Journal of Alloys and Compounds2022，Vol.89311.DOI:10.1016/j.jallcom.2021.162272

Asymmetric separator integrated with ferroelectric-BaTiO3 and mesoporous-CNT for the reutilization of soluble polysulfide in lithium-sulfur batteries

Saroha, Rakesh Heo, Jungwon Li, Xueying Angulakshmi, N. Lee, Younki Ahn, Hyo-Jun Ahn, Jou-Hyeon Kim, Joo-Hyung
Journal of Alloys and Compounds2022，Vol.89311.DOI:10.1016/j.jallcom.2021.162272
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  • NSTL
  • Elsevier

Asymmetric separator integrated with ferroelectric-BaTiO3 and mesoporous-CNT for the reutilization of soluble polysulfide in lithium-sulfur batteries

Saroha, Rakesh 1Heo, Jungwon 1Li, Xueying 1Angulakshmi, N. 1Lee, Younki 1Ahn, Hyo-Jun 1Ahn, Jou-Hyeon 1Kim, Joo-Hyung1
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作者信息

  • 1. Gyeongsang Natl Univ
  • 折叠

Abstract

In this study we report the use of a hybrid separator coated with mesoporous multi-walled carbon nano tubes (MWCNTs) and ferroelectric BaTiO3 (BTO) as a "conductive scaffold" and polysulfide barrier for high-performance lithium-sulfur batteries. The effectiveness of the hybrid separator was verified by using a high sulfur cathode (70%). The modified separator effectively limited the migration of lithium polysulfides, improved the integrity of the sulfur cathode, and provided a conductive channel for ion and electron transport. As a result, the cell utilizing the separator coated with MWCNT and BTO (AHT-MWCNT-BTO) exhibited excellent electrochemical performance and rate kinetics, delivering a high initial discharge capacity of 1388.6 mAh g(-1) at 0.1 C-rate, corresponding to 83% sulfur utilization in the electrode. Additionally, the cycling performance revealed a 77% capacity retention of the initial value after 100 repeated cycles at 0.5 C-rate. Furthermore, even at a high current density of 2.0 C, the cell with the AHT-MWCNT-BTO-coated separator delivered a discharge capacity of 422.8 mAh g(-1) after 350 cycles, besides significantly increasing the sulfur utilization and effectively improving the electrochemical conversion of trapped polysulfides. These results reveal the exceptional potential of AHT-MWCNT-BTO-coated separators in the development of next generation high-performance lithium-sulfur batteries. (C) 2021 Elsevier B.V. All rights reserved.

Key words

Lithium-sulfur cell/Mesoporous-CNT/Ferroelectric BaTiO3/Hybrid separator/Lithium polysulfides/CARBON NANOTUBE NETWORK/LI-S BATTERIES/COMPOSITE CATHODE/PERFORMANCE/GRAPHENE/INTERLAYER/ELECTRODE/EXPANSION/CAPACITY/SULFIDE

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出版年

2022
Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
被引量19
参考文献量78
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