100079 results about "Composite material" patented technology

A semiconductor device with a metal foil and a sealing resin material. Metal foil is formed integrally with the sealing resin layer.

The invention belongs to the technical field of circuit boards, and discloses a composite pressing process of a high multilayer rigid-flex circuit board, which comprises the following steps: performing microstructure processing on the surface of a rigid base material to form a three-dimensional reinforced interface, and performing chemical grafting modification treatment on a flexible base material to generate a multilayer pretreated substrate; identifying the positioning mark of each layer of substrate through an optical positioning system, establishing a lamination stress prediction model in combination with the thermodynamic parameters of the material, and outputting a lamination configuration scheme containing an interlayer matching relationship; placing the configured laminated structure in a multi-temperature-zone press, and executing a three-stage gradient heating and pressurizing program to realize interface fusion between adjacent layers of substrates; monitoring an interlayer deformation difference value of the substrate in real time through a sensing network, and eliminating the deformation difference to obtain a press-fit molded circuit substrate; through heterogeneous interface strengthening design, multi-physical field cooperative pressing and real-time deformation compensation, accurate interface fusion and low-warpage forming of the high-multilayer rigid-flex circuit board are realized.

A vacuum insulating panel includes first and second substrates (e.g., glass substrates), a hermetic edge seal, a pump-out port, and spacers sandwiched between at least the two substrates. The gap between the substrates may be at a pressure less than atmospheric pressure to provide insulating properties. The vacuum insulating panel may include a multi-layer edge seal structure, including at least one layer including boron oxide (e.g., B2O3 or any other stoichiometry).

The invention relates to a protective film uncovering process based on corner lifting and rolling cooperation type screen display glass. The protective film uncovering process comprises the following steps: S1, corner lifting; s2, tearing off; and S3, collecting the film. On one hand, through cooperation of the film tearing clamping jaw and the rolling wheel, step-by-step peeling with the rolling position and the peeling position aligned is kept, meanwhile, the angle between the connecting section and the screen display glass is gradually increased on the basis that the connecting section is turned inwards under the condition that the adhesion section is not stressed, the success rate of forming an inwards-turned peeling angle is greatly increased, and the production efficiency is improved. The probability that the film-tearing adhesive tape is separated from the protective film or the corner of the protective film is torn is reduced; on the other hand, the complete tearing rate of the protective film is increased based on the relative movement of the glass and the film tearing clamping jaw, the tearing risk of the protective film is reduced, more labor-saving and faster diagonal tearing is achieved, meanwhile, based on pulling formed by the film collecting clamping jaw and the film tearing clamping jaw and airflow blowing cooperation formed by the film collecting clamping jaw and the film tearing clamping jaw, the completeness of film collecting is improved, and the production efficiency is improved. And the problem that the film tearing adhesive tape is adhered to the film tearing clamping jaw is solved, so that the continuity of peeling off the protective film is improved.

The double-sided film tearing equipment for the screen display glass comprises a lower film tearing system and an upper film tearing system. On one hand, on the basis of multi-motion cooperation of the clamping jaw and the roller, the corner of the to-be-torn film is gradually torn off by keeping the rolling position and the stripping position aligned under blowing of airflow, the probability that the adhesive tape is separated from the to-be-torn film or the corner of the to-be-torn film is torn off is greatly reduced, and the success rate that the to-be-torn film forms the tearing angle is effectively increased; meanwhile, diagonal film tearing is formed based on relative movement of the glass and the clamping jaws, the risk that the protective film is torn or falls off is reduced, and more labor-saving and efficient film tearing is achieved; on the other hand, a torn film is clamped based on a film stripping chuck and cooperates with airflow blowing to separate an adhesive self-clamping jaw so as to improve the film stripping success rate, and in combination with butt joint of upper and lower film stripping system self-carrying tables which are reversely arranged, the direction of the film to be torn is switched in a turnover-free manner, so that the glass pollution or collision risk is remarkably reduced, the product yield is improved, and the production cost is reduced. Moreover, stable and continuous implementation of double-sided film tearing of multiple pieces of glass is ensured, and the film tearing efficiency is greatly improved.

