LITHIUM METAL COMPOSITE OXIDE, POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERIES, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERIES, AND LITHIUM SECONDARY BATTERY

1 . A lithium metal composite oxide having a layered structure, comprising at least:

Li;

Ni; and

an element X,

wherein the element X is one or more elements selected from the group consisting of Co, Mn, Fe, Cu, Ti, Mg, Al, B, W, Mo, Nb, Zn, Sn, Zr, Ga, La, and V, and

characteristic values obtained from adsorption isotherm measurement of nitrogen gas obtained by a gas adsorption method satisfy (1) and (2),

(1): a total pore volume V obtained from an amount of nitrogen adsorbed when a relative pressure (p/p0) is 0.99 on an adsorption isotherm of the nitrogen gas satisfies 0.005 cm 3 /g or less, and

(2): a value of formula (A) satisfies 0.18 or more,

S /( V× 1000)  Formula (A)

(in the formula (A), S is a specific surface area (unit: m 2 /g) of the lithium metal composite oxide obtained from a BET method, and V is a total pore volume (unit: cm 3 /g) of the lithium metal composite oxide obtained from an amount of nitrogen adsorbed at a relative pressure of 0.99 on the adsorption isotherm).

2 . The lithium metal composite oxide according to claim 1 ,

wherein formula (I) is satisfied,

Li[Li x (Ni (1-y-z-w) Co y Mn z M w ) 1-x ]O 2   (I)

(here, −0.1≤x≤0.2, 0≤y≤0.4, 0≤z≤0.4, 0≤w≤0.1, y+z+w≤1, and M represents 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).

3 . The lithium metal composite oxide according to claim 1 ,

wherein an average particle diameter D 50 , which is a 50% cumulative diameter obtained from particle size distribution measurement, satisfies 1 μm or more and 10 μm or less.

4 . The lithium metal composite oxide according to claim 1 ,

wherein, in the adsorption isotherm measurement of the nitrogen gas and the desorption isotherm measured subsequent to an adsorption isotherm, an area of a region formed between the adsorption isotherm and the desorption isotherm in a range where p/p0, which is the relative pressure, is 0.5 or more and 0.9 or less satisfies 0.02 cm 3 /g or less.

5 . The lithium metal composite oxide according to claim 1 ,

wherein, in pore distribution obtained from the adsorption isotherm measurement of the nitrogen gas, a log differential pore volume has a maximum value in a region of pore sizes of 200 nm or less, and

the maximum value satisfies 0.03 cm 3 /(g·nm) or less.

6 . The lithium metal composite oxide according to claim 1 ,

wherein the S satisfies 0.1 m 2 /g or more and 1.5 m 2 /g or less.

7 . The lithium metal composite oxide according to claim 1 ,

wherein a tapped density satisfies 1.2 g/cm 3 or more and 2.5 g/cm 3 or less.

8 . A positive electrode active material for a lithium secondary battery, comprising:

the lithium metal composite oxide according to claim 1 .

9 . A positive electrode for a lithium secondary battery, comprising:

the positive electrode active material for a lithium secondary battery according to claim 8 .

10 . A lithium secondary battery comprising:

the positive electrode for a lithium secondary battery according to claim 9 .

11 . The lithium metal composite oxide according to claim 2 ,

wherein an average particle diameter D 50 , which is a 50% cumulative diameter obtained from particle size distribution measurement, satisfies 1 μm or more and 10 μm or less.

12 . The lithium metal composite oxide according to claim 2 ,

wherein, in the adsorption isotherm measurement of the nitrogen gas and the desorption isotherm measured subsequent to an adsorption isotherm, an area of a region formed between the adsorption isotherm and the desorption isotherm in a range where p/p0, which is the relative pressure, is 0.5 or more and 0.9 or less satisfies 0.02 cm 3 /g or less.

13 . The lithium metal composite oxide according to any claim 2 ,

wherein, in pore distribution obtained from the adsorption isotherm measurement of the nitrogen gas, a log differential pore volume has a maximum value in a region of pore sizes of 200 nm or less, and

the maximum value satisfies 0.03 cm 3 /(g·nm) or less.

14 . The lithium metal composite oxide according to claim 2 ,

wherein the S satisfies 0.1 m 2 /g or more and 1.5 m 2 /g or less.

15 . The lithium metal composite oxide according to claim 2 ,

wherein a tapped density satisfies 1.2 g/cm 3 or more and 2.5 g/cm 3 or less.

16 . A positive electrode active material for a lithium secondary battery, comprising:

the lithium metal composite oxide according to claim 2 .