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Issue 46, 2018
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Building a cycle-stable sulphur cathode by tailoring its redox reaction into a solid-phase conversion mechanism

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Abstract

Sulphur has been actively investigated as a high capacity, naturally abundant and low cost cathode for next generation rechargeable lithium batteries. However, the poor cyclability and low capacity utilization of sulphur materials remain a great challenge for battery applications. To overcome this problem, we proposed a new strategy to convert the redox chemistry of sulphur cathodes from the dissolution–deposition mechanism to a solid-phase conversion (SPC) reaction by in situ formation of a thin and compact solid electrolyte interface (SEI) on the sulphur surface through a prompt nucleophilic reaction of soluble polysulfide intermediates with carbonate molecules specially designed as a co-solvent in the electrolyte. The such-formed SEI film can effectively block the penetration of the electrolyte but allows Li+ transport for electrochemical conversion, thus completely suppressing the generation and dissolution of polysulfide intermediates without sacrificing the two-electron redox capacity of sulphur. As a result, the S/C cathode in a VC/DME + DOL co-solvent electrolyte demonstrated a stable cycling capacity of ∼1100 mA h g−1 and a high capacity retention of 88% over 400 cycles with a coulombic efficiency of ∼100%, showing a prospect for battery application. More significantly, the strategy and method developed in this work may provide a new insight for future development of structurally and electrochemically stable sulphur cathodes for building practically viable Li–S batteries.

Graphical abstract: Building a cycle-stable sulphur cathode by tailoring its redox reaction into a solid-phase conversion mechanism

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Supplementary files

Article information


Submitted
22 Aug 2018
Accepted
19 Oct 2018
First published
20 Oct 2018

J. Mater. Chem. A, 2018,6, 23396-23407
Article type
Paper

Building a cycle-stable sulphur cathode by tailoring its redox reaction into a solid-phase conversion mechanism

F. He, X. Wu, J. Qian, Y. Cao, H. Yang, X. Ai and D. Xia, J. Mater. Chem. A, 2018, 6, 23396
DOI: 10.1039/C8TA08159J

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