POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION BATTERY, CONTAINING LITHIUM VANADIUM ZIRCONIUM PHOSPHATE, AND LITHIUM ION BATTERY COMPRISING SAME

摘要

The present invention relates to a positive electrode active material for a lithium ion battery and, more specifically, to a positive electrode active material for a lithium ion battery, having improved initial capacitance and charging and discharging efficiency due to increased electrical conductivity or ion conductivity. The positive electrode active material for a lithium ion battery of the present invention contains lithium vanadium phosphate (Li₃V₂(PO₄)₃) and lithium zirconium phosphate (Li₃Zr₂(PO₄)₃) formed on an external surface of the lithium vanadium phosphate. The positive electrode active material for a lithium ion battery comprising lithium vanadium zirconium phosphate (Li₃V_2-xZr_x(PO₄)₃) particles, which is prepared by a preparation method of the present invention, has excellent structural stability and ion conductivity as well as high capacitance.