64results about How to "Small volume expansion" patented technology

The invention relates to the technical field of batteries, in particular to a negative active material, a negative plate comprising the negative active material and a battery. The negative electrode active material comprises silicon-carbon composite particles, wherein the silicon-carbon composite particles comprise a porous carbon material and silicon; according to an XRD diffraction pattern of the negative electrode active material, a first diffraction peak exists when 2 theta is 20-30 degrees, and a second diffraction peak exists when 2 theta is 40-50 degrees; the half-peak width of the first diffraction peak is 1-5 degrees, and the half-peak width of the second diffraction peak is 3-10 degrees; the intensity I1 of the first diffraction peak and the intensity I2 of the second diffraction peak meet the condition that I1 / I2 is greater than or equal to 3. The porous carbon material in the negative electrode active material disclosed by the invention has relatively high strength and structural stability, so that the volume expansion of silicon can be effectively improved and the structural stability of the negative electrode active material can be improved while relatively high gram volume of the negative electrode active material is ensured. Comprising the negative electrode active material has relatively high first coulombic efficiency and cycling stability and relatively low cycling expansion rate.

The invention provides an Mxene-iron molybdenum bimetallic sulfide and carbon composite material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and is used for solving the technical problems of poor conductivity and rate capability of a metal sulfide negative electrode material. The preparation method of the Mxene-iron-molybdenum bimetallic sulfide and carbon composite material comprises the following steps: dissolving an iron source, a molybdenum source and a carbon source in a solvent to prepare a mixed solution; then carrying out a hydrothermal reaction to prepare a bimetallic oxide nanosphere; the bimetallic oxide nanospheres are subjected to high-temperature vulcanization treatment, and iron-molybdenum bimetallic sulfide carbon is prepared; the preparation method comprises the following steps: mixing Mxene and iron-molybdenum bimetallic sulfide and carbon through ball milling to prepare the Mxene-iron-molybdenum bimetallic sulfide and carbon composite material. The composite material disclosed by the invention can realize efficient electron transmission and provide more active sites, and is beneficial to the electrochemical reaction of the battery; the mechanical stability of the material can be enhanced, the volume expansion in the charging and discharging process is effectively reduced, the particle diffusion path between positive and negative electrodes is shortened, and the reaction kinetics of the electrode is improved; and the conductivity and the rate capability of the material can be effectively improved, so that the comprehensive performance of the sodium-ion battery is improved.

The invention discloses a high-first-efficiency dry pre-lithiation silicon-based negative electrode and a preparation method thereof. Comprising the following steps: (1) mixing a negative electrode active material and a pre-lithiation reagent at a high speed to obtain a dry-process pre-lithiated silicon-based negative electrode material; and (2) mixing and fiberizing the pre-lithiated silicon-based negative electrode material, a binder and a conductive agent, pressing the fiberized material into a fiberized film through high-temperature rolling, and finally compounding the obtained fiberized film with a current collector through hot rolling to form the dry-method electrode plate. On one hand, the physical contact between a lithiation reagent and a silicon material can be adjusted in a high-speed mixing process in a dry pre-lithiation manner, and pre-lithiation is induced by utilizing the pressure generated by a contact point; and on the other hand, the pre-lithiation reagent is added in the material mixing process, so that the initial coulombic efficiency of the negative plate can be improved by compensating the loss of active lithium in the reaction process.

The invention relates to the technical field of lithium batteries, and provides a lithium ion secondary battery. In the lithium ion secondary battery, a negative plate comprises a negative active material, and the negative active material comprises a carbon material and a silicon material; the silicon material comprises a silicon-carbon composite material; based on the total mass of the negative electrode active material, the mass percentage content of the silicon-carbon composite material is recorded as b; the ratio of the mass percentage content x of the silicon element in the first region of the silicon-carbon composite material to the mass percentage content y of the silicon element in the second region is marked as B, and B is more than 0 and less than 1; the electrolyte comprises lithium bis (fluorosulfonyl) imide and fluoroethylene carbonate; on the basis of the total mass of the electrolyte, the mass percentage content of the lithium bis (fluorosulfonyl) imide is recorded as m1, and the mass percentage content of the fluoroethylene carbonate is recorded as m2; and when B, b, m1 and m2 meet the relational expression [(m1 + m2) / B] * b > = 0.2, the battery can give consideration to high energy density, low thickness swelling rate and rapid charging capability.

