2924results about "Active material electrodes" patented technology

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention provides an electrochemical device and an electronic device comprising the same, the electrochemical device comprises a positive pole piece, the positive pole piece comprises a current collector and a positive pole material layer located on at least one surface of the current collector in the thickness direction, the positive pole material layer comprises a first positive pole material layer and a second positive pole material layer, the second positive electrode material layer is located between the first positive electrode material layer and the current collector, the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises two or more than two nickel cobalt lithium manganate ternary materials, the two or more than two nickel cobalt lithium manganate ternary materials are divided into two groups, the chemical formula of the first group of lithium nickel cobalt manganate ternary materials is Lin1Nix1Coy1Mnz1M1m1O2, x1 + y1 + z1 + m1 is equal to 1 and smaller than or equal to 0.60, the chemical formula of the second group of lithium nickel cobalt manganate ternary materials is Lin2Nix2Coy2Mnz2M2m2O2, x2 + y2 + z2 + m2 is equal to 1 and larger than 0 and smaller than or equal to 0.14, and the two groups of lithium nickel cobalt manganate ternary materials are located in the first positive electrode material layer and the second positive electrode material layer respectively.

The invention provides an electrode plate and a preparation method thereof, a battery and electric equipment, the electrode plate comprises an electrode current collector and an electrode coating located on at least one side surface of the electrode current collector, and the electrode coating comprises an electrode active material; in the length direction of the electrode coating, the electrode coating comprises a center area and edge areas located on the two opposite sides of the center area, and the OI value of an electrode active material of the center area is smaller than the OI value of an electrode active material of the edge areas. According to the invention, the current distribution uniformity of the electrode plate in the battery cycle process can be improved, and the cycle life of the battery is prolonged.

The invention provides a preparation method of a bipolar current collector based on a selective double-sided modified masking film. The preparation method comprises the following steps: depositing a Ni-Cr alloy layer on a single side surface of an aluminum substrate; one side of the masking film is etched to form a roughened surface, and the other side of the masking film is hydrophobic to form a hydrophobic surface; the roughened surface of the masking film and the surface, without the Ni-Cr alloy layer, of the aluminum matrix are pressed, and the edge is coated with curing glue; and placing the pressed and glued sample in an electroplating solution to electroplate a copper layer, finally cutting off an edge glue sealing area, and stripping the masking film. According to the preparation method, the masking film used for protecting the back surface of the aluminum substrate is subjected to double-sided differential treatment, the edge sealing technology is matched, and the Ni-Cr alloy is adopted for bottoming, so that the adhesive force between the copper plating layer and the aluminum substrate is improved, the risk of causing corrosion of a primary battery is reduced, the bipolar current collector which is firmly combined and has a pure interface can be prepared, and the service life of the bipolar current collector is prolonged. And a feasible solution is provided for realizing light-weight and high-performance current collectors for electronic devices such as lithium batteries and the like.

The utility model provides a pole piece, an electrode assembly and a battery cell, and relates to the technical field of batteries. The pole piece comprises a current collector, an active material layer and a tab; the current collector comprises a main body and a protruding part which protrudes outwards from the edge part of the main body; the active material layer is arranged on the main body and the protruding part; the tabs are connected with the main body. The protruding part is arranged on the edge of the main body, so that the arrangement amount of the active material layer of the pole piece can be increased, the energy density of the electrode assembly can be improved, and the energy density of a battery cell can be improved.

The invention discloses a semi-dry method electrode and a preparation method thereof. The semi-dry method electrode preparation method is different from the existing wet method and dry method electrode preparation technology, on one hand, the atomized and dispersed conductive glue solution is formed by mixing the binder and the conductive agent and then atomizing and dispersing the mixture, and on the other hand, the electrode material is dispersed into suspended particles in the gas-phase medium; and then carrying out solid-liquid mixing and sedimentation on the obtained atomized and dispersed conductive adhesive solution and suspended particles to form an aggregate, collecting the obtained aggregate, spreading and compounding on a current collector, and drying. In the process of carrying out solid-liquid mixing and sedimentation on the conductive glue solution and the suspended particles to form the aggregate, as the binder can be in full contact with and coats the surface of the active material, a better bonding effect can be realized, the usage amount of a solvent and the binder is reduced while the bonding effect is ensured, less solvation is realized, and the service life of the conductive glue solution is prolonged. The energy consumption is low, the pole piece mechanical strength is higher, the loading capacity is higher, the active material structure is not damaged, and the advantages of a wet method and a dry method are achieved.

