2632 results about "Conductive polymer" patented technology

The invention relates to the technical field of secondary batteries, in particular to a conductive composite current collector, a preparation method thereof and a battery. The conductive composite current collector comprises a supporting layer, a metal layer arranged on at least one surface of the supporting layer and a PTC (Positive Temperature Coefficient) bottom coating arranged on the surface, far away from the supporting layer, of the metal layer, the supporting layer comprises a polymer base membrane and conductive fibers dispersed in the polymer base membrane; the PTC undercoat layer includes a conductive polymer and a conductive agent dispersed in the conductive polymer. The conductive composite current collector provided by the invention is high in conductivity and excellent in safety, the probability of thermal runaway of the battery at a high temperature is effectively reduced, and the rate capability and the cycle performance of the battery are improved.

The invention provides a preparation method of a bipolar plate of a redox flow battery, which comprises the following steps: adding a coupling agent into resin and graphite powder, so that one end of the coupling agent is wound with the resin, the other end of the coupling agent is chemically crosslinked with the treated graphite powder to form a crosslinked net-shaped three-dimensional structure, and meanwhile, adding a conductive polymer to increase a conductive path between flexible graphite; the high-density graphite paper on the upper side and the lower side of the bipolar plate can prevent electrolyte of the flow battery from entering the bipolar plate, and the situation that the performance of the bipolar plate is reduced due to the fact that resin is in direct contact with the electrolyte is avoided.

The invention belongs to the technical field of polymer heat conduction, and particularly relates to a preparation method of a high-heat-conductivity polymer with modified boron nitride as filler, which comprises the following steps: (1) dissolving boron nitride nanosheets into tetrahydrofuran, ultrasonically dispersing uniformly, adding a modifier for reaction, then removing tetrahydrofuran by using a rotary evaporator, transferring into deionized water, and drying to obtain a boron nitride nano-sheet; drying to obtain a modified boron nitride nanosheet; (2) dispersing carbon nanotubes in deionized water, stirring and carrying out ultrasonic treatment, adding the modified boron nitride nanosheets, and then carrying out freeze orientation treatment and freeze drying treatment to obtain a porous foamed composite heat-conducting filler; and (3) carrying out melt blending on the composite heat-conducting filler and polyethylene glycol terephthalate, and carrying out hot press molding to finally prepare the modified high-heat-conductivity polymer. According to the invention, the composite heat-conducting filler improves the interfacial compatibility and dispersity with a polymer matrix, and reduces the interfacial thermal resistance of the composite material, so that the modified polymer has good application in the aspect of heat dissipation of electronic equipment.

The invention is applicable to the technical field of conductive adhesives, and provides a conductive nanoparticle-doped epoxy resin conductive adhesive which comprises the following raw materials in parts by weight: 0.05-4 parts of conductive metal nanoparticles, 0.03-6 parts of conductive polymer nanoparticles, 45-80 parts of modified flaky silver-coated copper powder, 10-50 parts of epoxy resin, 10-30 parts of a curing agent, 0.001-1 part of an accelerant and 0.2-0.6 part of a modifier. The invention further provides a preparation method of the epoxy resin conductive adhesive doped with the conductive nanoparticles. The invention also provides application of the epoxy resin conductive adhesive doped with the conductive nanoparticles in preparation of a semiconductor packaging material. The conductive metal nanoparticles and the conductive polymer nanoparticles are introduced into the formula of the conductive adhesive in a doping manner, the usage amount of the micron silver coated copper powder can be reduced on the premise of ensuring that the conductive adhesive has good conductivity, and the preparation method is convenient to operate, simple and easy to implement and low in raw material price.

