POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY
A positive electrode active material for a lithium secondary battery, contains a lithium metal composite oxide and barium sulfate, in which the lithium metal composite oxide is represented by Formula (1). (in Formula (1), M1 is at least one element of Co, Mn, or Al, M2 is at least one element of Ti, Zn, Zr, Mg, Ca, B, Si, Nb, W, Mo, Ta, or P, and Formula (1) satisfies −0.1≤a≤0.2, 0<b≤0.4, 0≤c≤0.4, and 0<b+c≤0.4)
1 . A positive electrode active material for a lithium secondary battery, comprising:
a lithium metal composite oxide; and
barium sulfate,
wherein the lithium metal composite oxide is represented by Formula (1),
(in Formula (1), M1 is at least one element of Co, Mn, or Al, M2 is at least one element of Ti, Zn, Zr, Mg, Ca, B, Si, Nb, W, Mo, Ta, or P, and Formula (1) satisfies −0.1≤a≤0.2, 0<b≤0.4, 0≤c≤0.4, and 0<b+c≤0.4).
2 . The positive electrode active material for a lithium secondary battery according to claim 1 ,
wherein a total amount of substance of the barium sulfate with respect to a total amount of substance of the positive electrode active material for a lithium secondary battery is 0.01 mol % or more and 3.0 mol % or less.
3 . The positive electrode active material for a lithium secondary battery according to claim 1 ,
wherein a BET specific surface area of the positive electrode active material for a lithium secondary battery is 2.0 m 2 /g or less.
4 . The positive electrode active material for a lithium secondary battery according to claim 1 ,
wherein (B/A) which is an average particle diameter B of the barium sulfate with respect to an average particle diameter A of the lithium metal composite oxide is 1.0 or less.
5 . The positive electrode active material for a lithium secondary battery according to claim 1 ,
wherein a pH of a liquid obtained by mixing and filtering the positive electrode active material for a lithium secondary battery and water at a mass ratio of 1:1 at 25° C. is 12.5 or less.
6 . A positive electrode for a lithium secondary battery, comprising:
the positive electrode active material for a lithium secondary battery according to claim 1 .
7 . A lithium secondary battery comprising:
the positive electrode for a lithium secondary battery according to claim 6 .
8 . The positive electrode active material for a lithium secondary battery according to claim 2 ,
wherein a BET specific surface area of the positive electrode active material for a lithium secondary battery is 2.0 m 2 /g or less.
9 . The positive electrode active material for a lithium secondary battery according to claim 2 ,
wherein (B/A) which is an average particle diameter B of the barium sulfate with respect to an average particle diameter A of the lithium metal composite oxide is 1.0 or less.
10 . The positive electrode active material for a lithium secondary battery according to claim 2 ,
wherein a pH of a liquid obtained by mixing and filtering the positive electrode active material for a lithium secondary battery and water at a mass ratio of 1:1 at 25° C. is 12.5 or less.
11 . A positive electrode for a lithium secondary battery, comprising:
the positive electrode active material for a lithium secondary battery according to claim 2 .
12 . A lithium secondary battery comprising:
the positive electrode for a lithium secondary battery according to claim 11 .