| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolytic secondary battery having a high degree of incombustibility and safety, having the capability of generating high voltage and further having a high charging and discharging function by composing a nonaqueous electrolyte of a nonaqueous solvent containing a phosphoric ester compound and a chained carbonate compound. and an electrolyte. SOLUTION: The nonaqueous electrolyte of a secondary battery is composed of a nonaqueous solvent containing the phosphoric ester compound expressed by the formula I and the chain carbonate compound expressed by the formula II, and an electrolyte. In the formula I, -C- stands for straight chain or branched hydrocarbon, and (k), (l) and (m) stand for an integer between 1 and 3. In addition, X1 to X3 may be identical to or different from each other, and a hydrogen atom, an alkoxy group or an alkyl group-substituted amino group. In the formula II, R<1> and R<2> are an alkyl group having carbons between 1 and 3. Also, lithium salt such as LiPF6 , LiBF4 , LiClO4 , and LiAsF6 is mentioned as an electrolyte dissolved in the nonaqueous electrolyte. The nonaqueous electrolyte may be used for a cylindrical nonaqueous electrolytic secondary battery. |
