Substrate-Assisted Self-Organization of Radial 尾-AgVO3 Nanowire Clusters for High Rate Rechargeable Lithium Batteries

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• 作者：Chunhua Han ; Yuqiang Pi ; Qinyou An ; Liqiang Mai ; Junlin Xie ; Xu Xu ; Lin Xu ; Yunlong Zhao ; Chaojiang Niu ; Aamir Minhas Khan ; Xiaoyun He
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：12
• 期：9
• 页码：4668-4673
• 全文大小：362K
• 年卷期：v.12,no.9(September 12, 2012)
• ISSN：1530-6992

文摘

Rational assembly of unique complex nanostructures is one of the facile techniques to improve the electrochemical performance of electrode materials. Here, a substrate-assisted hydrothermal method was designed and applied in synthesizing moundlily like radial 尾-AgVO₃ nanowire clusters. Gravitation and F鈥?/sup> ions have been demonstrated to play important roles in the growth of 尾-AgVO₃ nanowires (NWs) on substrates. The results of cyclic voltammetry (CV) measurement and X-ray diffraction (XRD) characterization proved the phase transformation from 尾-AgVO₃ to Ag_1.92V₄O₁₁ during the redox reaction. Further electrochemical investigation showed that the moundlily like 尾-AgVO₃ nanowire cathode has a high discharge capacity and excellent cycling performance, mainly due to the reduced self-aggregation. The capacity fading per cycle from 3rd to 51st is 0.17% under the current density of 500 mA/g, which is much better than 1.46% under that of 20 mA/g. This phenomenon may be related to the Li⁺ diffusion and related kinetics of the electrode. This method is shown to be an effective and facile technique for improving the electrochemical performance for applications in rechargeable Li batteries or Li ion batteries.

Keywords:

Substrate-assisted hydrothermal method; moundlily like 尾-AgVO₃ nanowires; electrochemical performance; rechargeable lithium batteries; high rate performance