The Effect of a Metal-Oxide Coating on the Cycling Behavior at 55°C in Orthorhombic LiMnO[sub 2] Cathode Materials

The structural stability of metal-oxide-coated orthorhombic was characterized by its 55°C cycling behavior. Sol-gel coating of the metal oxides and CoO), followed by heat-treatment at 400°C, leads to the formation of the solid-solution layer with a concentration gradient of metal atoms at the particle surface. The specific capacity and cycle life at 55°C are influenced significantly by the metal-oxide coating. CoO-coated exhibits an additional voltage plateau at the deep discharge (2 V), and has a higher capacity than -coated electrode, although the capacity retention is inferior to the -coated cathode. © 2002 The Electrochemical Society. All rights reserved.