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Multi‐functional TiO 2 nanosheets/carbon nanotubes modified separator enhanced cycling performance for lithium‐sulfur batteries
Author(s) -
Chen Peng,
Wang Zexi,
Zhang Bingyu,
Zhao Jianxun,
Liu Heng,
Guo Xin,
Liu Wanqiang,
Su Zhongmin
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5171
Subject(s) - nanosheet , faraday efficiency , materials science , separator (oil production) , carbon nanotube , chemical engineering , electrolyte , coating , wetting , electrochemistry , polysulfide , lithium–sulfur battery , exfoliation joint , nanotube , nanotechnology , composite material , electrode , chemistry , graphene , physics , engineering , thermodynamics
Summary TiO 2 nanosheets (TiO 2 NSs) have been investigated for lithium‐sulfur (Li‐S) batteries as strategically designed TiO 2 nanosheet/carbon nanotube (TiO 2 NS/CNT) composite modified polypropylene (PP) separator to inhibit the shuttling of the intermediate polysulfides. The modified separator was fabricated by the vacuum filtration method using the exfoliation TiO 2 NSs and untreated carbon nanotube (CNT) composites. The multi‐functional TiO 2 NS/CNT coating not only reduced the electrochemical resistance but also localized the migrating polysulfides by the cooperative effect of physical adsorption and chemical binding. Specifically, the composition ratio of TiO 2 NSs/CNTs and the interface character have been studied. It was found that the optimum ratio and perfect electrolyte wettability of the TiO 2 NS/CNT layers were all the critical reasons to achieve good battery performance. The high initial discharge capacity of 1247 mA h g −1 at 0.2 C rate, which was 75% of the theoretical capacity of sulfur, 98% average coulombic efficiency, and 627 mA h g −1 discharge capacity retention after 100 cycles were obtained with the TiO 2 NS/CNT coating separator.