The invention relates to the technical field of batteries, in particular to a negative active material, a negative plate comprising the negative active material and a battery. The negative electrode active material comprises silicon-carbon composite particles; the silicon-carbon composite particles have closed pores, and the volume ratio of the closed pores is 4-50%; the silicon-carbon composite particle has a core-shell structure, and the shell thickness of the core-shell structure is t, 0 lt; t < = 10 nm; the cross section of each silicon-carbon composite particle is provided with a first region and a second region, the content of a silicon element in the first region is c1, the content of a silicon element in the second region is c2, and 0.15 < = c2 / c1 < = 1.4; wherein the size of a vertical line of a tangent line of any point on the edge of the cross section on the cross section is L, on the vertical line, an area which is 0.001 L-0. 1L away from the edge of the cross section forms a first area, and an area which is 0.1 L-0. 5L away from the edge of the cross section forms a second area. The battery provided by the invention can give consideration to relatively high energy density, first coulombic efficiency, rate capability and cycling stability.

The invention discloses porous carbon and a preparation method and application thereof, and the preparation method of the porous carbon comprises the following steps: S1, mixing resin and electrolyte in a solvent, and carrying out spray drying to obtain a porous carbon precursor; s2, pre-carbonizing the porous carbon precursor, and activating the porous carbon precursor by using water vapor to obtain porous carbon; in the step S1, the mass ratio of the resin to the electrolyte is 100: (0.1-5); in the step S2, the activation temperature is 500 to 1200 DEG C. According to the preparation method of the porous carbon, by controlling the mass ratio of the resin to the electrolyte and the activation temperature of the water vapor, the interface condition of the nano silicon-carbon negative electrode material prepared from the porous carbon is improved, generation of a new SEI film is inhibited, the capacity retention rate of the nano silicon-carbon negative electrode material prepared from the porous carbon is increased, and the service life of the nano silicon-carbon negative electrode material is prolonged. And the volume expansion of the nano silicon-carbon negative electrode material during charging and discharging is reduced.

The invention discloses a positive electrode active material, a secondary battery and a power utilization device, and belongs to the technical field of batteries, the positive electrode active material comprises a core material and a carbon coating layer arranged on the outer surface of the core material, the core material comprises a positive electrode material and boron oxide, the boron oxide is at least partially distributed among pores of the positive electrode material, and meanwhile, the positive electrode material contains the manganese-iron-lithium oxide with specific doping elements, so that the lithium ion secondary battery has stable electrochemical capability in a high-temperature and high-voltage state, and therefore, the cycling stability can be effectively improved, the internal resistance can be reduced, gas production can be inhibited, and the service life of the lithium ion secondary battery can be prolonged. The volume expansion rate is reduced.

The invention belongs to the technical field of battery negative electrode materials, and particularly relates to a phosphorus-based negative electrode material with a coating structure as well as a preparation method and application of the phosphorus-based negative electrode material. On the basis of the prior art, nano nickel phosphide, red phosphorus and carbon nanospheres are subjected to ball milling to prepare a main body phosphorus-based material, and then the main body phosphorus-based material is coated with a coating layer prepared from a nanofiber material, pyrrole and 5-azaindole, so that the coating layer of the phosphorus-based negative electrode material has elasticity, the volume expansion rate of the phosphorus negative electrode material is reduced, and the service life of the phosphorus negative electrode material is prolonged. According to the nickel phosphide-based negative electrode material and the preparation method thereof, the interface interaction between the phosphorus-based negative electrode material and the binder is enhanced, the prepared nickel phosphide grows on the black phosphorus nanosheet, so that the nickel phosphide has good dispersity, the nickel phosphide nanocrystals can be effectively prevented from being agglomerated, and the energy storage capacity of the nickel phosphide is improved; and after the 5-hydroxy vanillin is grafted, the adhesive has excellent wet adhesion resistance, and can prevent the dissolution of phosphorus element, so that the cycle efficiency of the electrode is improved.

