Oh Seung-Min, Hwang Jang-Yeon, Yoon C S, Lu Jun, Amine Khalil, Belharouak Illias, Sun Yang-Kook
Department of Energy Engineering and ‡Department of Materials Science and Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
ACS Appl Mater Interfaces. 2014 Jul 23;6(14):11295-301. doi: 10.1021/am501772a. Epub 2014 Jul 1.
High-power, long-life carbon-coated TiO2 microsphere electrodes were synthesized by a hydrothermal method for sodium ion batteries, and the electrochemical properties were evaluated as a function of carbon content. The carbon coating, introduced by sucrose addition, had an effect of suppressing the growth of the TiO2 primary crystallites during calcination. The carbon coated TiO2 (sucrose 20 wt % coated) electrode exhibited excellent cycle retention during 50 cycles (100%) and superior rate capability up to a 30 C rate at room temperature. This cell delivered a high discharge capacity of 155 mAh g(composite)(-1) at 0.1 C, 149 mAh g(composite)(-1) at 1 C, and 82.7 mAh g(composite)(-1) at a 10 C rate, respectively.
采用水热法合成了用于钠离子电池的高功率、长寿命碳包覆TiO₂微球电极，并根据碳含量对其电化学性能进行了评估。通过添加蔗糖引入的碳涂层在煅烧过程中具有抑制TiO₂初级晶粒生长的作用。碳包覆TiO₂（蔗糖包覆量为20 wt%）电极在50次循环中表现出优异的循环保持率（100%），在室温下高达30 C倍率时具有优异的倍率性能。该电池在0.1 C、1 C和10 C倍率下的放电容量分别为155 mAh g(复合材料)(-1)、149 mAh g(复合材料)(-1)和82.7 mAh g(复合材料)(-1)。
