219results about "Aqueous electrolytes" patented technology

The invention relates to the technical field of water-based energy storage batteries, in particular to a two-phase electrolyte for a water-based zinc ion battery and a preparation method of the two-phase electrolyte, and the two-phase electrolyte comprises soluble zinc salt, water and quaternary ammonium nitrate; the soluble zinc salt comprises one of zinc trifluoromethanesulfonate, zinc bis (trifluoromethylsulfonyl) imide, zinc acetate, zinc sulfate and zinc chloride, and the molar concentration of the soluble zinc salt is 1-5 mol / L; the quaternary ammonium nitrate is one or more than two of tetramethylammonium nitrate, tetraethyl ammonium nitrate, tetrabutyl ammonium nitrate, hexadecyl trimethyl ammonium nitrate and octadecyl trimethyl ammonium nitrate, and the molar concentration of the quaternary ammonium nitrate is 1-3 mol / L. The preparation method is simple, convenient and efficient, the reversibility of the zinc anode is optimized, the method is crucial for promoting the design of a practical water-based zinc ion battery, and the application of the zinc-based battery in the field of energy storage is further accelerated.

This invention relates to a biomass-based gel electrolyte membrane, its preparation method, and its application. The method includes preparing regenerated cellulose using a sol-gel method, adding sodium alginate and zinc chloride solution, and rapidly constructing a biomass-based composite gel electrolyte with a dual-network structure through metal ion coordination crosslinking. The biomass-based gel electrolyte membrane is obtained by adsorbing an aqueous electrolyte onto a gel membrane with a dual-network structure. This gel electrolyte membrane is then assembled with a zinc anode and a vanadium pentoxide cathode to obtain a zinc-ion battery. This invention features a simple method, readily available and inexpensive raw materials, easy product molding, convenient operation and control, and is conducive to industrial production. The prepared composite gel electrolyte membrane has a dual-network structure, exhibiting good stability, liquid retention capacity, and ionic conductivity, and demonstrates excellent cycle capacity and lifespan when applied to aqueous zinc-ion batteries.

The invention discloses a high-cycle-performance aqueous battery, which comprises an aqueous electrolyte, a negative electrode, a first positive electrode and a second positive electrode, wherein the first positive electrode and the second positive electrode are positioned on two sides of the negative electrode, and a first diaphragm and a second diaphragm are respectively arranged between the first positive electrode and the negative electrode and between the second positive electrode and the negative electrode; the battery is provided with an electromagnetic valve, the electromagnetic valve is electrically connected with the first positive electrode and the second positive electrode to control switching of the positive electrodes in the charging and discharging loop, and every time discharging and charging circulation are completed, the electromagnetic valve switches the electrode connection relation, and the first positive electrode and the second positive electrode are alternately connected into the charging and discharging loop. Switching of the two positive electrodes in the aqueous battery is accurately controlled through the electromagnetic valve, a positive-negative battery structure is formed in real time, the double positive electrodes alternately perform lithium removal-lithium intercalation reaction, excessive Li intercalation or insufficient positive electrode reduction caused by long-term charging and discharging of a single positive electrode is avoided, the structural stability of the positive electrode material is improved, and the service life of the battery is prolonged. The cycle life and the electrochemical performance stability of the aqueous battery are obviously improved.

The invention discloses a method for preparing a vanadium electrolyte by electrochemistry-ultrasonic synergistic reduction of a waste vanadium catalyst in the technical field of solid waste resource utilization, which comprises the following steps of: roasting the waste vanadium catalyst by NaOH and leaching by sulfuric acid, applying 80Hz pulse current by adopting a titanium-based lead dioxide anode and a graphite cathode in a three-chamber electrolytic bath, synchronously starting a 25kHz and 300W ultrasonic field for synergistic reduction, and controlling the reaction temperature to be 35 + / -2 DEG C until the V < 5 + > concentration is less than 0.05 g / L; and then adding a chitosan-tea polyphenol composite stabilizer, and concentrating through a PVDF (Polyvinylidene Fluoride) ultrafiltration membrane to obtain electrolyte with the vanadium concentration of 1.8 mol / L, wherein the molar ratio of V < 4 + > to V < 3 + > is 1: 1.2, Fe < 3 + > is less than 15 ppm, and Al < 3 + > is less than 10 ppm. In the process, the vanadium recovery rate reaches 95.2%, the energy consumption is 2.8 kWh / kg vanadium and is reduced by 65% compared with that of a traditional process, and the cycle life of the electrolyte is prolonged to 1200 times or above.

