498results about "Electrode molding" patented technology

Embodiments described herein relate generally to apparatuses and processes for forming semi-solid electrodes having high active solids loading by removing excess electrolyte. In some embodiments, the semi-solid electrode material can be formed by mixing an active material and, optionally, a conductive material in a liquid electrolyte to form a suspension. In some embodiments, the semi-solid electrode material can be disposed onto a current collector to form an intermediate electrode. In some embodiments, the semi-solid electrode material can have a first composition in which the ratio of electrolyte to active material is between about 10:1 and about 1:1. In some embodiments, a method for converting the semi-solid electrode material from the first composition into the second composition includes removing a portion of the electrolyte from the semi-solid electrode material. In some embodiments, the method includes mechanically compressing the intermediate electrode to remove the portion of electrolyte from the semi-solid electrode material.

The invention relates to the technical field of electrode processing, and provides a dry electrode rolling device with a controllable pressure roll gap, which comprises at least two compression rollers with inner cavities, and a rolling gap is arranged between the two compression rollers; the first touch piece is arranged in the inner cavity, the first touch piece and the pressing roller are arranged in a split mode, the first touch piece is provided with a first touch part, the first touch part makes contact with the inner wall of the inner cavity, and the first touch part and the rolling seam are located on the inner side and the outer side of the roller wall of the pressing roller respectively. According to the technical scheme, the problems that in the prior art, dry powder materials are not uniformly distributed, so that the compression rollers deform, the gap between the adjacent compression rollers is reduced, the quality of the formed electrode diaphragm is influenced, the thickness is not uniform, the surface is not flat and the like are solved.

The invention relates to a modified binder for a dry-method electrode, a dry-method electrode pole piece and a preparation method of the dry-method electrode pole piece. Polycyclic aromatic hydrocarbon is dissolved in an aprotic polar solvent, alkali metal is added, and a polycyclic aromatic hydrocarbon alkali metal reagent is generated; and adding polytetrafluoroethylene into the polycyclic aromatic hydrocarbon alkali metal reagent to obtain the modified polytetrafluoroethylene. Alkali metal ions in the polycyclic aromatic hydrocarbon alkali metal reagent can destroy C-F bonds in the PTFE, remove some fluorine atoms on the surface of the PTFE and leave a carbonized layer and some polar groups such as hydroxyl groups, carbonyl groups and unsaturated bonds, and the groups can increase the surface energy, reduce the contact angle and improve the wettability, so that the cohesiveness of the modified PTFE is improved, and the service life of the PTFE is prolonged. The binding force between the PTFE and the conductive agent and the current collector is enhanced, and the problem that the viscoelasticity of the PTFE in the dry-method pole piece is insufficient is solved. Through modification, part of C-F bonds in PTFE are destroyed in advance, so that generation of interface side reaction products is reduced, the problem of initial effect reduction of a dry-method electrode is improved, and the cycle stability of a battery is improved.

The invention discloses a lithium battery pole piece dry method manufacturing process and a manufacturing equipment assembly, and the lithium battery pole piece dry method manufacturing process comprises the following steps: a powder material preparation part: mixing raw materials, kneading and fiberizing to form a powder material; the film material preparation part is used for extruding the powder material from a discharging channel to a material receiving surface, a metering gap is formed between the discharging channel and the material receiving surface, and the material receiving surface can move relative to the discharging channel, so that the powder material is spread to the material receiving surface, the powder material on the material receiving surface is rolled, and the powder material is changed into a film material. According to the lithium battery pole piece dry method manufacturing process and the manufacturing equipment assembly, the thickness of a film material can be controlled, the thickness deviation of the film material is reduced, and the influence on the product quality is avoided.

The invention discloses a novel lithium battery pole piece coating machine, which belongs to the technical field of coating machines, and comprises a coating machine body, and an unwinding device, a scratch monitoring device, a tensioning device, a sectional rolling assembly, a cutter assembly, a continuous rolling assembly, a coating assembly and a winding device which are sequentially arranged in the winding direction of a pole piece from front to back, the scratch monitoring device comprises a supporting rod fixed to the coating machine body, the length direction of the supporting rod is consistent with the width direction of the pole piece, and a plurality of linear array cameras are evenly arranged on the lower side of the supporting rod in the length direction at intervals; the sectional type rolling assembly comprises a main motor, an output shaft and a pressing roller, the output shaft comprises multiple sections of supporting shafts which are sequentially connected in the axial direction, and the two ends of each supporting shaft are connected with a first hinge joint and a second hinge joint correspondingly. According to the lithium battery pole piece coating device, protrusions and recesses on the surface of the lithium battery pole piece can be treated in time, and the uniformity of the subsequent pole piece during coating is improved.

