a molded body of a negative electrode mixture containing a solid electrolyte and a negative electrode material containing a negative electrode active material, the negative electrode material containing, as the negative electrode active material, a carbon material having, on the surface thereof, a layer containing an oxide having lithium ion conductivity. The carbon material contains hard carbon, the oxide contains a lithium titanium oxide, the amount of the oxide is 1 part by mass or more with respect to 100 parts by mass of the carbon material, a sulfide-based solid electrolyte is contained as the solid electrolyte, and the thickness of a molded article of the negative electrode mixture is 200 [mu] m or more and 3000 [mu] m or less.

The invention relates to a solid-state battery with a composite interface and a preparation method of the solid-state battery. The solid-state battery comprises a positive plate, a negative plate, SEI protection layers coated on the positive plate and the negative plate, and a lithium ion conduction agent coating layer between the SEI protection layers. The SEI protective layer is formed by compounding a polymer matrix and an ion conduction lithium salt through a dip-coating method, the lithium ion conduction agent coating layer comprises an electrolyte lithium salt, a tackifier and an oxide solid electrolyte, and the lithium ion conduction agent coating layer is formed by mixing to prepare a lithium ion conduction agent and coating the lithium ion conduction agent. The problems that a traditional battery is lack of flexibility and poor in safety and an existing solid-state battery is high in interface impedance and short in cycle life are solved, cooperation of flexible protection and efficient ion conduction is achieved, the 200-circle cycle capacity retention rate reaches 90% or above, the preparation process is simple and controllable, material compatibility is good, an existing production line does not need to be transformed, industrial popularization is facilitated, and the method is suitable for industrial production. The method is suitable for energy storage scenes such as flexible electronic equipment and electric automobiles.

The invention discloses a coated and modified high-nickel polycrystalline positive electrode material and a preparation method and application thereof, the coated and modified high-nickel polycrystalline positive electrode material provided by the invention comprises secondary polycrystalline particles composed of primary particles, the primary particles are arranged along the radial direction and are in contact with each other to form a grain boundary; a first coating layer is arranged at the grain boundary of the primary particle and the surface of the secondary polycrystalline particle, and the first coating layer comprises a fast ion conductor; and a second coating layer is also arranged on the first coating layer on the surface of the secondary polycrystalline particle. According to the coated and modified high-nickel polycrystalline positive electrode material, the lithium ion diffusion coefficient of the first coating layer is high, the diffusion impedance of lithium ions at the grain boundary can be reduced, and the interface lithium ion conduction is improved; the lithium ion diffusion coefficient of the second coating layer is lower than that of the first coating layer, and the second coating layer is used as a protective layer and can prevent the interface side reaction of the high-nickel polycrystalline positive electrode material and electrolyte, so that the electrochemical performance of the high-nickel polycrystalline positive electrode material is greatly improved.

Provided are: a negative electrode for an all-solid-state secondary battery, which has a low resistance value; a method for producing the negative electrode; and an all-solid-state secondary battery. The present invention relates to targets 12, 3, 7, 11 of sustainable development targets. The negative electrode for an all-solid-state secondary battery is characterized by comprising a molded body of a negative electrode mixture containing a solid electrolyte and a negative electrode material containing a negative electrode active material, the negative electrode material containing, as the negative electrode active material, a carbon material having, on the surface thereof, a layer containing an oxide having lithium ion conductivity. The carbon material contains at least one of graphite and hard carbon, the oxide contains at least one of lithium niobium oxide, lithium titanium oxide and lithium phosphorus oxide, the amount of the oxide is 1 part by mass or more with respect to 100 parts by mass of the carbon material, and a sulfide-based solid electrolyte is contained as the solid electrolyte. The thickness of the molded body of the negative electrode mixture is 200 [mu] m or more and 3000 [mu] m or less.

