Cathode active material for lithium secondary battery, lithium secondary battery and method of manufacturing the same
AssigneeSK Innovation Co., Ltd.
InventorsJi Hoon CHOI, Sang Bok KIM, Jik Soo KIM, Hee Jun KWEON, Sung Soon PARK
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Abstract
A cathode active material for a lithium secondary battery of embodiments of the present invention includes a lithium composite oxide, a first coating part formed on a surface of the lithium composite oxide and containing aluminum, and a second coating part formed on the first coating part and containing boron. Thereby, stability and electrical characteristics of the secondary battery may be improved.
Claims23
A cathode active material for a lithium secondary battery comprising:
- a lithium composite oxide;
- a first coating part formed on a surface of the lithium composite oxide and containing aluminum;
- and
- a second coating part formed on the first coating part and containing boron,
- each of the highest intensity and the lowest intensity of an aluminum peak in an Energy Dispersive X-ray Spectroscopy (EDS) spectrum has a deviation of less than 20% based on an average intensity.
The cathode active material for a lithium secondary battery according to clam 5, wherein the intermediate part has a tendency that a content of aluminum is decreased and a content of boron is increased from the first coating part side to the second coating part side.
A method of manufacturing a cathode active material for a lithium secondary battery comprising:
- forming a preliminary cathode active material including an aluminum-containing coating part by wet coating a lithium composite oxide with an aluminum source;
- and
- forming a boron-containing coating part on the aluminum-containing coating part by dry reacting the preliminary cathode active material with a boron source.
The method of manufacturing a cathode active material for a lithium secondary battery according to 16, wherein the wet coating comprises mixing the lithium composite oxide with an aluminum source solution in which a water-soluble aluminum source is dissolved, and then drying the same.
Dependencies are inferred from the claim text.