Anion-controlled synthesis of TiO2 nano-aggregates for Li ion battery electrodes
- Anion-controlled synthesis of TiO2 nano-aggregates for Li ion battery electrodes
- 박상백; 송희조; 김재찬; 노희석; 이찬우; 김동완; 홍국선
- Issue Date
- Materials characterization
- VOL 96-20
- Nano-sized anatase TiO2 was synthesized using surfactant-free hydrolysis method by controlling the ratio of anions in solution. The particle sizes of TiO2 were systematically tuned by the molar ratio of the Ti4+ precursors (chlorides and sulfates). Each TiO2 particle consists of an aggregation of 5 nm primary crystallites, resulting in a large specific surface area. TiO2 nano-aggregates (TiO2 NAs) which were 50 nm in size exhibited the best cycle stability. After calcination, the capacity of the TiO2 NA was enhanced to 171 mAh g(-1) at 100 cycles at a rate of 0.2 C due to the removal of impediments such as a hydroxyl group and physisorbed water, indicating that more than 0.5 Li was inserted into TiO2 at 100 cycles, and that these NAs had good rate capability at high current densities
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