| 摘要 |
PROBLEM TO BE SOLVED: To provide: a positive electrode active material capable of achieving excellent discharge operating voltage and initial rate characteristics while maintaining high discharge capacity; and a positive electrode for an electric device including the positive electrode active material; and an electric device.SOLUTION: A positive electrode active material contains: a solid solution lithium-containing transition metal oxide A which is represented by Li[NiCoMn[Li]]O(a, b, c and d satisfy relationships of a+b+c+d=1.5, 0.1<d≤0.4, 1.1≤a+b+c<1.4, 0.2≤a≤0.7 and 0<b/a<1), has a lamellar structure site changing to a spinel structure through charge/discharge in a potential range of 4.3 V or more and 4.8 V or less, and has a change rate into the spinel structure of 0.25 or more and less than 1.0; and a lithium-containing transition metal oxide B which is represented by LiMMnO(M represents Cr or Al, and a relationship of 0≤x<2 is satisfied), and has a spinel structure. |
