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MOF-derived hierarchical CoP nanoflakes anchored on vertically erected graphene scaffolds as self-supported and flexible hosts for lithium–sulfur batteries

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Abstract

Lithium–sulfur (Li–S) batteries have garnered a lot of attention in the realm of electrochemical energy storage owing to their high energy and low cost. However, the serious polysulfide shuttle effect of the sulfur cathode poses a critical challenge for the development of Li–S batteries with elevated sulfur loadings. In addition, the poor robustness of traditional blade-casting cathodes greatly impedes the practical applications of flexible Li–S cells that display high areal capacity. To address these concerns, we report herein a freestanding hybrid sulfur host via in situ crafting of flexible carbon cloth (CC), vertically grown graphene nanoflakes over CC (G/CC) and metal–organic-framework derived CoP anchored on vertical graphene (CoP@G/CC). The thus-derived sulfur cathodes (CoP@G/CC-S) with a typical sulfur loading of 2 mg cm−2 exhibit outstanding electrochemical performances, including excellent rate capability (930.1 mA h g−1 at 3.0C) and impressive cycling stability (0.03% capacity decay per cycle after 500 cycles at 2.0C). A high areal capacity of 8.81 mA h cm−2 at 0.05C can also be obtained even at an elevated sulfur loading of 10.83 mg cm−2. Furthermore, flexible pouch cells based on the self-supported CoP@G/CC-S showcase favorable rate and cycling performances with high mechanical robustness.

Graphical abstract: MOF-derived hierarchical CoP nanoflakes anchored on vertically erected graphene scaffolds as self-supported and flexible hosts for lithium–sulfur batteries

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Supplementary files

Article information


Submitted
28 Nov 2019
Accepted
13 Jan 2020
First published
14 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

MOF-derived hierarchical CoP nanoflakes anchored on vertically erected graphene scaffolds as self-supported and flexible hosts for lithium–sulfur batteries

J. Jin, W. Cai, J. Cai, Y. Shao, Y. Song, Z. Xia, Q. Zhang and J. Sun, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13046B

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