624results about "Alkaline accumulator electrodes" patented technology

According to one aspect, an additive for an iron negative electrode of an alkaline electrochemical cell may comprise a powder of discrete particles comprising agglomerated particles comprising at least one metal sulfide.

The invention relates to the technical field of battery electrodes, in particular to a zinc pole piece coated with a sulfonic COF membrane, a preparation method of the zinc pole piece and an aqueous zinc battery, and the preparation method comprises the following steps: dissolving 2, 4, 6-triformyl phloroglucinol and p-phenylenediamine-2, 5-disulfonic acid in an organic solvent to obtain a mixed solution; and putting the zinc foil into the mixed solution, carrying out sealed standing at normal temperature, taking out the zinc foil coated with the sulfonic group COF film, and washing and drying the zinc foil to obtain the zinc pole piece coated with the sulfonic group COF film. The prepared zinc pole piece coated with the sulfonic COF film has good corrosion resistance and dendritic crystal inhibition capacity, and when the zinc pole piece is used as a negative electrode of a water-based zinc battery, the cycle performance of the water-based zinc battery can be improved, and the cycle life of the water-based zinc battery can be prolonged; the problems that a zinc negative electrode of an existing water-based zinc battery is prone to generating dendritic crystal and corrosion passivation side reactions in the battery circulation process, so that the use performance of the water-based zinc battery is reduced, and the service life is greatly shortened are solved.

The invention relates to an iron-nickel battery negative electrode material and a preparation method thereof. The negative electrode material of the iron-nickel battery comprises the following components in parts by weight: 80-95 parts of an iron-based active substance, 3-15 parts of a conductive enhancer, 2-5 parts of a binder and 0.1-5 parts of sulfide, wherein the iron-based active substance comprises nanoscale iron powder or micron-sized porous iron particles; the conductive reinforcing agent comprises graphene or carbon nanotubes. The preparation method comprises the following steps: S1, carrying out ball-milling mixing on an iron-based active substance and sulfide, and carrying out heat treatment in an inert atmosphere to obtain a surface-vulcanized iron-based compound; s2, dispersing the surface-vulcanized iron-based compound and a conductive reinforcing agent in a solvent, and performing spray drying to obtain core-shell particles; and S3, mixing the core-shell structure particles with a binder, coating a metal foil current collector with the mixture, and performing drying, rolling and cutting to obtain the electrode plate containing the iron-nickel battery negative electrode material. The problems of pulverization, passivation and the like of a traditional iron negative electrode are solved, and meanwhile, the cost is low and the stability is high.

The invention belongs to the technical field of electrochemical batteries, and discloses a hydrophobic-zinc-philic interface protection layer of a high-rate zinc metal negative electrode and preparation and application of the hydrophobic-zinc-philic interface protection layer. The preparation method comprises the following steps: dissolving a polyvinyl alcohol derivative in a polar solvent, uniformly distributing a precursor on the surface of zinc metal through a gradient spin-coating process (including a low-speed pre-coating process and a high-speed spin-coating process), and inducing phase separation by using a specific saturated salt solution. And finally preparing the hydrophobic-zinc-loving interface protection layer of the high-magnification zinc metal negative electrode. According to the hydrophobic-zinc-philic interface protection layer, a hydrophobic long chain is used for inhibiting water-related side reactions, rapid transmission of zinc ions is promoted through a zinc-philic functional group, and then the zinc metal negative electrode and the zinc battery which have excellent rate capability (40mA cm <-2 >) and long cycle stability (2000h) at the same time are achieved. In addition, the preparation process is mild in reaction conditions and simplified in operation steps, has large-scale production potential and has remarkable industrial application prospects.

