LITHIUM METAL COMPLEX OXIDE POWDER, POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERIES, AND LITHIUM SECONDARY BATTERY
A lithium metal complex oxide powder satisfies requirements (1) to (3): Requirement (1): Composition Formula (I) is satisfied, Li[Li x (Ni (1−y−z−w) Co y Mn z M w ) 1−x ]O 2 . . . (I) (where M is one or more elements selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, B, Mo, Nb, Zn, Sn, Zr, Ga, La, and V, and −0.1≤x≤0.2, 0≤y≤0.4, 0≤z≤0.4, and 0≤w≤0.1 are satisfied). Requirement (2): an average primary particle diameter is 1 μm or more and 7 μm or less. Requirement (3): R1/Ra, which is a ratio of the average primary particle diameter represented by R1 to an average crystallite diameter represented by Ra, is more than 5.0 and 20 or less.
1 . A lithium metal complex oxide powder satisfying requirements (1) to (3):
the requirement (1): Composition Formula (I) is satisfied;
Li[Li x (Ni (1−y−z−w) Co y Mn z M w ) 1−x ]O 2 (I)
(where M is one or more elements selected from the group consisting of Fe, Cu, Ti, Mg, Al, W, B, Mo, Nb, Zn, Sn, Zr, Ga, La, and V, and −0.1≤x≤0.2, 0≤y≤0.4, 0≤z≤0.4, and 0≤w≤0.1 are satisfied)
the requirement (2): an average primary particle diameter is 1 μm or more and 7 μm or less; and
the requirement (3): R1/Ra, which is a ratio of the average primary particle diameter represented by R1 to an average crystallite diameter represented by Ra, is more than 5.0 and 20 or less.
2 . The lithium metal complex oxide powder according to claim 1 ,
wherein a BET specific surface area of the lithium metal complex oxide powder is 0.1 m 2 /g or more and 2.0 m 2 /g or less.
3 . The lithium metal complex oxide powder according to claim 1 ,
wherein a 10% cumulative volume particle size D 10 of the lithium metal complex oxide powder is 4 μm or less.
4 . The lithium metal complex oxide powder according to claim 1 ,
wherein an amount of residual lithium measured by a neutralization titration method is 0.3 mass % or less.
5 . The lithium metal complex oxide powder according to claim 1 , comprising:
core particles; and
a coating material that coats a surface of the core particles,
wherein the coating material contains an element X,
where the element X is one or more elements selected from the group consisting of Al, Ti, Zr, La, Nb, and W.
6 . A positive electrode active material for lithium secondary batteries, comprising:
the lithium metal complex oxide powder according to claim 1 .
7 . A positive electrode for lithium secondary batteries, comprising:
the positive electrode active material for lithium secondary batteries according to claim 6 .
8 . A lithium secondary battery comprising:
the positive electrode for lithium secondary batteries according to claim 7 .
9 . The lithium metal complex oxide powder according to claim 2 ,
wherein a 10% cumulative volume particle size D 10 of the lithium metal complex oxide powder is 4 μm or less.
10 . The lithium metal complex oxide powder according to claim 2 ,
wherein an amount of residual lithium measured by a neutralization titration method is 0.3 mass % or less.
11 . The lithium metal complex oxide powder according to claim 2 , comprising:
core particles; and
a coating material that coats a surface of the core particles,
wherein the coating material contains an element X,
where the element X is one or more elements selected from the group consisting of Al, Ti, Zr, La, Nb, and W.
12 . A positive electrode active material for lithium secondary batteries, comprising:
the lithium metal complex oxide powder according to claim 2 .