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Dual redox mediators accelerate the electrochemical kinetics of lithium-sulfur batteries

Author

Listed:
  • Fang Liu

    (University of California)

  • Geng Sun

    (University of California)

  • Hao Bin Wu

    (University of California)

  • Gen Chen

    (University of California)

  • Duo Xu

    (University of California)

  • Runwei Mo

    (University of California)

  • Li Shen

    (University of California)

  • Xianyang Li

    (University of California)

  • Shengxiang Ma

    (University of California)

  • Ran Tao

    (University of California)

  • Xinru Li

    (University of California)

  • Xinyi Tan

    (University of California)

  • Bin Xu

    (Jilin University)

  • Ge Wang

    (University of Science and Technology Beijing)

  • Bruce S. Dunn

    (University of California)

  • Philippe Sautet

    (University of California
    University of California)

  • Yunfeng Lu

    (University of California)

Abstract

The sluggish electrochemical kinetics of sulfur species has impeded the wide adoption of lithium-sulfur battery, which is one of the most promising candidates for next-generation energy storage system. Here, we present the electronic and geometric structures of all possible sulfur species and construct an electronic energy diagram to unveil their reaction pathways in batteries, as well as the molecular origin of their sluggish kinetics. By decoupling the contradictory requirements of accelerating charging and discharging processes, we select two pseudocapacitive oxides as electron-ion source and drain to enable the efficient transport of electron/Li+ to and from sulfur intermediates respectively. After incorporating dual oxides, the electrochemical kinetics of sulfur cathode is significantly accelerated. This strategy, which couples a fast-electrochemical reaction with a spontaneous chemical reaction to bypass a slow-electrochemical reaction pathway, offers a solution to accelerate an electrochemical reaction, providing new perspectives for the development of high-energy battery systems.

Suggested Citation

  • Fang Liu & Geng Sun & Hao Bin Wu & Gen Chen & Duo Xu & Runwei Mo & Li Shen & Xianyang Li & Shengxiang Ma & Ran Tao & Xinru Li & Xinyi Tan & Bin Xu & Ge Wang & Bruce S. Dunn & Philippe Sautet & Yunfeng, 2020. "Dual redox mediators accelerate the electrochemical kinetics of lithium-sulfur batteries," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19070-8
    DOI: 10.1038/s41467-020-19070-8
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    Cited by:

    1. Minxia Jiang & Yingjie Hu & Baoguang Mao & Yixin Wang & Zhen Yang & Tao Meng & Xin Wang & Minhua Cao, 2022. "Strain-regulated Gibbs free energy enables reversible redox chemistry of chalcogenides for sodium ion batteries," Nature Communications, Nature, vol. 13(1), pages 1-13, December.

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