To provide an ionic liquid which has at least one of properties such as high ionic conductivity, a small reduction in ionic conductivity at a low temperature, a low melting point, and a low viscosity. To provide a power storage device having higher initial charge and discharge efficiency than a power storage device containing a conventional ionic liquid. A cyclic quaternary ammonium salt is liquid at room temperature and contains a quaternary spiro ammonium cation having an asymmetrical structure including two aliphatic rings and one or more substituents bonded to one or both of the two aliphatic rings and an anion corresponding to the quaternary spiro ammonium cation. The power storage device includes a positive electrode, a negative electrode, and a nonaqueous electrolyte containing the cyclic quaternary ammonium salt as a nonaqueous solvent.
提供一种
离子液体,具有高离子导电性、低温下离子导电性降低少、低熔点和低粘度等特性之一。提供一种比传统
离子液体储能装置具有更高初始充放电效率的储能装置。环状季
铵盐在室温下为液态,并包含一个不对称结构的季
铵螺环阳离子,包括两个脂环和一个或多个连接到两个脂环之一或两个的取代基,以及对应于季
铵螺环阳离子的阴离子。该储能装置包括正极、负极和含有环状季
铵盐作为非
水溶剂的非
水电解质。