| 摘要 |
PROBLEM TO BE SOLVED: To enhance the cycle characteristics of a nonaqueous electrolyte secondary battery. SOLUTION: A positive electrode uses manganese oxide having spinel skeletal structure as a main active material, a negative electrode is constituted with two layers of an intercalated carbon layer 31 and a metallic lithium layer 32. After charging terminal voltage reached 4.2V, negative electrode potential is always kept in the potential at which lithium metal deposits (0V vs Li<+> /Li or less), and positive electrode potential is 4.2V (vs Li<+> /Ii) or less. Manganese does not elute from the positive electrode, and the capacity deterioration attendant on charge/discharge cycles is sufficiently retarded. |
