CPC H01M 4/525 (2013.01) [C01G 53/50 (2013.01); H01B 1/08 (2013.01); H01M 4/131 (2013.01); H01M 4/133 (2013.01); H01M 4/134 (2013.01); H01M 4/139 (2013.01); H01M 4/366 (2013.01); H01M 4/505 (2013.01); H01M 6/164 (2013.01); H01M 10/0525 (2013.01); C01P 2002/74 (2013.01); H01M 2004/028 (2013.01)] | 49 Claims |
1. A method for manufacturing a lithium-ion secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, the positive electrode comprising a positive electrode active material, the positive electrode active material comprising a positive electrode active material particle, the method comprising the steps of:
mixing a lithium source, a cobalt source, a magnesium source, and a fluorine source to form a mixture;
performing a first heating on the mixture to form a composite oxide; and
performing a second heating on the composite oxide so that magnesium of the magnesium source is segregated at a surface portion of the positive electrode active material particle,
wherein a temperature of the second heating is lower than a temperature of the first heating, and
wherein the mixture comprises a magnesium compound and a compound comprising lithium and fluorine.
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