| 摘要 |
A non-aqueous electrolytic solution containing a ketone compound having the formula (I): <CHEM> Äeach of R<1> and R<2> independently represents a linear or branched alkyl group; and each of R<3>, R<4>, R<5> and R<6> independently represents a hydrogen atom or a linear or branched alkyl group; provided that R<1> and R<4> can be combined to form a cycloalkanone ring in conjunction with a propanone skeleton to which R<1> and R<4> are connected, that two or more of an alkyl group of R<2>, an alkyl group of R<5>, a branched chain of an alkyl group of R<1>, and a branched chain of an alkyl group of R<4> can be combined to form a cycloalkane ring, or that an alkyl group of R<1> and an alkyl group of R<2> and/or an alkyl group of R<4> and an alkyl group of R<5> can be combined to each other to form a cycloalkane ringÜ is favorably employed as a constituent material for preparing a lithium secondary battery that is excellent in the battery performances and cycle performance. |