This invention discloses a positive electrode material and its preparation method, as well as a lithium-ion battery, relating to the field of lithium-ion battery electrode materials. The preparation method of the positive electrode material includes: (1) mixing positive electrode raw materials, binder, and dispersant uniformly in a weight ratio of 10:(0.2-2):(10-50) to obtain a slurry; (2) spray-drying the slurry to obtain a powder; and (3) sintering the powder using a fluidized bed. The binder is selected from one or more of starch, PVP, PEG, PVA, and PAN, and the dispersant is selected from one or more of ethanol, isopropanol, and water. Implementing this invention can reduce the sintering temperature of the positive electrode material, shorten its sintering reaction time, and improve its sintering quality. Specifically, the sintering time of the positive electrode material of this invention can be shortened to 2-60 min.

To provide a wound electrode body that can improve heat dissipation on the inside of the winding. [Solution] The wound electrode body 10 is a wound electrode body 10 in which a first electrode 11A and a second electrode 11B having a different polarity from the first electrode 11A are wound in a flat shape via a separator 12. In the wound electrode body 10, the first electrode 11A includes a resin substrate, a conductive layer provided on the surface of the resin substrate, and a first active material layer 200A provided on the main surface of the conductive layer located on the side opposite to the side where the resin substrate is located relative to the conductive layer. The portion of the resin substrate located on the inside of the wound electrode body 10 has higher heat dissipation than the portion located on the outside of the wound electrode body 10.

The embodiment of the invention discloses a secondary battery and electric equipment, the secondary battery comprises an electrode assembly, the electrode assembly comprises a plurality of first pole pieces and a plurality of second pole pieces, and the secondary battery comprises a first coating; the first coating comprises a plurality of first coating blocks, the plurality of first coating blocks are arranged on the surface, facing the second pole piece, of the first pole piece, a first channel is formed between any two adjacent first coating blocks, the first channel is at least communicated with one edge of the first pole piece, and the first channel exposes at least part of the surface, facing the second pole piece, of the first pole piece; the first coating is melted when the temperature is higher than a first preset temperature and at least partially covers the first channel, the area of the first pole piece covered by the first coating after melting is X1, the area of the first pole piece covered by the first coating before melting is Y1, and X1 is larger than Y1. According to the embodiment of the invention, the area of the first coating after melting is increased, so that heat generated by continuous contact reaction between the active particles of the first pole piece and the electrolyte can be slowed down, and the probability of thermal runaway of the secondary battery is reduced.

The invention provides a zinc negative electrode material, a zinc negative electrode and a nickel-zinc battery in order to solve the problem that an oxidation film generated by a negative electrode of a nickel-zinc battery in the prior art hinders electron conduction and influences electrochemical performance. The zinc negative electrode material comprises a negative electrode active material, the negative electrode active material comprises a zinc composite material, the zinc composite material has a core-shell structure, the core-shell structure comprises an inner core, a middle layer and a shell layer, the inner core is zinc powder, the middle layer coats the inner core, and the shell layer coats the middle layer. According to the zinc negative electrode material provided by the invention, the surface of the inner core zinc powder is coated with the middle layer, so that the effect of protecting the zinc powder is achieved, corrosion to the zinc powder is slowed down, and the basic performance of the zinc powder is maintained; besides, the surface of the middle layer is coated with the shell layer, the property of the surface of the zinc powder can be changed, meanwhile, the shell layer can cover hydrogen evolution reaction active sites on the surface of the middle layer, the shell layer can adjust the reduction potential of the zinc powder, the overall hydrogen evolution overpotential on the surface of the zinc powder is increased, the hydrogen evolution side reaction is reduced, and the stability of the electrochemical performance of the battery is guaranteed.

The application discloses sulfonated silk protein gel as an interface modification layer of a water-based zinc electrode and a preparation method thereof, and belongs to the technical field of negative electrode materials of zinc ion batteries. The sulfonated silk protein gel is prepared by using natural silk, raw materials are widely sourced, and the sulfonated silk protein gel is green and environment-friendly. The prepared sulfonated silk protein gel contains rich functional groups (‑OH, ‑NH‑, ‑C=O, ‑SO3H and the like), can cover the entire zinc electrode surface, forms a gel-like transition zone at the interface, and provides basic protection for the zinc electrode. In addition, the gel layer optimizes the electric field, improves the interface compatibility, can guarantee uniformity in the nucleation and growth process, plays an obvious role in controlling the dendrite growth, effectively prolongs the service life of the zinc ion battery, and improves the cycle stability of the zinc ion battery.

