| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte that can bring about a nonaqueous electrolyte secondary battery having improved initial charging capacity, I/O characteristics, and impedance characteristics.SOLUTION: The nonaqueous electrolyte contains a nonaqueous solvent containing ethylene carbonate and ethyl methyl carbonate, LiPFand a fluorosulfonic acid salt represented by a formula: M(FSO)x, and further contains at least one kind selected from chain carboxylic acid ester, and the like, and/or at least one kind selected from biphenyl, alkyl biphenyl, terphenyl, and partially hydrogenated substance of terphenyl, cyclohexyl benzene, t-butylbenzene, t-amyl benzene, diphenyl ether and dibenzofuran, where the amount of ethylene carbonate in nonaqueous solvent 100 vol% is 3 vol% or more and 80 vol% or less, and the amount of ethyl methyl carbonate is 15 vol% or more and 90 vol% or less.SELECTED DRAWING: None |