The application provides a lithium manganese iron phosphate positive electrode material and a surface lithiumation compensation process thereof, and belongs to the technical field of new energy batteries. The compensation process comprises the following steps: providing a lithium manganese iron phosphate base material; constructing an interface stabilization layer on the surface of the base material, wherein the interface stabilization layer is a rare earth oxide layer; and constructing a composite functional layer on the interface stabilization layer, wherein the composite functional layer comprises carbon material and composite fluoride, and the composite functional layer simultaneously provides stress buffering and lithium ion conduction functions. The lithium ion battery prepared from the lithium manganese iron phosphate positive electrode material has a significant improvement in cycle life and rate performance, can meet the demand of new energy vehicles and energy storage for high-performance batteries, and has a wide market application prospect.

The invention discloses an all-solid-state battery, a preparation method of the all-solid-state battery and a power utilization device. The all-solid-state battery comprises a positive pole piece with a high-voltage positive active material, a negative pole piece with a lithium metal negative active material and a solid electrolyte membrane, the solid-state electrolyte membrane comprises a first solid-state electrolyte layer in contact with the negative pole piece, an interface modification layer and a second solid-state electrolyte layer in contact with the positive pole piece, and the thickness of the first solid-state electrolyte layer is greater than or equal to that of the second solid-state electrolyte layer; the interface modification layer is an interface buffer layer with electronic insulation and lithium ion conduction, and the thermal expansion coefficient of the interface modification layer is between the thermal expansion coefficient of the first solid electrolyte layer and the thermal expansion coefficient of the second solid electrolyte layer. According to the solid electrolyte membrane with the layered structure, the problem of interface compatibility is solved, so that the safety of a battery is improved, and the cycle life of the battery is prolonged.

This application relates to the field of lithium-ion battery technology, and particularly to functional binders and their preparation methods, and lithium-ion batteries. The functional binder has a three-dimensional network structure and comprises the following raw material components: a main binder, a functional polyurethane, and a crosslinking agent. The functional polyurethane contains heterocyclic groups and functional groups. The heterocyclic groups contain hydrogen bond acceptors and hydrogen bond donors, and the functional groups include ion-conducting groups and / or electron-conducting groups. The crosslinking agent contains hydrogen bond donors, hydrogen bond acceptors, and positively charged groups. The main binder possesses basic adhesive properties; the functional polyurethane exhibits flexibility and elasticity. The functional polyurethane also forms a complementary hydrogen bond pairing mode with the crosslinking agent, enabling the crosslinking agent to accurately identify the heterocyclic groups on the functional polyurethane, resulting in high bonding strength. The crosslinking agent and the main binder generate electrostatic adsorption. Therefore, the functional binder possesses high flexibility, elasticity, adhesive properties, lithium-ion conductivity, and / or electronic conductivity.

The present invention relates to an electrolyte composition for a lithium secondary battery. The electrolyte composition for a lithium secondary battery comprises a fluorinated linear ester solvent and a fluorinated acrylic acid-based additive as a non-aqueous organic solvent and an electrolyte additive, respectively, thus, a solid electrolyte interface layer (SEI layer) having high lithium ion conductivity and excellent heat resistance can be uniformly formed on the surface of the negative electrode during activation of the lithium secondary battery. Accordingly, since the reactivity between the negative electrode active material and the electrolyte composition is significantly reduced, the temperature (heat generation initiation temperature) at which the negative electrode active material and the electrolyte composition begin to generate heat increases, thereby suppressing heat generation due to degradation of the negative electrode, etc. In addition, the lithium secondary battery containing the electrolyte composition has the advantage of excellent high-temperature safety because it can minimize side reactions of the electrolyte composition occurring on the surface of the negative electrode when exposed to high temperatures.