The invention discloses a silicon-carbon composite material and a preparation method thereof, a negative plate, an electrochemical device and electronic equipment. The silicon-carbon composite material comprises a graphite carrier, metal particles, silicon particles and a carbon coating layer, and the metal particles are distributed on the surface of the graphite carrier; the silicon particles cover the surfaces of the metal particles; the carbon coating layer covers the surfaces of the silicon particles, and is filled in gaps among the silicon particles to be in contact with the surface of the graphite carrier; wherein based on the total mass of the silicon-carbon composite material, the mass content of the metal particles is 0.01-10 wt.%; the mass content of the silicon particles is 0.2 wt%-30 wt%; wherein the particle size of the silicon particles is 1 to 1000 nm. The silicon-carbon negative electrode material provided by the invention has good conductivity, and can effectively improve the fast charge performance and cycle performance of the battery.

The invention relates to the technical field of batteries, in particular to a porous carbon and silicon carbon negative electrode material and a preparation method and application thereof. The invention provides porous carbon, the porous carbon comprises micropores, the percentage of the pore volume of the micropores in the total pore volume is greater than or equal to 85%, and in a pore distribution curve with the abscissa being the pore diameter and the ordinate being the differential pore volume dV / dW obtained by a nitrogen adsorption method test, the differential pore volume dV / dW of the porous carbon is greater than 0.05 cm < 3 >. G <-1 >. Nm <-1 > within the pore diameter range of 1-2 nm. The porous carbon has proper microporosity and pore size distribution in Koelreuteria-shaped distribution, can effectively improve the silicon loading efficiency, reserves a part of space for volume enlargement caused by silicon expansion in the nanometer silicon circulation process, has the effect of relieving volume expansion when lithium is embedded into silicon, can reduce the volume expansion rate of the silicon-based negative electrode material, and improves the silicon-based negative electrode material performance. The cycling stability of the battery is improved.

The invention provides a silicon-based negative electrode material which comprises a silicon-based inner core and a coating layer coating the silicon-based inner core, the coating layer is made of a carbon material and a fast ion conductor, and the mass content of the fast ion conductor in the coating layer is gradually increased in the direction from the silicon-based inner core to the coating layer. The silicon-based negative electrode material is excellent in ionic conductivity and electronic conductivity, stable in structure and beneficial to being used in a negative electrode. The invention also provides a preparation method of the silicon-based negative electrode material, a negative electrode, a battery and electric equipment.

The invention discloses an electrochemical device and electronic equipment, the electrochemical device comprises a negative electrode piece and an electrolyte, the negative electrode piece comprises a negative electrode active material, the negative electrode active material contains a silicon-based material, based on the mass of the negative electrode active material, the mass percentage content of a silicon element in the silicon-based material is Z1%, 0.1 < Z1 < 15, the electrolyte comprises a compound shown in a formula I and a substance A, the substance A is selected from at least one of ethylene sulfite, ethylene sulfate, vinyl ethylene sulfite, trifluoromethyl phenyl sulfide or methylene methanedisulfonate, based on the mass of the electrolyte, the mass percentage content of the compound shown in the formula I is a%, the mass percentage content of the substance A is b%, a / b is larger than or equal to 0.5 and smaller than or equal to 20, and a is larger than or equal to 0.5 and smaller than or equal to 20. The electrochemical device provided by the invention has relatively small volume expansion and relatively low impedance increase in a normal-temperature cycle process.

