LITHIUM TRANSITION METAL COMPLEX OXIDE FOR LITHIUM ION SECONDARY BATTERY POSITIVE ELECTRODE ACTIVE MATERIAL, PRODUCING METHOD OF LITHIUM TRANSITION METAL COMPLEX OXIDE, POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

摘要

A lithium transition metal composite oxide, a method for preparing the oxide, a cathode active material containing the oxide, and a lithium ion secondary battery containing the cathode active material are provided to improve battery performance and to suppress the fixation of a sintering powder to a sintering container. A lithium transition metal composite oxide contains 100-1,000 ppm of Si; and 300-900 ppm of F. The lithium transition metal composite oxide is prepared by mixing a lithium compound, a transition metal compound, a fluorine compound and a silicon compound; and sintering the obtained mixture. Preferably the fluorine compound is at least one selected from LiF, CaF2, MgF2, CoF2 and AlF3; and the silicon compound is SiOx or MySiOz, wherein 1=x=2; M is at least one selected from Li, H, Co, Ni, Mn, Mg and Al; 0y=4; and 2z=4.