| 摘要 |
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).
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