| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lithium secondary battery superior in a charging and discharging cycle characteristics, enabling solving of a problem of battery capacity reduction in a relatively short charge/discharge cycle caused by decomposition of an organic solvent in a nonaqueous electrolytic solution on a positive electrode side due to repetition of charge and discharge. SOLUTION: This lithium secondary battery comprises a positive electrode, a negative electrode and a nonaqueous electrolytic solution, including an organic solvent. In this battery, metal fluoride is added into a positive electrode active material. As the metal fluoride, one kind from among LiF, TiF4, VF5, MnF2, NiF2 and CoF2 is used. In the case of LiF, a content of the metal fluoride in the active material is set at 0.5-20 wt.%. LixNi1-yCoyOz (wherein 0<x<1.3, 0<=y<=1, 1.8<z<2.2) is used as the active material. |
