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MnO2 nanoflowers grown on a polypropylene separator for use as both a barrier and an accelerator of polysulfides for high-performance Li–S batteries

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Abstract

The separator modification has been considered to be the most effective approach to obtain high-stability lithium–sulfur batteries (LSBs). Therefore, a separator with an ultralight modification layer plays an indispensable role to obtain LSBs with high specific capacity and high energy density. Herein, we report a novel modified separator with an ultrathin and lightweight MnO2 functional layer (500 nm, 0.1 mg cm−2), which was grown in situ on a Celgard-2400 separator (MnO2@PP) via a facile hydrothermal reaction. The MnO2@PP separator effectively suppressed the shuttle of lithium polysulfides (LiPSs) and improved the redox process. In addition, the strong chemical affinity of MnO2 for LiPSs was also verified by first-principles calculations. Benefiting from these advantages, the cell with the MnO2@PP separator delivered a high rate performance of 759 mA h g−1 at 2.5 C and an initial capacity of 825 mA h g−1 with a retention of 684 mA h g−1 after 400 cycles at 1.25 C. Even with a high sulfur loading of 6 mg cm−2, the obtained cell exhibited a reversible capacity of 747 mA h g−1 after 150 cycles.

Graphical abstract: MnO2 nanoflowers grown on a polypropylene separator for use as both a barrier and an accelerator of polysulfides for high-performance Li–S batteries

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Supplementary files

Article information


Submitted
20 Apr 2020
Accepted
17 Jun 2020
First published
17 Jun 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

MnO2 nanoflowers grown on a polypropylene separator for use as both a barrier and an accelerator of polysulfides for high-performance Li–S batteries

Y. Zuo, T. Yan, Y. Zhu, J. Zhou, W. Su, X. Shi, Y. Tang and Y. Chen, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT01435D

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