The invention relates to an electrolyte for synergistically stabilizing positive electrode iodine multi-electron reaction through four-combination zinc salt and a high-surface-capacity zinc-iodine soft package battery. The electrolyte comprises the four-combination zinc salt and water, in the electrolyte, the total concentration of zinc ions in the four combinations of zinc salts is 2 + / -0.2 mol / L; the four-combination zinc salt is a four-combination zinc salt; the SO4 < 2-> in the electrolyte buffers the pH value of a system, so that side reaction of a negative electrode is reduced; cH3COO <-> can be cross-linked with I3 <->, so that shuttling of polyiodide is inhibited, and reversibility of a two-electron reaction is enhanced; bromide ions Br <-> in the electrolyte are chemically combined with I < + > through isohalogen to excite four-electron reaction; the trifluoromethanesulfonate OTf <-> with strong electronegativity surrounds the positive electricity I < + > by virtue of an ion atmosphere effect, so that active water molecule attack hydrolysis failure is avoided, a synergistic stable positive electrode iodine multi-electron reaction is realized, and the high-surface-capacity zinc-iodine soft package battery is beneficial to promoting the development of the zinc-iodine battery to practical application.

The disclosure provides batteries that have long-duration or long-lifetime for energy storage applications. In one aspect, the disclosure provides perylene diimide molecules that are water soluble and can be used as energy storage materials. In operation, the perylene diimide molecules are oxidized in an anode chamber and the electrons released in the oxidation process flow to the cathode chamber where they reduce a molecule in the cathode chamber. The perylene diimide molecules in accordance with many embodiments are highly compatible with polymeric materials that are inexpensive and easy to process, hence allowing for significantly reduced manufacturing costs.

A zinc / bromine flow battery comprises an electrolyte. The electrolyte comprises an active substance, a supporting electrolyte, and an additive. The additive is selected from at least one of 1-ethyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium chloride, 1-carboxymethyl-3-methylimidazolium bromide, and 1-carboxymethyl-3-methylimidazolium chloride. The use of the additive can regulate the deposition morphology of zinc and suppress zinc dendrites, and can also inhibit the diffusion of bromine on the positive electrode side, thereby improving the coulombic efficiency of the battery. Moreover, the complex product formed by the additive complexed with bromine does not produce solids during long-term cycling, whereas the complex product of conventional MEP in the later stage of battery cycling forms solids which are unevenly distributed on the electrode surface, reducing the voltage efficiency of the battery and shortening the service life of the battery.

The present disclosure provides a vanadium electrolyte, a preparation method and use thereof. The method includes: adding sulfuric acid into vanadium-containing ore, and stirring to obtain a mixture; curing the mixture to obtain a clinker; leaching the clinker with water to obtain a vanadium-containing leaching solution; adding a first impurity-removing agent into the vanadium-containing leaching solution to obtain a first purified solution; adding an oxidizing agent, a ferric phosphate dihydrate seed crystal and a second impurity-removing agent into the first purified solution to obtain a second purified solution; adding a reducing agent and a flocculating agent into the second purified solution, and filtering a resultant solution to obtain a filtered solution; mixing the filtered solution with an extraction liquid to obtain a vanadium-supported organic phase; stripping the vanadium-supported organic phase to obtain a stripping liquid; and removing an organic phase from the stripping liquid to obtain the vanadium electrolyte.

Systems and methods of the various embodiments may provide bifacial sealed gas diffusion electrode (GDE) assemblies. In some embodiments, a bifacial sealed gas diffusion electrode (GDE) assembly includes active electrode layers on two opposing sides of the assembly. Various embodiments may provide architecture and / or sealing methods for GDE assemblies. In various embodiments, the GDE assemblies may be for use in devices. In various embodiments, the devices may be primary or secondary batteries. In various embodiments, these devices may be useful for energy storage. For example, bifacial sealed GDE assemblies of the various embodiments may form cathode electrodes (sometimes called air electrodes) of a battery, such as a metal-air battery.

