Positive electrode active material for lithium secondary battery, method of preparing the same and lithium secondary battery including the same

  • US 10,998,548 B2
  • Filed: 10/02/2015
  • Issued: 05/04/2021
  • Est. Priority Date: 10/02/2014
  • Status: Active Grant
First Claim
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1. A method of preparing a positive electrode active material for a lithium secondary battery including lithium cobalt oxide particles having a core-shell structure comprising a core part and a shell part provided on a surface of the core part, the method comprising:

  • preparing initial lithium cobalt oxide particles by mixing a first amount of a cobalt raw material and a first amount of a lithium raw material in amounts satisfying a molar ratio of 1≤

    Li/Co≤

    1.2, and first heating under an air or oxygen atmosphere, so that a surface of the initial lithium cobalt oxide particles is exposed to the air or oxygen atmosphere during the first heating; and

    preparing the lithium cobalt oxide particles by second heating the initial lithium cobalt oxide particles to produce the shell part comprising the lithium deficient lithium cobalt oxide having the Li/Co molar ratio of less than 1, belonging to an Fd-3m space group and having a cubic crystal structure, wherein the second heating is conducted more than once,wherein the second heating is conducted under an air or oxygen atmosphere, so that the surface of the initial lithium cobalt oxide particles is exposed to the air or oxygen atmosphere during the second heating,wherein the second heating can comprise;

    further adding a raw material consisting of a second amount of the cobalt raw material, a second amount of the lithium raw material, or a combination therein, andwherein, when the second heating comprises further adding the raw material, the raw material is added in amounts satisfying a molar ratio of 0≤

    Li/Co<

    1.

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