The invention provides an amorphous substance coated positive electrode active material as well as a preparation method and application thereof. In the invention, the amorphous substance is selected from one or more of transition metal silicide, boride, phosphide, sulfide, selenide, carbide, amorphous carbon or amorphous silicon materials. The amorphous substance coating in the invention can form a compact self-healing passivation layer at the interface of the positive electrode material, not only can inhibit oxygen precipitation under high voltage in dynamics, but also can be combined with Li alkali metal to become a mixed conductor of ions and electrons, so that the conduction performance of the electrons and lithium ions is improved, and the interface impedance is reduced. Meanwhile, the surface of the positive electrode material can be uniformly coated by a special coating mode of the amorphous substance, so that side reaction between the positive electrode material and electrolyte is effectively inhibited, a solid electrolyte membrane on the surface of the positive electrode material is stabilized, formation of microcracks in the material is reduced, and the cycling stability is improved.

This invention discloses an electrolyte and a lithium-ion battery. The electrolyte comprises a lithium salt, an organic solvent, a first additive, a second additive, and a conventional electrolyte. The first additive is a polysubstituted ethylene sulfate, the chemical structure of which is shown in Formula I. The second additive is fluoroethylene carbonate. The mass percentages a of the first additive and b of the second additive in the electrolyte satisfy: 2≤a≤4, 3≤b≤5, and 5≤|(a+b)×(a-b)|≤20. This invention, through the synergistic regulation of specific additives and their contents, can form a gradient structure SEI film with both high lithium-ion conductivity and high stability on the negative electrode surface, effectively suppressing electrolyte decomposition and side reactions under high temperature and high pressure conditions, reducing active lithium loss and interfacial impedance growth. Applying the electrolyte of this invention to lithium-ion batteries can significantly improve the cycle life, storage stability, safety performance, and rate performance of the battery under high temperature and high pressure conditions.

A functionalized coated separator and lithium-ion battery, by grafting and modifying the polymer backbone PVDF of the coating layer with single-ion conductor lithium salt, effectively constructs a single-lithium-ion conduction ion transport layer at the electrode / electrolyte interface without changing the original function of the coating layer. In lithium-ion battery systems, only lithium ions actually participate in the electrochemical reaction and energy conversion process. The movement of anions in the electrolyte will cause their accumulation on the electrode surface, leading to increased battery polarization and interfacial side reactions. The PVDF coating layer itself can effectively improve the adhesion between the separator and the electrode and the wettability with the electrolyte. By introducing immobilized anionic groups on the PVDF backbone, the functionalization of interfacial single-lithium-ion transport provided by this invention can further optimize the performance of the coating layer, the separator, and the liquid lithium-ion battery.

The invention provides a negative plate as well as a preparation method and application thereof. The negative plate comprises a negative current collector and a negative active coating coated on at least one surface of the negative current collector, the negative electrode active coating comprises composite active particles, sulfide electrolyte and a conductive agent; wherein the composite active particle comprises a core and a coating layer, the core comprises a negative electrode active material, and the coating layer comprises an elastic composite electrolyte; the negative active material comprises a silicon element; the elastic composite electrolyte comprises a nano inorganic electrolyte and a polymer electrolyte. The coating layer of the elastic composite electrolyte is formed on the surface of the negative electrode active material, so that the volume expansion of silicon can be inhibited, the reduction decomposition of sulfide electrolyte is improved, the adhesive strength of the negative electrode active coating can be enhanced, and the lithium ion conduction performance of the negative electrode plate can be enhanced.

A separator for an electrochemical cell has a layer of one or more polymer material, the layer having a thickness, and particles of one or more inorganic material that is lithium-ion conductive. The particles of the lithium-ion conductive inorganic material are embedded within the thickness of the layer of polymer material, each particle having a diameter ranging between 100 nm and 600 nm.

