CPC H01M 4/366 (2013.01) [C01G 49/0027 (2013.01); C01G 49/0045 (2013.01); C01G 49/0072 (2013.01); C01G 51/42 (2013.01); C01G 53/42 (2013.01); H01M 4/0471 (2013.01); H01M 4/485 (2013.01); H01M 4/505 (2013.01); H01M 4/525 (2013.01); H01M 10/0525 (2013.01); C01P 2002/50 (2013.01); C01P 2004/03 (2013.01); C01P 2004/61 (2013.01); C01P 2004/84 (2013.01); C01P 2006/40 (2013.01); H01M 2004/021 (2013.01); H01M 2004/028 (2013.01)] | 15 Claims |
1. A composite metal oxide material used for a positive electrode of a secondary battery, wherein the composite metal oxide material is in a form of a particle and comprises:
a central core, wherein the central core comprises a material having a chemical formula of Li5FexM1−xO4, wherein 0.6≤x<1; and
a coating layer on a surface of the central core, wherein the coating layer comprises a material having a chemical formula of LiMO2; and,
wherein M is one or more metal elements different from Fe and with +3 valence, and an absolute value of the difference between +3-valence ion radius of Fe and +3-valence ion radius of M is ≤0.02 nm.
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