84results about "Alkaline electrolytes" patented technology

The disclosure relates to an aqueous electrochemical device comprising a negative electrode, a positive electrode, a separator and an aqueous electrolyte having an alkaline pH, wherein onto the positive electrode is disposed at least one layer of nanoparticles capable of being used to form a local hydronium ion rich environment at the positive electrode during operation of the device, and / or the capacity ratio between the negative electrode and the positive electrode is less than 1 so as to substantially avoid production of oxygen at the positive electrode. The electrochemical device may find particular use in large-scale energy storage.

We provide long-term and ultra-long-term (overall, ≥8 hours) energy storage systems. [Solution] Various embodiments may include a battery comprising a first electrode, an electrolyte, and a second electrode ionically conductively connected to the first electrode via the electrolyte. The first electrode comprises direct reduced iron ("DRI") pellets and a conductive material. The conductive material may be scattered between individual DRI pellets. The conductive material has a higher electrical conductivity than the DRI pellets.

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 an all-alkaline manganese-based open-circuit flow battery and a construction method thereof. In the flow battery, a charging negative electrode catalyst is used as a charging negative electrode, and the charging negative electrode catalyst and a nitrate-containing charging negative electrode electrolyte form a charging negative electrode module; the discharge negative electrode catalyst is used as a discharge negative electrode, and forms a discharge negative electrode module with the ethylene glycol-containing discharge negative electrode electrolyte; using an inert catalyst as an inert positive electrode, and forming a positive electrode module with the positive electrode electrolyte containing the alkaline redox ion pair; the positive electrode module is arranged between the charging negative electrode module and the discharging negative electrode module, and the diaphragms are arranged between the adjacent modules. The additive is low in cost, high in safety, stable and long-acting, and the manganese element is used as an active substance, so that the cost is greatly reduced; the alkaline electrolyte is safer than the acidic electrolyte, so that the problem of equipment corrosion is reduced; the alkaline positive electrode electrolyte is coupled with the organic matter oxidation reaction, so that the loss caused by acid-base neutralization is avoided, and the stability of the open-circuit flow battery is effectively improved.

To provide long and ultra-long duration energy storage systems.SOLUTION: There are provided a battery, a bulk energy storage system including the battery, and / or a method of operating the bulk energy storage system including the battery. The battery may include a first electrode, an electrolyte, and a second electrode, wherein one or both of the first electrode and the second electrode comprise direct reduced iron ("DRI"). The DRI may be in the form of pellets. The pellets may comprise at least about 60 wt.% iron by elemental mass, based on the total mass of the pellets. One or both of the first electrode and the second electrode comprises from about 60% to about 90% iron and from about 1% to about 40% of a component comprising one or more of materials selected from a group of SiO2, AI2O3, MgO, CaO, and TiO2.SELECTED DRAWING: Figure 1

Embodiments of the present disclosure disclose a low-cost alkaline secondary battery positive electrode material and a preparation method and application thereof, which belongs to the technical field of alkaline secondary battery. The positive electrode material includes a composite positive electrode material including manganese dioxide and partially oxidized layered hydroxide, etc. The composite positive electrode material prepared by the embodiments of the present disclosure has the advantage of a high discharge platform, or the like, with respect to a conventional manganese electrode, which significantly improves the cycling stability and reversibility of the zinc-manganese alkaline secondary battery.

An alkaline storage battery includes a positive electrode. The positive electrode includes a positive electrode mixture. The positive electrode mixture contains a nickel compound and a metal compound. The nickel compound is a positive electrode active material The metal compound is a compound of at least one metal element selected from the group consisting of titanium, niobium, tungsten, vanadium, molybdenum, zirconium, and tantalum. A ratio Wm / Wn of a mass Wm of the metal compound contained in the positive electrode mixture to a mass Wn of the nickel compound contained in the positive electrode mixture in terms of nickel hydroxide ranges from 0.2 / 100 to 5.0 / 100. The metal compound contains iron at a mass ratio ranging from 10 ppm to 10000 ppm. A ratio We / Wp of a mass We of the alkaline electrolyte to a mass Wp of the positive electrode mixture ranges from 0.35 to 1.0.

Provided herein are phosphorus battery electrolyte additive chemicals for use in aqueous batteries that prevent self-discharge in the form of corrosion and hydrogen evolution, which increases the efficiency and extends the shelf-life of the batteries.

Systems, apparatuses, and / or the like are provided. In some embodiments, an electrochemical cell may include a container, a ring-shaped cathode disposed within the container, wherein the ring-shaped cathode defines an open interior, an anode disposed within the open interior of the ring-shaped cathode, a separator disposed between the cathode and the anode, an electrolyte solution, and a current collector electrically connected with a portion of the container, wherein the current collector is positioned at least partially within the anode. For example, current collectors may include a base including a first material that is fixedly attached to the portion of the container and a zinc component composed of a second material and fixedly attached to the base.

