Abstract: An electrolyte solution for an alkali metal-sulfur-based secondary battery, an alkali metal-sulfur-based secondary battery, and a module containing the alkali metal-sulfur-based secondary battery. The electrolyte solution includes a positive electrode containing a carbon composite material that contains a carbon material and a sulfur-containing positive electrode active material. The carbon material has a pore volume ratio (micropores/mesopores) of 1.5 or higher. The electrolyte solution contains a fluorinated ether represented by the following formula (1): R11—(OR12)n11—O—R13. In the formula, R11 and R13 are the same as or different from each other, and are each an alkyl group optionally containing a fluorine atom, with at least one of R11 or R13 containing a fluorine atom; R12 is an alkylene group optionally containing a fluorine atom; and n11 is 0, 1, or 2.

Abstract: The present invention provides an electrolyte which is capable of retaining a high magnesium ion concentration. An electrolyte in accordance with an aspect of the present invention is obtained by mixing a solvent, metal magnesium, and an elemental halogen.

Abstract: An electrolyte solution for an alkali metal-sulfur-based secondary battery, an alkali metal-sulfur-based secondary battery, and a module containing the alkali metal-sulfur-based secondary battery. The electrolyte solution includes a positive electrode containing a carbon composite material that contains a carbon material and a sulfur-containing positive electrode active material. The carbon material has a pore volume ratio (micropores/mesopores) of 1.5 or higher. The electrolyte solution contains a fluorinated ether represented by the following formula (1): R11—(OR12)n11—O—R13. In the formula, R11 and R13 are the same as or different from each other, and are each an alkyl group optionally containing a fluorine atom, with at least one of R11 or R13 containing a fluorine atom; R12 is an alkylene group optionally containing a fluorine atom; and n11 is 0, 1, or 2.

Abstract: The present invention provides an electrolyte which is capable of retaining a high magnesium ion concentration. An electrolyte in accordance with an aspect of the present invention is obtained by mixing a solvent, metal magnesium, and an elemental halogen.

Abstract: An object of the present invention is to provide an aqueous binder which (i) allows suppressing deterioration of an active material having high reactivity with water so as to enable the use of the active material, (ii) allows ensuring high strength of an electrode with a small amount of the aqueous binder used, and (iii) allows achieving a high output characteristic and the like of the electrode. The binder binds an active material and a conductive auxiliary agent to each other, each of the active material and the conductive auxiliary agent being a material of an electrode for an electrochemical device, and contains a proton in a system of the binder.