To provide a technology that can suppress the elution of Al from a current collector into an aqueous electrolyte when an Al-containing current collector is used in a non-aqueous battery.SOLUTION: A non-aqueous battery includes a positive electrode, an aqueous electrolyte, and a negative electrode. One or both of the positive electrode and the negative electrode have a current collector containing Al. The current collector is in contact with the aqueous electrolyte. The aqueous electrolyte contains water and potassium polyphosphate dissolved in the water. At least one of protons, hydroxide ions, and polyphosphate ions contained in the aqueous electrolyte acts as carrier ions, and the aqueous electrolyte does not have a freezing point at a temperature of -40°C or higher.SELECTED DRAWING: Figure 1

The invention discloses preparation of a C3N5 / MXene composite material and application of the C3N5 / MXene composite material in an aqueous zinc ion battery, and the preparation method of the C3N5 / MXene composite material comprises the following steps: taking 3-amino-1, 2, 4-triazole as a raw material, calcining, carrying out a hydrothermal reaction, washing and drying to obtain C3N5 powder; the preparation method comprises the following steps: adding lithium fluoride into hydrochloric acid, uniformly stirring, adding Ti3AlC2, continuously stirring, etching, centrifuging, washing, adding deionized water again, carrying out ultrasonic treatment under protective gas, centrifuging, and collecting supernate to obtain a single-few-layer MXene dispersion liquid; the preparation method comprises the following steps: adding C3N5 powder into deionized water, uniformly dispersing to obtain a C3N5 dispersion liquid, then adding a single-few-layer MXene dispersion liquid into the C3N5 dispersion liquid, and after the reaction is completed, centrifugally collecting precipitate and drying to obtain the C3N5 / MXene composite material. When the C3N5 / MXene composite material prepared by the method is used as a negative electrode of an aqueous zinc ion battery, the problems of dendritic crystal growth, hydrogen evolution reaction and the like of a traditional zinc negative electrode can be solved, and the electrochemical performance of the battery is remarkably improved.

There is provided an aqueous coating liquid having excellent storage stability and capable of forming a coating film with excellent water resistance. The aqueous coating liquid is an aqueous coating liquid for forming a coating film to be provided between a collector and an active material layer in an electrode for an electricity storage apparatus. This aqueous coating liquid contains: a water-based medium containing water; at least one polyvinyl alcohol (PVA)-based resin selected from the group consisting of unmodified polyvinyl alcohols and modified polyvinyl alcohols; an electrically conductive material; and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC). In addition, the aqueous coating liquid satisfies a condition that the aqueous coating liquid is free of polyacrylic acid, or that even when the aqueous coating liquid contains polyacrylic acid, the content of polyacrylic acid is less than 9′% by mass based on the total mass of the aqueous coating liquid. Further, the ratio of the content of the PVA-based resin in the aqueous coating liquid to the content of PBTC in the aqueous coating liquid is 2 to 100.

Generally described herein are multiphase electroactive materials and associated articles (e.g., electrodes), systems (e.g., electrochemical devices), and methods. In certain embodiments, an electroactive material comprises a first component and a second component that is softer than the first component. The first component and the second component may be intermixed such that the second component is dispersed throughout a bulk of the first component. In some embodiments, the first component comprises a first alkali metal (e.g., metallic lithium) and the second component comprises a second alkali metal (e.g., metallic sodium) and a third alkali metal (e.g., metallic potassium).

