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Design of a composite cathode and a graphene coated separator for a stable room-temperature aluminum–sulfur battery

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Abstract

Both aluminum and sulfur are promising materials for future-generation electrochemical energy storage technology owing to their natural abundance, low cost, and high capacity. However, a rechargeable aluminum–sulfur (Al–S) battery with high energy density suffers from poor reversibility and very short cycle life. Herein, a graphene/CoS2/sulfur composite cathode together with a reduced graphene oxide (rGO) coated separator are fabricated to improve the room-temperature Al–S battery performance. The rGO coating on the separator along with the composite cathode form a sandwich structure which effectively suppresses the diffusion of polysulfides and decreases the polarization of the battery. As a result, the Al–S battery gives a stable cycle life of 38 cycles with a high discharge capacity range of 676–1145 mA h g−1 at 50 mA g−1; the performance is greatly improved compared with the bare separator. Electrochemical, spectroscopic, and microscopic analyses illustrate the mechanism of electrochemical reactions in detail. These meaningful studies facilitate a remarkable step forward in the progress of Al–S batteries.

Graphical abstract: Design of a composite cathode and a graphene coated separator for a stable room-temperature aluminum–sulfur battery

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Publication details

The article was received on 06 Sep 2019, accepted on 19 Nov 2019 and first published on 20 Nov 2019


Article type: Paper
DOI: 10.1039/C9SE00762H
Sustainable Energy Fuels, 2020, Advance Article

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    Design of a composite cathode and a graphene coated separator for a stable room-temperature aluminum–sulfur battery

    X. Zheng, R. Tang, Y. Zhang, L. Ma, X. Wang, Y. Dong, G. Kong and L. Wei, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/C9SE00762H

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