Positive electrode active material for lithium secondary battery, method of preparing the same, positive electrode for lithium secondary battery including the same, and lithium secondary battery including the positive electrode
AssigneeSamsung SDI Co., Ltd.
InventorSeung-Beob Yi
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Abstract
A positive electrode active material for a lithium secondary battery includes a lithium cobalt complex oxide containing an alkali earth metal and a transition metal in a predetermined mixture ratio. A method of preparing the positive electrode active material includes mixing a lithium salt, a transition metal precursor, and an alkali earth metal salt to form a mixture, and performing at least one thermal treatment on the mixture. A positive electrode for a lithium secondary battery includes the positive electrode active material, and a lithium secondary battery includes the positive electrode.
Claims11
A positive electrode active material for a lithium secondary battery, the positive electrode active material comprising a material represented by Formula 1:
- LixM′yM″zCo1-y-zO2 Formula 1
- wherein, M′ is magnesium (Mg), M″ is titanium (Ti), 0.95≦x≦1.05, 0.0056≦y≦0.0081, 0.0016≦z≦0.0018, and 3.1≦y/z≦5.1, wherein the positive electrode active material comprises a concentration gradient of M′ from a surface layer to a center portion of the positive electrode active material.
Dependencies are inferred from the claim text.