| 초록 |
Mesostructured TiO2-graphitic carbon (TiO2-gC) composite was synthesized through a simple and scalable hydrothermal method to be employed as lithium storage material. In the wide voltage range (0.0-2.5V), the TiO2-gC composite possesses a high initial lithiation capacity (598 mAh/g) at 0.1C (1C: 150 mA/g), and it still retains 369 mAh/g after 50 cycles at 0.5C. Under high current density of 2C, furthermore, TiO2-gC anode exhibits stable capacity (252 mAh/g) retention up to 200 cycles. This excellent electrochemical performance could be ascribed to a synergistic effect of well-developed mesoporosity with high surface area (345.4 m2/g), conductive graphitic carbon wall, and uniformly dispersed TiO2 nanoparticles, resulting in improved Li+ penetration, fast electron transport and high structural stability during cycling.
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