Sb<inf>2</inf>O<inf>3</inf>/MXene(Ti<inf>3</inf>C<inf>2</inf>T<inf>x</inf>) hybrid anode materials with enhanced performance for sodium-ion batteries

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Journal Article
Journal of Materials Chemistry A, 2017, 5 (24), pp. 12445 - 12452
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© 2017 The Royal Society of Chemistry. MXenes, a novel family of two dimensional (2D) materials with excellent electronic conductivity and hydrophilicity, have emerged as a promising material for energy storage. Based on the intercalation mechanism, MXenes have demonstrated an excellent performance for supercapacitors but low capacities for sodium-ion batteries. Herein, we developed a facile solution-phase method to fabricate the Sb2O3/MXene(Ti3C2Tx) hybrid materials for sodium storage with enhanced electrochemical performances. The as-prepared Sb2O3/Ti3C2Txcomposite has a hierarchical structure with Sb2O3nanoparticles (sub-50 nm) uniformly incorporated in the MXene Ti3C2Tx3D networks. The Sb2O3nanoparticles serve as a sufficient sodium ion reservoir; meanwhile, the MXene Ti3C2Txnetwork provides highly efficient pathways for transport of electrons and Na-ions. The volume expansion of Sb2O3during sodiation/desodiation can be buffered and confined between the 2D Ti3C2Txsheets. As a result, the Sb2O3/Ti3C2Txhybrid anodes present good structural stability and superior electrochemical performance in Na-ion batteries, including an excellent rate performance with a capacity of 295 mA h g-1at 2 A g-1, and an enhanced cycling performance with a capacity of 472 mA h g-1after 100 cycles at 100 mA g-1. This work is expected to inspire the development of MXene materials for high performance batteries.
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