A lithium passivated MoO3 nanobelt decorated polypropylene separator for fast-charging long-life Li–S batteries

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...

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Bibliographic Details
Published in:Nanoscale 2019-01, Vol.11 (6), p.2892-2900
Main Authors: Kaisar, Nahid, Syed Ali Abbas, Ding, Jiang, Hsin-An, Chen, Chun-Wei, Pao, Karunakara Moorthy Boopathi, Mohapatra, Anisha, Yu-Ting, Chen, Sheng Hui Wu, Fang, Jason, Jou, Shyankay, Chih Wei Chu
Format: Article
Language:English
Subjects:
Charge transfer
Charging
Commercialization
Discharge
Energy consumption
Lithium sulfur batteries
Molybdenum oxides
Molybdenum trioxide
Polypropylene
Polysulfides
Separators
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Summary: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 polypropylene (PP) coated with MoO3 nanobelts (MNBs), prepared through facile grinding of commercial MoO3 powder. The formation of Li2Sn–MoO3 during discharging inhibited the polysulfide shuttling; during charging, Li passivated LixMoO3 facilitated ionic transfer during the redox reaction by decreasing the charge transfer resistance. This dual-interaction mechanism of LiPS—with both Mo and the 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 MNB-coated separator suggest a scalable solution for future commercialization of LSBs.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr08262f