CPC H01M 4/525 (2013.01) [C01G 53/42 (2013.01); C01G 53/50 (2013.01); H01M 4/505 (2013.01); H01M 10/0525 (2013.01); C01P 2002/72 (2013.01); C01P 2004/03 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2006/10 (2013.01); C01P 2006/12 (2013.01); C01P 2006/16 (2013.01); C01P 2006/40 (2013.01); H01M 4/131 (2013.01); H01M 4/1391 (2013.01); H01M 10/052 (2013.01); H01M 2004/028 (2013.01)] | 17 Claims |
1. A powderous positive electrode material for a lithium secondary battery, the powderous positive electrode material having the general formula Li1+x[Ni1−a−b−cMaM′bM″c]1−xO2−z;
M being either one or more elements selected from the group consisting of Mn, Zr and Ti,
M′ being either one or more elements selected from the group consisting of Al, B and Co,
M″ being a dopant different from M and M′,
x, a, b and c being expressed in mol with −0.02≤x≤0.02, 0≤c≤0.05, 0.10≤(a+b)≤0.65 and 0≤z≤0.05; and wherein the powderous positive electrode material is characterized by having a BET value ≤0.37 m2/g, a Dmax<50 μm, and a hardness strength index Δ Γ(P) of no more than 100%+(1−2a−b)×160% for P=200 MPa, wherein
with D10P=0 being the D10 value of an unconstrained powder (P=0 MPa), Γ0(D10P=0) being a cumulative volume particle size distribution of the unconstrained powder at D10P=0, and ΓP(D10P=0) being the cumulative volume particle size distribution at D10P=0 of pressed samples with P being expressed in MPa.
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