CPC H01M 4/364 (2013.01) [H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); H01M 2004/028 (2013.01)] | 19 Claims |
1. A positive active material, comprising: a first particle and a second particle, the first particle has a chemical formula of LieCogM1-gO2-i, and the second particle has a chemical formula of LifCohN1-hO2-j, the element M includes at least two selected from the group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr; the element N includes at least one selected from the group consisting of Ni, Mn, Al, Mg, Ti, La, Y and Zr; and 0.8≤e≤1.2, 0<g<1, −0.1≤i≤0.2, 0.8≤f≤1.2, 0<h<1, −0.1≤j≤0.2, the number of types of the element M in the first particle is greater than the number of types of the element N in the second particles, wherein a particle diameter of the positive active material meets the following formula (3):
(Dv90-Dv50)−(Dv50-Dv10)≤2.5 equation (3)
Dv90 refers to a particle diameter reaching a volume accumulation of 90% from the small particle diameter side in the volume-based particle size distribution, Dv50 refers to a particle diameter reaching a volume accumulation of 50% from the small particle diameter side in the volume-based particle size distribution, Dv10 refers to a particle diameter reaching a volume accumulation of 10% from the small particle diameter side in the volume-based particle size distribution;
wherein Dv90 is within the range of 20.2 μm to 32.9 μm.
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