| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deformation of an outside can enhance charging/ discharge performance, and also increase capacity density by setting the degree of the recess of a can to a predetermined value or more. SOLUTION: A positive electrode 1 containing a lithium manganese compound oxide and a negative electrode 2 facing mutually via separates 3, 4 and organic electrolyte are contained in a space formed by a positive electrode 5 can and a negative electrodecan 7, and the opening is sealed by arranging a gasket 9 between the cans 5, 7. In this case, the degree of the recess of the can -Δ/can bottom area S is set to 0.0025/cm (hereafter this is designated as Y1 value) or more. As to the Y1 value, if its range is reduced to 0.004/cm (hereafter this is designated as Y2 value) or more, and more desirably to 0.007/cm (hereafter this is designated as Y3 value) or more, it is further desirable. Thereby, the deformation of an outside can is prevented so that much more electric capacity can be stored. |
