Positive electrode active material, method of preparing the same, and lithium secondary battery including the same
The present disclosure relates to a positive electrode active material for a lithium secondary battery including lithium metal oxide particles; and a coating layer placed on at least a part of a surface of the lithium metal oxide particles, wherein the coating layer includes B, LiOH, Li 2 CO 3 , and Li 2 SO 4 .
1 . A positive electrode active material for a lithium secondary battery comprising:
lithium metal oxide particles; and
a coating layer placed on at least a part of a surface of the lithium metal oxide particles,
wherein the coating layer includes B, LiOH, Li 2 CO 3 , and Li 2 SO 4 , and
wherein a content of Li 2 SO 4 is 10 ppm to 500 ppm, based on the entire positive electrode active material.
2 . The positive electrode active material for a lithium secondary battery of claim 1 , wherein:
a content of B is 10 ppm to 5000 ppm, based on the entire positive electrode active material.
3 . The positive electrode active material for a lithium secondary battery of claim 1 , wherein:
a content of LiOH is 10 ppm to 10,000 ppm, based on the entire positive electrode active material.
4 . The positive electrode active material for a lithium secondary battery of claim 1 , wherein:
a content of Li 2 CO 3 is 1000 ppm to 5000 ppm, based on the entire positive electrode active material.
5 . The positive electrode active material for a lithium secondary battery of claim 1 , wherein:
the Li 2 CO 3 comes from an internal reaction, without introducing a lithium raw material separately.
6 . The positive electrode active material for a lithium secondary battery of claim 1 , wherein:
a content of nickel of metals in the lithium metal oxide particles is 85 mol % or more.
7 . A lithium secondary battery comprising:
a positive electrode including the positive electrode active material of claim 1 ;
a negative electrode; and
a non-aqueous electrolyte.