Novel High-rate Lithium Intercalation Electrode Materials Prepared by LiOH Solution Treatment of TiO{sub}2/Carbon Composites

摘要

Anatase-type TiO{sub}2-based oxide gel/carbon composites were treated chemically with LiOH aqueous solution at 60°C. The crystalline phase of treated powder was examined by powder x-ray diffraction using CuKα radiation. The main diffraction peaks may be detected as belonging to cubic LiTiO{sub}2 High-rate lithium intercalation properties of the samples were estimated in nonaqueous electrolyte including lithium ions. The composite electrodes exhibited high coulombic efficiency over 90% at first cycle and high capacities over 200 mAh g{sup}(-1) after 200 cycle at large charge-discharge current density of 5.0 mA cm{sup}(-2) (3.7 A g{sup}(-1)). The composite materials are one of the promising candidates as electrode materials for energy storage devices, such as hybrid capacitor, that require high-power operations.