Synthesis and Electrochemical properties of Layered Type LiMnO_2 Powders by Spray Pyrolysis

LiMn_<0.9>M_<0.1>O_2(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 averag particle size of 1.4 μm. The results of electrochemical measurements revealed that the discharge capacity of LiMnO_2 increases by doping a foreign metal such as Cu, Ni, and Zn. The discharge capacity of LiMn_<0.9>Cu_<0.1>O_2 powders was found to be 220 mAh/g after 15 recharge cycles at the charging rate of 0.01C