| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-capacity nonaqueous secondary battery superior in high-temperature cycle characteristics, storage suitability, and reliability.SOLUTION: A lithium secondary battery comprise: a positive electrode; a negative electrode; a separator; and a nonaqueous electrolyte. The nonaqueous electrolyte includes: a compound having a nitrile group in its molecule; lithium tetrafluoroborate; and an electrolytic salt. In the nonaqueous electrolyte, the content of the compound having a nitrile group in its molecule is 0.05-5.0 mass%, and the content of the lithium tetrafluoroborate is 0.05-2.5 mass%. |