The invention discloses a method for improving the fibrillation state of a dry-method electrode, and relates to the technical field of lithium batteries. The method comprises the following specific steps: mixing an active substance and a conductive agent for pre-dispersion, adding a binder during pre-fibration, adjusting dry-mixing equipment, continuously stirring to realize fibrillation, and cooling and homogenizing to obtain a dry-mixed electrode material; preparing an original film, and laminating with a current collector to obtain a finished product pole piece; the influence of the particle size on the fibrillation state is analyzed according to the state of the fibrillated material, so that different processes are selected, and the input power and the process of dry mixing equipment are controlled to control the fibrillation state of the dry-method electrode.

The invention relates to the technical field of lithium batteries, in particular to a multi-layer negative electrode and a preparation method and application thereof.The base foil of the multi-layer negative electrode is provided with a bottom layer, the bottom layer is provided with a surface layer, and the surface layer comprises surface layer glue, surface layer conductive carbon and a surface layer active substance; the peel strength of the bottom layer is recorded as Rb, the peel strength of the surface layer is recorded as Rs, the rebound correction coefficient of the surface layer is recorded as Ee, the mass percent of surface layer glue in the surface layer is recorded as Cc, Rb is larger than or equal to 60N / m and smaller than or equal to 320N / m, Rs is larger than or equal to 5.6 N / m and smaller than or equal to 42N / m, Ee is larger than or equal to 0.233 and smaller than or equal to 1.45, Cc is larger than or equal to 1.2% and smaller than or equal to 7.5%, and [In (Rb / Rs-0. 4)] * (Ee / Cc) 1 / 2 is larger than or equal to 0.12 and smaller than or equal to 26.67. According to the invention, the negative electrode is designed into a multi-layer structure and is supplemented with the surface glue with excellent performance, so that the anti-expansion performance of the multi-layer negative electrode is improved under the synergistic effect, and the rapid charging performance and the long cycle performance of the lithium ion battery can be improved.

Embodiments described herein relate to electrochemical cells that include electrodes having two-dimensional surface patterns. In some aspects, the electrochemical cell can include a cathode current collector, an anode current collector, a cathode material disposed on the cathode current collector, an anode material disposed on the anode current collector, and a separator interposed between the cathode material and the anode material. The cathode material includes a first cathode surface abutting the cathode current collector and having a first cathode surface profile that is substantially flat and planar. The cathode material further includes a second cathode surface opposite to the first cathode surface and having a second cathode surface profile comprising a plurality of projections extending in a direction away from the first cathode surface. The anode material includes a first anode surface abutting the anode current collector and having a first anode surface profile that is substantially flat and planar.

The invention discloses a low-porosity and low-impedance dry positive electrode of a solid-state battery and a preparation method of the low-porosity and low-impedance dry positive electrode. The dry positive electrode of the solid-state battery comprises a large-particle positive electrode active material, a small-particle positive electrode active material, a first conductive agent, a second conductive agent, a third conductive agent, a small-size sulfide solid electrolyte, a large-size sulfide solid electrolyte and a binder. All the components are mixed in a manner of size matching and step-by-step embedding. Size matching among multi-stage particles is introduced, so that the size of gaps among different components is reduced, and the porosity is reduced; the binding agent and part of the conductive agent are premixed to form a'binding-conductive double network ', and then the active material and the electrolyte are gradually embedded, so that the purpose of low impedance of the composite positive electrode is achieved. And finally, the rate capability and the cycling stability of the solid-state battery are improved.

