Positive active material, method for manufacturing same and lithium secondary battery comprising positive electrode comprising positive active material
AssigneeSm Lab Co., Ltd.
InventorsMin Ho SEO, Ji Young KIM
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Abstract
Provided are a cathode active material, a method of preparing the same, and a lithium secondary battery including a cathode including the cathode active material, the cathode active material including a lithium transition metal oxide particle in which part of Li is substituted with Na and which includes a first region and a second region, wherein the first region includes an element other than a Co element, the second region includes the Co element, and the second region includes a concentration gradient region in which a concentration of Co atoms changes.
Claims20
A cathode active material comprising:
- a lithium transition metal oxide particle in which part of Li is substituted with Na and which comprises a first region and a second region,
- wherein the first region comprises an element other than a Co element, the second region comprises the Co element, and
- the second region comprises a concentration gradient region in which a concentration of Co atoms changes.
A method of preparing a cathode active material, the method comprising:
- preparing a precursor compound in which part of Li is substituted with Na and which comprises an element other than a Co element;
- heat-treating the precursor compound to obtain Co-free lithium transition metal oxide particles;
- mixing the Co-free lithium transition metal oxide particles and a Co element-containing compound to obtain a cathode active material precursor;
- and
- firing the cathode active material precursor to obtain a cathode active material.
Dependencies are inferred from the claim text.