The invention relates to the technical field of solar cells, and provides a laminated cell and a manufacturing method thereof, which are at least beneficial to improving the efficiency of the laminated cell. The laminated cell comprises a crystalline silicon bottom cell, a middle layer and a perovskite top cell which are sequentially laminated in a preset direction, the middle layer comprises a conductive composite layer, the conductive composite layer is located on the surface, facing the perovskite top cell, of the crystalline silicon bottom cell, and materials of the conductive composite layer comprise a conductive polymer and a metal dopant; the metal grid layer is embedded into one side, far away from the crystalline silicon bottom battery, of the conductive composite layer, and the conductive composite layer exposes the surface, far away from the conductive composite layer, of the metal grid layer; the barrier layer is located on the side, away from the composite layer, of the metal grid layer and covers the surfaces of the metal grid layer and the conductive composite layer.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a conductive polymer coated silicon-carbon composite material and a preparation method and application thereof.The conductive polymer coated silicon-carbon composite material comprises a porous silicon-carbon material and a conductive polymer, and the pore width of a porous structure in the conductive polymer coated silicon-carbon composite material is smaller than the in-pore width; the porous silicon carbon material comprises porous carbon and silicon particles, the conductive polymer comprises a polymer frame and a conductive material, the conductive material comprises at least one zero-dimensional conductive substance, at least one one-dimensional conductive substance and at least one two-dimensional conductive substance, and the component content of each conductive substance meets the formula: # imgabs0 # mA is the mass percentage of the component A in the whole system, Pc is the mass percentage of the component B in the whole system, and the component B is the mass percentage of the component B in the whole system. A is the mass fraction percolation threshold of the component A in the polymer framework. According to the invention, not only can a screening type structure be effectively constructed, but also the rate capability can be greatly improved, and finally the silicon-carbon composite material with high initial efficiency, low expansion, high cycle stability and excellent fast charging performance is obtained.

The invention relates to a composite positive active material and a preparation method thereof, a positive pole piece and a secondary battery. The composite positive electrode active material comprises a positive electrode active material substrate, a porous metal oxide coating layer arranged on the surface of the positive electrode active material substrate and a conductive polymer coating layer arranged on the surface of the porous metal oxide coating layer. In the composite positive electrode active material, the electrochemical inert porous metal oxide coating layer has good thermal stability and is beneficial to stabilization of a crystal structure and inhibition of surface side reaction, and in addition, the porous structure is beneficial to transmission of lithium ions and storage of oxygen free radicals separated out due to structural collapse of a positive electrode active material matrix in the overcharge process; severe reaction with electrolyte is relieved, and overcharge failure of the positive electrode active material is slowed down. The conductive polymer coating layer can make up the electrochemical inertness of the metal oxide and improve the electronic conductivity of the positive electrode active material.

The invention provides a lithium manganese iron phosphate material as well as a preparation method and application thereof. The lithium manganese iron phosphate material sequentially comprises a lithium manganese iron phosphate matrix inner core, a first coating layer and a second coating layer from inside to outside, the first coating layer comprises a carbon material, the second coating layer comprises a composite material, and the composite material comprises carbon nitride and a conductive polymer. Through doping and coating of the carbon material in the first coating layer and synergistic cooperation of the conductive polymer and the carbon nitride in the second coating layer, the conductivity of the lithium manganese iron phosphate material is improved, and the cycling stability, the capacity and the rate capability of the lithium manganese iron phosphate material are improved.

The invention provides a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The silicon-carbon negative electrode material comprises a porous carbon substrate, nano silicon deposited on the surface and in pores of the porous carbon substrate, and a conductive polymer layer coated on the surface of the nano silicon, the porous carbon matrix is formed by taking zinc gluconate as a carbon source through high-temperature pyrolysis and carbonization. According to the silicon-carbon negative electrode material, the preparation method thereof and the lithium ion battery provided by the invention, the silicon-carbon negative electrode material has high specific surface area, excellent conductivity and stable cycle performance, and shows excellent cycle stability and relatively high reversible capacity in the charge-discharge process when being used for the lithium ion battery; the energy density and the cycle life of the lithium ion battery are effectively improved, a new technical approach is provided for preparation of the silicon negative electrode material of the lithium ion battery, and the preparation method has a wide application prospect.

