Abstract: A redox flow battery operation method that performs charge and discharge by circulating an electrolyte between a tank and a first battery cell, the method includes a main process performing the charge at a current density greater than or equal to 250 mA/cm2.

Abstract: A redox flow battery includes a tank configured to store an electrolyte and a distribution mechanism to distribute the electrolyte to a battery cell. The tank has a partition portion partitioning a space inside the tank into a first space and a second space, the distribution mechanism has a distribution passage through which the electrolyte is distributed between the first space and the second space via the battery cell, and the partition portion is composed of a flexible material.

Abstract: A redox flow battery includes a positive electrolyte containing a positive electrode active material and a negative electrolyte containing a negative electrode active material. A liquid amount of the positive electrolyte is different from a liquid amount of the negative electrolyte. Of the positive electrolyte and the negative electrolyte, a liquid amount ratio of the electrolyte larger in liquid amount to the electrolyte smaller in liquid amount is not lower than 1.05 and not higher than 5.0. A state of charge of a mixture electrolyte which is a mixture of the positive electrolyte and the negative electrolyte at a ratio equal to the liquid amount ratio is equal to or higher than 2%.

Abstract: There is provided a titanyl sulfate hydrate powder comprising 25 to 40% by mass of titanium element in terms of TiO2, 40 to 60% by mass of sulfur element in terms of H2SO4, and niobium element in such an amount that a molar ratio of niobium element to titanium element (Nb/Ti) is 0.00005 to 0.012, with a molar ratio of the sulfur element content to the titanium element content (S/Ti) being 1.1 to 1.5, and comprising crystalline titanyl sulfate dihydrate (TiOSO4·2H2O). Thus, the present invention can provide a titanyl sulfate hydrate powder with a high dissolution rate in water and a production method therefor, as well as a method for producing an aqueous titanyl sulfate solution, a method for producing an electrolyte and a method for producing a redox flow battery, using the titanyl sulfate hydrate powder.

Abstract: A redox flow battery includes a tank configured to store an electrolyte and a distribution mechanism to distribute the electrolyte to a battery cell. The tank has a partition portion partitioning a space inside the tank into a first space and a second space, the distribution mechanism has a distribution passage through which the electrolyte is distributed between the first space and the second space via the battery cell, and the partition portion is composed of a flexible material.

Abstract: A raw material of an electrolyte solution that is to be dissolved in a solvent to form an electrolyte solution, and the raw material of an electrolyte solution is a raw material of an electrolyte solution that is a solid or semisolid that contains Ti in an amount of 2 mass % to 83 mass % inclusive, Mn in an amount of 3 mass % to 86 mass % inclusive, and S in an amount of 6 mass % to 91 mass % inclusive.

Abstract: There is provided a titanyl sulfate hydrate powder comprising 25 to 40% by mass of titanium element in terms of TiO2, 40 to 60% by mass of sulfur element in terms of H2SO4, and niobium element in such an amount that a molar ratio of niobium element to titanium element (Nb/Ti) is 0.00005 to 0.012, with a molar ratio of the sulfur element content to the titanium element content (S/Ti) being 1.1 to 1.5, and comprising crystalline titanyl sulfate dihydrate (TiOSO4.2H2O). Thus, the present invention can provide a titanyl sulfate hydrate powder with a high dissolution rate in water and a production method therefor, as well as a method for producing an aqueous titanyl sulfate solution, a method for producing an electrolyte and a method for producing a redox flow battery, using the titanyl sulfate hydrate powder.

Abstract: A raw material of an electrolyte solution that is to be dissolved in a solvent to form an electrolyte solution, and the raw material of an electrolyte solution is a raw material of an electrolyte solution that is a solid or semisolid that contains Ti in an amount of 2 mass % to 83 mass % inclusive, Mn in an amount of 3 mass % to 86 mass % inclusive, and S in an amount of 6 mass % to 91 mass % inclusive.

Abstract: A redox flow battery includes a battery cell including a positive electrode, a negative electrode, and a membrane disposed between these two electrodes; a positive electrode electrolyte supplied to the positive electrode; and a negative electrode electrolyte supplied to the negative electrode, wherein the positive electrode electrolyte contains manganese ions and a phosphorus-containing substance, the negative electrode electrolyte contains at least one species of metal ions selected from titanium ions, vanadium ions, chromium ions, and zinc ions, and a concentration of the phosphorus-containing substance is 0.001 M or more and 1 M or less.

Abstract: A redox flow battery includes a battery cell including a positive electrode, a negative electrode, and a membrane disposed between these two electrodes; a positive electrode electrolyte supplied to the positive electrode; and a negative electrode electrolyte supplied to the negative electrode, wherein the positive electrode electrolyte contains manganese ions and a phosphorus-containing substance, the negative electrode electrolyte contains at least one species of metal ions selected from titanium ions, vanadium ions, chromium ions, and zinc ions, and a concentration of the phosphorus-containing substance is 0.001 M or more and 1 M or less.

Abstract: An inventive electrolyte material contains a lithium salt comprising the following components (A1) and (B), or contains the following components (A1), (A2) and (B): (A1) a lithium cation; (A2) an organic cation; and (B) a cyanofluorophosphate anion represented by the following general formula (1): ?P(CN)nF6-n??(1) wherein n is an integer of 1 to 5. The inventive electrolyte material is excellent in electrochemical properties, i.e., has a higher electrical conductivity and a higher oxidation potential, and is capable of forming an electrode protection film, so that a highly safe lithium secondary battery can be provided.

Abstract: An inventive electrolyte material contains a lithium salt comprising the following components (A1) and (B), or contains the following components (A1), (A2) and (B): (A1) a lithium cation; (A2) an organic cation; and (B) a cyanofluorophosphate anion represented by the following general formula (1): ?P(CN)nF6-n??(1) wherein n is an integer of 1 to 5. The inventive electrolyte material is excellent in electrochemical properties, i.e., has a higher electrical conductivity and a higher oxidation potential, and is capable of forming an electrode protection film, so that a highly safe lithium secondary battery can be provided.

Abstract: The present invention provides an ionic liquid useful for a lithium secondary battery, which is excellent in performance as an electrolyte material, such that the liquid has ionic conductance and a wide potential window, and is excellent in safety, as well as an electrolyte using the same. The present invention relates to an ionic liquid including a cyanophosphate-based anion represented by the following general formula (1), and an electrolyte using the same, a lithium secondary battery, and a process for producing the ionic liquid. [Chem 1] ?P(CN)nX6-n??(1) (Wherein X is a halogen atom and n is an integer of 1 to 6.