2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 12: Energy Production and Secondary Batterie

Editors:F. Kongoli, H. Dodds, M. Mauntz, T. Turna, K. Aifantis, A. Fox, V. Kumar
Publisher:Flogen Star OUTREACH
Publication Year:2019
Pages:112 pages
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Graphene-based lithium-sulfur batteries

    Liam Bird1; Kai Xi1; Cheng-Yen Lao1; Vasant Kumar1; Andrea Ferrari1; Caterina Ducati1;
    1UNIVERSITY OF CAMBRIDGE, Cambridge, United Kingdom;
    Type of Paper: Regular
    Id Paper: 453
    Topic: 14


    Lithium-sulfur (Li-S) batteries have a theoretical capacity of 1675 mAhg-1[1], five times that of conventional Li-ion batteries[2], facilitated by the sulfur cathode undergoing a series of redox reactions to form lithium polysulfides (PS)[3]. However, the continuous diffusion of PS through the electrolyte results in progressive loss of electrical contact to the active material and hence poor capacity retention with repeated cycling[4, 5]. A lightweight, electrically conductive host framework compatible with scalable manufacture is therefore required to exploit sulfur’s low cost and abundance[6] in batteries with sustained high capacity.
    Templated mesoporous carbons, including CMK-3, are electronically conductive and have a hierarchical porous structure suitable for constraining PS[7]. However, graphene and related materials (GRMs) are compatible with higher throughput manufacturing processes[8]. In addition to high conductivity[8], mechanical strength[8], and surface area, GRMs offer opportunities for tunable functionalisation to increase PS binding energy to the host framework[9].
    Here, we investigate the use of graphene nanoplatelets synthesised by microfluidization[10] (GNPs) and graphene oxide (GO) with CMK-3 as composite sulfur hosts for Li-S batteries. We find that a composite of GNPs and CMK-3 improves the capacity of Li-S batteries, and that a composite of GO and CMK-3 improves the capacity retention of batteries for the first ~100 cycles, compared to CMK-3 alone in identical conditions. The incorporation of GNPs appears to enhance the contribution of long-chain PS (Li2Sx for 4≤x≤8) to the cell’s capacity, demonstrating improved constraint of this active material in contact with the conducting host. This improves the cycling capability of Li-S batteries, facilitating their application in electric vehicles and grid-scale renewable energy storage.


    Cathodes; Characterisation; Electrochemistry; Energy; Graphene; Li-S; Lithium; Nanomaterials; SecondaryBattery;


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    Cite this article as:

    Bird L, Xi K, Lao C, Kumar V, Ferrari A, Ducati C. (2019). Graphene-based lithium-sulfur batteries. In F. Kongoli, H. Dodds, M. Mauntz, T. Turna, K. Aifantis, A. Fox, V. Kumar (Eds.), Sustainable Industrial Processing Summit SIPS2019 Volume 12: Energy Production and Secondary Batterie (pp. 53-54). Montreal, Canada: FLOGEN Star Outreach