The present invention belongs to the technical field of electrolytic copper foil. The present invention provides an electrolyte for ultra-thin electrolytic copper foil, in which the mass concentration of copper sulfate is 175-260 g / L, the mass concentration of inorganic acid is 80-100 g / L, the mass concentration of additive is 1-5 g / L, the mass concentration of complexing agent is 3-8 g / L, the mass concentration of conductive polymer is 0.5-3 g / L, and the mass concentration of hydrolyzed collagen is 0.1-0.5 g / L. The present invention also provides an ultra-thin electrolytic copper foil and a preparation method thereof. The present invention significantly reduces the thickness and roughness of the copper foil by controlling the components of the electrolyte and their concentrations and the electrodeposition process parameters, while improving the mechanical properties, antioxidant properties and electrochemical properties of the copper foil. The ultra-thin copper foil of the present invention can be produced continuously without tearing, achieving a double breakthrough in the ultra-thin thickness and mechanical properties of the copper foil.

The invention discloses a catalyst layer for a fuel cell and a preparation method thereof, the catalyst layer comprises an anode catalyst and a cathode catalyst, the anode catalyst layer comprises a Pt-C catalyst, high dielectric micromolecular alcohol, sulfonated lignin doped conductive polymer nanoparticles, a hydrophilic adhesive, an ionomer solution and deionized water; the cathode catalyst layer comprises a catalyst, an ionomer solution, high-dielectric micromolecular alcohol, polytetrafluoroethylene and deionized water; the technical problems that an existing catalyst layer for a fuel cell is poor in water management effect, and an adopted water management material is poor in conductivity can be solved. The preparation method is simple and convenient, and the preparation difficulty and the operation difficulty of operators are greatly reduced.

The present invention discloses a self-supporting flexible carbon material and its preparation method and application. It comprises the following steps: (1) using carbon felt as a working electrode and a counter electrode respectively, applying electricity in an electrolyte for 2 to 10 minutes, washing and drying, and obtaining an electrochemically stripped carbon felt; (2) using a mixture of nitrogen-containing conductive polymer monomers and alkaline solution as an electrolyte, and using the carbon felt treated in step (1) as a working electrode to construct a three-electrode system for electrochemical treatment, washing and drying, and obtaining a carbon felt loaded with a nitrogen-containing conductive polymer; (3) heat treating the carbon felt obtained in step (2) at 800 to 900°C in a protective gas atmosphere for 1 to 2 hours, cooling to room temperature, and then washing and drying. The present invention can simultaneously complete the two steps of element doping and activation through a one-step high-temperature process, and the prepared flexible carbon material has excellent electrochemical properties.

The invention discloses bamboo composite rubber for shoe soles and a preparation method thereof, and relates to the technical field of rubber products, the bamboo composite rubber comprises the following specific components: natural rubber, bamboo powder, polyurethane, a silane coupling agent, a plasticizer, an anti-ultraviolet agent and an antibacterial agent, and a rubber matrix is formed; the bamboo composite rubber for the shoe sole further comprises additives, and the additives comprise hyperelastic nanoparticles, an environment-friendly water-based coating, a wear-resistant reinforcing agent, a heat-conducting polymer, a negative ion release material, bamboo charcoal fibers and odor-resistant molecules. According to the bamboo composite rubber for the shoe sole and the preparation method of the bamboo composite rubber, through dual surface modification of the silane coupling agent and the negative ion release material, the bonding force of the bamboo powder and a rubber matrix is remarkably improved, and the composite material has higher mechanical strength and durability. Meanwhile, due to the synergistic effect of the hyperelastic nanoparticles, the heat-conducting polymer and the wear-resistant enhancer, the sole material not only has excellent elasticity and wear resistance, but also has heat-conducting and comfort-adjusting functions.

The invention discloses a method for synthesizing an n-type conductive conjugated polymer and screening a catalyst, and belongs to the technical field of synthesis of conductive polymer materials. Redox potentials of various metal compounds are studied, the screening method of the catalyst in synthesis of the n-type conductive conjugated polymer is provided, and the n-type conductive conjugated polymer such as poly (benzodifuran diketone) (PBFDO) is efficiently synthesized by introducing a trace and cheap metal compound as the catalyst. The method has the advantages that the problem that a large amount of catalyst is left in a conventional synthesis method is solved, the operation is simple, the conductivity of the synthesized PBFDO exceeds # imgabs0 #, the problem that most n-type organic conductive polymers are low in conductivity is solved, high-performance conductivity matched with p-type organic conductive polymers can be realized, and the method can be widely applied to various organic functional materials and organic electronic devices.