The invention discloses a microphase separation hydrogel electrolyte with ion selectivity and a preparation method and application thereof. The electrolyte is prepared by constructing a microphase separation polymer network composed of a polyanionic polymer and an ion exchange group-containing polymer in a synergistic manner and inducing crosslinking by using metal ions. The formation of a continuous ion transmission channel in the hydrogel is realized. The technical problem that high ionic conductivity and high ionic transference number are difficult to obtain at the same time in a traditional hydrogel electrolyte is solved, spatial unwrapping and selective coordination of a polymer chain segment are induced through a microphase separation structure, and directional construction of an ion channel is achieved; and the ion conductivity of the electrolyte is remarkably improved, and meanwhile, the target ion transference number is further improved. The prepared hydrogel electrolyte has high mechanical stability, high ion flux and excellent ion selectivity, and can be widely applied to high-performance electrochemical devices such as batteries.

The invention discloses a zinc ion battery and a preparation method thereof, the zinc ion battery comprises a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the zinc ion battery is characterized in that the positive electrode comprises a vanadium-based material, and the vanadium-based material comprises vanadium pentoxide intercalated by water molecules and metal ions and an MXene coating layer; the electrolyte comprises zinc salt, water and an additive, the additive comprises positive ions and negative ions, and the negative ions have the structure shown in the formula I. According to the zinc ion battery, water molecules and metal ions are used for intercalating vanadium pentoxide and coating MXene, and the water molecules and the metal ions are cooperatively used with the electrolyte with specific composition, so that ions can be quickly intercalated / deintercalated, the intrinsic conductivity of the material is enhanced, the structure of the material is stabilized, vanadium dissolution / metal ion dissolution at the positive electrode side can be prevented, and the service life of the zinc ion battery is prolonged. And the side reactions of interface hydrogen evolution and corrosion caused by decomposition of active water molecules on the zinc negative electrode side are synergistically inhibited. Through the comprehensive action of the factors, the zinc ion battery has excellent electrochemical performance.

The application provides an organic small-molecule electrolyte additive and application, and relates to the technical field of batteries. The organic small molecule is a carbon-containing three-membered ring alcohol small molecule, specifically, cyclopropanol, and the content of the electrolyte additive is 1%-10% v / v. Due to the metastable three-membered ring structure in the molecular structure of cyclopropanol, the ring-opening reaction is easily generated in the charging and discharging process, the electrode / electrolyte interface structure is reshaped, and the electrochemical performance is improved. Compared with conventional isopropyl alcohol, the cyclopropanol of the application can achieve the effect that excellent electrochemical performance can be presented only by adding a small amount of additive. The cyclopropanol has water solubility and organic co-solubility, and can form a uniform solution, and can be used in monovalent to multivalent ion energy storage systems of lithium, sodium, potassium, zinc, calcium, magnesium, cadmium, tin, aluminum, iron and the like, and will not have a negative impact on the solubility of the electrolyte, maintaining the high ionic conductivity of the electrolyte, which is simple, low in cost and good in application prospect.

This invention provides a modified positive electrode structure, a zinc-vanadium battery, and a method for preparing the same. [Solution] The zinc-vanadium battery comprises a modified positive electrode structure (including a positive electrode and a modified layer), a separator, a negative electrode, and an aqueous electrolyte. The positive electrode contains titanium. The modified layer is located on the positive electrode and contains 70-95 parts by weight of vanadium-based material, 3-45 parts by weight of conductive agent, and 3-45 parts by weight of binder. The separator is located on the modified layer. The negative electrode contains zinc and is located on the separator. The positive electrode, modified layer, separator, and negative electrode are all in the aqueous electrolyte. In the X-ray diffraction pattern of the vanadium-based material measured by XRD using CuKα1 rays, the peak intensity at 2θ=8°±1.0° is I8, and the peak intensity at 2θ=20°±1.0° is I 20 In that case, I8 and I 20 The ratio (I8 / I 20 ) is 0 <I8 / I 20 The condition ≤ 1.4 is satisfied. Furthermore, a modified cathode structure, a method for preparing the modified cathode structure, and a method for preparing a zinc-vanadium battery are also provided.

