391results about "Alkaline accumulators" patented technology

The invention provides a nitrogen-containing branched polymer, anion exchange resin, an anion exchange membrane and an electrochemical device. The molecular structure of the nitrogen-containing branched polymer comprises a nitrogen-containing heterocyclic ring, branched structures and biphenyl, the number of branching points of each branched structure is not less than 3, and the biphenyl is connected with the branching points of the branched structures through the nitrogen-containing heterocyclic ring; a represents the molar ratio of biphenyl in the nitrogen-containing branched polymer, B represents the molar ratio of a branched structure in the nitrogen-containing branched polymer, and A: B = (80-99): (1-20); the polydispersity index PDI of the nitrogen-containing branched polymer is less than or equal to 2.6, and the weight-average molecular weight of the nitrogen-containing branched polymer is 40000 g / mol to 50000 g / mol. The nitrogen-containing branched polymer provided by the invention can have excellent ionic conductivity and mechanical properties on the premise of reaching a low-level water absorption swelling rate.

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 negative electrode materials, and discloses a biomass derived carbon material as well as a preparation method and application thereof. The surface of the biomass derived carbon material is loaded with nano-clusters or nano-particles of a metal simple substance or a metal compound. The preparation method comprises the following steps: mixing a biomass precursor and a metal salt, and carrying out one-step pyrolysis to obtain the biomass derived carbon material. The biomass derived carbon material can be used as an alkali metal ion battery negative electrode material. Through the unique technical means of loading the metal simple substance / metal compound with the nano-cluster or nano-particle form on the surface of the biomass charcoal, the fast charging performance of the negative electrode material is practically and effectively improved. The battery prepared from the negative electrode material shows excellent comprehensive performance, and has excellent key performance indexes such as charge-discharge efficiency, cycle stability and energy density.

The invention discloses a preparation method of a cement-based structured electrolyte with high ion conductivity and the electrolyte, and the preparation method comprises the following steps: mixing a polymer solution, cement and fine sand to obtain a polymer-cement paste; and performing low-temperature closed maintenance on the polymer-cement paste, and standing at room temperature to obtain the cement-based structured electrolyte. The controlled phase separation technology is adopted, elastic phase separation of a polymer network is carried out earlier than cement hydration, cement becomes a framework of the polymer network in a self-adaptive mode in the hydration process, the interface of the polymer network and the cement is good, and a continuous high-conduction ion channel can be formed; and the preparation process is simple to operate and high in repeatability.

Described herein are thermoelectrochemical cells which have high Seebeck coefficients, as well as various implementations for said thermoelectrochemical cells. For instance, in some embodiments, the presently described thermoelectrochemical cell may be used to convert low grade heat into electrical energy. In some embodiments, the output electrical energy may have an oscillatory nature. The magnitude of the output energy and the characteristics of the oscillations may be tuned by adjusting electrode pore sizes, thermoelectrochemical cell temperature gradient and the material of at least one of the electrode, electrolyte and separator.

The present invention discloses a method for preparing a high-ionic conductivity cement-based structured electrolyte and the electrolyte, comprising: mixing a polymer solution, cement, and fine sand to obtain a polymer-cement slurry; subjecting the polymer-cement slurry to low-temperature, sealed curing, and then allowing it to stand at room temperature to obtain a cement-based structured electrolyte. The present invention utilizes a controlled phase separation technique to enable elastic phase separation of the polymer network prior to cement hydration. During the hydration process, the cement adaptively forms the backbone of the polymer network, resulting in a good interface between the two, capable of forming continuous, high-conductivity ion channels. The preparation process is simple to operate and highly reproducible.

Provided is a novel composition, in particular, a composition comprising an inorganic-organic hybrid compound. The composition comprises an inorganic-organic hybrid compound and a hydrophobic resin, wherein the inorganic-organic hybrid compound comprises a polyvinyl alcohol-based resin to which a metal oxide is chemically bonded.

To provide a secondary battery excellent in cycle life performance, a battery pack including the secondary battery, a vehicle, and a stationary power supply.SOLUTION: According to one embodiment, there is provided a secondary battery including an electrolyte containing water and a lithium salt, a positive electrode 5, and a negative electrode 3. The positive electrode 5 includes: a positive electrode active material-containing layer 5b; a positive electrode current collector 5a that supports the positive electrode active material-containing layer 5b, and that contains at least one of aluminum or an aluminum alloy; and a nitrogen-containing substance that presents at least a part of a surface of the positive electrode current collector 5a.SELECTED DRAWING: Figure 4

An aqueous electrolyte solution for a proton battery of the present disclosure contains water and pyrophosphoric acid (H4P2O7) dissolved in water at a concentration of 6 mol or more per kilogram of water, and does not have a freezing point at −60° C. or higher. The proton battery of the present disclosure includes the aqueous electrolyte solution of the present disclosure. The proton battery of the present disclosure includes the aqueous electrolyte solution of the present disclosure.

