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Locking metal sulfide nanoparticles in interconnected porous carbon nanofibers with protective macro-porous skin as freestanding anodes for lithium ion batteries

Locking metal sulfide nanoparticles in interconnected porous carbon nanofibers with protective macro-porous skin as freestanding anodes for lithium ion batteries
Locking metal sulfide nanoparticles in interconnected porous carbon nanofibers with protective macro-porous skin as freestanding anodes for lithium ion batteries

An innovative structure of metal sulfide nanoparticles locked in interconnected porous carbon nanofiber with protective macro-porous skin (MxSy@MPCNF) is successfully prepared by electro-blowing spinning technique and subsequent one-step sulfurization/carbonization process. The obtained film is directly used as freestanding anodes for lithium ion batteries (LIBs), which provides a three-dimensional (3D) crosslinked conductive network and ensures the fast penetration of electrolyte. Meanwhile, the interconnected porous structure of fibers provides enough active sites for Li+ storage and shortens the pathways for Li+ transport. Moreover, the protective skin with macro-porous structure endows a fast access pathway for electrolyte and prevents the active nanoparticles from shedding. Most importantly, the metal sulfide nanoparticles are locked in a carbon cage which immobilized by the interconnected porous structure, and strongly bridged to the fiber skeleton through a carbon coating layer. Such a well-designed structure offers enough space for volume change and makes the metal sulfide nanoparticles difficult to detach from the carbon nanofiber support. Benefiting from the above advantages, the optimized freestanding Fe7S8@MPCNF-15 anodes deliver a high reversible capacity of 776 mAh g−1 at 0.2 A g−1 after 200 cycles, and exhibits an excellent cycling stability after 500 cycles with 86% capacity retention at a high current density of 1 A g−1. Extraordinarily, the synthetic method is very versatile and can be easily extended to fabricate Co9S8@MPCNF and Ni9S8@MPCNF composites with excellent electrochemical performances, which will shed some lights on the development of flexible anodes for various energy conversion and storage systems.

Electro-blowing spinning, Freestanding anodes, Interconnected porous structure, Lithium ion batteries, Protective macro-porous skin
1385-8947
Zhou, Xing hai
1f8f8e18-b831-48d3-b3c5-bba2dc22c9cb
Su, Kun mei
fd4d5427-f5b0-4005-9820-8b83a789a053
Kang, Wei min
cc4b875d-6eb9-47b4-b944-9418e85f8d29
Cheng, Bo wen
f894e9e7-3752-4479-8f1b-062a70e73e92
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab
Zhou, Xing hai
1f8f8e18-b831-48d3-b3c5-bba2dc22c9cb
Su, Kun mei
fd4d5427-f5b0-4005-9820-8b83a789a053
Kang, Wei min
cc4b875d-6eb9-47b4-b944-9418e85f8d29
Cheng, Bo wen
f894e9e7-3752-4479-8f1b-062a70e73e92
Jiang, Zheng
bcf19e78-f5c3-48e6-802b-fe77bd12deab

Zhou, Xing hai, Su, Kun mei, Kang, Wei min, Cheng, Bo wen and Jiang, Zheng (2020) Locking metal sulfide nanoparticles in interconnected porous carbon nanofibers with protective macro-porous skin as freestanding anodes for lithium ion batteries. Chemical Engineering Journal, 397, [125271]. (doi:10.1016/j.cej.2020.125271).

Record type: Article

Abstract

An innovative structure of metal sulfide nanoparticles locked in interconnected porous carbon nanofiber with protective macro-porous skin (MxSy@MPCNF) is successfully prepared by electro-blowing spinning technique and subsequent one-step sulfurization/carbonization process. The obtained film is directly used as freestanding anodes for lithium ion batteries (LIBs), which provides a three-dimensional (3D) crosslinked conductive network and ensures the fast penetration of electrolyte. Meanwhile, the interconnected porous structure of fibers provides enough active sites for Li+ storage and shortens the pathways for Li+ transport. Moreover, the protective skin with macro-porous structure endows a fast access pathway for electrolyte and prevents the active nanoparticles from shedding. Most importantly, the metal sulfide nanoparticles are locked in a carbon cage which immobilized by the interconnected porous structure, and strongly bridged to the fiber skeleton through a carbon coating layer. Such a well-designed structure offers enough space for volume change and makes the metal sulfide nanoparticles difficult to detach from the carbon nanofiber support. Benefiting from the above advantages, the optimized freestanding Fe7S8@MPCNF-15 anodes deliver a high reversible capacity of 776 mAh g−1 at 0.2 A g−1 after 200 cycles, and exhibits an excellent cycling stability after 500 cycles with 86% capacity retention at a high current density of 1 A g−1. Extraordinarily, the synthetic method is very versatile and can be easily extended to fabricate Co9S8@MPCNF and Ni9S8@MPCNF composites with excellent electrochemical performances, which will shed some lights on the development of flexible anodes for various energy conversion and storage systems.

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More information

Accepted/In Press date: 27 April 2020
Published date: 1 October 2020
Additional Information: Funding Information: The author would like to thank the financial supports from the National Natural Science Foundation of China (Nos. 21878231 and 51603145 ), Tianjin Natural Science Foundation of China (Nos. 19JCZDJC37300 ) and the Science and Technology Plans of Tianjin (No. 17PTSYJC00040 and 18PTSYJC00180 ). This work was also supported by China National Textile and Apparel Council ( J201406 ) and China Petroleum Chemical Co Technology Development Project ( 216090 and 218008-6 ). Funding Information: The author would like to thank the financial supports from the National Natural Science Foundation of China (Nos. 21878231 and 51603145), Tianjin Natural Science Foundation of China (Nos. 19JCZDJC37300) and the Science and Technology Plans of Tianjin (No.17PTSYJC00040 and 18PTSYJC00180). This work was also supported by China National Textile and Apparel Council (J201406) and China Petroleum Chemical Co Technology Development Project (216090 and 218008-6). Publisher Copyright: © 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
Keywords: Electro-blowing spinning, Freestanding anodes, Interconnected porous structure, Lithium ion batteries, Protective macro-porous skin

Identifiers

Local EPrints ID: 453356
URI: http://eprints.soton.ac.uk/id/eprint/453356
ISSN: 1385-8947
PURE UUID: dbe1b854-9073-458e-9c38-03244d64fcf0
ORCID for Zheng Jiang: ORCID iD orcid.org/0000-0002-7972-6175

Catalogue record

Date deposited: 13 Jan 2022 18:13
Last modified: 06 Jun 2024 01:52

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Contributors

Author: Xing hai Zhou
Author: Kun mei Su
Author: Wei min Kang
Author: Bo wen Cheng
Author: Zheng Jiang ORCID iD

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