| 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+d=1.5, 0.25<d≤0.4, 1.1≤a+b+c<1.25 and 0.1≤a<0.5 are satisfied), 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 Li[NiCoMn[Li]]O(e+f+g+h=1.5, 0.15≤h≤0, 1.25≤e+f+g≤1.35 and 0.25≤e≤0.7 are satisfied), has a lamellar structure site changing to a spinel structure through charge or 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. |
