| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery which is difficult to deteriorate in charge/discharge capacity even after storage, the lithium ion secondary battery using a lithium manganese-based composite oxide exhibiting high capacity while needing activation treatment, as a positive electrode active material. <P>SOLUTION: In the lithium ion secondary battery, SiO<SB POS="POST">x</SB>is used as a negative electrode active material, and at least one compound selected from the group consisting of a polycyclic hydrocarbon compound represented by the following general formula (1) (in the formula, R represents a mono- or poly-cyclic hydrocarbon group having 5 or more carbon atoms and including an alicyclic hydrocarbon group and/or an aromatic hydrocarbon group) and derivatives thereof is added in an electrolyte. Deterioration in charge/discharge capacity after storage can be suppressed by the cooperation of SiO<SB POS="POST">x</SB>and the additive. <P>COPYRIGHT: (C)2013,JPO&INPIT |
