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Fully integrated hierarchical double-shelled Co9S8@CNT nanostructures with unprecedented performance for Li–S batteries

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Abstract

The insulating and dissoluble features of sulfur and polysulfide intermediates significantly hinder the cycling performance and coulombic efficiency of Li–S batteries. We herein design fully integrated hierarchical double-shelled Co9S8@CNT hollow nanospheres as a sulfur host, where each shell owns a tri-layer sandwich structure and six functional layers are constructed in total. Uniquely, the hierarchical structures integrate the beneficial functions of electrical conductivity, ion diffusion, polysulfide immobilization and polysulfide redox kinetics. The Co9S8@CNT/S delivers a reversible specific capacity of 1415 mA h g−1 at 0.2C, which is very close to the theoretical capacity of sulfur. Moreover, even at a high rate of 10C, an unprecedented capacity of 676.7 mA h g−1 can still be achieved, which represents the best rate capability among the ever-reported sulfur cathodes with similar sulfur content. More importantly, the Co9S8@CNT/S also displays a high coulombic efficiency of nearly 100% and an excellent cycling performance for up to 1000 cycles with a capacity fading rate of only 0.0448% per cycle. Even at the loading amount of 5.5 mg cm−2, the areal capacity can still reach 4.3 mA h cm−2. The concept to rationally integrate distinct components into fully functional units could provide valuable insights for the development of Li–S batteries and beyond.

Graphical abstract: Fully integrated hierarchical double-shelled Co9S8@CNT nanostructures with unprecedented performance for Li–S batteries

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Publication details

The article was received on 05 Sep 2018, accepted on 26 Sep 2018 and first published on 27 Sep 2018


Article type: Communication
DOI: 10.1039/C8NH00289D
Citation: Nanoscale Horiz., 2019, Advance Article
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    Fully integrated hierarchical double-shelled Co9S8@CNT nanostructures with unprecedented performance for Li–S batteries

    J. Zhou, X. Liu, J. Zhou, H. Zhao, N. Lin, L. Zhu, Y. Zhu, G. Wang and Y. Qian, Nanoscale Horiz., 2019, Advance Article , DOI: 10.1039/C8NH00289D

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