CATHODE ACTIVE MATERIAL COATED WITH FLUORINE-DOPED LITHIUM METAL MANGANESE OXIDE AND LITHIUM-ION SECONDARY BATTERY COMPRISING THE SAME

摘要

Provided are a cathode active material coated with a fluorine-doped spinel-structured lithium metal manganese oxide, a lithium secondary battery including the same, and a method for preparing the same. The cathode active material has improved chemical stability and provides improved charge/discharge characteristics at elevated temperature (55-60° C.) and high rate. The cathode active material allows lithium ions to pass through the coating layer with ease and is chemically stable, and thus may be used effectively as a cathode active material for a high-power lithium secondary battery.

主权项

1. A cathode active material having a core-shell structure, wherein the shell is a coating layer of fluorine-doped spinel-structured lithium metal manganese oxide represented by the following Chemical Formula 1:
Li1MxMn2-xO4-nFn  [Chemical Formula 1] wherein x is 1/(4−z), z is an oxidation number of M, and n is a real number satisfying 0