A novel MWCNT/nanotubular TiO₂(B) loaded with SnO₂ nanocrystals ternary composite as anode material for lithium-ion batteries

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• 作者：Jiao Zheng ; Daqian Ma ; Xiangfeng Wu ; Peng Dou ; Zhenzhen Cao…
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：52
• 期：6
• 页码：3016-3027
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
• 出版者：Springer US
• ISSN：1573-4803
• 卷排序：52

文摘

A novel MWCNT/long nanotubular TiO₂(B) loaded with SnO₂ nanocrystals (SnO₂NC/TiO₂(B)NT/MWCNT) ternary composite has been prepared by two-step hydrothermal method and used as the anode material for the first time. In this work, the mechanical stirring improved the diffusion and surface reaction rates of reactants and promoted the appearance of longer intermediate TiO₂(B) nanosheets, leading to the formation of TiO₂(B) nanotubes with a length of ~9 μm. Among the SnO₂NC/TiO₂(B)NT/MWCNT composite, the wrapping and mechanical supporting functions of TiO₂(B) nanotubes can effectively avoid the pulverization and aggregation of SnO₂ nanocrystals (SnO₂NC) in lithium-ion charging and discharging process. Moreover, the synergistic effects of nanotubular TiO₂(B) coating layer and three-dimensional interconnected network structure composed of TiO₂(B) nanotubes and MWCNT were taken to mitigate volume expansion of SnO₂NC and improve the transport of lithium ion and electron in the network. Tested as anode materials, the SnO₂NC/TiO₂(B)NT/MWCNT composite maintained 211 mAh g−1 at 3000 mA g−1 after three testing processes with alternative current density of 200 and 3000 mA g−1 and could rebound to 338 mAh g−1 at a current density of 200 mA g−1, indicating an effective way to optimize electrochemical properties of SnO₂ as anode material.