| 摘要 |
PROBLEM TO BE SOLVED: To made nonauqeous solvent used for nonaqueous electrolyte nonflammable and to improve the cycle characteristic of a battery by including phosphate compound or radical polymerization inhibitor in the nonaqueous electrolyte. SOLUTION: Phosphate compound contained in nonaqueous electrolyte is expressed by formula I. In the formula I, R1-R4 are a substituted or non- substituted cyclic aromatic group; and is a substituted or non-substituted cyclic aromatic group or heterocycle. Preferably, R1-R4 are each a phenyl group, a benzyl group, etc., and A is an ortho, meta, or para position substituted phenyl group, substituted biphenyl group, or bisphenol A. A phenotiazine compound expressed by formula II is preferable for the radial polymerization inhibitor contained in the nonaqueous electrolyte. In formula II, R5-R7 are each hydrogen atom, a substituted or non-substituted straight chain or branch alkyl group, etc., and X is absent or 1-2 (integer) oxygen atoms. |