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

The invention provides a mixed negative electrode material. The mixed negative electrode material comprises a silicon carbon material and a graphitized material, the silicon-carbon material takes porous carbon as a matrix, and a silicon layer and an ordered layered carbon layer are sequentially deposited on the surface of the porous carbon matrix; the compaction density of the mixed negative electrode material is 1.0-2.0 g / cm < 3 > and the conductivity is 0.80-118 S / cm under the pressure of more than or equal to 5 Mpa; the ratio of the mass ratio of the graphitized material to the mass ratio of the silicon-carbon material is greater than or equal to 1.6 and less than or equal to 8.5, and the particle size Dv10 of the mixed negative electrode material is 1.1-5.2 mu m; dv50 is 5.3 [mu] m to 16 [mu] m; dv90 is from 16 [mu] m to 35 [mu] m; the porosity of the mixed negative electrode material is 0.005%-0.1%; the specific surface area is 1.2-3.2 m < 2 > / g, and the surface of the negative electrode is provided with a cutting area. The problems that the negative electrode interface stability is reduced, the impedance is increased, the lithium ion conducting capacity is low, and the battery cycle performance is poor are solved.

Provided are a method and apparatus for calibrating contact parameters of electrode materials, and a computer storage medium. The method includes the following operations. A discrete element simulation test is performed on an electrode material based on a calibration model and calibration ranges of contact parameters of the electrode material when an axial force-displacement curve of a target pellet of the electrode material meets an adaption condition of the contact model; then a simulated axial pressure-axial strain relationship of the electrode material is acquired based on a target discrete element simulation parameter of the electrode material; whether the contact parameters are calibrated successfully is judged based on this relationship; and when the contact parameters are calibrated successfully, calibration results of the contact parameters are determined.

The invention discloses double-roller type pressing equipment for lithium battery production and manufacturing, and relates to the technical field of lithium battery production, the double-roller type pressing equipment comprises a machine base, and a lifting frame and a supporting frame are fixedly mounted on the two sides of the top of the machine base correspondingly; and the conveying assembly is used for guiding and conveying the lithium battery pole pieces, and the conveying assembly is fixedly mounted at the top of the lifting frame. According to the double-roller type pressing equipment for lithium battery production and manufacturing, before a pole piece is pressed, a worker adjusts the height of a guide roller and a bearing frame set, so that the pole piece is placed above the bearing frame set, the guide roller and a rotating rod are arranged on the two sides of the pole piece when the pole piece is conveyed and generate friction with the surface of the pole piece, and at the moment, a second motor drives the guide roller to rotate; the pole pieces are guided and conveyed, the pole pieces are pretreated by the guide rollers and the rotating rods before being pressed, the pressing positions are more fit, and the obliquely arranged lifting frame rubs with the pole pieces through the guide rollers, the rotating rods and the pole pieces to clean dust on the pole pieces when the pole pieces are conveyed.

The invention discloses a preparation method of a lithium battery-structure integrated composite material, and belongs to the technical field of lithium battery preparation. The method comprises the following steps: uniformly mixing epoxy resin, a diluent, a curing agent 1 and a lipophilic emulsifier to obtain a dispersion liquid 1; dropwise adding an electrolyte solution into the dispersion liquid 1 at a constant speed, and stirring at a constant temperature and a high speed to obtain a water-in-oil emulsion; uniformly mixing deionized water, a hydrophilic emulsifier and a curing agent 2 at a constant temperature to obtain dispersion liquid 2; adding the water-in-oil emulsion into the dispersion liquid 2, and emulsifying at a high speed to obtain a water-in-oil-in-water emulsion system; heating and curing the water-in-oil-in-water emulsion system; after curing, centrifuging, washing and drying to obtain a solid nano adhesive; and grinding the solid nano adhesive, and then uniformly paving the solid nano adhesive in a mold for high-temperature treatment to obtain the lithium battery diaphragm. The electrolyte solution is selected as the internal water phase of the water-in-oil emulsion, so that the internal osmotic pressure of the emulsion can be increased, the emulsion is prevented from being fused, and the particle size is increased.

The invention relates to the technical field of electrode plate preparation, and particularly discloses a method for preparing a dry-method electrode plate through glue spraying and coating, and the method comprises the following steps: S1, respectively pouring dry-method powder into two feeding mechanisms; s2, vertically unwinding the current collector by an unwinding mechanism; s3, cutting the head ends of the two dry-method self-supporting films which are longitudinally symmetrical along the current collector by a preliminary compounding mechanism; s4, the two attached dry-method self-supporting films and the current collector enter a rolling mechanism to be rolled to form a pole piece; and S5, guiding the pole piece into a single-section drying oven by a guide roller II for drying. The head end of the dry-method self-supporting film is cut off through the head end cutter, and when the dry-method self-supporting film is compounded with a current collector in a rolling mode, the head end of the dry-method self-supporting film is in a flush state, so that the head end of the pole piece formed in a rolling mode is kept in a flush state, and when the pole piece is put into use in the later period, the head end of the pole piece does not need to be cut; therefore, waste of the current collector is avoided.

