| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery containing a high capacity oxide of Si in a negative electrode and having high safety. <P>SOLUTION: In a nonaqueous electrolyte secondary battery equipped with a negative active material comprising a core and the surface layer having different composition each other, the core has an oxide containing Si and the surface layer has a compound containing Li and at least one element selected from N, P, and S, and the negative active material layer does not have exothermic peak at 20°C or less in DSC (differential scanning calorimetry). <P>COPYRIGHT: (C)2006,JPO&NCIPI |
