| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion second battery capable of restraining reduction of discharge capacity and increase of internal resistance caused by repetition of charge and discharge, and its manufacturing method. <P>SOLUTION: In the lithium ion second battery having a positive electrode active material made of complex oxide including lithium and transition metal, a negative electrode active material made of a carbon material, and a nonaqueous electrolyte including LiPF<SB>6</SB>, the nonaqueous electrolyte includes an anion compound expressed by formula (1), and carbonic ester. Here, M in formula (1) is transition metal as an element in III group, IV group, or V group in the periodic table, b expresses 1-3, m expresses 1-4, n expresses 0-8, and q expresses 0 or 1. <P>COPYRIGHT: (C)2010,JPO&INPIT |
