JPH1160244A5 - - Google Patents

Claims (10)

It has an α-NaFeO ₂ -type crystal structure and has the general formula LiNi _x Co _y Al _z O ₂ [0.70≦x<0.85;0.05≦y≦0.20;0.10<z≦0.25; x+y+z=1.0]
In the lithium-containing composite metal oxide represented by the formula (1), the separation Δ2θ ((110)-(018)) between the peak position of the (018) plane and the peak position of the (110) plane in powder X-ray diffraction using copper Kα radiation is 0.520 to 0.7000.
3. A lithium-containing composite metal oxide. 2. The lithium-containing composite metal oxide according to claim 1, wherein the peak height ratio in an exothermic peak curve measured by DTA is 0.30 or less. In the production of a lithium-containing composite metal oxide represented by the general formula LiNi _x Co _y Al _z O ₂ [0.70≦x<0.85;0.05≦y≦0.20;0.10<z≦0.25; x+y+z=1.0], a process of adding an alkali to a mixed aqueous solution of constituent metal compounds other than Li to neutralize and co-precipitate the compound, and then washing and drying the coprecipitate and then adding LiOH, Li _2
1. A method for producing a lithium-containing composite metal oxide, comprising the steps of dry-mixing a lithium-containing composite metal oxide with a lithium compound selected from the group consisting of O and _Li2CO3 , and firing the mixture in an oxygen-containing gas stream. In the production of a lithium-containing composite metal oxide represented by the general formula LiNi _x Co _y Al _z O ₂ [0.70≦x<0.85;0.05≦y≦0.2;0.10<z≦0.25; x+y+z=1.0], the following steps are carried out: neutralizing and coprecipitating an aqueous solution containing a Ni compound and a Co compound with an aqueous solution containing an alkali metal aluminate and an alkali; washing and drying the coprecipitate, and then adding LiOH, Li _2
1. A method for producing a lithium-containing composite metal oxide, comprising the steps of dry-mixing a lithium-containing composite metal oxide with a lithium compound selected from the group consisting of O and _Li2CO3 , and firing the mixture in an oxygen-containing gas stream. 5. The method for producing a lithium-containing composite metal oxide according to claim 4, wherein the alkali metal aluminate is a Li salt, a Na salt, or a K salt. A method for producing a lithium-containing composite metal oxide represented by the general formula LiNi _x Co _y Al _z O ₂ [0.70≦x<0.85;0.05≦y≦0.20;0.10<z≦0.25; x+y+z=1.0], comprising the steps of mixing hydroxides and/or oxides of the constituent metals in a slurry form, filtering and drying the mixture, and then calcining the mixture in an oxygen-containing gas stream. In the production of a lithium-containing composite metal oxide represented by the general formula LiNi _x Co _y Al _z O ₂ [0.70≦x<0.85;0.05≦y≦0.20;0.10<z≦0.25; x+y+z=1.0], a process for mixing hydroxides and/or oxides of constituent metals other than Li in water as a solvent to form a slurry, a process for filtering and drying the resulting mixture, and a process for extracting LiOH and Li _2
1. A method for producing a lithium-containing composite metal oxide, comprising the steps of dry-mixing a lithium-containing composite metal oxide with a lithium compound selected from the group consisting of O and _Li2CO3 , and firing the mixture in an oxygen-containing gas stream. 8. The method for producing a lithium-containing composite metal oxide according to claim 3, wherein a lithium compound is separately made to coexist with the mixture in a state where the lithium compound comes into contact with the mixture only through a gas phase during firing. A positive electrode active material for a lithium secondary battery, comprising the lithium-containing composite metal oxide according to claim 1 or 2. A lithium secondary battery comprising the lithium-containing composite metal oxide according to claim 1 or 2.