2009 年 34 巻 1 号 p. 129-132
LiMn0.9M0.1O2 (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 LiMn0.9Cu0.1O2 powders was found to be 220 mAh/g after 15 recharge cycles at the charging rate of 0.01C.