二氧化钛/石墨烯复合材料的合成及电化学性能

Synthesis and electrochemical performance of TiO_2/graphene composite

为了提高TiO_2的导电性和材料的分散性,进而提高材料的倍率性能和循环性能,将二氧化钛与石墨烯复合,通过水热法合成了二氧化钛/石墨烯(TiO_2/rGO)复合材料,并对材料的形貌进行了表征,测试了材料用于锂离子电池的电化学性能.结果表明:与石墨烯复合后材料的比容量和倍率性能均升高,在电流密度为0.1C(C=150 mA/g)下,初始放电容量为374 mAh/g,50周后的放电比容量仍保持在165 mAh/g,循环保持率为44%,远高于同种方法下合成的二氧化钛样品50周后的比容量50 mAh/g和保持率17%.

In order to increase the electroconductivity and dispersity of TiO2 and improve the rate performance and cycling performance of material, titanium dioxide/graphene composites （TiO2/rGO） was synthesized by hydrothermal method, the morphology and the electrochemical performance of the materials that used in lithium ion batteries have been characterized. The results showed that, the TiO2/rGO composite has higher specific capacity and rate capability compared with the bare TiO2. At the current density of 0.1 C （C=150 mA/g）, the initial discharge capacity of TiO2/rGO is 374 mAh/g, after 50 cycles, the specific capacity of the composites remained at 165 mAh/g, and the retention rate of capacity is 44%, higher than 50 mAh/g and 17% for the bare TiO2 which is synthesized via similar method.