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

A surface-treated steel sheet including: a steel sheet; and a nickel-cobalt-iron diffusion layer formed on the steel sheet as an outermost layer. When the intensities for Ni, Co and Fe are consecutively measured from a surface of the nickel-cobalt-iron diffusion layer in the depth direction by radio frequency glow discharge optical emission spectrometry, and the concentration of Ni, Co and Fe at each of depth positions are determined based on the intensities for Ni, Co, and Fe, a Co concentration gradient ΔPCo ranging from a depth position DCo_MAX to a depth position DCo_15% is 33% by mass / 0.1 μm or less. A depth position at which the concentration of Co is maximum is defined as DCo_MAX and a depth position located closer to the steel sheet than the depth position DCo_MAX and at which the concentration of Co is 15% of the maximum value is defined as DCo_15%.

The present disclosure relates to a composite electrode comprising polymer with carbon particles percolated by gallium or a gallium-indium alloy, and a stretchable battery comprising: a cathode electrode comprising silver oxide and styrene-isoprene block copolymer (Ag2O-SIS) and a cathode current collector; an anode electrode comprising a gallium, carbon, and a polymer and an anode current collector; wherein each of the cathode current collector and the anode current collector comprise: a first current collector of a composite comprising liquid metal eutectic gallium-indium (EGaln), silver (Ag), and styrene-isoprene block copolymer (SIS); and a second current collector a second layer of carbon black (CB) and styrene-isoprene block copolymer (SIS). The disclosure also discloses a method to obtain said composite electrode and said stretchable battery.

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).

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 invention provides a preparation method of a cobalt-based intermetallic carbide material and application of the cobalt-based intermetallic carbide material in a preparation method of an electrocatalytic nitrate reduction electrolytic tank or a zinc-nitrate battery. The preparation method of the cobalt-based intermetallic carbide material comprises the following steps that cobalt chloride hexahydrate, indium chloride tetrahydrate, dicyandiamide and ketjen black are ground and mixed and then put into a tubular furnace for thermal annealing reduction, and the cobalt-based intermetallic carbide material is obtained. According to the method, cobalt-based intermetallic carbide material Co3InC0.75 powder is prepared into slurry, the slurry is dropped on carbon paper to be used for an electro-catalysis reaction, the material strengthens nitrate adsorption and water decomposition and inhibits a hydrogen evolution reaction, and therefore the performance of electro-catalysis of nitrate reduction to produce ammonia is improved.

The present invention discloses a diazine-based organic negative electrode material for aqueous alkaline batteries and its application, relating to the field of battery technology. This type of organic negative electrode has an electrochemical redox active center with a nitrogen-nitrogen double bond (N=N), including but not limited to azobenzene; azobenzene modified with at least one of halogen, methyl, and nitro functional groups; benzo[c]cinnoline; and benzo[c]cinnoline modified with at least one of halogen, methyl, and nitro functional groups. The organic negative electrode material provided by the present invention can operate stably under various alkaline conditions and is compatible with nickel hydroxide positive electrodes and air positive electrodes. The material has excellent rate performance and long-term cycle stability, and its wide source makes it suitable for large-scale application.

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.

The application discloses a low-temperature-resistant electrolyte for alkaline batteries and a preparation method thereof, and relates to the technical field of electrolytes. The application comprises the following raw materials in mass fraction: glycerol triacetate 11-13 parts, potassium hydroxide aqueous solution 100-150 parts, fluorine-containing additive 1-5 parts, and organic dispersion 21.3-28 parts; the organic dispersion is prepared from ethylene glycol, tetrabutylammonium trifluoromethanesulfonate, hybrid nanosheet and glycerol triacetate. The hybrid nanosheet prepared from hexagonal boron nitride, cerium ammonium nitrate, urea and polyethylene glycol 400 effectively improves the ion conductivity and cycle stability maintenance rate of the electrolyte at low temperature. The introduction of the components such as glycerol triacetate and fluorine-containing additive in the application further improves the performance maintenance rate of the electrolyte at low temperature, and simultaneously reduces the viscosity of the electrolyte at low temperature. Therefore, the application has a more extensive application prospect.

To provide an alkaline electrochemical battery.SOLUTION: Alkaline electrochemical cells are provided, wherein dissolved zinc oxide or zinc hydroxide is included at least in the free electrolyte solution, and / or solid zinc oxide or zinc hydroxide is included in the anode, so as to slow formation of a zinc oxide passivation layer on a zinc electrode. Methods for preparing such cells are also provided.SELECTED DRAWING: Figure 1

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 invention provides a battery. A battery according to the present invention is provided with an exterior body and a power generation element housed in the exterior body, the power generation element comprising a positive electrode, a negative electrode, a separator, and an aqueous electrolyte solution, the negative electrode containing, as an active material layer, an electrolytic zinc foil comprising a zinc alloy containing Bi in a proportion of 0.001-0.644 mass%, the aqueous electrolyte solution is an aqueous electrolyte solution having a pH of 3 or more and less than 12 or an alkaline electrolyte solution having a pH of 12 or more.

Provided is an anode including a metal porous body having a foam structure, a lithium-philic film formed on a surface of the metal porous body, and lithium impregnated into pores of the metal porous body.