The application discloses a kind of all-solid-state battery its preparation method, and electric device, including: with high-voltage positive active material positive pole piece, with lithium metal negative active material negative pole piece and solid electrolyte film, solid electrolyte film includes the first solid electrolyte layer in contact with negative pole piece, interface modification layer and the second solid electrolyte layer in contact with positive pole piece, the thickness of first solid electrolyte layer is greater than or equal to the thickness of second solid electrolyte layer;Interface modification layer is the interface buffer layer of electronic insulation and lithium ion conduction, and the thermal expansion coefficient is between the thermal expansion coefficient of first solid electrolyte layer and second solid electrolyte layer.The interface compatibility problem is solved by the layered structure of solid electrolyte film disclosed in the application, so as to improve battery safety and cycle life.

The invention discloses a flame-retardant electrolyte, an electrolyte injection process and a lithium ion battery, the flame-retardant electrolyte comprises: a basic electrolyte, the basic electrolyte comprises a lithium salt and an organic solvent; a cross-linking agent, wherein the cross-linking agent is triethylene glycol dimethacrylate; the flame retardant is 1, 3, 3, 5, 5-pentafluoro-1-ethyoxyl-cyclotriphosphazene, and the flame retardant is 1, 3, 3, 5, 5-pentafluoro-1-ethyoxyl-cyclotriphosphazene; the initiator is azodiisobutyronitrile, and the mass ratio of the initiator to the cross-linking agent is 1: (40-50). According to the flame-retardant electrolyte, through the synergistic effect of the flame retardant and the cross-linking agent, combustion free radicals can be captured to interrupt flame propagation, a three-dimensional gel network can be formed to block heat transfer, meanwhile, the lithium ion conduction efficiency and cycling stability are ensured by optimizing the ratio of the initiator to the cross-linking agent, and the balance of battery safety and electrochemical performance is achieved; and the compatibility with the existing lithium ion battery production process is good, and special equipment does not need to be additionally introduced.

The present invention relates to a sulfide solid electrolyte comprising a crystal phase and a glass phase, the glass phase comprising a phase comprising a sulfide-based glass containing Li, P, S, and Ha as constituent elements, the Ha being at least one type selected from F, Cl, Br, and I, the crystal phase comprising a high ion-conducting crystal phase derived from the sulfide-based glass, and the glass phase comprising a phase comprising a sulfide-based glass containing Li, P, S, and Ha as constituent elements. The high ion conduction crystal phase has diffraction peaks at least at 2 [theta] = 20.2 + / -0.5 DEG, 23.8 + / -0.5 DEG, and 29.7 + / -0.5 DEG in an XRD pattern obtained by powder X-ray diffraction measurement, and the half width of the diffraction peak at 2 [theta] = 20.2 + / -0.5 DEG is 0.01-0.4 DEG.

An electrochemical device includes a positive electrode, a negative electrode, a separator, and a lithium-ion conductive electrolyte. The positive electrode includes a positive electrode current collector, and a positive electrode mixture layer. The negative electrode includes a negative electrode current collector, and a negative electrode mixture layer, and the specific surface area of the negative electrode mixture layer is 10 m2 / g-70 m2 / g. The negative electrode mixture layer includes a negative electrode active material, and a binder that binds the negative electrode active material to the negative electrode current collector. The binder contains at least a first component, and may contain a second component. The first component is at least one selected from the group consisting of carboxymethyl cellulose and a carboxymethyl cellulose salt. The ratio of the mass of the second component to the mass of the negative electrode mixture layer is 0%-1%.

The invention provides a phosphorus-oxygen-based additive, a preparation method of the phosphorus-oxygen-based additive, an electrolyte and a lithium battery. The structural formula of the phosphorus-oxygen-based additive is shown in the following general formula (I): (I), X1 is cyano, halogen atoms and C1-C8 alkyl and alkoxy substituted by halogen atoms, alkenyl and alkynyl; x2 has a structure as shown in a general formula (II) in the specification; wherein Y is C, N or O, and R1, R2 and R3 can be independently selected from halogen atoms, C1-C8 alkoxy substituted or unsubstituted by halogen atoms, alkyl, alkenyl, alkynyl or aryl respectively; and X3 is a cyano group, a halogen atom or X2. The phosphorus-oxygen-based additive can solve the problems that high-working-voltage (such as over 4.3 V) interface side reaction is violent and high-load positive electrode lithium ion conduction is limited, and the structural stability and the electrochemical performance of the battery under the high-voltage condition are effectively improved.

