| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous secondary battery which is superior in high- temperature characteristic. SOLUTION: In a secondary battery using lithium or a material capable of absorbing/releasing lithium in a negative electrode, having a nonaqueous electrolyte, and a positive electrode, a positive active material is a lithium manganese oxide having spinel structure, in which in an X-ray absorption spectrum measured by an X-ray absorption fine structure (XAFS) analysis method, peak, intensity in the vicinity of 2.5 Å in a radius vector structure function obtained by Fourier transform of a wide region X-ray absorption fine structure spectrum (EXAFS) of MnK absorption edge is 17.5 or less, when 90% of lithium capable of theoretically being discharged is discharged. |
