| 摘要 |
PROBLEM TO BE SOLVED: To suppress increase of resistance caused by the charging/discharging cycle of a lithium secondary battery using a "lithium excess type" positive electrode active material.SOLUTION: In a lithium secondary battery including a positive electrode, a negative electrode and nonaqueous electrolyte, the positive electrode has an α-NaFeOstructure, contains Co, Ni and Mn as transition metal Me, and contains a positive electrode active material in which at least one kind of element selected from Al, Zr and Ti exists on the particle surfaces of lithium-transition metal composite oxide of a molar ratio Li/Me>1 and a molar ratio Mn/Me>0.5. The negative electrode contains a negative electrode active material comprising a carbon material, sulfur existing on the negative electrode, and the nonaqueous electrolyte containing fluoroethylene carbonate.SELECTED DRAWING: None |