Crystal growth systems with a baffle are provided. In one example, a crystal growth system for growing crystalline material, the crystalline material including silicon carbide, includes a seed holder configured to hold a silicon carbide seed crystal. The seed crystal provides a growth surface for growth of the silicon carbide crystalline material. The system includes a crucible at least partially defining a crystal growth chamber. The system includes a source material. The system includes one or more baffles within the crystal growth chamber and spaced apart from the source material. The one or more baffles include one or more apertures defined through the one or more baffles. The baffle includes a long dimension that is non-perpendicular to the growth surface of the seed crystal.

A secondary battery includes an electrode assembly including a negative electrode plate including a negative electrode leading end uncoated portion, a positive electrode plate including a positive electrode leading end uncoated portion, and an anti-deformation portion attached to the positive electrode leading end uncoated portion, an end of the positive electrode leading end uncoated portion and an end of the anti-deformation portion being located ahead of an end of the negative electrode leading end uncoated portion, a case accommodating the electrode assembly, and electrically coupled to the negative electrode plate, and a cap assembly sealing the case.

A filling-material filled cloth product includes: a pair of fabrics layered together and sewn peripherally at a filling-material partition stitch defining therein a bag-shaped filling-material accommodation space; and a thermally insulating filling material accommodated within the bag-shaped filling-material accommodation space, wherein one fabric of the pair of fabrics is cut so as to be larger than the other fabric of the pair of fabrics so that the one fabric having a surplus portion such as a tuck or dart in proximity to the filling-material partition stitch made as a result of largely cutting is pushed up away from the filling material so as to stand up in a three-dimensional manner from the other fabric, and thereby, the filling-material accommodation space is three-dimensionally shaped so as to accommodate the filling material having a substantially uniform thickness in proximity to the filling-material partition stitch.

The invention discloses a refined disassembly system and method for a battery monomer, and belongs to the technical field of battery disassembly. The production line comprises a perforating device, a cutting device, a cutting device, a scattering device, a sorting device, a color sorting device, a defluorination device and a powder removal device. The method comprises the following steps: perforating a battery to discharge electrolyte, separating a shell from an inner core by a cutting device, cutting the inner core by a cutting device, scattering by a scattering device, sorting a diaphragm by a sorting device, sorting positive and negative electrode materials by a color sorting device, and respectively removing fluorine by a defluorination device. And finally, the metal foil and the powder are separated through the powder removing device, the damage degree of the crystal structure of the black powder can be reduced, the black powder and the metal fragments are efficiently separated according to the density difference, the metal foil and the black powder are not likely to be excessively mixed, the separation purity is high, the secondary treatment situation is reduced, efficient separation and recycling of the electrode material are achieved, and the production cost is reduced. And the comprehensive function and the resource utilization rate of the system are obviously improved.

The invention provides a dry-method positive electrode, a preparation method thereof and a battery, and particularly relates to the field of batteries. The dry-method positive electrode comprises a positive electrode current collector and a positive electrode diaphragm, and the positive electrode diaphragm is arranged on at least one side of the positive electrode current collector; wherein the positive electrode membrane comprises a positive electrode active material and a binder, and the fibrillation degree of the binder in the positive electrode membrane is greater than or equal to 96%. According to the dry-method positive electrode, the rate capability of the battery can be effectively improved by improving the fibrillation degree of the binder.

The invention relates to the technical field of isotope production, in particular to a welding-free target capsule for isotope production and a manufacturing method of the welding-free target capsule. The welding-free target capsule comprises a target material used for generating isotopes under bombardment of high-energy particles; the first metal film covers one side of the target material; the second metal film covers the other side of the target material; wherein the first metal film and the second metal film are made of materials with ductility; the edge of the first metal film and the edge of the second metal film are attached to each other on the peripheral side of the target material and are folded into an annular sealing structure. In the invention, the metal film with good ductility is used as a coating material of the target material, and the sealing structure is formed by folding the connecting part of the metal film, so that the target capsule can be ensured to efficiently dissipate heat in a water-cooling environment, the manufacturing mode of the sealing structure can be improved, the manufacturing steps of the sealing structure are simple and easy to implement, and the manufacturing cost of the target capsule is further reduced.

