2045results 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 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.

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.

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.

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 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 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.

The invention provides an MOF-rGO composite modified zinc negative electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing rGO dispersion liquid by taking GO as a raw material, and loading rGO in the rGO dispersion liquid to the surface of zinc foil by adopting an L-B self-assembly method to obtain rGO modified zinc foil; and carrying out first impregnation on the rGO modified zinc foil in a zinc salt solution, and then carrying out second impregnation in an organic ligand solution to obtain the MOF-rGO composite modified zinc negative electrode. Directional arrangement of rGO on the surface of the zinc foil is achieved through L-B self-assembly, the obtained rGO modification layer is compact and stable, MOF is synthesized on the surface of the material in situ without using a binder on the basis, growth of dendritic crystals is effectively inhibited through the synergistic effect that rGO provides a conductive network and MOF regulates and controls zinc ion diffusion, and the preparation method has the advantages that the preparation process is simple, and the preparation cost is low. Therefore, the cycle performance and the energy density of the battery are remarkably improved, the short circuit of the battery is reduced, and industrial mass production is adapted.

The invention provides a high-performance negative electrode coke production process, and belongs to the technical field of negative electrode material production processes, and the high-performance negative electrode coke production process comprises the following steps: mixing solvent oil and maltha raw materials according to a solvent ratio of 0.9-1.2: 1, mixing the solvent oil and the maltha raw materials, carrying out settling separation through a settling tank to produce light-phase oil, heating the light-phase oil through a heating furnace, and feeding the light-phase oil into a light-phase tower, refined asphalt is produced from the tower bottom; heating the refined asphalt, fractionating in a fractionating tower, and producing coker oil from the bottom of the fractionating tower; the method comprises the following steps: heating coking oil, feeding the heated coking oil into a coke tower, and carrying out variable-temperature variable-pressure operation in a coking process to generate high-performance negative coke; by strictly controlling the solvent ratio and the ester-aromatic ratio, QI in the raw material can be efficiently removed, it is ensured that the QI content of the obtained refined asphalt is not larger than 0.1%, the softening point is controlled to be 35-50 DEG C, the heating furnace outlet temperature, the coke tower top pressure, the recycle ratio and the total feeding time are accurately controlled, variable-temperature and variable-pressure operation is implemented, and the optimal mesophase development environment is constructed; the grinding, graphitization and electricity storage properties of the negative electrode coke are improved.

The invention discloses a preparation method of a high-performance bagasse hard carbon negative electrode material. According to the invention, bagasse is taken as a raw material, constant-temperature pickling treatment is carried out, carbonization conditions are accurately controlled, an oil bath auxiliary activator is adopted to activate the carbon material, carbon layer spacing is specifically enlarged, closed pores are constructed, and the structure and electrochemical performance of the hard carbon material are significantly improved. The solid activating agent is decomposed under the oil bath condition to generate a gas-phase oxidizing agent, hard carbon is mildly and uniformly etched and modified from the interior of particles, pores are created, meanwhile, a graphite microcrystalline structure beneficial to sodium storage is better reserved and optimized, and the first effect, the reversible specific capacity, the cycling stability and the platform capacity ratio of the hard carbon negative electrode material are improved.

The invention belongs to the field of batteries, and particularly discloses a battery positive electrode and a zinc-iodine battery containing the battery positive electrode. The battery positive electrode comprises a positive electrode material layer, and the positive electrode material layer contains a positive electrode material; the positive electrode material contains an active substance and a polar organic catalyst; the polar organic catalyst contains at least one group selected from hydroxyl, carboxyl, aldehyde group, ketone group, ester group, ether group, amino, amide group, nitryl, nitrile group, sulfonic acid group and quaternary ammonium salt. The polar organic catalyst is introduced into the battery positive electrode, the contained polar group can efficiently catalyze the iodine positive electrode four-electron conversion reaction, the reaction kinetics of the battery system is obviously accelerated, the iodine positive electrode capacity multiplication is realized, the complete conversion of I0 / I + can be realized, and the high-voltage platform capacity ratio reaches 50%; and the iodine positive electrode capacity, the rate capability and the self-discharge capacity retention rate of the zinc-iodine battery containing the battery positive electrode are remarkably improved.

