| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress deterioration due to redox decomposition of a nonaqueous electrolyte in a lithium ion secondary battery using a positive electrode active material composed of a lithium manganese based oxide containing a lithium (Li) element and a tetravalent manganese (Mn) element and having a crystal structure belonging to a layered rock-salt structure. <P>SOLUTION: Since about 1.0 mass% of 1,3-propane sulton is added into a nonaqueous electrolyte, storage capacity and recovery capacity are enhanced when a lithium ion secondary battery is stored at high temperature, and increase in the internal resistance is suppressed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