The invention discloses a preparation method of a composite high-entropy hard carbon negative electrode material and a sodium ion battery, and relates to the technical field of electrochemical energy storage materials. Existing doping limit is broken through through'high entropy design ', atomic-scale mixing of five elements and more than five elements is realized, strong structural stability which cannot be realized by traditional binary / ternary doping is achieved, 'molecular anchoring' and'entropy locking 'are completed by combining a pre-assembly technology with stepped carbonization, the problem of pain point of multi-element segregation is solved, and the method is suitable for large-scale industrial production. Sodium storage dynamic and thermodynamic properties of a high-entropy hard carbon precursor and an intermediate are synchronously improved through elaborate combination design of multiple elements and subsequent carbonization process parameter optimization, 'defect-interlayer spacing-pore structure 'triple regulation is realized, and the defect degree of high-entropy hard carbon is reduced through design of a coating process; the prepared composite high-entropy hard carbon negative electrode material shows excellent comprehensive performance in a sodium-ion battery, and especially has obvious advantages in high initial coulombic efficiency, high rate capability and long stability.

The invention discloses silk fibroin composite gel and a preparation method thereof, and relates to the technical field of tissue filling materials. The preparation method of the silk fibroin composite gel comprises the following steps: preparing silk fibroin and carrying out amination modification on the silk fibroin to obtain aminated silk fibroin; carrying out dynamic cross-linking on the aminated silk fibroin and the oxidized sodium alginate through a Schiff base bond by adopting an enzyme catalysis cross-linking process to obtain a dynamic cross-linked network solution; adding a temperature-sensitive component into the dynamic cross-linked network solution, and uniformly mixing to obtain a temperature-sensitive-dynamic dual-network pre-gel solution with temperature responsiveness; loading the active component into the temperature-sensitive-dynamic dual-network pregel solution to obtain a composite gel solution; incubating the composite gel solution to obtain primary gel; after disulfide bonds are introduced into the primary gel, cross-linking strengthening and sterilization are carried out, and the silk fibroin composite gel is obtained. Through temperature-sensitive-dynamic dual-network design, active components and disulfide bonds are introduced to strengthen crosslinking, and the problems that traditional injectable gel is irreversible, single in function, prone to collapse after being filled and the like are systematically solved.

The invention belongs to the technical field of gas turbine maintenance, and particularly relates to a solid-state repair method for a hot-end component of a gas turbine, which comprises the following steps: S1, acquiring damage information of the surface of a to-be-repaired matrix; s2, roughening treatment is conducted on a damaged area on the surface of the to-be-repaired base body, and electrochemical activation treatment is conducted on the roughened damaged area; s3, supersonic speed cold spraying treatment is conducted on the treated damaged area, and gradient materials are deposited on the damaged area layer by layer till a compact repairing layer is deposited on the surface of the base body; s4, selective laser remelting treatment is conducted on the compact repairing layer of the damaged area; s5, carrying out laser shock on the dense repair layer subjected to the remelting treatment; and S6, the base body subjected to laser shock treatment is machined till the standard geometric dimension of the base body is recovered. The method can solve the problems of large heat input, matrix damage, insufficient bonding strength and the like in the process of repairing the damaged area of the matrix in the traditional hot working technology.

