| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery preventing delamination between an active material layer and a collector caused by swelling and shrinking of an active material associated with charge-discharge cycles, and capable of being used for applications requiring a large current. <P>SOLUTION: A negative electrode collector 31 of a lithium ion secondary battery D1 has a laminated structure comprising a first negative electrode collector 31A and a second negative electrode collector 31B, the first negative electrode collector 31A is composed of a high-strength metallic material having tensile strength higher than that of the second negative electrode collector 31B, and the second negative electrode collector 31B is composed of a high-conductivity metallic material having a conductivity higher than that of the first negative electrode collector 31A. <P>COPYRIGHT: (C)2013,JPO&INPIT |