The invention discloses a coating system and a coating method.The coating system determines a target winding drum to be wound on the basis of state parameters of all chucks used for clamping winding drums in a winding device; and under the condition that it is determined that the current coating process parameters meet the roll changing conditions, a winding device is controlled to change rolls so as to wind the materials through the target winding drum. Through the state parameters of the chucks, the coating process parameters and the roll changing conditions, the target winding drum is automatically switched in the winding device to wind the materials, and the automation degree of roll changing is greatly improved.

Provided is an electrode stacked body that can be used for assembly of an electrochemical device and can reduce an internal resistance, a method for producing the electrode stacked body, and an electrochemical device that includes the electrode stacked body. The electrode stacked body of the present invention includes a first electrode, a second electrode, and an isolation layer interposed between the first electrode and the second electrode. At least one of the first electrode and the second electrode has an electrode mixture layer and a sheet-type porous metal base material. At least a part of the porous metal base material, including one end portion facing the electrode mixture layer, is embedded in a surface layer of the electrode mixture layer and integrated with the electrode mixture layer. The other end portion of the porous metal base material is exposed on the surface of the electrode. The electrochemical device of the present invention includes an exterior body having a conductive path leading to the outside and the electrode stacked body of the present invention. The porous metal base material on the surface of at least one electrode of the electrode stacked body is brought into contact with the conductive path, providing electrical conduction between the electrode and the conductive path.

The invention relates to the technical field of batteries, in particular to an electrode assembly, a preparation method and a lithium ion battery, the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm, the positive pole piece comprises a positive current collector and a positive active material layer, and the positive active material layer comprises a positive active material layer and an inorganic coating; the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material, and the positive electrode active material comprises a ternary positive electrode material of which the core nickel content is more than 80 at% and the shell manganese content is 10-20 at%; the negative active material comprises silicon-based active particles and a three-dimensional elastic conductive network layer coating at least part of the surface of the silicon-based particles, and the positive active material and the negative active material are improved, so that various properties of the electrode assembly are good and stable, the overall electrical property and safety of the battery are improved, and the cycle life of the battery is prolonged.

The invention provides an electrode preparation method and system, an electrode and a battery. The electrode preparation method comprises the following steps: freezing and embrittling a binder; the binding agent is smashed into binding agent powder; mixing the binder powder with an active substance to form a mixed material; the mixed material is subjected to pre-fibration, and a pre-fibration material is formed; carrying out roll forming on the pre-fibration material to form an electrode diaphragm; and compounding the electrode diaphragm with a current collector to form the electrode. According to the electrode preparation method disclosed by the invention, the adhesive is frozen and embrittled, so that the toughness of the adhesive is remarkably reduced, and the brittleness of the adhesive is increased, and therefore, the adhesive can be uniformly crushed into fine particles, the mixing uniformity and the pre-fibration degree of the adhesive and other materials can be improved, and the uniformity of the thickness of the electrode is further effectively improved; and moreover, high-speed film formation of the electrode diaphragm is facilitated, the production efficiency of the electrode can be effectively improved, and meanwhile, the uniformity of electrode resistance can be ensured.

The invention provides a high-performance double-layer graphite negative electrode and a preparation method and application thereof. The invention provides an optimal configuration design of a double-layer graphite negative electrode, an upper layer (close to a diaphragm side) of the electrode is composed of energy type graphite, a lower layer (close to a current collector side) of the electrode is composed of power type graphite, an upper layer D50 is 12-50 microns, a lower layer D50 is 1-10 microns, preferably, the upper layer comprises a combination of primary particles and secondary particles of graphite, and the lower layer of the electrode comprises the primary particles of graphite. When the double-layer graphite negative electrode disclosed by the invention is applied to a battery system, the problem of lithium separation in the charging and discharging process of the battery can be effectively solved on the whole, and the cycle life of the battery is greatly prolonged, so that the graphite-based lithium ion battery has high energy density, high power density and long service life.