The invention discloses a defect-engineered nanosheet material for an alkaline aqueous battery as well as a preparation method and application of the defect-engineered nanosheet material, and belongs to the technical field of nano materials and electrochemical energy storage. The method comprises the following steps: firstly, dissolving 1, 3, 5-benzene tricarboxylic acid and bismuth nitrate pentahydrate in methanol, and carrying out hydrothermal reaction to obtain a bismuth-based metal-organic framework precursor; and then dispersing the precursor and ammonium halide in deionized water, and carrying out ion etching reaction through oil bath heating to obtain the bismuth oxyhalide nanosheet material. The prepared material has a self-supported hierarchical porous nanosheet structure, the surface of the material has wrinkles and pore channels, and the material contains oxygen vacancies and low-valence bismuth defects. The material can be used as a negative electrode to be applied to an alkaline aqueous battery, and after the material, a positive electrode material and alkaline electrolyte are assembled into a battery, the battery has high specific capacity, excellent rate capability and good cycle stability. The preparation method is simple in process and mild in condition, and the material performance can be optimized by adjusting etching parameters.

A method and apparatus for generating electricity using an electrochemical dual-pole fuel cell with a coiled aluminum wire disc as the anode, dual air-cathodes, and dual bioplastic electrolyte discs. The invention teaches the use of inexpensive materials and simplified dual-pole fuel cell construction and assembling of fuel cells into modules, and modules into electricity generators.

A negative electrode structure for a secondary battery (10) includes: a body (12) that is in a form of a foil or a thin plate and contains zinc as a base material; and a non-electron conductive film (11) provided on at least a first surface of the body (12). The film (11) is stretchable. The film (11) includes: an opening portion (13) formed to expose a portion of a first surface of the body (12); and an electrode reaction inhibiting portion (14) that surrounds the opening portion (13) and inhibits an electrode reaction in the body (12). The film (11) is attached to the body (12) in a liquid-tight manner.

This invention relates to a water electrolysis system for producing compressed hydrogen, the system comprising a water electrolysis cell stack, a multiphase pump disposed downstream of the electrolysis cell stack, and a hydrogen gas-liquid separator. The multiphase pump is disposed between the water electrolysis cell stack and the hydrogen gas-liquid separator. The invention also relates to a method for producing compressed hydrogen in a water electrolysis system, the method comprising: supplying deionized water or liquid electrolyte to the water electrolysis cell stack; producing hydrogen in the water electrolysis cell stack; compressing the generated hydrogen and a mixture of entrained deionized water or liquid electrolyte in the multiphase pump; and performing gas-liquid separation of the compressed generated hydrogen and the entrained deionized water or liquid electrolyte mixture in the hydrogen gas-liquid separator.

A method for filling oxygen into a NiMH battery module (1) comprising one battery cell (2), the battery module having a casing (4) encompassing the battery cell and a gas space, wherein each battery cell (2) comprises a first electrode, a second electrode, a porous separator, and an aqueous alkaline electrolyte arranged between the first electrode and the second electrode, wherein the casing (4) f comprises an inlet (25) for adding oxygen to the gas space of the battery cell (2). The method comprises monitoring (S72) battery module temperature and initiating filling of oxygen at an initial flow rate; and regulating the oxygen filling flow rate based on the monitored battery module temperature to avoid exceeding an upper temperature limit.

An alkaline storage battery according to the present invention includes: an electrode group (8) including a positive pole plate (1), a negative pole plate (3) opposing the positive pole plate (1), and a separator (5) disposed between the positive pole plate and the negative pole plate; a positive pole current collector (2) that contacts the positive pole plate; a negative pole current collector (4) that contacts the negative pole plate; and a pair of sealing plates (6) that extends in the direction of the thickness of the positive pole plate, the negative pole plate, and the separator, and surrounds the electrode group together with the positive pole current collector and the negative pole current collector, wherein the positive pole plate include a nickel-based positive pole base material having a three-dimensional framework, and a positive pole mixture that is applied to cover the whole surface of the base material, the positive pole current collector has a positive pole contact surface (2a) that contacts the whole of a positive pole outer surface (1a) of the positive pole plate, the negative pole plate includes a nickel-based negative pole base material having a three-dimensional framework, and a negative pole mixture that is applied to cover the whole surface of the negative pole base material, and the negative pole current collector has a negative pole contact surface (4a) that contacts the whole of a negative pole outer surface (3a) of the negative pole plate.

