Method for producing lithium-containing composite oxide and non-aqueous secondary battery
AssigneePanasonic Corporation
InventorKozo WATANABE
Life of this patent
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Abstract
A method for producing a lithium-containing composite oxide represented by General Formula (1): LixMyMe1−yO2+δ (1) where M represents at least one element selected from the group consisting of Ni, Co and Mn, Me represents a metal element that is different from M, 0.95≦x≦1.10 and 0.1≦y≦1. A lithium compound and a compound that contains M and Me are baked. The thus-obtained baked product is washed with a washing solution that contains one or more water-soluble polar aprotic solvents such as N-methyl-2-pyrrolidone (NMP), N,N′-dimethylimidazolidinone (DMI) and dimethylsulfoxide (DMSO).
Claims12
A method for producing a lithium-containing composite oxide represented by General Formula (1):
- LixMyMe1−yO2+δ (1)
- where M represents at least one element selected from the group consisting of Ni, Co and Mn, Me represents a metal element that is different from M, δ represents a deficit or excess of oxygen, 0.95≦x≦1.10 and 0.1≦y≦1, the method comprising the steps of:
- baking a lithium compound and a compound that contains M and Me to obtain a baked product;
- and
- washing said baked product with a washing solution that contains one or more water-soluble polar aprotic solvents selected from the group consisting of water-soluble polar aprotic solvents represented by the following General Formulas (2) to (8):
- where R1 and R2 each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, or R1 and R2 are bonded to each other and represent an alkylene group having 3 to 6 carbon atoms that forms a ring with a nitrogen atom;
- R3 represents an alkyl group having 1 to 3 carbon atoms or a cycloalkyl group having 4 to 7 carbon atoms;
- R4 and R5 each independently represent a methyl group or an ethyl group;
- R6 and R7 each independently represent a methyl group or an ethyl group, or R6 and R7 are bonded to each other and represent an alkylene group having 2 to 4 carbon atoms that forms a ring with two nitrogen atoms and a carbonyl carbon;
- R8 and R9 each independently represent a methyl group or an ethyl group, or R8 and R9 are bonded to each other and represent an alkylene group having 4 to 6 carbon atoms that forms a ring with a sulfur element;
- R10 and R11 each independently represent a hydrogen atom, a methyl group or an ethyl group;
- R12 represents an alkyl group having 1 to 3 carbon atoms;
- R13 represents an alkylene group having 2 to 4 carbon atoms;
- Z represents an oxygen atom or a methylene group, and m and n each independently represent an integer from 1 to 3.
A method for producing a lithium-containing composite oxide represented by General Formula (1):
- LixMyMe1−yO2+δ (1)
- where M represents at least one element selected from the group consisting of Ni, Co and Mn, Me represents a metal element that is different from M, δ represents a deficit or excess of oxygen, 0.95≦x≦1.10 and the method comprising the steps of:
- baking a lithium compound and a compound that contains M and Me to obtain a baked product;
- and
- washing said baked product with a washing solution that contains a water-soluble polar aprotic solvent,
- wherein when said washing step comprises a plurality of washing steps, where a number of repetitions of said washing step is defined as n, where n is an integer equal to or greater than 2,
- said washing step comprises:
- a first washing step of washing said baked product obtained in said baking step with a first washing solution that comprises a solvent mixture of water and a water-soluble polar aprotic solvent;
- and
- an nth washing step of washing said baked product that has been washed in an (n−1)th washing step with an nth washing solution that comprises a solvent mixture of water and a water-soluble polar aprotic solvent or that comprises only a water-soluble polar aprotic solvent, and
- the water-soluble polar aprotic solvent content of said nth washing solution is higher than the water-soluble polar aprotic solvent content of an (n−1)th washing solution.
Dependencies are inferred from the claim text.