Two-dimensional Sb@TiO <inf>2-: X</inf> nanoplates as a high-performance anode material for sodium-ion batteries

Publication Type:
Journal Article
Journal of Materials Chemistry A, 2019, 7 (6), pp. 2553 - 2559
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© 2019 The Royal Society of Chemistry. Alloy-based anode materials, including antimony (Sb), with high electronic conductivity and high capacity show great potential for sodium-ion batteries. However, the significant volume change of Sb leads to pulverization of active material and rapid capacity decay. Herein, two-dimensional (2D) Sb@TiO 2-x nanoplates, consisting of an amorphous TiO 2-x layer coated with ultra-small Sb nanocrystals, are prepared by a facile salt-template method. The incorporation of electrochemical/thermally-stable TiO 2-x is helpful to buffer the volume change of Sb and stabilize the SEI layer. In addition, the 2D structure of the Sb@TiO 2-x nanoplates can facilitate sodium ion diffusion and electronic transport during cycling. As a result, the 2D-Sb@TiO 2-x electrodes deliver a high reversible capacity of 568 mA h g -1 at 100 mA g -1 , good rate capability (429 mA h g -1 at 3200 mA g -1 ) and stable cycling performance with a capacity retention of 95.2% after 100 cycles.
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