| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the resistance rise of a battery when a nonaqueous electrolyte secondary battery using a negative electrode containing at least one kind of silicon, germanium, tin, and lead as an active material is left under high temperatures of not less than 60°C. <P>SOLUTION: In this nonaqueous electrolyte secondary battery equipped with the negative electrode having a substance containing at least one kind of silicon, germanium, tin, and lead, a positive electrode having a lithium cobalt based composite oxide expressed by a general formula Li<SB>x</SB>Co<SB>y</SB>M<SB>1-y</SB>O<SB>2</SB>(M is one or more metal elements except Co, 0.2≤x≤1.1, 0.2≤y≤1) as an active material, and a nonaqueous electrolyte, iron is contained in the electrolyte. <P>COPYRIGHT: (C)2008,JPO&INPIT |