A method for manufacturing an electrode for a secondary cell, comprising the steps of: providing an electrode substrate comprising an electrically conducting material; forming an active layer on the electrode substrate, wherein the active layer comprises a plurality of carbonaccous particles; exposing the active layer to a magnetic field configured to orient a majority of the particles along a normal of the substrate; and exposing the active layer to laser pulses or mechanical rollers to form a plurality of passages in the active layer, thereby facilitating ionic transport towards the substrate.

A dual slot die coater including a lower slot and an upper slot, for extrusion coating of an electrode active material slurry on a surface of a continuously moving current collector. The dual slot die coater includes a lower plate, an intermediate plate positioned on the lower plate and an upper plate positioned on the intermediate plate, the lower slot being formed between the lower plate and the intermediate plate, and the upper slot being formed between the intermediate plate and the upper plate, wherein the lower plate, the intermediate plate and the upper plate have a lower die lip, an intermediate die lip and an upper die lip, each forming an front end with respect to the current collector, respectively, and a thickness of the lower die lip is larger than a thickness of the upper die lip and a thickness of the intermediate die lip.

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 a modified zinc negative electrode and an aqueous zinc ion battery comprising the same, the modified zinc negative electrode comprises a negative electrode current collector, at least one surface of the negative electrode current collector is provided with a modified coating, and the modified coating comprises a rare earth-based metal organic framework material and a binder. In the modified coating, the rare earth-based metal organic framework material changes the microstructure of the zinc negative electrode and homogenizes the surface electric field and ion flow of the zinc negative electrode, so that disordered deposition of zinc ions can be blocked, a uniform transmission channel can be provided for the zinc ions, growth of zinc dendritic crystals and dead zinc accumulation on the surface are inhibited, and the zinc negative electrode has the advantages of high corrosion resistance and high corrosion resistance. And meanwhile, direct contact between the electrolyte and the zinc negative electrode can be effectively avoided, and hydrogen evolution side reaction and electrode corrosion are inhibited, so that the cycle performance of the aqueous zinc battery is improved.

A nanocomposite electrode including a substrate, a binding compound, a conductive additive, and NiO / Fe2VO4 nanoparticles. The NiO / Fe2VO4 nanoparticles have a substantially spherical shape. A mixture of the binding compound, the conductive additive and the NiO / Fe2VO4 nanoparticles, is at least partially coated on a first surface of the substrate. A method of making the NiO / Fe2VO4 nanoparticles is described.

The invention belongs to the field of electrochemistry, and discloses a positive electrode material V2O3 / C of a rechargeable aqueous zinc ion battery, an electrode plate of the positive electrode material V2O3 / C and a preparation method of the positive electrode material V2O3 / C. A carbon-coated vanadium trioxide nano material is obtained by adopting hydrothermal synthesis and calcination and is applied to a positive electrode of the rechargeable aqueous zinc ion battery. The material is simple and convenient to synthesize and low in cost, and shows relatively high specific capacity and excellent rate capability and cycling stability when being used as a zinc ion battery positive electrode material, so that the selection of water system energy storage battery materials is more diversified.

The invention belongs to the technical field of battery processing, and discloses a roll core and a full-tab cylindrical battery. The roll core is formed by winding a positive plate, a diaphragm, a negative plate and a diaphragm which are stacked in sequence, a through hole is formed in the center of the roll core, a positive electrode active material and a first blank foil located at the axial end part of the roll core are arranged on a positive electrode foil of the positive plate, and at least the first blank foil is bent towards the center of the roll core and is overlapped to form a flat surface; the roll core further comprises a first insulating coating, at least the outer side of the positive plate is coated with the first insulating coating, the starting end of the first insulating coating is flush with the starting end of the first blank foil, the distance between the top of the first blank foil and the top of the negative plate is L, and the distance between the upper boundary of the first insulating coating and the top of the negative plate is L1, the inward bending width of the first blank foil is defined as W, and L / 3 < = L1 < = L-W. The roll core and the full-tab cylindrical battery can effectively prevent the blank foil of the positive electrode from being bent outwards at the starting end to be in contact with the negative plate to cause short circuit, and the qualification rate of the roll core is improved.