The invention belongs to the technical field of aerogel, and particularly relates to high-conductivity aerogel powder as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly preparing a graphene / polypyrrole nanosheet composite material with a three-dimensional structure, and then preparing the polyimide / graphene / polypyrrole ternary hybrid conductive aerogel by taking a polyamide acid solution as a precursor through a solution dipping and freeze drying process. Polyimide is used as a framework of high-conductivity aerogel powder, excellent mechanical strength and structural integrity are provided, the common brittleness problem of a pure graphene carbon material or polypyrrole conductive polymer aerogel is solved, and the three-dimensional graphene / polypyrrole nanosheet composite material has excellent elasticity and toughness and can be used for preparing a composite material with high conductivity. The polyimide aerogel prepared by the method can be dispersed in a polyimide matrix as a nano reinforcement, can effectively transfer stress and prevent crack propagation, and endows the aerogel with higher mechanical properties.

The invention discloses a preparation method and application of three-dimensional intercalation multidirectional conductive MXene-based aerogel, and relates to the technical field of advanced electrochemical energy storage materials and devices. According to the MXene / conductive polymer and nanofiber composite aerogel developed by the invention, the two-dimensional conductive material, the pseudocapacitance polymer and the high-performance nanofiber are integrated in a three-in-one manner, so that collaborative optimization of conductivity, the number of active sites and structural stability is realized, and inherent defects of a single-component material are fundamentally avoided; and a universal solution is provided for solving the industrial problem of unbalanced performance of the electrode material.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a carbon grid derived multi-layer composite bipolar plate for a vanadium battery and a preparation method of the carbon grid derived multi-layer composite bipolar plate for the vanadium battery. The preparation method comprises the following steps: brushing a mixed slurry 1 prepared from a conductive filler, a binder and the like onto the surface to obtain preliminarily modified carbon fibers, then brushing a mixed slurry 2 prepared from oxide nanoparticles, conductive macromolecules and the like onto two surfaces of the preliminarily modified carbon fibers, drying, and repeating the two brushing and drying steps to obtain multi-layer conductive support layer modified carbon fibers; graphite paper is attached to the obtained carbon fibers, and then hot pressing treatment is performed to obtain the carbon conductive grid derived multi-layer composite bipolar plate. According to the prepared multi-layer composite bipolar plate, the etched carbon fiber is used as a substrate, beneficial mechanical strength and conductive grids are provided through stacking of the multiple layers of conductive coatings, the stability and conductivity of the bipolar plate are effectively improved, and therefore the efficiency of a vanadium battery is improved.

The invention provides a comprehensive shielding signal cable and a manufacturing method thereof.The comprehensive shielding signal cable comprises a cable core and a protective layer wrapping the cable core, and the protective layer sequentially comprises a composite shielding layer and an outer sheath layer from inside to outside; the composite shielding layer comprises an iron-based amorphous nanocrystalline alloy layer, a 3D woven mesh layer and a conductive polymer coating which are sequentially arranged on the outer side of the cable core from inside to outside; through the gradient composite structure of the iron-based amorphous nanocrystalline alloy layer (low-frequency magnetic shielding), the 3D woven mesh layer (medium-frequency electromagnetic shielding) and the conductive polymer coating (high-frequency electric field shielding), the full-band shielding effectiveness is realized for the first time, meanwhile, the return loss is greatly reduced, the electromagnetic transmission performance and reliability of the cable are improved, and the service life of the cable is prolonged. And the structural stability of the cable is improved.

The present invention relates to a positive electrode material, the positive electrode material comprises a lithium manganese iron phosphate core, and a conductive polymer layer and a carbon coating layer sequentially coating the surface of the core, and the carbon coating layer comprises a metal organic framework (MOF) and a carbon nanotube (CNT). The positive electrode material is stable in structure, manganese ions can be effectively prevented from being dissolved out, the conductivity of the material is improved, the capacity, the rate capability and the cycling stability of the modified lithium manganese iron phosphate material are improved, and the positive electrode material has great industrial application value.

