| 摘要 |
PROBLEM TO BE SOLVED: To reduce resistance of a separator and to improve mechanical strength thereof in order to provide high capacity and an excellent cycle characteristic even for a lithium ion secondary battery for a high-power application. SOLUTION: This separator is used for a lithium ion secondary battery provided with a positive electrode formed of a lithium-containing composite oxide, a negative electrode formed of a material capable of retaining lithium, the separator, and a nonaqueous electrolyte. By dispersing a lithium ion conducting substance of 0.5-10 wt.% with respect to the weight of the whole separator in the separator, lithium ion conductivity of the separator is improved, so that resistance of the separator can be reduced and mechanical strength thereof can be improved at the same time. COPYRIGHT: (C)2007,JPO&INPIT |