The present invention relates to a lithium secondary battery, a battery module, and a battery pack. The lithium secondary battery comprises: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material; a separator disposed between the positive electrode and the negative electrode; and an electrolyte, wherein the positive electrode active material includes a lithium composite transition metal compound containing nickel (Ni), cobalt (Co), and manganese (Mn), the lithium composite transition metal compound contains single particles, the negative electrode active material includes a silicon oxide, and the grain size of Si in the silicon oxide is at most 10% of the grain size of the lithium composite transition metal compound.

The invention relates to a graphite paper-based zinc negative electrode and a preparation method and application thereof, and belongs to the technical field of novel battery energy storage. The preparation method of the graphite paper-based zinc negative electrode comprises the following steps: by taking graphite paper as a negative electrode, a zinc foil as a positive electrode and a zinc salt aqueous solution as an electrolyte, carrying out electro-deposition by applying constant current, so that zinc ions are subjected to reduction reaction on the surface of the graphite paper to form a zinc deposition layer, and the graphite paper-based zinc negative electrode is obtained. The graphite paper substrate and a hexagonal crystal system of zinc have good lattice matching performance, and zinc can be induced to preferentially deposit along the (002) crystal face. The Zn (002) crystal face has higher electrochemical stability and lower interface energy, and dendritic crystal growth and side reaction are effectively inhibited. Compared with a traditional copper foil substrate, the surface of a zinc deposition layer of the graphite paper substrate is uniform and compact, is rich in metallic luster and has no obvious dendritic crystal protrusions.

The invention belongs to the technical field of battery positive electrode materials, and particularly discloses an iodine positive electrode material and a preparation method and application thereof.According to the iodine positive electrode material, by means of the combined action of copper phthalocyanine and a carbon material, the stabilization effect on I < + > can be enhanced, and therefore the two-step oxidation-reduction reaction (I <->-I < 5 >-I < + >) is achieved. When the iodine positive electrode material is used as a positive electrode of a zinc ion battery, the iodine positive electrode material has relatively high specific capacity and energy density and excellent cycling stability and rate capability. In addition, the method for preparing the iodine positive electrode material is short in process, easy to operate and convenient for large-scale popularization and application, and has excellent social and economic potential.

The present invention relates to the synthesis of pure metal or multi-metal derivatives of ZIF-11, ZIF-12 or amorphous ZIF structures in high yield followed by calcination under inert conditions to produce in composite nanostructures one or more metal selenide dispersed on the surface of or embedded in a carbon matrix, and using these composites as electrodes for lithium ion batteries, sodium ion batteries, potassium ion batteries, supercapacitors or fuel cells.

This invention discloses a zinc-iodine battery and an electrode carrier that can simultaneously suppress polyiodine ion shuttle and regulate zinc deposition behavior, wherein the electrode carrier is Cu. + Coordinated poly(3,4-ethylenedioxythiophene) (Cu-PEDOT), via a solvothermal method, to convert Cu... + It was prepared by coordinating with S atoms in the PEDOT framework. I₂ was loaded onto this support as the positive electrode, and Zn was electrochemically deposited as the negative electrode to assemble a battery. The atomically monodisperse Cu in this invention... + It not only enhances the chemisorption of polyiodides as a Lewis active site, but also significantly reduces I... ‑ / I 0 Conversion energy barrier, accelerates reaction kinetics and suppresses shuttle effect; at the same time, Cu + The zinc-affinity property of the substrate reduces the Zn nucleation overpotential, guides Zn to deposit uniformly along the (002) crystal plane, and suppresses dendrites. Zinc-iodine batteries based on this substrate exhibit excellent rate performance and ultra-long cycle stability, and achieve dendrite-free negative electrode growth even under high depth-of-discharge conditions. This invention solves the problem of simultaneous multi-iodide shuttle in the positive electrode and zinc dendrite growth in the negative electrode using a single substrate, significantly improving the energy density and cycle life of the battery.

