Lithium-containing complex metal oxide, preparation methods thereof, and cathode electroactive material using the same and lithium secondary cells
AssigneeShowa Denko K.K.
InventorsYasushi Matsui, Masatoshi Shirao
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Abstract
A lithium-containing complex metal oxide having a crystal structure of α-NaFeO2 type and represented by a general formula: LiaNiXCoYAlZO2 wherein 0.96≦a≦1.06, 0.70≦X<0.85, 0.05≦Y≦0.20, 0.10<Z≦0.25, and 0.98≦(X+Y+Z)≦1.02, and further wherein a separation between a peak position of (018) face and a peak position of (110) face in the powder X-ray diffraction pattern of said metal oxide using CuKα-ray is in the range of from 0.520 to 0.700° as expressed in terms of Δ2θ((110)-(018)).
Claims10
A method for preparing a lithium-containing complex metal oxide represented by a general formula:
- LiaNiXCoYAlZO2
- wherein 0.96≦a≦1.06, 0.70≦X<0.85, 0.05≦Y≦0.20, 0.10<Z≦0.25, and 0.98≦(X+Y+Z)≦1.02,
- said method comprising the steps of:
- neutralizing a mixed aqueous solution containing a Ni compound, a Co compound, and an Al compound to obtain a coprecipitation product;
- washing and drying the coprecipitation product, and blending the coprecipitation product with at least one lithium compound selected from the group consisting of LiOH, Li2O, and Li2CO3 to obtain a blend;
- and
- burning the blend in an oxygen-containing stream to obtain said lithium-containing complex metal oxide.
A method for preparing a lithium-containing complex metal oxide represented by a general formula:
- LiaNiXCoYAlZO2
- wherein 0.96≦a≦1.06, 0.70≦X<0.85, 0.05≦Y≦0.20, 0.10<Z≦0.25, and 0.98≦(X+Y+Z)≦1.02,
- said method comprising the steps of:
- blending at least one compound selected from the group consisting of lithium hydroxide and lithium oxide, at least one compound selected from the group consisting of a nickel hydroxide and a nickel oxide, at least one compound selected from the group consisting of a cobalt hydroxide and a cobalt oxide, at least one compound selected from the group consisting of aluminum hydroxide and aluminum oxide, and a solvent to prepare slurry containing the foregoing compounds;
- filtering blended solids from the slurry, drying the blended solids, and burning the blended solids in an oxygen-containing stream after filtration and drying to obtain said lithium-containing complex metal oxide.
A method for preparing a lithium-containing complex metal oxide represented by the general formula:
- LiaNiXCoYAlZO2
- wherein 0.96≦a≦1.06, 0.70≦X<0.85, 0.05≦Y≦0.20, 0.10<Z≦0.25, and 0.98≦(X+Y+Z)≦1.02,
- said method comprising the steps of:
- blending at least one compound selected from the group consisting of a nickel hydroxide and a nickel oxide, at least one compound selected from the group consisting of a cobalt hydroxide and a cobalt oxide, at least one compound selected from the group consisting of aluminum hydroxide and aluminum oxide, and water as solvent to prepare slurry containing the foregoing compounds;
- filtering blended solids from the slurry, drying the blended solids, and dry blending the blended solids with at least one lithium compound selected from the group consisting of LiOH, Li2O and Li2CO3 to obtain a blend;
- and
- burning the blend in an oxygen-containing stream to obtain said lithium-containing complex metal oxide.
Dependencies are inferred from the claim text.