The invention relates to the technical field of batteries, in particular to a negative active material, a negative plate comprising the negative active material and a battery. The negative electrode active material comprises silicon-carbon composite particles; the particle size Dn10 of the silicon-carbon composite particles is 1-8 [mu] m; the average sphericity degree of the silicon-carbon composite particles is 0.6-1; the silicon-carbon composite particles have closed pores and open pores, and the volume V1 of the closed pores and the volume V2 of the open pores satisfy 0.2 < = V1 / V2 < = 2000. The negative electrode active material disclosed by the invention has relatively high ionic conductivity and electronic conductivity and relatively high structural stability while relatively high gram volume is ensured. Comprising the negative electrode active material disclosed by the invention can give consideration to relatively good initial coulombic efficiency, rate capability, low-temperature performance and cycling stability.

The invention discloses a silicon-carbon negative electrode material prepared based on biomass hard carbon as well as a preparation method and application of the silicon-carbon negative electrode material. The preparation method comprises the following steps: immersing hard carbon into an acid I solution, heating to 60-80 DEG C, preserving heat for 10-24 hours, filtering, and washing to be neutral to obtain activated hard carbon; dipping the activated hard carbon in a silicon source aqueous solution system for 6-8 hours, and filtering; leaching the filtered hard carbon adsorption material with an acid II solution, soaking the material in an acid III solution containing a dispersing agent for 2-4 hours, filtering, and washing with water until the material is neutral and the content of metal ions is less than 50 ppm, so as to prepare the in-situ acidified hard carbon material for adsorbing the silicon source; and carrying out gradient heating to 1200-1600 DEG C in an inert gas and hydrogen atmosphere, carrying out heat preservation, cooling, and grinding to obtain the biomass hard carbon silicon carbon negative electrode material. According to the invention, the biomass hard carbon which is cheap and easy to obtain and cannot be graphitized at a high temperature is used as a carrier and is impregnated in the silicon source dilute solution at a low temperature, and the silicon-carbon negative electrode material prepared from the biomass hard carbon is prepared through in-situ reduction and is applied to a lithium battery, so that the working efficiency and the safety performance of the battery are improved.

The application relates to a silicon-carbon composite material and a preparation method thereof, a negative active material, a negative electrode sheet, a secondary battery and an electric device. The silicon-carbon composite material comprises porous carbon and a zinc silicate-silicon-oxygen-carbon composite material; at least part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon; the zinc silicate-silicon-oxygen-carbon composite material is of a porous structure; the pore diameter of the zinc silicate-silicon-oxygen-carbon composite material is 1-5 nm; and the mass content of zinc elements in the zinc silicate-silicon-oxygen-carbon composite material is 1-6%. The zinc silicate-silicon-oxygen-carbon composite material has proper pore diameter and zinc element content, is good in structural stability, and has low volume expansion rate and good conductivity. Since part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon, the volume expansion of the silicon-carbon composite material is further buffered. In the electrochemical cycle process, the silicon-carbon composite material has low volume expansion, and the cycle stability of the secondary battery can be improved.

The application provides a positive electrode material and a preparation method and application thereof. The positive electrode material is indicated by a gas generation index of the positive electrode material obtained based on a cumulative particle size distribution change rate of the positive electrode material after being pressed under different pressures. The positive electrode material has good structural stability and particle pressure strength, is not easy to break, can reduce the volume expansion of a battery, and improves the performance of the battery.

The invention relates to the technical field, and provides a phenolic resin / sucrose-based hard carbon material preparation method and material.The phenolic resin / sucrose-based hard carbon material preparation method comprises the steps that phenolic resin and N, N-dimethylformamide are adopted according to the proportion to prepare a solution A, sucrose, hexamethylenetetramine and deionized water are adopted according to the proportion to prepare a solution B, and the solution B is prepared into a phenolic resin / sucrose-based hard carbon material; adding the solution B into the solution A according to the proportion to prepare a phenolic resin / sucrose-based hard carbon precursor solution; placing the prepared phenolic resin / sucrose-based hard carbon precursor solution in a reaction kettle for solvothermal reaction, and cleaning and drying a solvothermal reaction product to prepare a phenolic resin / sucrose-based hard carbon precursor; grinding the prepared phenolic resin / sucrose-based hard carbon precursor, carrying out pre-oxidation treatment on a grinding product, and carrying out carbonization treatment on a product subjected to the pre-oxidation treatment, so as to prepare the phenolic resin / sucrose-based hard carbon material. The phenolic resin / sucrose-based hard carbon material with stable structure and excellent electrochemical performance can be efficiently prepared at low cost.

