Additive for nonaqueous electrolyte solutions, nonaqueous electrolyte solution, and electricity storage device

An additive for nonaqueous electrolyte solutions, comprising a compound represented by the following formula (1):

• wherein in the formula (1),
• Q represents an alkenylene group having 4 to 7 carbon atoms and optionally substituted with a fluorine atom and forming a cyclic group together with the sulfur atom of the sulfonyl group,
• X represents a sulfonyl group, a phosphoryl group, or a carbonyl group,
• n represents 1 or 2,
• wherein the group represented by O—X—(R1)n is bonded to the 3-position of the cyclic sulfone in the formula (1),
• wherein
• when X is a sulfonyl group, R1 is selected from the group consisting of
• an alkyl group having 1 to 4 carbon atoms and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkenyl group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an alkynyl group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an aryl group substituted with at least one selected from the group consisting of a fluorine atom and an alkyl group substituted with a fluorine atom,
• an alkoxy group having 1 to 4 carbon atoms and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkenyloxy group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an alkynyloxy group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom, and
• an aryloxy group optionally substituted with at least one selected from the group consisting of a fluorine atom, an alkyl group substituted with a fluorine atom, and an alkoxy group,
• when X is a phosphoryl group, R1 is selected from the group consisting of
• an alkyl group having 1 to 4 carbon atoms and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkenyl group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an alkynyl group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an aryl group optionally substituted with at least one selected from the group consisting of a fluorine atom, an alkyl group, and an alkyl group substituted with a fluorine atom,
• an alkoxy group having 1 to 4 carbon atoms and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkenyloxy group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an alkynyloxy group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom, and
• an aryloxy group optionally substituted with at least one selected from the group consisting of a fluorine atom, an alkyl group, an alkyl group substituted with a fluorine atom, and an alkoxy group, and
• when X is a carbonyl group, R1 is selected from the group consisting of
• a methyl group substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkyl group having 2 or 3 carbon atoms and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkyl group having 4 carbon atoms, other than a tert-butyl group, and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• a tert-butyl group substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkenyl group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an alkynyl group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an aryl group optionally substituted with at least one selected from the group consisting of a fluorine atom, an alkyl group, and an alkyl group substituted with a fluorine atom,
• an alkoxy group having 1 to 4 carbon atoms and optionally substituted with at least one selected from the group consisting of a fluorine atom, an aryl group, and an aryl group substituted with a fluorine atom,
• an alkenyloxy group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom,
• an alkynyloxy group having 2 to 4 carbon atoms and optionally substituted with a fluorine atom, and
• an aryloxy group optionally substituted with at least one selected from the group consisting of a fluorine atom, an alkyl group, an alkyl group substituted with a fluorine atom, and an alkoxy group.