| abstract |
(57) [Summary] (Modified) [Structure] A positive electrode whose main component is a compound capable of inserting and extracting lithium, and a negative electrode whose main component is a carbon material whose main component is graphite. Electrolyte solute in a solvent containing a separator interposed between both electrodes, a compound represented by Chemical formula 1, a compound represented by Chemical formula 2, at least one cyclic compound selected from the group consisting of sulfolane and its derivatives And an electrolytic solution in which is dissolved. [Chemical 1] However, in reduction 1, -A 1 - and -A 2 - is, -O -, - NH -, - S- or -CH 2 -, A 3 and A 4 is a hydrogen atom or an alkyl group. [Chemical 2] However, in reduction 2, -A 5 - and -A 6 - is -NH- or -CH 2 -,> A 7 is>O,> NH or> S, A 8 and A 9 are, It is a hydrogen atom or an alkyl group. [Effect] The battery capacity is large and the charge / discharge efficiency is high. |