In order to solve the problems that in the prior art, a zinc negative electrode is prone to corrosion and zinc dendrite growth in the charging and discharging process, the zinc negative electrode comprises a negative electrode base material, a negative electrode active layer and a composite coating, the composite coating comprises a first coating and a second coating, the negative electrode active layer is arranged on the surface of the negative electrode base material, and the second coating is arranged on the surface of the negative electrode base material. The second coating is arranged on one surface, deviating from the negative substrate, of the negative active layer; the first coating is arranged on one surface, deviating from the negative active layer, of the second coating; the first coating comprises a first material, the second coating comprises a second material, the first material comprises an amide polymer and / or an amide non-polymer, and the second material comprises one or more of an ionic liquid material, a zinc phosphate material and a cerium oxide material. The surface of the zinc negative electrode is coated with the composite coating, so that multiple protection on the zinc negative electrode is formed, contact between zinc and electrolyte is effectively reduced, corrosion reaction and zinc dendrite growth are inhibited, and the cycle performance and safety of the nickel-zinc battery are improved.

The present invention relates to a zinc negative electrode with a stress-responsive interface modification layer, a preparation method thereof, and a zinc-ion battery, belonging to the technical field of zinc negative electrode interface modification for aqueous zinc-ion batteries. The thickness of the interface modification layer is 0.1 μm to 20 μm, and it is uniformly distributed on the surface of the zinc negative electrode; the material of the interface modification layer is polyborosiloxane with shear thickening characteristics. The interface modification layer has good conductivity and stress response characteristics, can effectively inhibit the growth of zinc dendrites, optimizes the zinc ion deposition behavior at the interface of the metal zinc negative electrode, and helps to improve the cycle stability of the aqueous zinc-ion battery; the present invention also provides a preparation method of a zinc negative electrode with a stress-responsive interface modification layer, which uniformly forms a stress-responsive interface modification layer on the surface of the metal zinc negative electrode by a solvent evaporation method to protect the metal zinc negative electrode and effectively inhibit the growth of zinc dendrites; the aqueous zinc-ion battery is a button battery or a soft-pack battery.

A process for fabricating an electrode involves forming a solid layer of an electrode material on a surface of a solid current collector by compression molding. The electrode material contains a mixture of an electrically conductive graphite and a binder, the binder being a moldable polymer. A layer of an electrically insulating material is formed, for example by molding, on a surface of the layer of the electrode material so that a portion of the surface of the layer of the electrode material remains uncovered by the insulating material. An electrode fabricated by the process is preferably a charge cathode for an electrochemical cell.

The utility model relates to the technical field of batteries, in particular to a nickel-metal hydride battery positive pole piece and a battery. The positive pole piece of the nickel-metal hydride battery comprises a base material, an active material area and a net position buffer area located on one side of the active material area are formed on the base material, a tab belt is welded to the net position buffer area, an insulating layer is pasted to the tab belt, the insulating layer at least covers part of the inner side edge of the tab belt in the width direction, and the outer side edge of the tab belt is provided with a gap between the active material area and the net position buffer area. And at least part of the net bit buffer area is covered. By adopting the mode, the stability of the battery can be improved.

The invention relates to the technical field of battery positive electrode materials, and discloses a secondary zinc-manganese battery positive electrode material, a preparation method and a secondary zinc-manganese battery, the secondary zinc-manganese battery positive electrode material comprises manganese dioxide, graphite, calcium stearate, polypyrrole and a niobium pentoxide nanometer material, the polypyrrole is coated on the surface of the manganese dioxide in an in-situ polymerization mode, and the niobium pentoxide nano material is integrated in the polypyrrole coated manganese dioxide composite material in an in-situ growth mode. According to the secondary zinc-manganese battery positive electrode material provided by the invention, a stable conductive network and an ion channel are constructed by adopting a manganese dioxide / polypyrrole / niobium pentoxide composite material, so that the conductivity and the structural stability of the positive electrode material at a low temperature are remarkably improved.

