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Nano Research 2021, 14(12): 4865-4877 https://doi.org/10.1007/s12274-021-3446-4
Research Article | Issue | Published: 10 April 2021

Designing of multifunctional and flame retardant separator towards safer high-performance lithium-sulfur batteries

Show Author's Information Junling Wang1,2,  Wei Cai1,  Xiaowei Mu1,  Longfei Han1,  Na Wu1,  Can Liao1,  Yongchun Kan1( ),  Yuan Hu1( )
State Key Laboratory of Fire Science CAS Key Laboratory of Soft Matter Chemistry University of Science and Technology of China Hefei 230026 China
Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control College of Safety Science and Engineering Nanjing Tech University Nanjing 211816 China
Keywords:
lithium dendrites, metal-organic-frameworks, shuttle behavior, flame retardancy
Topics:
Lithium batteries
Cite this article:
Wang J, Cai W, Mu X, et al. Designing of multifunctional and flame retardant separator towards safer high-performance lithium-sulfur batteries. Nano Research, 2021, 14(12): 4865-4877. https://doi.org/10.1007/s12274-021-3446-4
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Abstract Full text Electronic supplementary material About this article

Owing to unprecedented merits such as high theoretical capacity, superior energy density and low cost, lithium-sulfur batteries (LSBs) show a bright future both in scientific and industrial areas. Whereas, the inherent issues, including highly insulating character, undesired shuttle behavior and lithium dendrites growth, are seriously impeding its practical usage. Here, a metal-organic-frameworks (MOFs) derived N, S co-doped carbon nanotube hollow architecture confining with CoS2 nanoparticles (CoS2/NSCNHF) modified separator is designed to surmount these obstacles. Compared with Celgard separator, this designed separator shows obviously enhanced flame retardancy, giving 73.1% and 53.0% reductions in peak heat release rate and total heat release, separately. Concretely, its hollow structure, conductive feature, electrocatalytic activity and Lewis acid-base interaction enable the efficient inhibition on shuttle behavior as well as boost in polysulfides conversion kinetics. The cell with modified separator delivers a high discharge capacity of 1, 284.5 mAh·g–1. After running for 100 cycles, a discharge capacity of 661.3 mAh·g–1 is remained. Markedly, the suppression on lithium dendrites growth is also observed, manifesting the enhanced battery safety. Overall, this work may shed light on the effective usage of MOFs-derived hierarchical composite in achieving LSBs with high electrochemical performance as well as safety.


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Abstract
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Electronic supplementary material
About this article

Designing of multifunctional and flame retardant separator towards safer high-performance lithium-sulfur batteries

Show Author's information Junling Wang1,2, Wei Cai1, Xiaowei Mu1, Longfei Han1, Na Wu1, Can Liao1, Yongchun Kan1( ), Yuan Hu1( )
State Key Laboratory of Fire Science CAS Key Laboratory of Soft Matter Chemistry University of Science and Technology of China Hefei 230026 China
Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control College of Safety Science and Engineering Nanjing Tech University Nanjing 211816 China

Abstract

Owing to unprecedented merits such as high theoretical capacity, superior energy density and low cost, lithium-sulfur batteries (LSBs) show a bright future both in scientific and industrial areas. Whereas, the inherent issues, including highly insulating character, undesired shuttle behavior and lithium dendrites growth, are seriously impeding its practical usage. Here, a metal-organic-frameworks (MOFs) derived N, S co-doped carbon nanotube hollow architecture confining with CoS2 nanoparticles (CoS2/NSCNHF) modified separator is designed to surmount these obstacles. Compared with Celgard separator, this designed separator shows obviously enhanced flame retardancy, giving 73.1% and 53.0% reductions in peak heat release rate and total heat release, separately. Concretely, its hollow structure, conductive feature, electrocatalytic activity and Lewis acid-base interaction enable the efficient inhibition on shuttle behavior as well as boost in polysulfides conversion kinetics. The cell with modified separator delivers a high discharge capacity of 1, 284.5 mAh·g–1. After running for 100 cycles, a discharge capacity of 661.3 mAh·g–1 is remained. Markedly, the suppression on lithium dendrites growth is also observed, manifesting the enhanced battery safety. Overall, this work may shed light on the effective usage of MOFs-derived hierarchical composite in achieving LSBs with high electrochemical performance as well as safety.

Keywords: lithium dendrites, metal-organic-frameworks, shuttle behavior, flame retardancy

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Publication history
Copyright
Acknowledgements

Publication history

Received: 26 December 2020
Revised: 23 February 2021
Accepted: 09 March 2021
Published: 10 April 2021
Issue date: December 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

The work was financially supported by the National Natural Science Foundation of China (No. 51704269), Fundamental Research Funds for the Central Universities (No. WK2320000047) and the Fundamental Research Funds for the Central Universities (No. WK2320000039).

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