Composite cathode active material, cathode and lithium battery containing the material and method of preparing the same
AssigneeSamsung SDI Co., Ltd.
InventorsMyung-Hun Bae, Naoyuki Hase
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Abstract
A composite cathode active material, a cathode including the composite cathode active material, and a lithium battery including the cathode. The composite cathode active material includes: a lithium transition metal oxide; and a lithium-containing impurity on a surface of the lithium transition metal oxide. The lithium-containing impurity includes free lithium in an amount of about 0.050 wt % or less based on a total weight of the composite cathode active material, and LiOH and Li2CO3 in a mole ratio of LiOH to Li2CO3 of about 0.50 or less.
Claims20
A composite cathode active material comprising:
- a lithium transition metal oxide;
- and
- a lithium-containing impurity on a surface of the lithium transition metal oxide,
- wherein:
- the lithium-containing impurity comprises free lithium in an amount of about 0.050 wt % or less based on a total weight of the composite cathode active material, and
- the lithium-containing impurity comprises LiOH and Li2CO3, and a mole ratio of LiOH to Li2CO3 is about 0.50 or less.
A method of preparing a composite cathode active material, the method comprising:
- mixing precursors of a lithium transition metal oxide together to prepare a mixture;
- and
- calcining the mixture in an oxygen atmosphere at a temperature of about 950° C. or higher to obtain a calcined product;
- and
- preparing the composite cathode active material from the calcined product, the prepared composite cathode active material comprising a lithium-containing impurity,
- the lithium-containing impurity comprising free lithium in an amount of about 0.050 wt % or less based on a total weight of the composite cathode active material, and
- the lithium-containing impurity comprising LiOH and Li2CO3 and a mole ratio of LiOH to Li2CO3 is about 0.50 or less.
Dependencies are inferred from the claim text.