The invention discloses a carbon nanofiber / porous carbon microsphere-based positive electrode and negative electrode for a zinc ion battery, which are structurally characterized in that a three-dimensional network carbon nanofiber skeleton and honeycomb porous carbon microspheres form a composite conductive carrier; the positive electrode adopts an interconnected conductive network formed by overlapping carbon nanofibers loaded with manganese dioxide nanosheets on the surfaces and honeycomb porous carbon microspheres embedded with manganese dioxide inside; and a metal zinc layer is deposited on the surface of the same carrier for the cathode. The preparation method mainly comprises the following steps: preparation of a carbon nanofiber / honeycomb porous carbon sphere composite membrane, preparation of a manganese dioxide composite positive electrode material by a hydrothermal method, and preparation of a zinc composite negative electrode material by a constant current deposition method. According to the design, the ion transmission efficiency is improved through the three-dimensional hierarchical pore structure, the conductivity is enhanced through the carbon network, the problems of poor structural stability, fast capacity fading and the like of the zinc ion battery electrode material are effectively solved, and the cycle performance and the rate capability of the battery can be remarkably improved.

The present invention provides a nano-scale sodium ferrophosphate doped with aluminum. 3+ , the sodium iron phosphate is a ferrophosphate nano-ore structure, and the particle size of the sodium iron phosphate is 50-700nm; the present invention also provides a method for preparing nano-scale ferrophosphate nano-ore type aluminum-doped sodium iron phosphate, comprising the following steps: grinding a phosphorus source, a sodium source, an iron source, and an aluminum source to obtain a mixed precursor, and sintering the mixed precursor to obtain a nano-scale ferrophosphate nano-ore type aluminum-doped sodium iron phosphate. The present invention also provides an application of a nano-scale ferrophosphate nano-ore type aluminum-doped sodium iron phosphate as a positive electrode material for preparing a sodium ion battery. The nano-scale ferrophosphate nano-ore type aluminum-doped sodium iron phosphate of the present invention is a positive electrode material for polyanion sodium ion batteries, which improves the electronic conductivity and energy density of sodium iron phosphate by doping, providing a positive electrode material for the next step of preparing a safer, more environmentally friendly, and low-cost sodium ion battery.

The invention discloses a negative pole piece, an electrochemical device and electronic equipment. The negative pole piece (100) comprises a negative current collector (101), a first film layer (110) and a second film layer (120). The first film layer (110) comprises a first negative electrode active material, and the first negative electrode active material is graphite; the second film layer (120) comprises a second negative electrode active material, and the second negative electrode active material comprises a silicon carbon material; relative to the second film layer (120), the first film layer (110) is close to the surface of the negative electrode current collector (101). The mass percentage content of the Si element in the second film layer (120) is W1; a plurality of strip-shaped grooves (122) are formed along the surface of the second film layer (120); the ratio of the width of the groove (122) to the width of the groove interval (121) is K, and K is larger than or equal to 0.2 and smaller than or equal to 0.6; k and W1 satisfy 2.4 < = K / W1 < = 4.

The present invention relates to: a positive electrode for a lithium-sulfur secondary battery, the positive electrode having improved lifespan performance; a method for manufacturing same; and a lithium-sulfur secondary battery comprising same. Specifically, the present invention relates to: a positive electrode for a lithium-sulfur secondary battery, the positive electrode having an improved cycle life and calendar life due to suppressing the shuttling of polysulfide compounds; a method for manufacturing same; and a lithium-sulfur secondary battery comprising same.

