Optimized precursor temperature of LiNi0.4 Co0.2Mn0.4O2 cathode materials by ultrasonic spray pyrolysis method

Abstract

Recently, various attempts have been made to enhance the electrochemical performance of LiNiO2-LiCoO2-LiMnO2 solid solution. Among them, LiNi1/3Co1/3Mn1/3O2 has been suggested as an alternative to LiCoO2 because Ni and Mn can substitute each other to form a solid solution of any percentage without disturbing the layer structure. Dahn et al. reported that Li[NixCo1-2xMnx]O2 (x in 1/4, 3/8) materials can delivered a discharge capacity of 160 mAh/g when cycled between 2.5 V and 4.4 V. In this work, we synthesized of LiNi0.4Co0.2Mn0.4O2 layered materials with various synthesise temperature by a spray pyrolysis method. The LiNi0.4Co0.2Mn0.4O2 materials are considered to be a solid solution of LiNiO2, LiMnO2, and LiCoO2. We investigate on structural properties and electrochemical performance of LiNi0.4Co0.2Mn0.4O2 materials. This materials shows that the initial capacity is over 180 mAh/g with excellent cyclability in the 2.4-4.4 V range.