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Probing three-dimensional sodiation–desodiation equilibrium in sodium-ion batteries by in situ hard X-ray nanotomography

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  • Jiajun Wang

    (National Synchrotron Light Source II, Brookhaven National Laboratory)

  • Christopher Eng

    (National Synchrotron Light Source II, Brookhaven National Laboratory)

  • Yu-chen Karen Chen-Wiegart

    (National Synchrotron Light Source II, Brookhaven National Laboratory)

  • Jun Wang

    (National Synchrotron Light Source II, Brookhaven National Laboratory)

Abstract

Materials degradation—the main limiting factor for widespread application of alloy anodes in battery systems—was assumed to be worse in sodium alloys than in lithium analogues due to the larger sodium-ion radius. Efforts to relieve this problem are reliant on the understanding of electrochemical and structural degradation. Here we track three-dimensional structural and chemical evolution of tin anodes in sodium-ion batteries with in situ synchrotron hard X-ray nanotomography. We find an unusual (de)sodiation equilibrium during multi-electrochemical cycles. The superior structural reversibility during 10 electrochemical cycles and the significantly different morphological change features from comparable lithium-ion systems suggest untapped potential in sodium-ion batteries. These findings differ from the conventional thought that sodium ions always lead to more severe fractures in the electrode than lithium ions, which could have impact in advancing development of sodium-ion batteries.

Suggested Citation

  • Jiajun Wang & Christopher Eng & Yu-chen Karen Chen-Wiegart & Jun Wang, 2015. "Probing three-dimensional sodiation–desodiation equilibrium in sodium-ion batteries by in situ hard X-ray nanotomography," Nature Communications, Nature, vol. 6(1), pages 1-9, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8496
    DOI: 10.1038/ncomms8496
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