The invention discloses a yielding grouting anchor rod for a high-ground-pressure soft breakable roadway, and belongs to the technical field of roadway supporting, the yielding grouting anchor rod comprises an anchor rod body, the outer surface of the anchor rod body is sleeved with a yielding cylinder, a yielding plate and a rubber plug, the rubber plug is located on one side of the yielding cylinder, the outer surface of the yielding plate is attached to the inner surface of the yielding cylinder, and the outer surface of the yielding plate is attached to the inner surface of the yielding cylinder. A spring and evenly-arranged connecting rods are arranged on the outer wall of one side of the yielding plate, the connecting rods are located between the anchor rod and the spring, one end of each connecting rod penetrates through the inner wall of one side of the yielding cylinder to be connected with one end of a rubber plug, a sleeve is embedded in the outer surface of the rubber plug, and the outer wall of one side of the sleeve is connected with the outer wall of one side of the yielding cylinder. The pressure plate pushes the compression spring to deform, tensile fracture of the anchor rod body caused by overlarge pressure is avoided, the connecting rod is driven to push the rubber plug in the process of pushing the compression spring to deform, the dual pressure yielding and releasing function is achieved, and the anchor rod can adapt to roadway surrounding rock deformation in the high ground pressure environment to a certain extent.

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

A silicon-carbon material, a preparation method therefor, a secondary battery, and an electric device. The silicon-carbon material comprises silicon-carbon composite particles; the silicon-carbon composite particles comprise a porous carbon material, nano-silicon grains and a silicon carbide material layer; the porous carbon material is provided with through pores, the nano-silicon grains are located in the through pores, and the silicon carbide material layer is partially located on through pore walls; the grain size of the nano-silicon grains is not smaller than the average pore diameter of the porous carbon material. The silicon-carbon material is used as an active material of a negative electrode sheet, thereby improving the cycle performance of batteries.

Web material structuring belts that impart structure to a web material during a web material structuring operation and / or structured web material forming operation, method for making same and methods for using same to make structured web materials, for example structured fibrous structures, such as structured sanitary tissue products such as structured toilet tissue, structured paper towels and structured facial tissue are provided.

The invention discloses an anti-fouling piezoelectric ceramic membrane which comprises a support body, a coil and a piezoelectric ceramic separation layer, the support body is made of porous ceramic with a through hole in the middle; the coil is a closed loop composed of a lead coil and a crystal oscillator; the piezoelectric separation layer is coated on the inner wall of the through hole of the support body; and the coil is arranged between the support body and the piezoelectric ceramic separation layer. When a medium containing electrolyte passes through a membrane hole, the coil generates induction direct current, the direct current is converted into positive wave pulse current through the oscillator, the wound and overlapped piezoelectric ceramic membrane separation layer is excited, ultrasonic vibration is generated, and therefore the membrane dirt blocking condition is reduced, the use efficiency of the ceramic membrane is improved, and the maintenance and use cost is reduced.

Provided in the present application are an electrode assembly, a battery cell, a battery and an electrical device. The electrode assembly comprises a first electrode sheet and a second electrode sheet which have opposite polarities. The first electrode sheet comprises a first electrode sheet body, wherein the first electrode sheet body comprises a first current collecting body and first active material layers, the first current collecting body comprising two first surfaces opposite each other in the direction of thickness of the first current collecting body, and a first end face connecting the two first surfaces, and the first active material layers being arranged on the first surfaces. The electrode assembly further comprises an insulating member connected to the first electrode sheet body, wherein at least part of the insulating member is arranged on the outer side of the first end face in a first direction, the first direction being perpendicular to the direction of thickness. The insulating member can separate burrs on the first end face from the second electrode sheet, thereby reducing the risk of conduction between the burrs and the second electrode sheet and reducing the possibility of thermal runaway caused by a short circuit, improving the reliability of the battery cell.

The invention belongs to the technical field of water treatment, and particularly provides a fungus filament bamboo-based biomass composite material and a lead-containing sewage treatment method. According to the invention, the lead-containing sewage is pretreated by using microorganism neurospora crassa, and then the lead-containing sewage is post-treated by using the fungus filament bamboo-based biomass composite material prepared under specific conditions, so that the mildness of microorganism treatment and the efficient adsorbability of the biomass composite material are effectively combined; and finally, the removal rate of heavy metal lead is increased, the cost is low, and environmental friendliness is achieved.