Disclosed is a novel active material operatable in an aqueous battery. The aqueous battery of the present disclosure includes a positive electrode, an aqueous electrolyte solution and a negative electrode. The positive electrode includes a positive electrode active material, and the negative electrode includes a negative electrode active material. One of or both the positive electrode active material and the negative electrode active material include(s) a composite oxide. The composite oxide contains Na, at least one transition metal element of Fe, Ti, Ni and Mn, and O. The aqueous electrolyte solution contains water and potassium polyphosphate dissolved in the water.

The invention discloses aquadag for an alkaline battery and application of the aquadag. The aquadag comprises the following raw materials in percentage by weight: 12-16% of graphite powder, 5-8% of conductive carbon black, 1-2% of graphene, 15-18% of epoxy resin, 30-50% of butanone and 10-20% of cyclohexanone. The preparation method of the aquadag comprises the following steps: (1) uniformly stirring butanone and cyclohexanone to obtain a composite solvent; (2) adding solid epoxy resin into the composite solvent, and stirring at 800-1000 rpm to completely dissolve the solid epoxy resin; (3) slowly adding graphite powder and conductive carbon black graphene into the composite solvent, and dispersing at a high speed of 1100-1200 rpm for 45-50 min to obtain a mixture; and (4) carrying out ball milling on the mixture, sieving with a 200-mesh sieve, and discharging to obtain the aquadag. The graphene is doped into the aquadag, so that the technical effect of improving the comprehensive performance of the battery is achieved.

A sealing assembly for a battery cell includes a grommet having an opening with an inner surface. A peg has a peg head and a shaft extending from the peg head. The shaft includes a first portion having a larger diameter and a second portion having a smaller diameter, and the shaft extends through the opening in the grommet. The shaft and the grommet form a first interference fit at a distal end of the opening. A trap gap is formed between the distal end of the opening and the peg head. The trap gap defines a trap for a sealant. A sealant is disposed on the shaft and at least partially in the trap.

Systems and methods of operating aluminum-air electrochemical cells are provided, in which, following operation of the electrochemical cell(s), the alkaline electrolyte is removed from the cell(s) and a mixture of water with oxygen-rich organic solvent(s) is introduced to protect the aluminum anodes from corrosion by the electrolyte residues. For example, the cell(s) may be flooded with the mixture and then drained, or the mixture may be circulated through the cell(s). During stand-by, the mixture may be used to flood or to be circulated through the cell(s) and drained, to further enhance the operability of cell(s) during operation.

Alkaline electrochemical cells are provided, wherein methods to decrease or eliminate shorting in batteries by preventing zinc oxide reaction precipitate from creating a conductive bridge between the two electrodes. The alkaline electrochemical cell comprising dissolved zinc oxide or zinc hydroxide in at least the electrolyte solution, and / or solid zinc oxide particles or zinc hydroxide in the anode, a silicon donor in the anode, and / or a bilayer separator optimally comprising a high-density layer and a low-density layer.

The invention discloses a low-temperature-resistant negative electrode zinc paste and a low-temperature alkaline zinc-manganese battery containing the zinc paste. The negative electrode zinc paste comprises the following components in parts by weight: 60-65 parts of zinc powder, 1-2 parts of a composite conductive agent, 0.1-0.3 part of a composite corrosion inhibitor and 35-38 parts of a low-temperature electrolyte; the low-temperature electrolyte comprises a multi-element nonionic surfactant system, a multi-element nano anti-freezing agent system and a mixed solution A, the 3.9 ohm discharge capacity of the battery under the condition of-40 DEG C is larger than or equal to 60% compared with the capacity retention rate at normal temperature, the interface impedance amplification is smaller than or equal to 15%, the hydrogen evolution amount is reduced by 80% on year-on-year basis, the process is compatible with an existing production line, and the battery is suitable for polar scientific investigation and electronic equipment in plateau and cold regions.

The present disclosure provides: an active material for a manganese oxide-zinc secondary battery, with which it is possible to achieve a manganese oxide-zinc secondary battery that is improved in terms of both the cycle characteristics and the utilization rate of an electrode active material in comparison to conventional active materials for a zinc secondary battery; and a method for producing the active material for a manganese oxide-zinc secondary battery. An electrode active material for a secondary battery according to the present disclosure is characterized by including a manganese oxide and a conductive assistant, and is also characterized in that the conductive assistant is present in at least a part of the manganese oxide surface, and the manganese / carbon area ratio of the conductive assistant is not less than 0.30 but less than 1.0.

Provided herein hybrid organic-inorganic redox active materials and related composites, compositions, electrode materials, electrodes electrochemical cells, batteries, methods and systems, which, can be used as to provide high performance cathode active materials in high capacity, high energy density, safe, and long-lasting electrochemical cells and batteries when coupled with Li, Na, K, graphite, lithiated graphite, in situ lithiated graphite, silicon, lithiated silicon, in situ lithiated silicon, silicon-graphite, in situ lithiated silicon-graphite, hard carbon, sodiated hard carbon, graphite-silicone, lithiated graphite-silicon etc. anodes in non-aqueous electrolytes.