The embodiment of the present application relates to a kind of porous silicon-carbon composite material and its preparation method and application, the porous silicon-carbon composite material includes: porous silicon-carbon matrix, including as porous carbon matrix of porous carbon skeleton and the nano-silicon layer deposited on the outer surface and internal pore wall of porous carbon skeleton;Nano-fiber mesh passivation layer is the three-dimensional mesh structure that inorganic nano-fiber interweaves and overlaps each other;Nano-fiber mesh passivation layer is coated on the outer surface of porous silicon-carbon matrix, and / or in the internal pore of porous silicon-carbon matrix, to form passivation protection to nano-silicon layer;Carbon coating layer, coated on the outer surface of porous silicon-carbon matrix;Wherein, carbon coating layer at the outer surface of porous silicon-carbon matrix constitutes the outermost layer of porous silicon-carbon composite material.The porous silicon-carbon composite material is applied to lithium ion battery negative electrode, with the characteristics of high initial coulomb efficiency, low expansion rate.

The invention relates to the technical field of batteries, in particular to porous carbon. The invention provides porous carbon, the porous carbon comprises micropores, the percentage of the pore volume of the micropores in the total pore volume is greater than or equal to 85%, and in a pore distribution curve with the abscissa being the pore diameter and the ordinate being the differential pore volume dV / dW obtained by a nitrogen adsorption method test, the differential pore volume dV / dW of the porous carbon is greater than 0.05 cm < 3 >. G <-1 >. Nm <-1 > within the pore diameter range of 1-2nm. The porous carbon has proper microporosity and pore size distribution in Koelreuteria-shaped distribution, can effectively improve the silicon loading efficiency, reserves a part of space for volume enlargement caused by silicon expansion in the nanometer silicon circulation process, has the effect of relieving volume expansion when lithium is embedded into silicon, can reduce the volume expansion rate of the silicon-based negative electrode material, and improves the silicon-based negative electrode material performance. The cycling stability of the battery is improved.

A negative electrode for an electrochemical device and an electrochemical device including the same are provided. The negative electrode for the electrochemical device comprises: a current collector; and a negative electrode active material layer present on the current collector, wherein the negative electrode active material layer comprises particles containing a silicon-based active material, a linearly conductive material, and a binder for the particles, wherein the dispersion of the particles within the negative electrode active material layer is 1 × 10⁻⁶. ‑2 Up to 10×10 ‑2 The standard deviation of particle dispersion is 1×10⁻⁶. ‑3 Up to 4×10 ‑3 The volume expansion rate of the negative electrode active material layer is 3% to 30%.

The present invention belongs to the technical field of coated sand, and specifically relates to a high temperature resistant coated sand for cast steel and a preparation method thereof. The high temperature resistant coated sand for cast steel in the technical solution of the present invention comprises the following components in parts by weight: 150-200 parts of aggregate, 5-10 parts of phenolic resin, 0.3-0.8 parts of composite additives, 1.0-5.0 parts of curing agent, and 0.3-0.6 parts of lubricant. The composite additives include 30-40% white corundum, 20-30% expanded graphite, 25-35% high aluminum pyrophyllite, and 10-15% surfactants, and the surfactants include polyhydroxy surfactants. The composite additives for coated sand are compounded with inorganic flame retardant materials and polyhydroxy surfactants, and the material decomposition endothermic flame retardant mechanism is utilized to slow down the combustion decomposition time after the phenolic resin is cured, thereby improving the heat resistance and strength of the coated sand.