The present application relates to a kind of mixed conductor layer coated silicon monoxide negative electrode material, the material includes prelithiated SiO x Material, the surface of the prelithiated SiO x Material has coating layer, and the coating layer structure is the amorphous carbon layer of internal uniform dispersion lithium ion conduction active site.The preparation method of the material includes the following steps: preparation precursor coated SiO x Material: in precursor solution SiO x / C particle is added, using coating process, obtains precursor coated SiO x Material;Configuration chemical prelithiation agent solution;Lithiation reduction: the precursor coated SiO x Material is soaked in prelithiation agent solution, stirring for a period of time under inert atmosphere, then washing and drying, obtain lithiated SiO x Material;Heat treatment: the lithiated SiO x Material is calcined, and then heat preservation, obtains mixed conductor layer coated prelithiated SiO x Material.

The application relates to the technical field of battery negative electrode materials, and discloses a negative electrode material and a preparation method and application thereof. The negative electrode material comprises a base material and a coating layer coated on the outer surface of the base material. The base material comprises a graphite base and a dopant doped in the graphite base, and the dopant comprises CeO2 and Yb2O3. The coating layer comprises Li4CeO3. The space coupling of the layer-expanding effect of CeO2 and the pinning effect of Yb2O3 improves the capacity of a lithium ion battery, guarantees fast charging, and improves the cycle life of the lithium ion battery. The Li4CeO3 coated on the base material has excellent lithium ion conduction capacity, significantly reduces the energy barrier of lithium ions from the electrolyte into the electrode solid surface, and can improve the interface conduction and the cycle life of the lithium ion battery even at low temperature.

The application relates to a composite positive electrode for a solid-state lithium-sulfur battery and a preparation method thereof, and belongs to the field of all-solid-state lithium-sulfur batteries. By introducing an additive rare earth perovskite oxide (LaNiO3, LaCoO3, LaFeO3) into the solid-state lithium-sulfur battery positive electrode, the additive of the application has electronic conductivity, lithium ion conductivity and catalytic activity, accelerates the solid-phase bidirectional conversion of S8-Li2S, and reduces the interface charge transfer energy barrier. Test results show that the composite positive electrode has high specific capacity and cycle stability under high sulfur loading conditions, the discharge capacity at a 0.5C rate is more than 1200 mAh.g ‑1 After 500 cycles, the capacity retention rate is not less than 95%. The method has simple process and can be suitable for various solid-state battery systems, and has important significance for the practicalization of the solid-state lithium-sulfur battery.

The invention relates to the technical field of lithium ion batteries, in particular to a functional binder, a preparation method thereof and a lithium ion battery. The functional binder has a three-dimensional network structure and comprises the following raw material components: a main binder, functional polyurethane and a cross-linking agent, the functional polyurethane contains a heterocyclic group and a functional group, the heterocyclic group contains a hydrogen bond acceptor and a hydrogen bond donor, and the functional group comprises an ion-conducting group and / or an electron-conducting group; the cross-linking agent contains a hydrogen bond donor, a hydrogen bond acceptor and a positive charge group. The main binder has basic bonding performance; functional polyurethane can exert the flexibility and elasticity. The functional polyurethane and the cross-linking agent also form a hydrogen bond complementary pairing mode, so that the cross-linking agent can accurately identify heterocyclic groups on the functional polyurethane, and the bonding strength is high. And the cross-linking agent and the main binder generate an electrostatic adsorption effect. Therefore, the functional binder has relatively high flexibility, elasticity, bonding performance, lithium ion conduction and / or electron conduction performance.