The invention relates to the technical field of solar cell module packaging, in particular to a packaging structure for a perovskite-back contact crystalline silicon laminated solar cell and a preparation method of the packaging structure. The packaging structure comprises a front light conversion glass layer, a perovskite top cell layer, an infrared light-transmitting adhesive film layer, a back contact crystal silicon bottom cell layer, an adhesive film layer and a packaging bottom plate which are arranged in sequence, and butyl rubber surrounding the perovskite top cell layer, the infrared light-transmitting adhesive film layer, the back contact crystal silicon bottom cell layer and the adhesive film layer is arranged between the front light conversion glass layer and the packaging bottom plate, and the near infrared transmittance of 780 nm to 1100 nm in the infrared transparent adhesive film layer is 93% to 100%. According to the packaging structure based on the front light conversion glass layer and the infrared light-transmitting adhesive film layer, regulation and control of short-wave ultraviolet and near-infrared spectrums are considered, and the photoelectric property and reliability of the perovskite-crystalline silicon four-terminal laminated device are remarkably improved.

The invention relates to the field of battery materials, in particular to a battery cell and an electrochemical device comprising the battery cell, the battery cell comprises a positive pole piece, a negative pole piece, electrolyte and a diaphragm located between the positive pole piece and the negative pole piece; the diaphragm comprises a first coating and a second coating of a base membrane, the first coating is located on the surface of one side of the base membrane and faces the positive pole piece, the second coating is located on the surface of the other side of the base membrane and faces the negative pole piece, and the first coating and the second coating both comprise a first element and a second element; the difference between the mass content ratio b of the first element to the second element on the surface of the second coating and the mass content ratio a of the first element to the second element on the surface of the first coating is controlled to meet a certain range, so that the battery has long circulation and excellent thermal safety performance.

The invention belongs to the technical field of design and preparation of solid electrolyte materials, and particularly relates to a LiBH4-based composite solid electrolyte material and a preparation method thereof.The LiBH4-based composite solid electrolyte material is obtained by performing high-energy ball milling on a mixture of LiBH4 and one or two metal halides MX2 in a certain molar ratio in an argon atmosphere; m is Mg, Zn, Ni or Bi; x is F, Cl, Br or I. According to the LiBH4 composite solid electrolyte prepared by the preparation method disclosed by the invention, the ionic conductivity at room temperature is improved to 10 <-4 > S cm <-1 > or above, and the ion diffusion activation energy is only 0.16 eV; the process is simple, the preparation time is short, the repeatability is high, no pollution is caused to the environment, and the industrial production requirement is met, so that the all-solid-state lithium ion battery electrolyte is expected to realize commercialized application.

A spoke winding type high-sensitivity humidity sensor, the humidity sensor comprising a humidity-sensitive winding material and a spoke winding skeleton disc; a plurality of "T" shaped winding skeletons are uniformly distributed in a radial manner on the circumference of the spoke winding skeleton disc, and the humidity-sensitive winding material is wound on the plurality of "T" shaped winding skeletons; the space between every two adjacent "T" shaped winding skeletons simultaneously constitutes a winding limiting groove and an air flow channel, and after the humidity-sensitive winding material is wound, there is still space, i.e. the air flow channel, for air circulation, which is used to shorten the humidity absorption response time and the humidity desorption response time of the humidity-sensitive winding material.

The utility model provides a cloth pressing assembly and water-containing material dewatering equipment, the cloth pressing assembly comprises a pressing rod which is used for pressing filter cloth and extends along the horizontal direction, and an angle is formed between the length direction of the pressing rod and the laying direction of the filter cloth; the limiting component is at least arranged on the side, facing the laying direction of the filter cloth, of the pressing rod, and the limiting component is attached to the pressing rod. According to the utility model, through the arrangement of the limiting component, when the pressing rod is subjected to the horizontal acting force of the filter cloth, the pressing rod can be propped through the limiting component, particularly, one side, facing the laying direction of the filter cloth, of the pressing rod is propped, so that the pressing rod is prevented from displacing along the horizontal direction, and the pressing effect of the pressing rod on the filter cloth is ensured.

