283results about "Electrode molding" patented technology

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 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 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 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 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 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.

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 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.

The embodiment of the invention provides a preparation method of a high-load electrode with a vertical pore channel structure and a battery, which comprises the following steps: grinding and premixing carbon fluoride and a conductive carbon material in proportion, adding a binder, carrying out high-speed ball milling to obtain fiberized powder, and rolling to prepare an electrode material, thereby obtaining the high-load electrode with the vertical pore channel structure. Compounding the carbon fluoride with a current collector through hot rolling to obtain a positive pole piece; and finally, carrying out laser pore-forming treatment on the positive pole piece to obtain the high-load carbon fluoride electrode with a vertical pore channel structure. The pore diameter of the pore channel structure is 10-100 [mu] m, the pore pitch is 1-10 times of the thickness of the electrode material, the pore depth is 50-100% of the thickness of the electrode material, the ion tortuosity of the electrode is effectively reduced and the ion transmission efficiency is improved by constructing a vertical pore channel, meanwhile, high-energy laser induces an in-situ defluorination reaction on the pore wall to generate a high-conductivity sp2 carbon phase, and the conductivity of the electrode is improved. And the limitation of sacrifice conductivity of a mechanical pore-forming technology is broken through.

This invention discloses a method for preparing a self-supporting silicon-carbon electrode sheet, comprising the following steps: preparation of expanded graphite, nitrogen doping, pore formation, silicon composite, and molding. Its innovation lies in: through the porous design of the nitrogen-doped expanded graphite matrix, combined with in-situ silicon coating and integrated molding process, an integrated electrode sheet with a three-dimensional elastic conductive network is constructed. By doping expanded graphite with nitrogen, the wettability of the electrode sheet to the electrolyte can be improved. The pores in the expanded graphite can serve as ion transport channels between graphite layers. Then, utilizing the microscopic two-dimensional sheet structure of expanded graphite, direct molding is achieved to realize efficient composite of graphite and silicon and complete the preparation of the negative electrode sheet in one step. This results in a breakthrough electrode sheet thickness reaching the 1mm level (far exceeding the tens of micrometers level of traditional current collectors), while also possessing high rate performance and excellent cycle stability. The three-dimensional structure maintains electrode integrity through a mechanical interlocking effect, and the structure has a certain degree of elasticity, allowing the material to maintain structural stability during repeated expansion / contraction caused by charging and discharging, significantly improving capacity retention.

The application relates to the technical field of battery pole pieces, in particular to a pole piece composite continuous production equipment. The equipment comprises a first electrode film piece supply device, a second electrode film piece supply device, a foil unwinding and output device, a first composite device and a second composite device. The first electrode film piece supply device is used for production and output of a first electrode film piece; the second electrode film piece supply device is used for production and output of a second electrode film piece; the foil unwinding and output device is used for output of a foil; the first composite device is used for receiving the first electrode film piece and the foil, and compositing the first electrode film piece to a first side of the foil to obtain a single-side composite pole piece; and the second composite device is used for receiving the single-side composite pole piece and the second electrode film piece, and compositing the second electrode film piece to a second side of the foil to obtain a double-side composite pole piece.

Provided is a positive electrode for a lithium metal rechargeable battery, comprising: a current collector; a positive electrode active material layer formed on the current collector; and a polymer-containing coating layer disposed on the positive electrode active material layer; wherein the polymer-containing coating layer comprises an ion-conductive polymer including an alkylene oxide segment. The resulting battery, when paired with a lithium metal negative electrode and separator, offers enhanced mechanical stability and improved cycle performance, making it suitable for vehicle applications.

An all-solid-state battery according to the present disclosure includes: a solid electrolyte layer; the solid electrolyte layer is arranged between the positive electrode layer and the negative electrode layer, the positive electrode layer comprises a positive electrode active material and a solid electrolyte, the negative electrode layer comprises a negative electrode active material and a solid electrolyte, and the positive electrode layer and / or the negative electrode layer comprises an oxide of a sintering aid. And the solid electrolyte is an amorphous solid electrolyte including Li (lithium) oxide, Si (silicon) oxide, B (boron) oxide, or a combination thereof.

This application discloses a coating system and a coating method. The coating system determines a target reel to be wound based on state parameters of chucks for clamping reels in a winding apparatus (11); and when it is determined that current coating process parameters satisfy a reel change condition, the winding apparatus (11) is controlled to change reels to wind a material using the target reel. Through the state parameters of the chucks, the coating process parameters, and the reel change condition, automatic switching to the target reel for winding the material in the winding apparatus is achieved, significantly improving the automation level of reel change.

