METHOD FOR PRODUCING LITHIUM METAL COMPOSITE OXIDE
A method for producing a lithium metal composite oxide, including a calcining step of introducing a gas mixture inside a calcining furnace and calcining a substance to be calcined in the calcining furnace at a temperature of higher than 600° C., in which the substance to be calcined is a raw material mixture containing a mixture of a metal composite compound and a lithium compound or a reaction product of the metal composite compound and the lithium compound, the gas mixture before introduction contains oxygen, an amount of moisture in the gas mixture is 8 vol % or more and 85 vol % or less, and an amount of carbon dioxide in the gas mixture is less than 4 vol %.
1 . A method for producing a lithium metal composite oxide, comprising a calcining step of introducing a gas mixture inside a calcining furnace and calcining a substance to be calcined in the calcining furnace at a temperature of higher than 600° C.,
wherein the substance to be calcined is a raw material mixture containing a mixture of a metal composite compound and a lithium compound or a reaction product of the metal composite compound and the lithium compound,
the gas mixture before introduction contains oxygen,
an amount of moisture in the gas mixture is 8 vol % or more and 85 vol % or less, and
an amount of carbon dioxide in the gas mixture is less than 4 vol %.
2 . The method for producing the lithium metal composite oxide according to claim 1 ,
wherein an amount of oxygen in the gas mixture before introduction is 10 vol % or more and 92 vol % or less.
3 . The method for producing the lithium metal composite oxide according to claim 1 ,
wherein a total amount of moisture (m 3 ) introduced into the calcining furnace with respect to a charged powder mass (kg) of the substance to be calcined is 0.1 m 3 /kg or more and 20 m 3 /kg or less.
4 . The method for producing the lithium metal composite oxide according to claim 1 ,
wherein a calcining time in the calcining step is 1 hour or longer and 24 hours or shorter.
5 . The method for producing the lithium metal composite oxide according to claim 1 , comprising a cooling step of cooling a calcined product inside the calcining furnace after the calcining step,
wherein a gas with a dew point of −15° C. or lower is supplied inside the calcining furnace in the cooling step.
6 . The method for producing the lithium metal composite oxide according to claim 1 ,
wherein the lithium metal composite oxide satisfies General Formula (I) below,
Li[Li x (Ni (1-y-z) Co y X z ) 1-x ]O 2 (I)
(in Formula (I), X represents one or more elements selected from the group consisting of Mn, Fe, Cu, Ti, Mg, Al, W, Mo, Nb, Zn, Sn, Zr, Ga, B, Si, S, and P, and −0.1≤x≤0.2, 0≤y≤0.4, and 0≤z≤0.5 are satisfied.)
7 . The method for producing the lithium metal composite oxide according to claim 2 ,
wherein a total amount of moisture (m 3 ) introduced into the calcining furnace with respect to a charged powder mass (kg) of the substance to be calcined is 0.1 m 3 /kg or more and 20 m 3 /kg or less.
8 . The method for producing the lithium metal composite oxide according to claim 2 ,
wherein a calcining time in the calcining step is 1 hour or longer and 24 hours or shorter.
9 . The method for producing the lithium metal composite oxide according to claim 2 , comprising a cooling step of cooling a calcined product inside the calcining furnace after the calcining step,
wherein a gas with a dew point of −15° C. or lower is supplied inside the calcining furnace in the cooling step.
10 . The method for producing the lithium metal composite oxide according to claim 2 ,
wherein the lithium metal composite oxide satisfies General Formula (I) below,
Li[Li x (Ni (1-y-z) Co y X z ) 1-x ]O 2 (I)
(in Formula (I), X represents one or more elements selected from the group consisting of Mn, Fe, Cu, Ti, Mg, Al, W, Mo, Nb, Zn, Sn, Zr, Ga, B, Si, S, and P, and −0.1≤x≤0.2, 0≤y≤0.4, and 0≤z≤0.5 are satisfied.)