The present application discloses a memory device and a method for fabricating the memory device. The memory device includes a substrate; a landing area positioned on the substrate; a bottom electrode positioned on the landing area, wherein the bottom electrode has a container-shaped profile; a support layer positioned over the substrate and laterally surrounded the bottom electrode; a dielectric structure including a dielectric layer conformally positioned on the bottom electrode and on a top surface of the support layer, and covering top corners of the support layer, and a plurality of dielectric portions conformally positioned on the dielectric layer and covering the top corners of the support layer; and a top electrode structure positioned on the dielectric structure. The dielectric portions are sandwiched by the top electrode structure and the dielectric layer. The top surface of the third support layer is higher than a top surface of the bottom electrode.

The invention discloses a defect detection system for a metal-composite material mixed structure device. The defect detection system comprises an industrial control computer, a mechanical scanning arm, a polarization detection probe, an ultrasonic detector assembly and a power supply, the invention further provides a defect detection method for the metal-composite material mixed structure device. The defect detection method specifically comprises the following steps: acquiring polarization image information of the metal surface; solving polarization image parameter information; carrying out surface defect detection; metal internal ultrasonic detection information is obtained; performing internal defect detection; and performing multi-mode data fusion detection. According to the invention, two information sources with complementary advantages, namely polarization and ultrasound, are selected as detection information sources of the multi-modal detection method, so that all-directional defect detection and visualization on the surface-interior of the metal-based composite material mixed structure device are effectively realized; and a feasible technical method is provided for engineering application of polarized light / phased array ultrasonic multichannel integrated detection.

The invention discloses a preparation method of a phosphorus / silicon composite negative electrode material, and belongs to the technical field of lithium battery negative electrode materials. The method comprises the following steps: putting porous carbon into a CVD (Chemical Vapor Deposition) furnace, vacuumizing, heating to 180-230 DEG C, and keeping the temperature for 50-70 minutes; the temperature is increased to 600-800 DEG C, SiH4 silane gas is introduced, cracking deposition is carried out, and the deposition time is 2-3 h; cooling to 300-500 DEG C, introducing a phosphorus source, and permeating into mesopores of 2-50 nm; and cooling the CVD furnace to 260-350 DEG C, and keeping the temperature for 24-72 hours, so that the simple substance is phosphatized into the amorphous red phosphorus nanoparticles. Nanocrystallized phosphorus and silicon are compounded into porous carbon channels, and the characteristic that the lithiation potential of a phosphorus negative electrode is high is utilized, so that the negative electrode is far away from the lithium precipitation potential; meanwhile, the lithiation gram volume of the phosphorus negative electrode is also very high, and the gram volume of the material is not reduced. Silicon is deposited firstly, then phosphorus is deposited, and the silicon is deposited on the innermost side of a pore channel; and expansion in the phosphorus / silicon lithiation process is inhibited by utilizing the confinement of the porous carbon, so that circulation is guaranteed.

The invention relates to the field of batteries, in particular to a preparation method and system of a silicon-carbon material, and the preparation method comprises the following steps: pretreating porous carbon, conveying the pretreated porous carbon to a fluidized bed reactor, sequentially introducing a silicon source gas and a carrier gas for silicon deposition treatment, heating, introducing a carbon source gas, adjusting the flow of the carrier gas for carbon coating treatment, and discharging and cooling to obtain a finished product, meanwhile, reaction tail gas is recycled. The preparation system comprises a gas inlet unit, a fluidized bed reactor unit, a tail gas circulation unit, a feeding preheating unit and a discharging unit. The fluidized bed reactor comprises an outer shell, an up-down stirring device, a heat exchange assembly and an air distribution assembly, and efficient reaction and temperature control can be achieved. The silicon-carbon material prepared by the method has excellent electrochemical performance and is suitable for a lithium ion battery negative electrode material. The unique porous structure and the uniform carbon coating layer effectively improve the conductivity and the structural stability of the material, and meanwhile, the volume expansion effect of silicon in the charging and discharging process is reduced.