The invention relates to the technical field of lithium battery positive pole pieces, in particular to a positive pole piece and a preparation method thereof and a lithium ion battery, an active coating composed of a positive active material, a functional material, a conductive agent and a binder is arranged on the positive pole piece, the conductive agent comprises conductive carbon black and a carbon nanotube, and the functional material is a carbon nanotube. The functional material has reversible absorption and release effects of active oxygen, the ratio D1 of the median particle size of the positive electrode active material to the median particle size of the functional material is more than or equal to 50 and less than or equal to 250, and the ratio D2 of the median particle size of the functional material to the primary particle size of the conductive carbon black is more than or equal to 0.5 and less than or equal to 5. A three-dimensional composite oxygen substance electron transmission channel is constructed in the positive pole piece provided by the invention, so that the oxygen absorption efficiency of a functional material is improved, oxygen precipitation of the positive pole material under high voltage is inhibited, oxygen release deterioration of electrolyte and oxygenolysis of a negative pole solid electrolyte membrane is prevented, the cycle stability of the lithium ion battery is favorably improved, and the service life of the lithium ion battery is prolonged. The storage life is prolonged and the safety performance is enhanced.

The present invention relates to VDF-based fluoropolymers with excellent metal adhesion properties for use as binders for electrodes for batteries.

This invention provides a low-resistivity negative electrode for an all-solid-state secondary battery, a method for manufacturing the same, and an all-solid-state secondary battery using the aforementioned negative electrode. This invention relates to Sustainable Development Goals (SDGs) 12, 3, 7, and 11. The all-solid-state negative electrode of this invention is characterized by having a molded body containing a negative electrode mixture comprising a negative electrode material including a negative electrode active material and a solid electrolyte. The negative electrode material contains a carbon material having a layer of an oxide with lithium-ion conductivity formed on its surface as the negative electrode active material, wherein the amount of the oxide is 1 part by mass or more relative to 100 parts by mass of the carbon material, and a sulfide-based solid electrolyte is included as the solid electrolyte. Furthermore, the all-solid-state secondary battery of this invention is characterized by having a positive electrode, a negative electrode, and a solid electrolyte layer between the positive and negative electrodes, thus forming the negative electrode of this invention.

This invention discloses an ultralight lithium-containing self-supporting foil, its preparation method, and a lithium secondary battery using it as the negative electrode. The invention yields an ultralight lithium-containing self-supporting foil with excellent mechanical strength and ductility. This foil is a lithium-containing alloy with a dual-phase structure, consisting of a lithium solid solution phase and an intermetallic compound phase. The lithium solid solution phase uses lithium as a solvent and other elements A that are soluble in lithium as solutes. The intermetallic compound phase is a compound alloy formed by a second phase element B and lithium metal. This material can be cast and rolled into foil for use as a self-supporting electrode in a lithium secondary battery, eliminating the need for copper foil support and achieving a thickness as thin as less than 50 μm, with a weight of 6.5 g / m³. 2 Furthermore, this foil material can transform the lithium deposition mechanism into a reversible charge-discharge mechanism of lithium solid solution-deintercalation (solid solution-desolution), allowing it to replace pure lithium strips or lithium-copper composite strips as the negative electrode of secondary batteries, thus significantly improving battery cycle life and safety.

The invention relates to the technical field of powder pressure forming, and provides a pole piece pressing device which comprises a press machine, a pressing assembly, a supporting assembly, a lifting assembly, a conveying and positioning assembly and a mold assembly. The pressing assembly is installed in the middle of the lower surface of a driving sliding block of the press machine. A supporting assembly and a lifting assembly are fixedly connected to the upper surface of a base of the press, the supporting assembly and a pressing assembly are oppositely arranged, and the axis of the supporting assembly coincides with the central axis of the pressing assembly; the conveying and positioning assembly penetrates through an opening between a driving sliding block of the press machine and the base and is in sliding connection with the lifting assembly. The mold assemblies are arranged on the conveying and positioning assembly. The conveying and positioning assembly is used for automatically conveying and positioning the mold, the pressing machine is used for automatically pressing, and stripping is automatically completed at the pressing position without secondary pressing of the pole piece; the device has the advantages of being small in occupied area, low in cost, high in universality and high in working efficiency.

The invention provides an all-solid-state positive pole piece as well as a preparation method and application thereof. The all-solid-state positive pole piece at least comprises a current collector, a positive pole piece and a negative pole piece, the all-solid-state positive electrode layer is at least arranged on one surface of the current collector, the all-solid-state positive electrode layer comprises a positive electrode active material and a solid-state electrolyte, the median particle size X of the solid-state electrolyte is 20-50 microns, and the ion transmission tortuosity in the all-solid-state positive electrode plate is 3-5. According to the all-solid-state positive pole piece as well as the preparation method and the application thereof provided by the invention, the ion transmission tortuosity in the positive pole piece can be reduced, so that the rate capability and the cycle performance of an all-solid-state battery are improved.