This invention discloses a type of sodium titanate with a layered crystal structure, its preparation method, and its application in aqueous magnesium-ion batteries, belonging to the field of aqueous magnesium-ion battery technology. This invention uses sodium titanate with a layered crystal structure as the negative electrode material in aqueous magnesium-ion batteries. Due to its excellent chemical and structural stability, sodium titanate can achieve reversible magnesium deposition in aqueous magnesium electrolytes. 2+ Intercalation / extraction. This invention synthesizes Na via a hydrothermal method and a high-temperature annealing process. 2 Ti 2 O 5 And Na 2 Ti 3 O 7 Materials. In magnesium chloride electrolyte, both sodium titanate materials exhibit extremely low charge / discharge potentials (Na). 2 Ti 2 O 5 -1.3 to -0.6V vs. SCE; Na 2 Ti 3 O 7 (-1.5 to -1V vs. SCE) and good cycle stability. Furthermore, Na... 2 Ti 2 O 5 The half-cell exhibits a charge-discharge specific capacity of up to 213 mAh / g at a current density of 2 A / g, and maintains a high specific capacity of 150 mAh / g even at a high current density of 10 A / g. The sodium titanate of this invention is an ideal anode material for aqueous magnesium batteries, possessing both low cost and environmental friendliness, and shows great promise for application in the field of aqueous magnesium-ion energy storage.

The instant invention relates to an electrolyte solution for a battery, the solution comprising an additive selected from the group consisting of polyquaternized polymers; the invention further relates the use of such additive and a battery comprising said additive.

A separator for a zinc ion battery, a method for preparing same, and a zinc ion battery including same are provided. The separator includes a separator substrate including a fiber material and a filler dispersed in the fiber material in a form of particles, wherein the filler is an ammonium phosphate salt.

The invention relates to a zinc acetate electrolyte containing acetohydroxamic acid and application of the zinc acetate electrolyte. The electrolyte is composed of a zinc acetate aqueous solution and an acetohydroxamic acid additive, wherein the addition concentration of acetohydroxamic acid is 0.1-1.4 mol / L. Hydroxyl and oximido contained in acetohydroxamic acid molecules can form a stable complex with zinc ions, the deposition kinetics of the stable complex is regulated and controlled, the stable complex is adsorbed on the surface of the zinc negative electrode to form a compact protective film, and therefore growth of zinc dendrites and side reactions are effectively inhibited. The electrolyte has the advantages of being good in stability, environmentally friendly, high in electrode compatibility and the like. When the material is applied to the aqueous zinc battery, the cycle stability and coulombic efficiency of the battery can be remarkably improved, and stable cycle of more than 2500 hours can be realized under the conditions of 1 mA / cm and 1 mAh / cm. The invention provides a reliable electrolyte solution for developing a water-based zinc battery with high performance and long service life.

Disclosed herein are anolytes comprising alkanolamine-base ligands and an iron-ion component. Also disclosed herein is a redox flow battery system comprising an anolyte comprising the alkanolamine-based ligand of the present disclosure, a catholyte; and an ion selective membrane disposed between the catholyte and anolyte. Also disclosed herein are methods of making and using the anolyte disclosed herein.

The invention discloses a zinc ion battery electrolyte containing phycocyanin as well as a preparation method and application of the zinc ion battery electrolyte. The zinc ion battery electrolyte is prepared from soluble zinc salt, phycocyanin and water, wherein the concentration of the phycocyanin is 0.1 mmol / L to 0.5 mmol / L; the concentration of the soluble zinc salt is 1 mol / L to 2 mol / L. In the zinc ion battery electrolyte disclosed by the invention, phycocyanin is a natural biomacromolecule which is natural, non-toxic, low in cost and environment-friendly, has various structures and is rich in various active functional groups, and the problems of high toxicity, single function, poor economic benefit and high cost of an organic additive in the prior art are solved. Besides, the zinc ion battery electrolyte can inhibit dendritic crystal growth, a stable interface layer is formed on the surface of a zinc negative electrode, side reactions are reduced, and the cycling stability and coulombic efficiency of the battery are improved.

