Cathode active material and Preparation method, Lithium secondary battery and Preparation method

摘要

PURPOSE: A positive electrode active material is provided to enhance the durability of LiCoO2 at high voltage and to improve available energy capacity and lifetime property by coating vanadium oxides on the surface of LiCoO2. CONSTITUTION: A positive electrode active material is able to absorbing and discharging lithium ions and is coated with vanadium oxide on the surface of LiCoO2. A method for preparing the positive electrode active material comprises the steps of: (a) preparing a sol of vanadium oxide; and (b) applying the vanadium oxide sol on the surface of LiCoO2.