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化工学报  2013 

K2Ti4O9制备TiO2-B纤维快速嵌锂负极材料

DOI: 10.3969/j.issn.0438-1157.2013.01.044, PP. 374-380

Keywords: TiO2-B纤维,四钛酸钾,负极材料,锂离子电池

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Abstract:

以四钛酸钾(K2Ti4O9)经离子交换得到的四钛酸(H2Ti4O9·xH2O)为前驱体,经过不同温度热处理得到不同结晶度的氧化钛纤维。对样品进行XRD、Raman、FE-SEM及TEM等结构形貌表征,发现600℃烧结可得到纯相、高结晶度的TiO2-B材料。并考察了其作为锂离子电池负极材料的容量、倍率和稳定性。嵌锂性能测试发现,TiO2-B相材料的首放容量可以达到225mA·h·g-1,比相近结构的锐钛矿(anatase)相材料高50mA·h·g-1,即22.5%的容量。与相似结构anatase材料的倍率结果对比发现,TiO2-B纤维倍率性能更高,主要是TiO2-B纤维的开放结构使其锂离子扩散系数达到1.92×10-7cm2·s-1,是anatase相材料的8倍。1C稳定性测试发现循环80次后容量仍然高于anatase,且最终容量稳定在159mA·h·g-1,比anatase材料的64mA·h·g-1高1.5倍。

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