This application relates to the field of battery technology, specifically to battery cells, battery devices, energy storage devices, and power consumption devices. In the negative electrode sheet of a battery cell, the negative electrode active layer includes a first active layer and a second active layer. The second active layer is disposed between the first active layer and the negative electrode current collector. The first active layer contains a first negative electrode active material, and the second active layer contains a second negative electrode active material. The sphericity of the first and second negative electrode active materials is independently 0.7~0.9, and their roundness is independently 0.42~0.65, respectively. Furthermore, the sphericity and / or roundness of the first negative electrode active material is greater than that of the second negative electrode active material. This application can improve the irreversible thickness growth of the negative electrode sheet during cycling and enhance kinetics, thereby helping to reduce the volume expansion of the cell throughout its life cycle while maintaining fast-charging performance.

The invention relates to a secondary battery and an apparatus. The secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the electrolyte comprises a solvent and a lithium salt, the solvent comprises non-fluorinated linear carbonic ester, fluorinated carbonic ester and a cyclic sulfone compound, the mass percentage content of the cyclic sulfone compound in the solvent is A%, the mass percentage content of the fluorinated carbonic ester in the solvent is B%, the mass percentage content of the lithium salt in the solvent is A%, and the mass percentage content of the lithium salt in the solvent is A%. 0.05 < = A / B < = 2; the negative pole piece comprises a negative active material selected from a silicon-based material, the mass percentage content of the silicon-based material in the negative active material is C%, and C / A is greater than or equal to 2 and less than or equal to 18. The electrolyte can effectively improve the high-temperature gas production problem of the silicon-based negative electrode secondary battery, improve the thermal runaway temperature of the battery, reduce the thermal runaway damage of the battery, and ensure the excellent normal-temperature cycle performance and high-temperature cycle performance of the battery.

The invention provides amorphous silicon monoxide and a preparation method thereof, a negative active material, a negative pole piece and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: by taking nitrogen and / or rare gas as a gas source, carrying out plasma bombardment treatment on crystalline silicon monoxide by adopting a plasma treatment instrument to obtain amorphous silicon monoxide. According to the preparation method, crystalline silicon oxide is bombarded by using a high-energy shielding gas plasma beam to be amorphized so as to obtain amorphous silicon oxide, so that the volume expansion of silicon oxide in a lithium intercalation process can be reduced, and the cycle performance of a battery when the amorphous silicon oxide is used as a negative electrode active material is improved.

The present invention relates to a uniformly modified silicon monoxide negative electrode material, and a preparation method therefor and the use thereof. The silicon monoxide negative electrode material comprises silicon monoxide and carbon atoms, wherein the carbon atoms are uniformly distributed in silicon monoxide at an atomic level; a carbon atom is bonded to a silicon atom to form an amorphous Si-C bond, and an X-ray diffraction (XRD) energy spectrum has no SiC crystallization peak; in solid-state nuclear magnetic resonance (NMR) detection of the uniformly modified silicon monoxide negative electrode material, the 29Si NMR spectrum shows that there is a resonance peak of Si-C between -10 ppm and -20 ppm; the average particle size D50 of silicon monoxide negative electrode material particles is 1 nm-100 µm, and the specific surface area is 0.5 m2 / g-40 m2 / g; the mass of the carbon atoms accounts for 0.1%-40% of the mass of silicon monoxide. According to the present invention, by using a gaseous method, carbon atoms are uniformly embedded into silicon monoxide at an atomic level, the material has small volume expansion in a lithium dis-embedding process, the conductivity coefficient for lithium ions is high, and the cycle performance and rate performance of the material are improved.

The composite-coated conversion positive electrode material comprises a conversion positive electrode base and a composite coating layer coated on the surface of the conversion positive electrode base, the conversion positive electrode base is M x S y , M a O, M b Z, M is at least one of Li, Fe, Cu, Ni, Mn, Co, Mo, Sn, Ti and W, Z is at least one of F, Cl and Br, the values of x, y, a and b vary according to the principle of electrical neutrality; the particle size of the conversion positive electrode base ranges from 30 nm to 25000 nm, the thickness of the composite coating layer accounts for 0.1% to 10% of the particle size of the conversion positive electrode base, the composite coating layer comprises an elastomer material and an electronic conductor material, the breaking elongation of the elastomer material is greater than or equal to 100%, and the tensile strength is greater than or equal to 5 MPa.