To provide an electrochemically active cathode material for a battery.SOLUTION: An electrochemically active cathode material includes a non-stoichiometric beta-delithiated layered nickel oxide. The non-stoichiometric beta-delithiated layered nickel oxide has a chemical formula. The chemical formula is LixAyNi1+a-zMzO2*nH2O. In the formula, x is approximately 0.02 to 0.20, y is approximately 0.03 to 0.20, a is approximately 0.02 to 0.2, z is approximately 0 to 0.2, and n is approximately 0 to 1. In the chemical formula, A is an alkali metal. The alkali metal includes potassium, rubidium, cesium, and any combination thereof. In the chemical formula, M comprises an alkaline earth metal, a transition metal, a non-transition metal, and any combination thereof.SELECTED DRAWING: Figure 1

The rechargeable battery cell can include an electrode having a plurality of three-dimensional channels defined therethrough, at least 90% of the three-dimensional channels having pores between 50 nanometers and 400 microns in size. An ion exchange material can be disposed to define an interface with at least a portion of the electrode. In some embodiments, the electrode includes a zinc (Zn)-containing anode and a cathode including at least one of nickel hydroxide (Ni(OH)2), nickel oxyhydroxide (NiOOH), manganese dioxide (MnO2), copper oxide, and bismuth oxide.

The purpose of the present invention is to provide a battery module with which it is possible to pressurize a battery with a simple structure. This battery module comprises: a module housing; a battery assembly that is housed in the module housing in a vertical direction and is composed of a plurality of secondary batteries having a vertically long shape and being juxtaposed in parallel to each other; a pair of end plates that are provided on both sides of the battery assembly and face each other in the direction in which the plurality of secondary batteries are juxtaposed; and a plurality of rods that are provided perpendicular to the pair of end plates and connect the pair of end plates. Each of the rods has an extension part that extends passing through at least one end plate, and an energization means that biases at least one end plate toward the other end plate is provided in each extension part of the rod.

To provide a hydrogen storage alloy negative electrode that improves cycle life characteristics and low-temperature charge characteristics.SOLUTION: A hydrogen storage alloy negative electrode includes a hydrogen storage alloy and yttrium fluoride as an additive. The mass of yttrium fluoride is 0.1 mass part or more and 0.2 mass part or less per 100 mass parts of hydrogen storage alloy powder.SELECTED DRAWING: Figure 1

The present invention provides an alkaline button cell that has excellent load characteristics and high reliability.　An alkaline button cell which is obtained by having a positive electrode that has a positive electrode mixture layer containing silver oxide and a conductive assistant, a negative electrode that contains zinc particles, and an alkaline electrolyte solution contained in a battery container that is composed of an outer package can, a cover plate and a resin gasket, wherein: carbon black and graphite particles are contained as the conductive assistant in the positive electrode mixture layer; and the water content in the battery container is set to 0.63-1 g per 1 g of the zinc particles in the negative electrode.

According to one aspect, an additive for an iron negative electrode of an alkaline electrochemical cell may include a powder of discrete granules including agglomerated particles, the agglomerated particles including at least one metal sulfide.

The present invention provides: a hydrogen storage alloy which is suitable for a negative electrode of an in-vehicle alkaline storage battery; an alkaline storage battery which uses this hydrogen storage alloy; and a vehicle. The present invention provides: a hydrogen storage alloy for alkaline storage batteries, the hydrogen storage alloy being used for an alkaline storage battery and having an A2B7 type crystal structure, an A5B19 type crystal structure or a AB3 type crystal structure as a main phase in combination, while being represented by general formula (1) (La1-a-bYaRb)1-cMgcNidAleCrfFeg (wherein R represents one or both of Sm and Ce; and indexes a, b, c, d, e, f and g represent numbers that satisfy 0 < a ≤ 0.12, 0 ≤ b ≤ 0.12, 0.13 ≤ c ≤ 0.27, 3.20 ≤ d + e + f + g ≤ 3.75, 0 ≤ e ≤ 0.14, 0 ≤ f ≤ 0.05 and 0 ≤ g ≤ 0.35); an alkaline storage battery which uses this hydrogen storage alloy for alkaline storage batteries in a negative electrode; and a vehicle which comprises this alkaline storage battery as a power supply for a motor.