A positive electrode active material and a preparation method therefor, a positive electrode sheet, and a battery. The positive electrode active material satisfies the following formula 1: I1+I2+I3≤10.20, wherein I1 is I(111) / I(311) in the XRD pattern of the positive electrode active material, I2 is I(111) / I(400) in the XRD pattern of the positive electrode active material, I3 is I(111) / I(440) in the XRD pattern of the positive electrode active material, and none of I1, I2 and I3 is equal to 0. In the positive electrode active material, by defining the degrees of exposure of the (110) plane, the (100) plane and the (311) plane by means of formula 1, the lithium ion conduction rate of the positive electrode active material can be increased, and the phenomenon of manganese dissolution can be reduced; therefore, the rate capability and cycling stability of a corresponding battery can be significantly improved.

In a lithium recovery device (1), a treatment tank (7) is divided into three chambers by an ion-conducting membrane (31) and a lithium-ion-conducting electrolyte membrane (2) in the order of chambers (11, 12, 13), a power source (5) is connected between electrodes (41, 42) provided in each of the chambers (11, 13) at both ends with the first electrode chamber (11) side as the positive side, water (S1) is accommodated in the first electrode chamber (11), a non-aqueous Li solution (FS) is accommodated in the Li supply chamber (12), and the lithium ion-conducting electrolyte membrane (2) is arranged in the Li supply chamber (12). An aqueous solution (RS) for Li recovery is accommodated in the Li recovery chamber (13). When a voltage is applied by a power source (5), H + moves from water (S1) through the ion-conducting membrane (31) to the Li-containing non-aqueous solution (FS), and in the Li-containing non-aqueous solution (FS) to which H + is supplied, Li + moves into the lithium-ion-conducting electrolyte membrane (2) and Li + in the lithium-ion-conducting electrolyte membrane (2) moves into the aqueous solution (RS) for Li recovery in order to maintain charge balance.

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises a compound shown in the formula 1, in the formula 1, R1 and R2 independently comprise at least one of fluoro or non-fluoro alkyl with the carbon atom number of 1-5, fluoro or non-fluoro alkenyl with the carbon atom number of 2-5 and fluoro or non-fluoro alkynyl with the carbon atom number of 2-5; and X1 and X2 are respectively and independently selected from alkyl with the carbon atom number of 1-5. According to the electrolyte, by introducing the compound as shown in the formula 1, a positive and negative electrode interface system with high stability and excellent lithium ion conduction performance can be constructed, so that the thermal shock safety and the low-temperature dynamic performance of the battery are synchronously improved.

Disclosed are a composite negative electrode layer, a negative electrode, an all-solid-state battery, and methods for manufacturing the same. In one embodiment, the composite negative electrode layer includes a negative electrode active material and a sulfide-based solid electrolyte. The negative electrode active material includes a negative electrode active material of a core-shell structure including a silicon-containing core and a shell disposed on a surface of the core. The shell includes a lithium-containing compound, and the lithium-containing compound includes at least one of phosphorus and boron. The structure can improve the structural stability and lithium ion conductivity of the negative electrode active material adopting the silicon-based negative electrode material.

The invention provides a composite coated positive electrode material as well as a preparation method and application thereof, and relates to the technical field of solid-state batteries. The composite coated positive electrode material comprises a positive electrode active material with a coating layer, a solid electrolyte and a conductive agent, the positive active material with the coating layer comprises an inner core and a composite interface layer coating the surface of the inner core, wherein the inner core is nickel cobalt lithium manganate, and the composite interface layer comprises cubic boron nitride and titanium dioxide. The cubic boron nitride and titanium dioxide integrated composite coating layer is constructed on the surface of nickel cobalt lithium manganate, so that the obtained composite coated positive electrode material has high chemical inertness, excellent mechanical strength and good lithium ion conduction capability, and synergistic interaction of physical barrier and ion transmission is realized; and the interface stability, cycle life and rate capability of the solid-state battery and the universal compatibility of the solid-state battery to various solid-state electrolytes are remarkably improved.