Synthesis and Electrochemical properties of Layered Type LiMnO₂ Powders by Spray Pyrolysis

Abstract

LiMn_0.9M_0.1O₂ (M=Mn, Ni, Zn, Cu) precursor powders were successfully prepared by ultrasonic spray pyrolysis. The main crystal phases of the powders calcined at 800 ℃ in argon atmosphere were found to exhibit orthorhombic structure. These powders showed a spherical morphology with the average particle size of 1.4 μm. The results of electrochemical measurements revealed that the discharge capacity of LiMnO₂ increases by doping foreign metal such as Cu, Ni, and Zn. The discharge capacity of LiMn_0.9Cu_0.1O₂ powders was found to be 220 mAh/g after 15 recharge cycles at the charging rate of 0.01C.