NONAQUEOUS ELECTROLYTE AND POWER STORAGE DEVICE USING THE SAME

To provide a nonaqueous electrolyte capable of improving a capacity maintenance rate and a gas suppression effect and a power storage device using the same.SOLUTION: A nonaqueous electrolyte for a power storage device contains a compound of 0.01 to 10 mass%, expressed by the following general formula (I) and a compound of 0.01 to 10 mass% expressed by the following general formula (II).(In each of the formulas, Rf expresses a fluorination alkyl group having 1 to 6 carbons, in which at least one hydrogen atom is replaced with a fluorine atom, a fluorination alkenyl group having 2 to 6 carbons, in which at least one hydrogen atom is replaced with a fluorine atom, a fluorination alkynyl group having 3 to 6 carbons, in which at least one hydrogen atom is replaced with a fluorine atom, and a fluorination aryl group having 6 to 12 carbons, in which at least one hydrogen atom is replaced with a fluorine atom. Also, in each of the formulas, Rand Reach indicate an alkyl group of the hydrogen atom or 1 to 6 carbons, independently, and Rand Rmay be coupled to each other to form a ring.SELECTED DRAWING: None 【課題】容量維持率とガス抑制効果を向上できる非水電解液及びそれを用いた蓄電デバイスの提供。【解決手段】下記一般式（Ｉ）で表される化合物を０．０１〜１０質量％と、下記一般式（ＩＩ）で表される化合物を０．０１〜１０質量％含有する蓄電デバイス用非水電解液。（式中、Ｒｆは少なくとも１つの水素原子がフッ素原子で置換された炭素数１〜６のフッ素化アルキル基、少なくとも１つの水素原子がフッ素原子で置換された炭素数２〜６のフッ素化アルケニル基、または少なくとも１つの水素原子がフッ素原子で置換された炭素数３〜６のフッ素化アルキニル基、少なくとも１つの水素原子がフッ素原子で置換された炭素数６〜１２のフッ素化アリール基を示す。また、式中、Ｒ１およびＲ２はそれぞれ独立に、水素原子または炭素数１〜６のアルキル基を示し、Ｒ１とＲ２が互いに結合し環を形成してもよい。）【選択図】なし