| 摘要 |
PROBLEM TO BE SOLVED: To improve a cycle characteristic and a preserving characteristic by including a specific weight rate of at least one kind of compound composed of a mixed type of cyclic carbonic ester and chain carbonic ester and selected from stearic acid ester, palmitic acid ester and a specific phosphorus compound. SOLUTION: A nonaqueous electrolyte contains 1 to 5 wt.% of at least one kind of compound selected from a phosphorus compound expressed by the formula (in the formula, R1, R2 represent each an alkyl group or a halogenated alkyl group, and (n) is an integer of 1 to 10). A positive electrode sheet, a separator, a negative electrode sheet and a separator are laminated/wound in this order to manufacture a power generation element to be housed in a battery can. The electrolyte is filled to be sealed by a battery lid. The upper edge part of a positive electrode is welded to an upper current collecting plate, the lower edge part of a negative electrode is welded to a lower current collecting plate, and the reverse of the battery lid is connected to the inside bottom surface of the battery can through a lead piece. |
