Novel High-Rate Lithium Intercalation Electrode Materials Prepared by LiOH Solution Treatment of TiO₂/Carbon Composites

Anatase-type TiO2-based oxide gel /carbon composites were treated chemically with LiOH aqueous solution at 60 ºC. 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 LiTiO2. 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-1 after 200 cycle at large charge-discharge current density of 5.0 mA cm-2 (3.7 A g-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.