ORALS
SESSION: BatteryFriPM2-R11
| 6th Intl. Symp. on Sustainable Secondary Battery Manufacturing and Recycling |
Fri Oct, 25 2019 / Room: Coralino | |
Session Chairs: Katsuya Teshima; Deise Menezes Santos; Session Monitor: TBA |
17:10: [BatteryFriPM212]
Graphene-based lithium-sulfur batteries Liam
Bird1 ; Kai
Xi
1 ;
Cheng-yen
Lao1 ;
Vasant
Kumar1 ; Andrea
Ferrari
1 ; Caterina
Ducati
1 ;
1University of Cambridge, Cambridge, United Kingdom;
Paper Id: 453
[Abstract] Lithium-sulfur (Li-S) batteries have a theoretical capacity of 1675 mAhg<sup>-1</sup>[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.
References:
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5 S.-E. Cheon, et al., J. Electrochem. Soc. 150, A796 (2003)
6 A. Manthiram, et al., Chem. Rev. 114, 11751 (2014)
7 X. Ji, K. T. Lee, L. F. Nazar, Nat. Mater. 8, 500 (2009)
8 A. C. Ferrari, et al. Nanoscale, 11, 4598 (2015)
9 X. Zhou at al. J. Power Sources 243, 993 (2013)
10 P. G. Karagiannidis et al. ACS Nano 11, 2742 (2017)
17:35 Break