The invention provides a lithium manganese iron phosphate material, a preparation method thereof, a positive pole piece and a lithium ion battery. The preparation method of the lithium manganese iron phosphate material comprises the following steps: sequentially mixing and sintering a manganese iron phosphate precursor, a manganese iron pyrophosphate precursor, a lithium source, a carbon source and an organic additive to obtain the lithium manganese iron phosphate material, the ferromanganese phosphate precursor is in an amorphous state; the crystal structure of the ferromanganese pyrophosphate precursor is a monoclinic system; the organic additive is a polymer of which the molecular structure carries an anionic functional group; sintering comprises first-stage sintering, second-stage sintering, third-stage sintering, fourth-stage sintering and fifth-stage sintering which are performed in sequence. According to the invention, the unique properties of the amorphous ferromanganese phosphate precursor and the monoclinic system ferromanganese pyrophosphate precursor are utilized, and the special organic additive and the five-stage sintering process are combined, so that the particle filling effect in the sintering process is enhanced, and the purpose of optimizing the particle gradation and the element distribution uniformity is achieved.

The present application belongs to the technical field of batteries. Provided are a battery cell, a battery and an electric device. The battery cell comprises a battery electrode sheet. The battery electrode sheet comprises a current collector, an active layer, a first insulating layer and a second insulating layer, wherein a connecting surface is formed on the current collector; the active layer covers part of the connecting surface, and a first edge is formed on the connecting surface; the first insulating layer covers part of the connecting surface, and the first insulating layer is arranged to extend along the first edge; and the second insulating layer covers the first insulating layer. The present application aims to reduce the risk of burr exposure during electrode sheet die-cutting, thereby reducing the risk of short circuits in battery cells.

The embodiment of the invention provides a pole piece, an electrode assembly, a battery monomer, a battery and electric equipment. The pole piece is applied to the battery. The pole piece comprises a current collector and an active material layer. The current collector defines a coating area coated with an active material layer and a tab area not coated with the active material layer. The coating area comprises a main body area and a punching area arranged between the main body area and the tab area, and one or more holes are formed in the current collector in the punching area. The coating area comprises the main body area and the punching area located between the main body area and the tab area, and the current collector of the punching area is provided with one or more holes, so that the extension rate of the punching area can be reduced in the cold pressing process of the pole piece; according to the invention, the condition that the elongation rates of the coating area and the tab area are not matched is improved, so that the tab area is improved to form a crescent-shaped bending and wave shape, and the condition that the tab area is folded or wrinkled in the winding process of the pole piece is improved.

The invention belongs to the technical field of battery processing, and discloses a roll core and a full-tab cylindrical battery. The roll core is formed by winding a positive plate, a diaphragm, a negative plate and a diaphragm which are stacked in sequence, a through hole is formed in the center of the roll core, a coating layer and a first blank foil located at the axial end part of the roll core are arranged on a positive foil of the positive plate, and at least the first blank foil is bent towards the center of the roll core and is overlapped to form a flat surface; the roll core further comprises an insulating tape, the insulating tape is attached to at least the outer side of the positive plate, the starting end of the insulating tape is flush with or close to the front of the starting end of the positive plate, the distance between the top of the first blank foil and the top of the negative plate is L, the distance between the upper boundary of the insulating tape and the top of the negative plate is L1, the inward bending width of the first blank foil is defined as W, and L / 3 < = L1 < = L-W. The blank foil of the positive electrode can be effectively prevented from being bent outwards at the starting end and making contact with the negative plate to cause short circuit, and the qualified rate of the roll core is increased.

The invention discloses a hydrogel-based high-voltage aqueous lithium ion fiber battery and a preparation method thereof, and the fiber battery adopts a positive and negative electrode parallel structure and comprises a fiber positive electrode, a fiber negative electrode and a functional hydrogel electrolyte. The functional hydrogel electrolyte is of a three-dimensional network structure formed by a polymer and contains a combination of a low-concentration lithium salt and a functional additive, the polymer can be bonded with free water to reduce the reaction activity of water, and the functional additive can adjust the solvation structure of lithium ions and change the components of a solid electrolyte interface film (SEI) on the surface of a negative electrode, so that the solid electrolyte interface film (SEI) is formed. The two effects are synergistically coupled, and the high electrochemical stability window electrolyte exceeding 3.3 V is realized. The prepared water-based lithium ion fiber battery has a 2.5 V high-voltage platform and excellent mechanical flexibility, the electrolyte leakage problem of the water-based battery is solved through the design of the quasi-solid electrolyte, the energy density and safety of the water-based lithium ion fiber battery are improved, and application of the flexible water-based battery in the field of wearable electronics is promoted.