The invention belongs to the technical field of zinc ion batteries, and particularly relates to a zinc metal negative electrode and a zinc ion battery. The zinc metal negative electrode comprises a zinc metal substrate and a coating covering the surface of the zinc metal substrate, the coating comprises a conductive metal oxide; the coating is formed on the zinc metal substrate in a manner independent of an organic polymer binder. According to the scheme, the use of an insulating organic polymer adhesive is avoided, so that the conductivity of the coating is improved, and the structural controllability of the coating is improved. The high-conductivity indium tin oxide (ITO) nanorod is prepared through cooperation of microwave solvothermal synthesis and high-temperature calcination, and a protective layer which is free of a binder and controllable in structure is constructed on the surface of the zinc foil through the electrophoretic deposition technology.

The invention discloses an L-cysteine doped ammonium vanadate positive electrode material, a preparation method thereof and application of the L-cysteine doped ammonium vanadate positive electrode material in an aqueous zinc ion battery, and belongs to the technical field of materials. The preparation method comprises the following steps: adding ammonium metavanadate and oxalic acid into deionized water, stirring and mixing, then adding L-cysteine, carrying out hydrothermal reaction on the obtained mixed solution, cooling to room temperature, carrying out centrifugal cleaning, and carrying out vacuum drying to obtain the L-NVO. L-NVO is prepared through a simple one-step hydrothermal method, L-cysteine is doped into the electrode material through further reaction, the introduction of L-cysteine not only enlarges the interlayer spacing of NVO, but also participates in the storage of zinc ions, increases the active sites of the zinc ions, effectively promotes the diffusion of ions and charge transfer, and improves the electrochemical performance of the electrode material. The conductivity of the material is improved, the internal resistance of the material is reduced, and the structural flexibility and stability of the material are maintained, so that the overall performance of the aqueous zinc ion battery is improved.

The present invention belongs to the field of alkaline zinc-nickel secondary batteries and discloses a positive electrode for zinc-nickel secondary batteries, its preparation method, and application. The positive electrode is prepared from a slurry containing water, an active substance, zinc powder, a metal compound additive, a highly conductive activated carbon material, a positive electrode additive, and a binder mixed in a certain proportion, and nickel foam. The slurry is coated using a slurry pulling method. This preparation method is simple, efficient, and highly flexible, making it conducive to large-scale production. Furthermore, the highly conductive cobalt oxide and the highly conductive activated carbon material in the zinc-nickel battery positive electrode formula provided by the present invention form an excellent conductive network, effectively increasing battery capacity and improving the stability of the positive electrode.

The invention relates to the technical field of alkaline batteries, in particular to a high-humidity-resistant and anti-corrosion alkaline battery positive electrode composite conductive material and a preparation method thereof. The positive electrode composite conductive material comprises 50-70 parts of modified carbon nanotubes, 20-30 parts of crystalline flake graphite, 5-15 parts of molybdenum-doped SnO, 3-8 parts of a binder and 0.5-2 parts of conductive carbon black. The material is particularly suitable for high-humidity and strong-alkali environments (such as ocean equipment batteries and tropical region energy storage systems), has long service life and high output efficiency, and overcomes the defects that a traditional conductive material is easy to corrode and rapid in conductivity attenuation. The preparation method disclosed by the invention is simple and convenient to operate and clear in flow, does not need complex equipment and special process conditions, reduces the production cost and the production difficulty, is easy to realize industrial production, and is beneficial to popularization and application of the technology.

To ensure easy permeation of an electrolyte solution into an electrode plate during the injection of the electrolyte solution.SOLUTION: A positive electrode plate 2 is configured so that: when a coating side surface 22a of a positive electrode mixture layer filling a positive electrode current collector 21 is divided into a plurality of regions including an upper region Wt1 and a lower region Wt3 in an up-down direction and, at an end part 22d of the positive electrode mixture layer, an average uneven width of the end part 22d of the positive electrode mixture layer in the upper region Wt1 is defined as an uneven width ΔW1 and an average uneven width of the end part 22d of the positive electrode mixture layer in the lower region Wt3 is defined as an uneven width ΔW3, uneven width ΔW1≤uneven width ΔW3 is satisfied. At the injection of the electrolyte solution, the electrolyte solution remaining at the bottom of an electrode group easily permeates from the end part 22d of the lower region Wt3.SELECTED DRAWING: Figure 7