This invention belongs to the field of flow battery energy storage technology, and relates to a negative electrode electrolyte for alkaline all-iron flow batteries and its preparation method. The negative electrode electrolyte is prepared from iron salts, a complexing agent, a promoting component, an alkaline component, an auxiliary electrolyte, and water. The total iron concentration is 0.1–2.0 mol / L, the molar ratio of the complexing agent to the iron salt is 1.5–4, the molar ratio of the promoting component to Fe is 0.05–1.0, the alkaline component concentration is 2.0–6.0 mol / L, and the auxiliary electrolyte concentration is 0–2.0 mol / L. The negative electrode electrolyte of this invention for alkaline all-iron flow batteries has a high total iron concentration, which not only avoids the precipitation of elemental iron during charging and discharging, but also effectively prevents the formation of ferric hydroxide precipitate, improves the stability of iron ions, and greatly extends the cycle life of the negative electrode electrolyte. It can be widely used in aqueous alkaline all-iron flow batteries.

The invention relates to the field of electrochemical generators, in particular alkaline generators, and more particularly to that of accumulators. It especially relates to secondary generators with a zinc anode. It relates in particular to a method for preparing an electrochemical generator, comprising the steps of: • assembling a hydrophobic membrane with a cathode and a zinc anode, and then • adding an electrolyte which is an alkaline aqueous solution comprising at least one wetting agent and at least one antifoaming agent. The invention also relates to an electrochemical generator obtained by the method according to the invention.

This invention discloses an alkaline electrolyte for aluminum-air batteries, its preparation method, and its application. The electrolyte is composed of a strong alkaline solution, an organic solvent, and inorganic additives. The organic solvent consists of ethers and amides in a volume ratio of (35–90)%:(65–10)%, and the inorganic additives consist of metal salts and metal oxides in a molar ratio of (1–3):(1–2). The volume ratio of the organic solvent to the strong alkaline solution is (5–45):(95–55), and the concentration of the inorganic additives in the alkaline electrolyte for aluminum-air batteries is 0.005–0.3 mol / L. This invention, through the synergistic effect of solvation and interface regulation by the organic solvent and the strengthening effect of the inorganic additives on the interface film, inhibits the activity of free water, effectively suppresses hydrogen evolution corrosion of aluminum, reduces electrode polarization, improves the stability of the electrolyte, and significantly improves the electrochemical performance of aluminum-air batteries.

The invention discloses an alkaline zinc-iron flow battery electrolyte and a zinc-iron flow battery, and belongs to the field of flow batteries. According to the alkaline zinc-iron flow battery electrolyte, LiOH is adopted as a supporting electrolyte, so that the freezing point of a Na4Fe (CN) 6 or K4Fe (CN) 6 solution can be remarkably reduced, and the solubility and low-temperature stability of Fe (CN) 6 < 4-> are improved. According to the zinc-iron flow battery adopting the alkaline zinc-iron flow battery electrolyte, the solubility of Fe (CN) 64 <-> / Fe (CN) 63 <-> is improved by regulating and controlling the solvation structure of Fe (CN) 64 <->, and the stability of Fe (CN) 64 <-> / Fe (CN) 63 <-> at a lower temperature (-10 DEG C) is enhanced.

Provided is an alkaline battery (1) including a positive electrode (5), a negative electrode (7), a separator (6), and an electrolytic solution which are accommodated in a container (8). The electrolytic solution is a potassium hydroxide aqueous solution having a concentration of 40% to 50%. The negative electrode consists of a gel-like negative electrode mixture containing a negative electrode active material and an alkaline aqueous solution. The alkaline aqueous solution contains potassium hydroxide and sodium hydroxide in a molar ratio range of 89:11 to 96:4. The positive electrode consists of a positive electrode mixture including a positive electrode active material containing silver oxide and manganese dioxide, and a blending ratio of manganese dioxide in the positive electrode mixture is 25% to 50% by mass.

Disclosed herein are a metal-air fuel cell metal source material, a composite material comprising a metal selected from an alkali metal, an alkaline earth metal, aluminium, zinc, or iron, a conductive carbon material, and a binder, a redox-mediated metal-air fuel cell cartridge comprising a cartridge housing, and a composite material comprising a metal selected from an alkali metal, an alkaline earth metal, aluminium, zinc, or iron, a conductive carbon material, and a binder, and a redox-mediated metal-air fuel cell system comprising a redox flow cell and a first tank suitable to house an anolyte and a redox-mediated metal-air fuel cell cartridge. Also disclosed herein is a method of feeding a metal in a redox-mediated metal-air fuel cell system.

