| 摘要 |
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery having a high initial discharge capacity and a satisfactory discharge rate characteristic even in the case of a positive electrode including, as a positive electrode active material, LiMPO(where 0.8≤x≤1.1; M represents at least one of Co, Ni, Mn, Fe, V and VO).SOLUTION: A lithium ion secondary battery of the present invention comprises: a positive electrode; a negative electrode; a separator; and a nonaqueous electrolytic solution having a nonaqueous solvent and an electrolyte. The positive electrode includes, as a positive electrode active material, LiMPO(where 0.8≤x≤1.1; M represents at least one of Co, Ni, Mn, Fe, V and VO). The nonaqueous electrolytic solution includes, as the electrolyte, 0.05-0.2 mol/L of LiBF, and 0.9-1.5 mol/L of LiPF.SELECTED DRAWING: Figure 1 |