The invention discloses a pole lug flattening device and pole piece winding equipment, the pole lug flattening device is applied to the pole piece winding equipment, a roller passing assembly used for winding a pole piece is arranged in the pole piece winding equipment, and the pole piece flattening device comprises a driving mechanism, a first flattening assembly, a second flattening assembly and a supporting assembly; the supporting assembly is suitable for being arranged on the roller passing assembly in a sleeving mode, the first smoothing assembly and the second smoothing assembly are arranged on the two sides of the supporting assembly correspondingly, and the first smoothing assembly, the second smoothing assembly and the supporting assembly define a smoothing space; the driving mechanism is arranged on one side of the supporting assembly and connected with the supporting assembly. The first smoothing assembly and the second smoothing assembly are connected with the driving mechanism, and the driving mechanism can drive the first smoothing assembly and the second smoothing assembly to move so that the first smoothing assembly and the second smoothing assembly can be oppositely unfolded or folded. Therefore, when the pole piece is penetrated, the first smoothing assembly and the second smoothing assembly are opened to enlarge the smoothing space, so that the pole piece can be smoothly introduced, and the pole piece penetrating process is simplified.

A method of manufacturing an all-solid-state battery includes forming an anode active material layer on surfaces of an anode current collector, forming a first solid electrolyte layer covering exposed surfaces of the anode active material layer to form a symmetrical electrode structure, pressing the structure at a preliminary pressing pressure lower to form an anode, forming a cathode active material layer on a surface of cathode current collectors, the cathode active material layer being smaller than the cathode current collectors, forming a second solid electrolyte layer covering the cathode active material layers and the cathode current collectors to form first and second cathodes, forming a laminate by laminating the cathodes on opposite surfaces of the anode, the second solid electrolyte layers of the cathodes facing the anode, and pressing the laminate at the final pressing pressure.

The application provides a flexible paper-based electrode and a preparation method and application thereof, and comprises the following steps: step (1), dispersing lithium iron phosphate powder, a surfactant, plant fibers, a conductive agent and nanofibers in deionized water to obtain a mixed slurry; and step (2), vacuum filtering the obtained slurry, and then performing vacuum hot-pressing dehydration to obtain a flexible lithium iron phosphate paper-based electrode. On the basis of taking into account the mechanical strength, flexibility, conductivity and electrochemical performance of the paper-based electrode, the adaptability of the paper-based electrode preparation process to the traditional papermaking process is effectively improved, and the prepared paper-based electrode has excellent comprehensive performance, and is expected to realize large-scale industrialized production.

Aspects relate to patterned nanostructures having a feature size not including film thickness of below 5 microns. The patterned nanostructures are made up of nanoparticles having an average particle size of less than 100 nm. A nanoparticle composition, which, in some cases, includes a binder, is applied to a substrate. A patterned mold used in concert with electromagnetic radiation function to manipulate the nanoparticle composition in forming the patterned nanostructure. In some embodiments, the patterned mold nanoimprints a pattern onto the nanoparticle composition and the composition is cured through UV or thermal energy. Three-dimensional patterned nanostructures may be formed. A number of patterned nanostructure layers may be prepared and joined together. In some cases, a patterned nanostructure may be formed as a layer that is releasable from the substrate upon which it is initially formed. Such releasable layers may be arranged to form a three-dimensional patterned nanostructure for suitable applications.

This disclosure relates to an active material structure, an electrode structure therein, a secondary battery therein, and a method for manufacturing the same. The active material structure includes a first active material line arranged in a first direction, a second active material line arranged in a second direction intersecting the first direction, and an intermediate active material line between the first and second active material lines in a third direction intersecting the first and second directions. The intermediate active material line is provided in the overlapping region of the first and second active material lines, wherein the upper and second active material lines are electrically connected via the intermediate active material line.

The invention discloses an electrode plate, a preparation method thereof and an electrochemical device. The preparation method of the electrode plate comprises the following steps: mixing an electrode active material, a solvent and a dispersing agent to obtain a first mixture; a first monomer, an initiator and a conductive agent are added into the first mixture, a second mixture is obtained, the first monomer is used for polymerization to form a high polymer material, and the first monomer contains a polar group; stirring and heating the second mixture, so that the first monomer is subjected to in-situ polymerization on the surface of the electrode active material to form a polymer material layer containing a polar group, and the conductive agent is dispersed in the polymer material layer to obtain an electrode material; mixing an electrode material and a binder to obtain electrode slurry; and coating a current collector with the electrode slurry, and carrying out drying and rolling to obtain the electrode plate. According to the preparation method provided by the invention, the conductivity of the electrode plate can be improved, and the dissolution of transition metal ions in the electrode plate is inhibited.