Materials, designs, and methods of fabrication for iron-manganese oxide electrochemical cells are disclosed. In various embodiments, the negative electrode is comprised of a pelleted, briquette, or pressed iron-containing component containing metallic iron or an iron-based compound (iron oxide, hydroxide, sulfide, or a combination thereof), collectively referred to as an "iron negative electrode." In various embodiments, the positive electrode is comprised of a pelleted, briquette, or pressed manganese-containing component, including manganese(IV) oxide (MnO), manganese(III) oxide (MnO), manganese(III) oxyhydroxide (MnOOH), manganese(II) oxide (MnO), manganese(II) hydroxide (Mn(OH)), or a combination thereof, collectively referred to as a "manganese oxide positive electrode." In various embodiments, the electrolyte comprises an aqueous alkali metal hydroxide, including lithium hydroxide (LiOH), sodium hydroxide (NaOH), potassium hydroxide (KOH), cesium hydroxide (CsOH), or a combination thereof. In various embodiments, the battery components are assembled in a prismatic or cylindrical shape.

The present invention relates to a hydrogel and use thereof. More specifically, the present invention relates to a hydrogel comprising water and a polymer matrix, wherein the polymer matrix comprises a copolymer of a monofunctional monomer having a hydrophilic group and one ethylenic unsaturated group, and a polyfunctional monomer having no ester bond, and having an amide group and 3 to 6 ethylenic unsaturated groups, 40 to 95 parts by mass of the water, and 5 to 60 parts by mass of the polymer matrix are contained in 100 parts by mass of the hydrogel, and the hydrogel shows a swelling degree of 650% or less, when the hydrogel is immersed in a 4M aqueous KOH solution under a temperature of 25°C for 14 days, and use thereof.

Provided herein are phosphorus battery electrolyte additive chemicals for use in aqueous batteries that prevent self-discharge in the form of corrosion and hydrogen evolution, which increases the efficiency and extends the shelf-life of the batteries.

A method of controlling water balance in a metal-air electrochemical cell during operation of the electrochemical cell involves controlling a ratio of partial pressure of water vapor in an inlet supply of air to equilibrium water vapor pressure of an electrolyte of the metal-air electrochemical cell. Controlling the ratio is done by controlling one or both of the partial pressure of water vapor in the inlet supply of air and the equilibrium water vapor pressure of the electrolyte. The method can be performed by a system having a programmable controller programmed to perform the method and configured to receive signals from sensors and control the relative humidity and temperature control devices based on the signals received from the sensors.

The goal is to enable high energy density. The dual electrolyte battery includes a cathode, an anode, a catholyte in contact with the cathode, and an anolyte in contact with the anode. The catholyte includes a first gelled electrolyte, and the anolyte includes a second gelled electrolyte. The concentration of the electrolyte in the anolyte is greater than the concentration of the electrolyte in the catholyte.

The invention relates to zinc-anode electrochemical generators and more particularly to storage batteries. The invention relates especially to zinc-anode secondary generators. More specifically, the invention is directed to an electrochemical generator with zinc electrode that contains an electrolyte which is an alkaline aqueous solution having a molarity of between 4M and 15M of hydroxyl anions and comprising: a) at least one wetting agent at a concentration of between 0.1 g / l and 50 g / l of electrolyte; and b) at least one antifoam agent in an amount of between 10 mg and 1000 mg per kilogram of electrolyte; a particular feature of this electrochemical generator is that - the electrolyte comprises the ionic wetting agent bis(2-ethylhexyl) phosphate; and / or - the electrolyte comprises at least one nonionic wetting agent selected from alkyl polyglucosides and from polyethylene glycol alkylphenyl ethers; and / or - the antifoam agents are selected from polyorganosiloxanes. The invention further pertains to a method for producing such a generator.

An air battery or cell in which copper or an alloy thereof serve as an oxygen reducing air electrode is provided. A magnesium air battery or cell comprises an alkaline electrolyte solution having at least a water-soluble electrolyte imparting conductivity and receiving a supply of oxygen or an oxygen supply compound, a metal copper or a copper alloy as an oxygen reduction air electrode (cathode), and a magnesium metal or an alloy thereof having a base electrode potential than the metal copper cathode as a negative electrode (anode), wherein the battery generates an electric force by the following reactions; Oxidation at the negative electrode (anode): 2Mg→2Mg2++4e-; and Reduction at the positive electrode (cathode): O2+2H2O+4e-→4OH-.

To provide a battery cell with improved cycle life and electrical performance during use. [Solution] A rechargeable battery cell includes electrodes and an ion exchange material arranged to define a mutually permeable interface with at least a portion of the electrodes. The closely contacting mutually permeable interface can be provided by completely or partially embedding the electrodes in the ion exchange material, or by surrounding the electrodes or discontinuities of the electrodes with a thin film of the ion exchange material. In one embodiment, the electrodes may be particles that are completely or partially embedded in the ion exchange material, coated with the ion exchange material, or in partial contact with the ion exchange material.

There is provided an LDH separator including a porous substrate and a hydroxide ion-conductive layered compound that is a layered double hydroxide (LDH) and / or a layered double hydroxide (LDH)-like compound, filling up pores of the porous substrate. The proportion of the hydroxide ion-conductive layered compound in the LDH separator is 25 to 85% by weight.