The invention relates to a high-stability electrode for electrochemical lithium extraction and a preparation method thereof, belongs to the technical field of lithium resource extraction, and is used for solving at least one of the problems of poor cycling stability, low current density, low current efficiency and the like of an electrode prepared by an existing method. According to the electrode, the surface of the active material is coated with the solid electrolyte, the coating layer can effectively avoid direct contact between brine and the active material, side reaction is prevented, and therefore the cycle stability of the electrode is improved. The solid electrolyte layer has the effect of transmitting lithium ions, so that foreign ions can be intercepted, and the selectivity of the electrode to the lithium ions is improved. The active material is also coated with an organic conductive polymer, the electronic conductivity of the active material can be effectively improved by the organic conductive polymer layer, the charge transfer impedance of the active material is reduced, and high-current-density lithium extraction is realized.

The invention provides an organic functional group modified silicon negative electrode material as well as a preparation method and application thereof, and belongs to the field of battery negative electrode materials. The method comprises the following steps: pre-hydrolyzing a silane coupling agent to obtain a mixed solution; adding a silicon material into the mixed solution to bond a silane coupling agent on the surface of the silicon material to obtain an intermediate; and performing in-situ polymerization on the intermediate, a polymer monomer and an initiator to form a conductive polymer on the surface of the intermediate, thereby obtaining the silicon negative electrode material. The preparation method comprises the following steps: firstly, carrying out condensation reaction on a hydrolyzable functional group of a silane coupling agent and silicon hydroxyl on the surface of the photovoltaic silicon waste after hydrolysis to form chemical bonding; meanwhile, non-hydrolytic functional groups in the silane coupling agent are partially retained on the surfaces of the silicon particles, so that polymerization sites are provided for subsequent polymerization reaction; and then modification of different organic functional groups is realized through simple in-situ polymerization, so that a confinement effect and stress dissipation in a particle expansion process are realized, and huge volume expansion of the silicon particles is relieved.

A method for producing a conductive polymer dispersion, the method comprising a step for adding an electric conductivity improving agent to a dispersion that contains a conjugated conductive polymer and a polyanion and dispersing the same, wherein the step is performed at a liquid temperature of 30°C or higher.

To provide a thin film capacitor having a large capacitance. A thin film capacitor includes a metal foil having roughened main surfaces, a dielectric film covering the main surfaces, an electrode layer contacting the metal foil through an opening formed in the dielectric film and having a surface formed as a metal terminal, an electrode layer contacting the dielectric film without contacting the metal foil and having a surface formed as a metal terminal, and an electrode layer contacting the dielectric film without contacting the metal foil. The electrode layers include a conductive polymer layer contacting the dielectric film.

The invention discloses a high-thermal-conductivity polymer shaped composite phase change material and a preparation method thereof. The high-thermal-conductivity polymer shaped composite phase change material comprises macromolecular resin, a processing aid, a thermal conductive filler, an organic phase change material, a modifier, an initiator, an emulsifier, a dispersant and a catalyst. According to the invention, expanded graphite is used as a heat-conducting reinforcing agent, high-density polyethylene is used as a carrier, paraffin is used as a phase-change material, a melt blending method, an in-situ polymerization method and a hot press molding process are adopted to prepare a microencapsulated HDPE shaped paraffin composite material, the HDPE shaped paraffin composite material is completely encapsulated in a polymer film, so that the core material is completely coated, and the heat-conducting property of the core material is improved. According to the present invention, the microcapsule is prepared by using a chemical bond, and is tightly combined with the surface of the core material through the chemical bond so as to improve the stability and the durability of the microcapsule, such that the microcapsule can prevent leakage and improve the thermal conductivity, such that the microcapsule can maintain the stable performance in the multiple phase change cycles, and the microcapsule has good fluidity and good dispersion so as to be conveniently processed and applied in various base materials.

