HF-Free Synthesis of Anatase TiO2 Nanosheets with Largely Exposed and Clean {001} facets and Their Enhanced Rate Performance As Anodes of Lithium-Ion Battery
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- 作者：Xun-Liang Cheng ; Ming Hu ; Rong Huang ; Ji-Sen Jiang
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2014
- 出版时间：November 12, 2014
- 年：2014
- 卷：6
- 期：21
- 页码：19176-19183
- 全文大小：666K
- ISSN：1944-8252
文摘
An interface between toluene and water was utilized to synthesize ca. 10 nm thick of anatase TiO<sub>2sub> nanosheets (NSs) with 82% exposure of {001} facets. In this procedure, highly corrosive and toxic HF, which was generally used to prepare TiO<sub>2sub> NSs with largely exposed high energy facets, was avoided. Furthermore, the surfaces of the NSs were quite clean as suggested by XPS analysis. Serving as anode materials in lithium-ion batteries, these as-prepared anatase TiO<sub>2sub> NSs manifested a low initial irreversible capacity loss (12.5% at 1 C), an excellent capacity retention at 10 C charge鈥揹ischarge rate (101.9 mA h g<sup>鈥?sup> after 100 cycles), and enhanced rate performance at 0.5鈥?0 C current rates in compared with Degussa P25 TiO<sub>2sub> nanoparticles (NPs). Their excellent electrochemical performances were mainly derived from the large proportion of {001} exposed facets and a very short diffusion pathway, which allowed fast and efficient Li<sup>+sup> transportation in the electrodes.