The invention discloses an alkaline zinc-manganese battery low-temperature-resistant electrolyte which comprises sodium hydroxide and potassium hydroxide, the potassium hydroxide accounts for 25%-35% of the total mass of the electrolyte, the sodium hydroxide accounts for 0.2%-8% of the total mass of the electrolyte, and the balance is deionized water. At low temperature, the attraction capacity of sodium ions to water molecules is higher than that of potassium ions, so that free water is inhibited from forming hydrogen bonds for curing, a stable solvation shell layer of Na < + > can guide OH <-> to bypass a loose hydration shell layer of K < + >, migration resistance is reduced, the number of water molecules wrapped by positive ions is increased, the migration speed of the positive ions in a solution is improved in a low-temperature environment, and the migration rate of the positive ions in the solution is increased. And the conductivity of the solution is improved.

The invention relates to a zinc negative electrode with a stannous oxide protective layer constructed based on magnetron sputtering and a preparation method and application of the zinc negative electrode, and belongs to the technical field of aqueous zinc battery materials. The preparation method of the zinc negative electrode for constructing the stannous oxide protective layer based on magnetron sputtering comprises the following steps: depositing a stannous oxide protective layer on the surface of a pretreated zinc substrate in a mixed atmosphere of oxygen and argon by adopting a magnetron sputtering process and taking a metallic tin target as a sputtering source, and then carrying out annealing treatment in an air atmosphere to obtain the zinc negative electrode with the stannous oxide protective layer. Obtaining a finished product. The stannous oxide thin film provided by the invention has good zinc affinity, can induce uniform zinc nucleation and deposition, and has excellent electrochemical stability, so that side reactions such as hydrogen evolution and corrosion can be effectively inhibited; the obtained nano stannous oxide film remarkably reduces the zinc ion migration energy barrier, reduces the polarization voltage and prolongs the cycle life; and the preparation method is simple and convenient in process, controllable in parameters and suitable for large-scale preparation, and has good economical efficiency and application prospects.

The invention belongs to the technical field of zinc ion batteries, and provides an aqueous zinc ion battery electrolyte, a preparation method thereof and an aqueous zinc ion battery. The invention provides an aqueous zinc ion battery electrolyte. The aqueous zinc ion battery electrolyte comprises the following components: 1-2.5 mol / L of water-soluble zinc salt, 1-6g / L of an additive and water, the additive is 4, 7, 13, 21, 24-hexaoxa-1, 10-diazabicyclo [8, 8, 8] hexacodecane, and the pH value of the aqueous zinc ion battery electrolyte is less than or equal to 1. The additive is adsorbed on the surface of the zinc negative electrode prior to water molecules, and a thin and compact solid protective layer with good ionic conductivity and electronic insulation is generated in situ. The solid protective layer looks like a'raincoat 'for the zinc negative electrode to prevent the action of water molecules and the zinc negative electrode, and at the same time, the corrosion of hydrogen ions to the zinc negative electrode under strong acid conditions is shielded by tertiary amine ions formed by ionization of tertiary amine in the bridge crown ether.

The invention discloses a flaky aqueous zinc ion battery manganese-based positive electrode material as well as a preparation method and application thereof, and relates to the field of energy storage materials. The preparation method of the flaky aqueous zinc ion battery manganese-based positive electrode material comprises the following steps: S1, respectively dissolving a manganese source and a carbon source in deionized water, mixing, and reacting at room temperature to obtain a dispersion liquid; then filtering, washing and drying to obtain a precursor material; and S2, under the protection of nitrogen, calcining the precursor material at a high temperature, and cooling to obtain the flaky aqueous zinc ion battery manganese-based positive electrode material. Aiming at the problems of poor rate capability and fast capacity fading in the circulation process of the manganese-based compound positive electrode of the aqueous zinc ion battery, the invention solves the problems of complicated process flow, toxic used medicine and reagent, high preparation cost, difficulty in large-scale commercial production and the like in the method for improving the electrochemical performance of the manganese-based positive electrode in the prior art.

