| 摘要 |
PURPOSE: To provide a nonaqueous secondary battery in which electrolyte is hardly decomposed even if the battery is stored at high charged voltage in high temperature atmosphere, decrease in capacity and self discharging caused by the decomposition of the electrolyte are retarded, and high reliability is insured. CONSTITUTION: A lithium transition metal composite oxide particle to which fluorination treatment is conducted is used as positive electrode material. The fluorination treatment of the lithium transition metal composite oxide is conducted with fluorine compound represented by, for example, R1 R2 R3 R4 NF (wherein R1 , R2 , R3 , R4 are H or an alkyl group having 1-4 carbon atoms). |
