Chemistry Letters, Vol.30, No.11, 1114-1115, 2001
Cobalt doped orthorhombic LiMnO2 as cathode materials for lithium-ion batteries
Orthorhombic type LiCoxMn1-xO2 (0 less than or equal to x less than or equal to 0.14) oxides have been synthesized by hydrothermal treatment of (CoxMn1-x)(3)O-4 precursors and LiOH aqueous solution at 170 degreesC. As-synthesized powders showed well-ordered beta -NaMnO2 structures, and the products were single crystalline particle oxides from TEM observations. The particle size decreased with increasing the amount of Co substituent. Much more improved capacity upon 100 cycling was clearly seen in orthorhombic LiCo0.1Mn0.9O2, comparing to orthorhombic LiMnO2,