The invention discloses a preparation method of a self-supporting silicon-carbon electrode plate. The preparation method comprises the following steps of expanded graphite preparation, nitrogen doping, pore forming, silicon compounding and compression molding. The innovation of the invention is that the integrated pole piece with a three-dimensional elastic conductive network is constructed through the porous design of the nitrogen-doped expanded graphite matrix and the in-situ silicon coating and mould pressing integrated forming process. By doping the nitrogen element in the expanded graphite, the wettability of the pole piece to an electrolyte can be improved, pores of the expanded graphite can be used as transmission channels of ions between graphite sheet layers, and then by utilizing a microscopic two-dimensional sheet structure of the expanded graphite and direct molding through mold pressing, efficient compounding of graphite and silicon is realized, and preparation of the negative pole piece is completed in one step. The breakthrough of the thickness of the pole piece reaches the magnitude of 1 mm (far exceeding the level of tens of microns of a traditional current collector), and meanwhile, the pole piece has high rate performance and excellent cycle stability. Wherein the three-dimensional structure maintains the integrity of the electrode through a mechanical interlocking effect, and the structure has certain elasticity, so that the structure of the material is kept stable in a repeated expansion / contraction process caused by charging and discharging, and the capacity retention ratio is remarkably improved.

There is provided a triboelectric nanogenerator which includes a negative electrode, a negative tribolayer, a positive tribolayer, and a positive electrode. The positive tribolayer and the positive electrode are made of the same material. The material is a surfactant-protected ionic conductive material.

The invention discloses a water-based compensation sodium source sodium ion battery positive pole piece and a preparation method thereof. Mixing a positive active material, a conductive agent, a water-based binder, a water-soluble sodium supplement agent and a solvent to obtain positive slurry; wherein the water-soluble sodium supplement comprises sodium nitrite, sodium oxalate and sodium citrate; the solvent is water; and coating the surface of a current collector with the positive electrode slurry to prepare the positive electrode plate. Deionized water is used for replacing a traditional organic solvent to serve as a pulping solvent, and dual-function optimization is achieved by adding a specific water-soluble sodium supplementing agent. The sodium supplementing agent is uniformly distributed in the pole piece through a dissolution-recrystallization mechanism, and an efficient sodium ion pre-compensation system is formed. According to the method, the production cost and the energy consumption are remarkably reduced, the structural degradation of the positive active material in a water system environment can be effectively inhibited, irreversible sodium loss caused by formation of a first-week solid electrolyte interface (SEI) of a negative electrode is counteracted through a sodium source compensation mechanism, and the method has remarkable environmental friendliness and industrial application value.

The invention provides a punching, laminating and thermal compounding all-in-one machine which comprises a positive electrode die-cutting machine, a positive electrode thermal compounding machine, a negative electrode die-cutting machine, a single-sided negative electrode die-cutting machine, a laminating machine, a laminated core hot-pressing detection machine and a laminated core tray loading and blanking machine, the positive electrode thermal compounding machine, the negative electrode die-cutting machine and the single-sided negative electrode die-cutting machine are respectively connected with the lamination machine, the lamination machine is connected with the laminated core hot-pressing detection machine, and the laminated core hot-pressing detection machine is connected with the laminated core tray loading and blanking machine. The production efficiency and the qualified rate of finished products are effectively improved; a plurality of pieces are formed at a time through die cutting by firstly cutting into one section and then positioning by a CCD (Charge Coupled Device), so that less waste is generated, and the die cutting precision of positive and negative pole pieces is high; the positive electrode thermal compounding machine adopts a flat pressing mode; the lamination machine adopts a one-time lamination mode, the lamination efficiency is high, the laminated core is subjected to pressure maintaining in the whole process, and the laminated core hot-pressing detection machine adopts a rotating disc type rubberizing mode.

The application discloses a coating system and a coating method. The coating system determines a target roll to be wound based on state parameters of each chuck in a winding device for clamping the roll; and controls the winding device to change the roll in order to wind the material by the target roll when it is determined that the current coating process parameters meet the roll changing condition. The state parameters of each chuck, the coating process parameters and the roll changing condition are used to automatically switch the winding device to wind the material by the target roll, thereby greatly improving the automation degree of roll changing.

