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Removing structural water from sodium titanate anode towards barrier-free ion diffusion for sodium ion batteries

Abstract

Nanostructures have been proved to be a promising strategy to realize fast Na-ion diffusion and high electrochemical activity for sodium titanate anodes. However, most researchers pay their attentions to the controllable synthesis of nano-morphology for sodium titanate, there is few report about the existence of water molecule and its influence on the structure and electrochemical performance for these solution-synthesized sodium titanate electrode. Herein, an urchin-like layered sodium titanate ultrafine nanowires is synthesized and the existence of structural water in it is confirmed. Its structure evolution upon the removing of water is investigated by SEM, XRD, TEM, IR and Raman. The departure of interlayer water not only leads a morphology change from ultrafine nanowires to highly crystalline nanorods, but also induces a structure transformation from layered NaTi3O6(OH)•2H2O to tunnel structured Na2Ti6O13. The electrochemical analysis confirms that the dehydrated sample exhibits a better rate capability and enhanced cycling performance, suggesting that the existence of interlayer water in sodium titanate is unfavourable for the sodium ion diffusion in TiO6 octahedra layers. Our findings give a new understanding for the design and synthesis of sodium titanate nanostructure with high rate capability.

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Publication details

The article was received on 15 Jun 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA05217K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Removing structural water from sodium titanate anode towards barrier-free ion diffusion for sodium ion batteries

    Q. Zhang, T. Zhang, Y. Wei, T. Zhai and H. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA05217K

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