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Abstract

A method for forming a positive electrode active material that can be used for a lithium ion battery having excellent discharge characteristics even in a low-temperature environment is provided. The method includes a first step in which lithium cobalt oxide with a median diameter (D50) of less than or equal to 10 μm is heated at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C. for longer than or equal to 1 hour and shorter than or equal to 5 hours, a second step in which a first mixture is formed by mixing a fluorine source and a magnesium source to the lithium cobalt oxide subjected to the first step, a third step in which the first mixture is heated at a temperature higher than or equal to 800° C. and lower than or equal to 1100° C. for longer than or equal to 1 hour and shorter than or equal to 10 hours, a fourth step in which a second mixture is formed by mixing a nickel source and an aluminum source to the first mixture subjected to the third step, and a fifth step in which the second mixture is heated at a temperature higher than or equal to 800° C. and lower than or equal to 950° C. for longer than or equal to 1 hour and shorter than or equal to 5 hours.

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First Claim