| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly reliable lithium ion secondary battery causing no expansion of the battery by overcharge, and adopting a lightweight aluminum laminate as a case material. <P>SOLUTION: In this lithium ion secondary battery, a battery element formed by laminating or winding a positive electrode, a separator having an electrolyte containing Li salt, and a negative electrode is sealed by an aluminum laminate sheet. The gel electrolyte contains a polymer of a compound expressed by the formula: B[O(C<SB>a</SB>H<SB>2a</SB>O)<SB>b</SB>]<SB>3</SB>Z<SB>3</SB>(1). In the formula, Z is a polymerizable functional group, (a) and (b) are integers of 1-6. <P>COPYRIGHT: (C)2007,JPO&INPIT |