The utility model relates to the technical field of batteries, and provides a battery cell and a battery, and the battery cell comprises a positive plate, a diaphragm and a negative plate which are wound and stacked; the negative plate comprises a negative current collector and a negative active material layer located on the negative current collector, and a plurality of negative tabs protrude out of one side of the negative current collector and are laminated to form a negative tab structure; the positive plate comprises a positive current collector and positive active material layers, and the positive active material layers are arranged on two opposite sides of the positive current collector; the positive active material layer is provided with a first empty foil area and a second empty foil area, a first tab of the positive plate is positioned in the first empty foil area and connected with the positive current collector, and a second tab is positioned in the second empty foil area and connected with the positive current collector; and the first tab and the second tab are positioned on the two sides of the negative tab structure along the second direction. Through the arrangement, the bending space ratio of the first tab, the second tab and the negative tab at the top of the battery cell is reduced, the space ratio of the battery cell is reduced, and the energy density of the battery cell is improved.

The invention provides an electrode plate and a preparation method thereof, a battery, a battery pack and electric equipment. The electrode plate comprises an electrode current collector and an electrode coating positioned on at least one side surface of the electrode current collector, the degree of order u of the electrode coating is more than or equal to 1 and less than or equal to 1.85; # imgabs0 # R1 is the reflectivity of the electrode coating on the electrode plate under the incident light with the wavelength of lambda, and R2 is the reflectivity of powder formed by the electrode coating on the electrode plate under the incident light with the wavelength of lambda; wherein lambda is in a range of 750 nm to 4 [mu] m. The internal resistance of the battery can be reduced, and the rate capability and the fast charging performance of the battery are improved.

The present disclosure relates to an electrode for an electrochemical device, and more particularly, to a dry electrode and a method for manufacturing the same. According to an aspect of the present disclosure, there is provided a new method for manufacturing a dry electrode free of wrinkles in an uncoated portion having no electrode active material layer on a current collector.

A battery and an electronic device are disclosed. The battery includes: a first bare cell portion and a second bare cell portion. The first bare cell portion has a first surface and a side surface connected to the first surface, the first surface is configured to face towards a same direction as that of an opening of a battery compartment of an electronic device when the battery is installed in the battery compartment, and the side face is configured to face towards an inner side surface of the battery compartment of the electronic device when the battery is installed in the battery compartment. The second bare cell portion is located on a side that the first surface faces, and an orthographic projection of the second bare cell portion on the first surface overlaps the first surface.

A method of processing a battery including an electrode including pores filled with a gas involves applying a formation current to the battery, the formation current comprising at least one frequency attribute, the at least one frequency attribute based on an assessed dielectric attribute associated with wetting the pores with electrolyte. A method of processing a battery including a battery comprising an electrode involves applying a formation current to the battery comprising at least one frequency attribute, the at least one frequency attribute based on an assessed dielectric attribute associated with forming a solid electrolyte interphase (SEI) layer on the electrode.

Is provided a composite material comprising bio-based and bio-degradable and thermoplastic and insoluble polyesters, bio-based and bio-degradable and soluble or partially soluble polysaccharides and conductive carbon additives and optionally bio-based and natural poly-acids and / or bio-based and natural poly-bases and optionally other additives, and the process for the preparation thereof, wherein said material is used for the preparation of electrodes, to be used in electrochemical energy conversion devices and storage device comprising the electrode thereof.

The invention belongs to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a battery pole piece, and the battery pole piece comprises a current collector, an active layer, a first insulating layer and a second insulating layer; wherein a connecting surface is formed on the current collector, the active layer covers a part of the connecting surface, and a first edge is formed on the connecting surface; the first insulating layer covers a part of the connecting surface, and the first insulating layer extends along the first edge; the second insulating layer covers the first insulating layer. The invention aims to reduce the risk of burr exposure during die cutting of the pole piece, and further reduce the risk of short circuit of the single battery.

A battery cell, a battery, and an electrical device are disclosed. The battery cell includes an electrode assembly. The electrode assembly includes a first electrode plate. The first electrode plate includes a first substrate. The first substrate includes a first insulation layer at an edge of the first substrate.