| 초록 |
Titanium dioxide (TiO2) has been considered as an anode material for lithium-ion batteries due to its high electroactivity, chemical/physical stability, nature abundance, non-toxicity and low cost. However, despite of these advantages, the use of TiO2 as an anode material is limited because of the low ionic and electronic conductivity. To solve these problems, many approaches have been made including reducing particle size, adding conductive agents, doping foreign ions, changing morphologies and so on, resulting in enhanced kinetics of TiO2. Among them, reducing particle size, which provides short diffusion lengths for both lithium ions and electrons, is regarded as the most effective method. In addition, high accessibility of lithium ions to the electrode-electrolyte interface can be obtained by larger contact area, resulting the high rate performances. On the other hand, it has been reported that introducing oxygen vacancies/Ti3+ state in TiO2 can increase electronic conductivity of TiO2. In this study, TiO2 nanoparticles were prepared by a simple sol-gel method using urea as a dispersant, and oxygen vacancies were introduced to TiO2 nanoparticles via a chemical reduction process. The Ti3+-doped TiO2 nanoparticles were characterized and their electrochemical properties were examined. |