The invention relates to the technical field of battery negative electrode materials, and provides a silicon-carbon negative electrode material, a negative electrode and a preparation method and application thereof. The method comprises the following steps: S1, preparing a silicon material A coated with elemental sulfur; s2, preparing a graphite oxide material B; s3, stirring and dispersing the elemental sulfur coated silicon material A and the graphite oxide material B in a polar solvent and a nonionic dispersant to obtain a mixed solution C; s4, adding a catalyst and a polymerization precursor into the suspension C; and S5, after filtering, washing with a polar solvent and deionized water, and drying to obtain the polymer-coated silicon carbon material negative electrode material. The surface of the nano silicon is coated with elemental sulfur, so that the cycle performance of the silicon negative electrode is improved; a polyamide coating layer formed on the surface of the graphite oxide material B through a catalyst and a polymerization precursor can effectively anchor the silicon nanoparticles on the surface of the graphite material, so that the volume expansion of the silicon nanoparticles in circulation is further reduced, and the circulation stability of the silicon-carbon negative electrode material is improved.

Provided are: a structure having a foamed resin layer, which is capable of forming the foamed resin layer in a short time; an interior body; and a method for manufacturing an electronic device. A base material (5) coated with a mixture (10) is accommodated in a cavity (4) of a mold (1). The mixture (10) contains an ultraviolet-curable adhesive and thermally expandable microcapsules. When the mold (1) is closed and the mixture (10) is irradiated with ultraviolet light, the adhesive resin component contained in the adhesive is polymerized, and the microcapsules are heated by heat generated in the polymerization reaction. A foamed resin layer (11) adhered to the substrate (5) is manufactured by expanding the heated microcapsules.

This invention provides a silicon-carbon anode material with an integrated embedded composite coating layer, its preparation method, and a lithium-ion battery, relating to the field of lithium-ion battery technology. The silicon-carbon anode material includes a silicon-carbon material core and a composite coating layer covering the surface of the core. The silicon-carbon material core comprises a porous carbon framework, nano-silicon dispersed within the porous carbon framework, and carbon nanomaterials grown in situ within the porous carbon framework. The composite coating layer comprises an elastic polymer matrix, and lithium salt and SEI film-forming additives distributed within the elastic polymer matrix. A portion of the carbon nanomaterials is embedded in the porous carbon, and another portion is embedded in the elastic polymer matrix, thereby forming a three-dimensional interlocking conductive network between the core and the coating layer. This invention solves the technical problems of volume expansion, SEI film instability, and kinetic sluggishness in silicon-based anode materials, achieving good cycle stability, high rate performance, and excellent structural integrity.

The invention belongs to the technical field of battery materials, and discloses a coated silicon negative electrode material and a preparation method and application thereof. The coated silicon negative electrode material comprises silicon and a coating layer coating the silicon, and the coating layer comprises vanadium pentoxide. According to the invention, the interface problem of silicon and sulfide electrolyte is improved through vanadium pentoxide coating, and the electrical properties of silicon are improved. Vanadium pentoxide is used as an excellent lithium storage material, the surface of a silicon material is coated with the vanadium pentoxide as a coating material, the interface problem of silicon and sulfide electrolyte can be improved, deposition of lithium on the negative electrode side and generation of lithium dendrites are reduced, the rate capability is improved, the volume expansion of vanadium pentoxide is small in the lithium intercalation and deintercalation process, and vanadium pentoxide is coated on silicon, so that the lithium intercalation and deintercalation efficiency is improved. The method can inhibit the volume expansion of silicon, reduce the damage of the volume change in the silicon lithiation lithium removal process to the contact property of silicon and sulfide solid electrolyte, and improve the cycling stability and rate capability of the material, so that the silicon material can be better applied to the sulfide solid-state battery.