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Lithium passivated MoO3 nanobelts decorated polypropylene separator for fast-charging long-life Li-S battery

Abstract

Dissolution of lithium polysulfide (LiPS) into the electrolyte during discharging, causing shuttling of LiPS from the cathode to the lithium (Li) metal, is mainly responsible for the capacity decay and short battery life of lithium–sulfur batteries (LSBs). Herein, we designed a separator—comprising of polypropylene (PP) coated with MoO3 nanobelts (MNBs), prepared through facile grinding of commercial MoO3 powder. Formation of Li2Sn–MoO3 during discharging inhibited the polysulfide shuttling; during charging, Li passivated LixMoO3 facilitating ionic transfer during the redox reaction by decreasing the charge transfer resistance. This dual-interaction mechanism of LiPS—with both Mo and formation of LixMoO3—resulted in a substantially high initial discharge capacity at a very high current density of 5C, with 29.4% of the capacity retained after 5000 cycles. The simple fabrication approach and extraordinary cycle life observed when using this MNBs-coated separator suggests a scalable solution for future commercialization of LSBs.

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Publication details

The article was received on 12 Oct 2018, accepted on 31 Dec 2018 and first published on 02 Jan 2019


Article type: Paper
DOI: 10.1039/C8NR08262F
Citation: Nanoscale, 2019, Accepted Manuscript
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    Lithium passivated MoO3 nanobelts decorated polypropylene separator for fast-charging long-life Li-S battery

    N. Kaisar, S. A. Abbas, J. Ding, H. Chen, C. Pao, K. M. Boopathi, A. Mohapatra, Y. Chen, S. Wu, J. Fang, S. Jou and C. W. Chu, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR08262F

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