| 摘要 |
A lamellar sodium-cobalt-manganese oxide represented by the general formula NaxCoyMn1-yO2 (where 0.6<=x<=0.8, 0.4<=y<=0.6) is disclosed, which is obtained by the steps of: mixing a sodium salt, a cobalt salt and a manganese salt in an aqueous solution state so as to be a molar ratio of sodium, cobalt and manganese of x: y: 1-y (where 0.6<=x<=0.8, 0.4<=y<=0.6) and drying the obtained mixture, sintering the obtained dried body in an oxygen-containing gas at 700 to 900° C., and quenching the sintered body from a temperature between 700° C. and 800° C. The lamellar sodium-cobalt manganese oxide of the present invention has a uniform composition and a single crystal structure, which is useful as an electrode active material for a lithium ion secondary battery.
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