Cobalt-coated lithium manganese complex oxide and preparation process thereof
AssigneeToda Kogyo Corporation
InventorsShoichi Fujino, Hiroshi Takahama, Mitsuaki Hatatani, Norimiki Sugiyama, Hideaki Sadamura
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Abstract
A cobalt-coated lithium manganese complex oxide is disclosed. This provides a particularly high discharge capacity which is useful for the improvement of cycle characteristics of a secondary battery as an active material of a positive electrode for a secondary battery with a nonaqueous electrolyte.
Claims7
A cobalt-coated lithium manganese complex oxide, wherein the coating amount of cobalt (Z wt %) in relation to a BET specific surface area (S m2/g) of the lithium manganese complex oxide is within the range expressed by the following equation (1):
- 0.05×S≦Z≦1.50×S (1).
A process for preparing a cobalt-coated lithium manganese complex oxide, comprising the steps of:
- oxidizing lithium manganese complex oxide particles dispersed in an aqueous alkali solution and a cobalt compound at a temperature of 20 to 100° C. so that a cobalt oxide epitaxially grows on the lithium magnesium complex oxide, and
- collecting the resulting oxide after filtration, washing and drying.
Dependencies are inferred from the claim text.