To provide an anode for all-solid secondary batteries of which the resistance value is low, a manufacturing method thereof, and an all-solid secondary battery using the anode.SOLUTION: An anode of all-solid secondary batteries comprises a compact of an anode mixture containing an anode material including an anode active material and a solid electrolyte. The anode material contains a carbon material as the anode active material, a layer containing an oxide having lithium ion conductivity is formed on the surface thereof, the amount of the oxide with respect to 100 pts.mass of the carbon material is 1 pt.mass or more, and a sulfide-based solid electrolyte is contained as the solid electrolyte. An all-solid secondary battery comprises a cathode, an anode and a solid electrolyte layer, which is interposed between the cathode and the anode, and includes the anode for all-solid secondary batteries as the anode.SELECTED DRAWING: Figure 1

The invention discloses a preparation method of a rate type sodium-ion battery pole piece and a sodium-ion battery, the sodium-ion battery pole piece comprises a positive pole piece and a negative pole piece, and the preparation method is characterized by comprising the following steps: S1, preparation of positive bottom layer slurry and positive top layer slurry, S2, preparation of negative bottom layer slurry and negative top layer slurry, and S3, preparation of a rate type sodium-ion battery pole piece. S3, double-chamber linkage coating, S4, three-section type gradient drying and S5, sectional type gradient rolling. The preparation method of the multiplying power type sodium ion battery pole piece and the sodium ion battery have the characteristics of high ion transmission efficiency, good volume stability, strong process applicability and excellent electrochemical performance.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a dry battery pole piece, a preparation method thereof and a battery comprising the pole piece, and the method comprises the following steps: S1, preparing a composite current collector; s2, preparing an electrode film: S21, preparing a positive electrode film, and S22, preparing a negative electrode film; s3, preparing a pole piece green body: sequentially laminating the positive electrode film, the composite current collector and the negative electrode film, and carrying out gradient pressure rolling at 120-180 DEG C, linearly increasing the pressure from 5-10MPa at the edge to 15-20MPa at the center, and controlling the rolling speed to be 1-3m / min, so as to form the pole piece green body; and S4, preparing the dry-method battery pole piece. The composite current collector adopts a three-layer substrate structure of a metal substrate layer, mesoporous carbon, an MOF composite transition layer and a conductive polymer transition layer, gradient pores are formed through laser drilling, and an AlO nano coating is deposited to enhance interface bonding.

The invention relates to the technical field of batteries, and particularly discloses a low-porosity solid-state battery negative electrode and a preparation method thereof.The negative electrode slurry of the negative electrode comprises a polymer electrolyte A and a small molecule mixture B. The polymer electrolyte A is obtained by polymerizing an acrylic acid monomer, an acrylonitrile monomer and a sulfydryl-containing monomer; the small molecule mixture B at least comprises a flexible chain segment, fluorinated acrylate, a lithium salt, a plasticizer and a free radical initiator. In-situ polymerization is carried out in the coating process of the small molecule mixture B to generate a self-adaptive pore polymer electrolyte so as to reduce pores, and the polymer electrolyte A not only can improve the conversion rate of in-situ polymerization of the small molecule mixture B, but also can interact with the small molecule mixture B to form a dynamic cross-linked network for improving the stripping force of the pole piece; under the synergistic effect, the negative electrode / solid electrolyte interface contact is optimized, and the problems of poor interface contact and large interface impedance between the negative electrode active material and the solid electrolyte of the existing solid-state battery are solved.

The invention relates to the technical field of lithium ion batteries, in particular to a negative plate, a battery and a preparation method of the battery. The negative plate comprises a negative current collector, a first coating layer and a second coating layer. The first coating layer is coated on the negative electrode current collector and takes a silicon-based negative electrode material as an active material; the second coating layer is coated on the surface of the first coating layer and takes a composite material of a porous carbon material and a fast ion conductor as an active material. By adding the fast ion conductor, the defect of low ionic conductivity of a silicon system material is improved, and an ion transmission channel is increased; and meanwhile, side reaction between the electrolyte and the silicon-based negative electrode is avoided, the interface impedance is reduced, and the risks of pole piece pulverization and lithium separation are reduced. The first coating layer is provided with the groove, and the second coating layer constructs a three-dimensional hard matrix protection barrier for the first coating layer, inhibits and buffers the volume expansion of the silicon material, slows down the capacity attenuation of the battery cell, and prolongs the cycle life of the battery cell. The invention also provides a battery and a preparation method thereof.