The application belongs to the technical field of aqueous zinc ion batteries, and specifically discloses an aqueous zinc ion battery electrolyte additive, an electrolyte and application thereof. The application provides application of a compound as shown in structure (I) as an electrolyte additive in an aqueous zinc ion battery, wherein R + represents one or more of H + , Na + and K + . The compound as an electrolyte additive in the aqueous zinc ion battery can improve the interface environment between the electrolyte and the zinc negative electrode, promote uniform distribution of an electric field and a zinc ion concentration field, reduce nucleation potential, and make the zinc deposition process more uniform. The compound can effectively solve the problems of zinc dendrite growth, zinc negative electrode corrosion and surface passivation, effectively reduce the consumption of the electrolyte, improve the utilization rate of zinc, and thus improve the rate performance and cycle performance of the aqueous zinc ion battery.

The invention belongs to the technical field of new energy materials, and relates to a preparation method for preparing a copper-doped carbon nanofiber coated cerium-doped manganous oxide composite material serving as a high-cycle-stability zinc positive electrode of an aqueous zinc ion battery by combining an electrostatic spinning method and high-temperature annealing.

The present application provides an electrode assembly, a battery, a battery module, a battery pack and a powered device. The electrode assembly comprises a first electrode piece, a second electrode piece with opposite polarity to the first electrode piece, and a separator arranged between the first electrode piece and the second electrode piece; the electrode assembly is obtained by winding the first electrode piece, the second electrode piece and the separator; and the separator comprises a base film and a coating provided on at least part of the surface of the base film, and the coating comprises a hydraulic inorganic material capable of hardening upon reaction with water. The present application can solve the problem of central hole collapse in the electrode assembly and the battery, and improve the safety performance and cycle performance of the battery.

An electrochemical reactor, which may be a half-cell of a rechargeable battery, comprises a liquid electrolyte which is pumped through the half-cell and has an electrochemical system in which a solid is deposited at an electrode while electric current is flowing. The liquid comprises a high molecular weight polymer or a viscoelastic surfactant enabling elastic turbulence to occur and the half-cell is configured to compel through flow to make changes in direction, so that elastic turbulence occurs, enhancing mass transport through the liquid and reducing overpotential at the electrode, which enhances uniformity of deposited solid and inhibits parasitic reactions.

The invention discloses a method for preparing nano manganese dioxide based on amino acid regulation and application. The method comprises the following steps: providing a mixed reaction system containing a manganese source precursor, a morphology regulating agent and water; the morphology regulating agent comprises amino acid; the manganese source precursor comprises a combination of permanganate and divalent manganese salt; and carrying out hydrothermal reaction on the mixed reaction system to prepare the nano manganese dioxide. The method provided by the invention shows unique advantages in the aspect of controlling the morphology and the structure of the material, the nano-scale manganese dioxide can be efficiently obtained, and the prepared nano-manganese dioxide has a relatively high specific surface area and a large number of active sites. Under the combined action of the structural characteristics, when the material is applied to a battery system, the electrochemical performance of the material can be effectively improved, and a new thought is provided for design and development of a high-performance battery material.

The invention relates to a redox cell, a method for storing power comprising a redox cell, a method for delivering power comprising a redox cell, an energy storage and / or delivery system, and the use of a redox cell or an energy system for storing or delivering power.

The application discloses a kind of low-cost, high-pressure-resistant water / organic two-phase electrolyte preparation method in the technical field of secondary battery high-performance electrolyte, comprising the following steps: first, prepare water-phase high-concentration double-salt electrolyte;Second, prepare organic phase electrolyte;Finally, when assembling lithium metal battery, water-phase high-concentration double-salt electrolyte is compounded with organic phase fluorinated electrolyte, that is, low-cost, high-pressure-resistant water / organic two-phase electrolyte is obtained, the application can be applied to lithium metal battery, improve the energy density, rate performance and safety of battery, and simultaneously reduce cost.