| abstract |
The safety of a nonaqueous electrolyte secondary battery is further improved. A nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the positive electrode has an α-NaFeO2 structure as an active material, and has a general formula LiMe1O2 (Me1 is Ni, Co, and Mn) A first transition metal complex oxide represented by a transition metal element) and an α-NaFeO2 structure, and a general formula Li1 + αMe21-αO2 (0 <α, Me2 is Ni and Mn, or Ni, Mn and A non-aqueous diffraction pattern in which a diffraction peak is observed in the vicinity of 21 ° in an X-ray diffraction diagram using CuKα rays. Electrolyte secondary battery. [Selection] Figure 1 |