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High performance all-solid-state lithium/sulfur batteries using lithium argyrodite electrolyte

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Abstract

Among the known fast Li+ ion conducting solids, thiophosphates and especially lithium argyrodites Li6PS5 X (X = Cl, Br) exhibit a great potential due to their high ionic conductivities and electrochemical stability. Here, we prepare all-solid-state lithium secondary batteries combining sulfur as the active cathode material with argyrodite-type Li6PS5Br as the solid electrolyte. Composite cathode powder of sulfur, Li6PS5Br and super P carbon are fabricated by a two-step ball milling at high rotating speed of 500 rpm, yielding a uniform composite cathode mixture with a particle size smaller than 100 nm. The resulting all-solid-state S/Li6PS5Br/In-Li batteries with S contents varied over the range of 20–40 wt% show a maximum capacity of 1460 mAh/g (with respect to the weight of sulfur) and a reversible capacity of up to 1080 mAh/g after 50 cycles at C/10 rate. Ex situ X-ray diffraction (XRD) results demonstrate that Li6PS5Br undergoes no structural change throughout the cycling.

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Acknowledgments

This research was supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Competitive Research Programme (CRP Awards No. NRF-CRP 8-2011-4 and NRF-CRP 10-2012-6).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore

    Maohua Chen & Stefan Adams

  2. Department of Materials Science and Engineering, National University of Singapore, 5 Engineering Drive 2, E2 #05-22, Singapore, 117579, Singapore

    Stefan Adams

Authors
  1. Maohua Chen
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  2. Stefan Adams
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Correspondence to Stefan Adams.

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Chen, M., Adams, S. High performance all-solid-state lithium/sulfur batteries using lithium argyrodite electrolyte. J Solid State Electrochem 19, 697–702 (2015). https://doi.org/10.1007/s10008-014-2654-1

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  • DOI: https://doi.org/10.1007/s10008-014-2654-1

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