An electrode, a secondary battery including the same, and a method of manufacturing the electrode are disclosed. The electrode includes: an insulating layer having a through hole; a first metal layer on one surface of the insulating layer; a second metal layer on the other surface of the insulating layer; a first active material layer on the first metal layer; a second active material layer on the second metal layer; and a connection metal portion in the through hole and electrically connecting the first metal layer to the second metal layer.

The utility model relates to a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and a limiting component, the shell has an accommodating cavity. The electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a first pole piece, the first pole piece comprises a pole piece main body and a pole lug which are arranged along a first direction, at least part of the pole piece main body is provided with a first active material layer, and at least part of the pole lug is not provided with the first active material layer. The limiting component is arranged in the thickness direction of the battery monomer, at least part of the limiting component is arranged between the end part of the first active material layer along the first direction and the shell, and the thickness direction of the battery monomer is perpendicular to the first direction. According to the battery monomer provided by the invention, the limiting component can improve the defects of large gap difference and non-uniform distribution of each position along the first direction, so that the occurrence of an ion precipitation phenomenon is reduced, and the reliability of the battery monomer is improved.

The present invention provides a positive electrode active material comprising Ni and having a particle durability in the range of 20 to 60, the particle durability being defined as (C×S×102) / G, wherein C is an Li site occupancy percentage of Ni2+ (hereinafter, Ni2+ occupancy rate), S is a span value calculated using (D90-D10) / D50 according to particle-size distribution (PSD), and G is a grain size (㎛).

The utility model discloses a pole piece assembly and a battery, the pole piece assembly comprises a pole piece, the pole piece comprises an active material layer and a foil material, the foil material comprises an empty foil area and a coating area, the active material layer is connected with the coating area, and the empty foil area comprises a first surface and a second surface which are opposite to each other; the metal piece is welded and connected to the first surface; and the tab is welded and connected to the second surface. According to the pole piece assembly disclosed by the utility model, the tensile strength between the foil and the pole lug is relatively high.

The present disclosure relates to a positive electrode and a method of manufacturing the same. The positive electrode includes lithium manganese iron phosphate with an olivine structure as a positive electrode active material, which provides high structural stability. In addition, the lithium manganese iron phosphate can be easily controlled for particle size distribution by doping and / or substituting with one or more metals, therefore the positive electrode including the same has the advantages of excellent rolling density and energy density.

The application belongs to the field of rechargeable secondary batteries, and particularly relates to a water-based zinc ion battery capable of working in a wide temperature range, which is composed of a positive electrode, a negative electrode and an electrolyte. The positive electrode material is an n-type organic substance; the negative electrode is a metal zinc foil or a metal zinc powder; the electrolyte takes deionized water as a main solvent, takes inorganic lithium salt or inorganic sodium salt and a small amount of organic zinc salt as solutes, has the characteristics of high boiling point and low freezing point, and shows good ion conductivity in a relatively wide temperature range (-40 DEG C to 100 DEG C). Different from traditional zinc ion batteries, the zinc ion battery proposed in the application can stably work in the temperature range of -40 DEG C to 100 DEG C, shows good rate performance and cycle stability, and can be used for large-scale energy storage devices in extreme environments such as military and aerospace.

To provide a polyolefin film having high conductivity and maintaining good conductivity even after stretching, and to provide a resin current collector for a bipolar type battery having uniform conductivity in the thickness direction in a film surface.SOLUTION: The polyolefin film contains conductive particles and satisfies the following (1) and (2): (1) A carbon material and / or metal particles are contained in a total amount of 1.0 mass% or more and 40 mass% or less. (2) The conductive particles contain at least particles having an aspect ratio of 1 or more and less than 5 and particles having an aspect ratio of 5 or more.SELECTED DRAWING: None