| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary battery less in expansion of a sheath can after charge while securing a high battery capacity by efficiently occupying the space. <P>SOLUTION: A wound body 20 having a laminated structure of a positive electrode 21, a negative electrode 22, and a separator 23 is housed in the sheath can 11. The sheath can 11 is constituted of an iron alloy, and its shape is an equilateral quadrangular pillar having the bottom face of a square. In the negative electrode 22, at least either one of silicon or tin, or a negative electrode active material layer 22B containing metal lithium is installed on a negative electrode current collector 22A. <P>COPYRIGHT: (C)2009,JPO&INPIT |
