| 摘要 |
PROBLEM TO BE SOLVED: To improve the safety of a nonaqueous electrolyte secondary battery. SOLUTION: The surface of a negative electrode is coated with one of amorphous compounds containing at least C, F, P, Li and at least one kind from among transition metal elements, and it is desirable that the transition metal element of the amorphous compound is Mn and that a divalent oxidation state should be exist. Furthermore, an amorphous coat is formed on the negative electrode, which coat has such a chemical property that the chemical shift with H3P04 as reference has a signal in the vicinity of 10 ppm under the condition that chemical condition of P be in a solid NMR (31P-NMR) of P, and similarly a chemical shift with LiCl as reference has a signal in the vicinity of 0 ppm under the condition that the chemical condition of Li be in a solid NMR (7Li-NMR) of Li, among the amorphous compounds mentioned. |
