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Chemical anchoring of SeS2 on a fluoro-substituted covalent organic framework as a high-performance cathode material

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Abstract

In this work, a high-performance cathode material was achieved by using SeS2 post-functionalization of a fluorinated covalent organic framework (COF) through SNAr chemistry. The chemical and physical confinement of polysulfides and polyselenides combined with enhanced conductivity boosted its electrochemical performance as a cathode material for lithium–sulfur batteries (LSBs). COF-F-SeS2 delivered a discharge capacity of 1633 mA h g−1 at 0.1C, an excellent C-rate performance of 1163 mA h g−1 at 1C and favorable long cycle performance. This work provides a feasible strategy to overcome the bottlenecks of LSBs for high capacity, excellent C-rate performance and enhanced cycle performance.

Graphical abstract: Chemical anchoring of SeS2 on a fluoro-substituted covalent organic framework as a high-performance cathode material

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Publication details

The article was received on 17 Aug 2019, accepted on 09 Oct 2019 and first published on 10 Oct 2019


Article type: Communication
DOI: 10.1039/C9CC06382J
Chem. Commun., 2019, Advance Article

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    Chemical anchoring of SeS2 on a fluoro-substituted covalent organic framework as a high-performance cathode material

    D. Wang, Y. Wang, M. Song, G. Kuang and K. Han, Chem. Commun., 2019, Advance Article , DOI: 10.1039/C9CC06382J

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