The invention relates to the technical field of rust-proof treatment of metal products, in particular to a rust-proof discoloration-proof packaging system and method for a bronze-plated tire bead wire. The system sequentially comprises a cleaning unit, a surface treatment unit, a drying box, a film coating device, a cooling unit, a post-treatment unit, a take-up device and a packaging system according to the process. The core of the process method is as follows: the steel wire is immediately coated with a special antirust film coating agent to be cured by using waste heat generated after the steel wire is dried, and the film coating agent comprises water-based resin, a silane coupling agent, a conductive polymer, a nano filler and benzotriazole; during packaging, an intelligent packaging system with a built-in humidity response humidity control bag is adopted, and the humidity control bag can automatically release inert gas and a moisture absorbent when the environment humidity reaches a preset threshold value. Multiple synergistic protection on the surface of the steel wire is achieved, the anti-rust period is remarkably prolonged to 12 months or above through dynamic humidity control, meanwhile, the bonding performance and the retention rate of the steel wire and rubber are improved, and energy conservation and environment protection are achieved.

The present disclosure relates to fuel cells comprising composite catalytic material comprising (N-doped) carbon nanofoam, catalytic metal and an electrically conductive material comprising an electrically conductive polymer. The fuel cells can advantageously operate at lower temperatures than standard fuel cells.

The embodiment of the invention provides an energy storage device with conductive polymer sponge and an intelligent monitoring system of the energy storage device, and belongs to the field of electrochemistry, the energy storage device comprises a shell, and an electrode assembly, electrolyte and a current collector which are arranged in the shell; the electrode assembly comprises a positive electrode, a negative electrode and a diaphragm arranged between the positive electrode and the negative electrode, and the positive electrode and the negative electrode are composite electrodes of conductive polymer sponge; the conductive polymer sponge is a polymer sponge which is prepared through an in-situ chemical oxidation polymerization technology and has a porous network, and the energy storage device further comprises a control system used for controlling the operation state of the energy storage device. According to the embodiment of the invention, the polymer sponge with a highly interconnected porous network is prepared through an in-situ chemical oxidation polymerization technology on the basis of a unique microstructure of the conductive polymer sponge, and the three-dimensional structure of the polymer sponge increases the effective surface area of an electrode and improves electrochemical reaction active sites, so that more efficient charge transmission and storage are realized.

The invention discloses an electromagnetic shielding method for a high-density integrated wireless audio module, and the method comprises the steps: employing a metal material with good conductivity and corrosion resistance, such as aluminum alloy and copper alloy, to cover the outer surface of the module, and enabling the outer metal shielding layer to be used for isolating external electromagnetic interference; the thickness of the outer metal shielding layer is generally 0.3 mm to 1 mm, it is ensured that external electromagnetic radiation can be effectively reflected or absorbed, and the outer metal shielding layer is located between the outer metal shielding layer and the inner conductive coating and is made of a material with high-frequency absorption performance, such as a ferrite material, a conductive polymer or a carbon-based material. The thickness of the wave-absorbing layer can be designed according to the electromagnetic characteristics of a working frequency band and is generally 0.5 mm to 2 mm, so that high-frequency noise can be effectively attenuated. By adopting a multi-layer shielding structure and an intelligent heat dissipation design, electromagnetic interference is effectively reduced, miniaturization and light weight of the wireless audio module are maintained, and compared with the prior art in which a large number of expensive shielding materials are needed, the wireless audio module has the advantages that the selection of the shielding materials and the intelligent heat dissipation design are optimized.

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 relates to the technical field of lithium ion battery negative electrode materials, in particular to a coating modification method of a negative electrode material, the negative electrode material and application of the negative electrode material, and the negative electrode material sequentially comprises a silicon core, a gradient interface layer, a self-repairing elastic layer and a hierarchical porous carbon skeleton from inside to outside; the gradient interface layer coats the surface of the silicon core and sequentially comprises an amino silane coupling agent modification layer and a conductive polymer layer from inside to outside; the self-repairing elastic layer covers the outer side of the gradient interface layer and comprises a dynamic covalent bond cross-linked network; the hierarchical porous carbon skeleton coats the outer side of the self-repairing elastic layer, a strongly-combined gradient interface layer is firstly constructed on a silicon core through hydroxylation, amino silane coupling and conducting polymer in-situ polymerization, then a reversible cross-linked network is formed outside the gradient interface layer based on Diels-Alder dynamic covalent bonds, and in-situ crack repairing is achieved. And finally, biomass carbon and CVD carbon nanotubes are compounded, and a micropore / mesopore synergistic conductive buffer structure is formed outside the reversible cross-linked network, so that the cycling stability of the battery is improved.