양극산화법으로 제조된 TiO2 지지체를 이용한 Li-S 전지 제조 및 전기화학적 특성 연구
v, 46 p.
Li S TiO2 양극산화 전지;
- 원문 URL
Lithium sulfur battery is advantageous with a high theoretical capacity (1675 mAh/g), a high energy density (2600 Wh/kg) and relatively low cost. So now, a lot of researches have been performed. Despite its promises, various problems such as low active material utilization, significant capacity decay over cycling still hinds the commercialization of lithium sulfur batteries. Moreover, the volume change during the charge and discharge process and low electrical conductivity of sulfur (5 x 10-30 S/cm, 25 °C) lead to poor rate capability and short life time. Most sever problem is resulted from the dissolution of lithium poly sulfides in liquid electrolyte, which bring about active mass loss and capacity fading. In addition, the soluble poly sulfides immigrate between cathode and anode to form a so-call shuttle phenomenon, drawing corrosion of anode and generate safety issues. In this work, self-standing TiO2 nanotube was fabricated by anodic oxidation method which has simple process of manufacturing and can get nanotube with excellent adhesion and porosity. Sulfur was impregnated into the TiO2 nanotube and thus formed S/TiO2 composite was used as cathode material in lithium sulfur batteries. The products were analyzed by field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS) and thermogravimetric Analyzer (TGA). The electrochemical performance of Li-S cells with S/TiO2 composite was evaluated using coin cell.