| 摘要 |
PROBLEM TO BE SOLVED: To provide: a nonaqueous electrolyte by which the worsening of a capacity and rate characteristic can be suppressed even in use under a high-voltage condition after being stored under a high-temperature condition (e.g. 60°C or higher); and a lithium ion secondary battery using such a nonaqueous electrolyte.SOLUTION: A nonaqueous electrolyte of the present invention comprises: an anion expressed by the general formula (1), [N(XSO)(FSO)](where X represents a fluorine atom, an alkyl group with 1-6C or a fluoroalkyl group with 1-6C); a lithium cation; and an anhydride including an aromatic ring, and at least one structure expressed by -C(=O)-O-C(=O)- in its molecule.SELECTED DRAWING: None |
