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      Sn–Bi–Sb alloys as anode materials for sodium ion batteries

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          Abstract

          The cycling stability of Sb-based anodes for sodium-ion batteries can be greatly improved by adding Sn and Bi atoms in a substitutional solid solution with the host Sb lattice.

          Abstract

          In this work, the performance and electrochemical charge/discharge behavior of Sn–Bi–Sb alloy films were examined, as well as pure Sn, Bi, and Sb films, as anodes for sodium ion batteries (SIBs). Alloying was utilized as an approach to modify the morphology and active phases in an effort to improve the cycling stability of elemental anodes of Sn or Sb, while maintaining a high capacity. The films were prepared via sputtering, which enabled study of a broad swath of compositional space. The cycling performance of the Sb-rich compositions surpassed that of all other alloys tested as anodes for SIBs. The best performing alloy had a composition of 10 at% Sn, 10 at% Bi, and 80 at% Sb (called Sn10Bi10Sb80, here), and maintained 99% of its maximum capacity during cycling (621 mA h g −1) after 100 cycles. Stability of these anodes dropped as the quantity of Sb decreased; to contrast, Sn20Bi20Sb60, Sn25Bi25Sb50 and Sn33Bi33Sb33 were increasingly less stable as anodes in SIBs as the molar quantity of Sb in the films dropped to 60%, 50%, and 33%, respectively. The Sn10Bi10Sb80 electrode was found to possess a single phase as-deposited microstructure of Sn and Bi in substitutional solid solution with the Sb lattice and the sodiation sequence was found to be significantly different from pure Sb. Numerous possible mechanisms for the improvement in capacity retention were discussed, where modification and material response to internal stresses by changes in the Sb chemical potential and solid solution strengthening were found to be the most likely.

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          Research development on sodium-ion batteries.

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            Sodium-Ion Batteries

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              Na-ion batteries, recent advances and present challenges to become low cost energy storage systems

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                Author and article information

                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                2017
                2017
                : 5
                : 20
                : 9661-9670
                Affiliations
                [1 ]Department of Chemistry
                [2 ]University of Alberta
                [3 ]Edmonton
                [4 ]Canada
                [5 ]National Institute for Nanotechnology
                [6 ]Chemical & Biomolecular Engineering and Mechanical Engineering
                [7 ]Clarkson University
                [8 ]Potsdam
                [9 ]USA
                Article
                10.1039/C7TA01443K
                72cc5e0b-4353-42a3-811f-360bc5b7d97f
                © 2017
                History

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