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Understanding the electrochemical processes of SeS2 positive electrodes for developing high-performance non-aqueous lithium sulfur batteries

Author

Listed:
  • Ji Hwan Kim

    (Institute for Basic Science (IBS)
    Seoul National University)

  • Mihyun Kim

    (Korea University)

  • Seong-Jun Kim

    (Seoul National University
    Korea University)

  • Shin-Yeong Kim

    (Institute for Basic Science (IBS)
    Seoul National University)

  • Seungho Yu

    (Korea Institute of Science and Technology
    Korea University of Science and Technology)

  • Wonchan Hwang

    (Institute for Basic Science (IBS)
    Seoul National University)

  • Eunji Kwon

    (Korea University
    Korea Institute of Science and Technology)

  • Jae-Hong Lim

    (POSTECH)

  • So Hee Kim

    (Korea Institute of Science and Technology)

  • Yung-Eun Sung

    (Institute for Basic Science (IBS)
    Seoul National University)

  • Seung-Ho Yu

    (Korea University
    Korea University)

Abstract

SeS2 positive electrodes are promising components for the development of high-energy, non-aqueous lithium sulfur batteries. However, the (electro)chemical and structural evolution of this class of positive electrodes is not yet fully understood. Here, we use operando physicochemical measurements to elucidate the dissolution and deposition processes in the SeS2 positive electrodes during lithium sulfur cell charge and discharge. Our analysis of real-time imaging reveals the pivotal role of Se in the SeS2 nucleation process, while S enables selective depositions. During the initial discharge, SeS2 converts into Se and S separately, with the dissolved Se acting as nucleation sites due to their lower nucleation potential. The Se effectively catalyzes the growth of S particles, resulting in improved lithium sulfur battery performance compared to cells using positive electrodes containing only Se or S as active materials. By adjusting the Se-to-S ratio, we demonstrate that a low concentration of Se enables uniform catalytic sites, promotes the homogeneous distribution of S and favours improved lithium sulfur battery performance.

Suggested Citation

  • Ji Hwan Kim & Mihyun Kim & Seong-Jun Kim & Shin-Yeong Kim & Seungho Yu & Wonchan Hwang & Eunji Kwon & Jae-Hong Lim & So Hee Kim & Yung-Eun Sung & Seung-Ho Yu, 2024. "Understanding the electrochemical processes of SeS2 positive electrodes for developing high-performance non-aqueous lithium sulfur batteries," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51647-5
    DOI: 10.1038/s41467-024-51647-5
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    References listed on IDEAS

    as
    1. Shiyuan Zhou & Jie Shi & Sangui Liu & Gen Li & Fei Pei & Youhu Chen & Junxian Deng & Qizheng Zheng & Jiayi Li & Chen Zhao & Inhui Hwang & Cheng-Jun Sun & Yuzi Liu & Yu Deng & Ling Huang & Yu Qiao & Gu, 2023. "Visualizing interfacial collective reaction behaviour of Li–S batteries," Nature, Nature, vol. 621(7977), pages 75-81, September.
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