| abstract |
(57) [Summary] [Problem] To prevent the electrolytic solution from being oxidatively decomposed or reductively decomposed even when the battery temperature rises, thereby swelling the battery, increasing the internal resistance of the battery, and , A precursor battery capable of suppressing a decrease in the charge / discharge capacity of the battery, An object is to provide a lithium secondary battery and a method for manufacturing the lithium secondary battery. SOLUTION: A precursor cathode containing a precursor cathode active material, In a precursor battery including a precursor negative electrode and a nonaqueous electrolyte, a lithium manganese composite oxide having a manganese valence of approximately three is used as the precursor positive electrode active material. |