3-D vertically aligned few layer graphene--partially reduced graphene oxide/sulfur electrodes for high performance lithium--sulfur batteries

Singh, D.P, Soin, Navneet ORCID: 0000-0002-0196-2071, Sharma, S, Basak, S, Sachdeva, S, Roy, S.S, Zanderbergen, H.W, McLaughlin, J.A., Huijben, M and Wagemaker, M (2017) 3-D vertically aligned few layer graphene--partially reduced graphene oxide/sulfur electrodes for high performance lithium--sulfur batteries. Sustainable Energy & Fuels, 1 (7). pp. 1516-1523. ISSN 2398-4902

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Abstract

3-D vertically aligned few-layered graphene (FLGs) nanoflakes synthesised using microwave plasma enhanced chemical vapour deposition are melt-impregnated with partially reduced graphene oxide-sulfur (PrGO-S) nanocomposites for use in lithium–sulfur batteries. The aligned structure and the presence of interconnected micro voids/channels in the 3-D FLG/PrGO-S electrodes serves as template not only for the high sulfur loading (up to 80 wt%, areal loading of 1.2 mg cm−2) but also compensates for the volume changes occurring during charge–discharge cycles. The inter-connectivity of the electrode system further facilitates fast electronic and ionic transport pathways. Consequently, the binder-free 3-D FLG/PrGO-S electrodes display a high first-cycle capacity (1320 mA h g−1 at C/20), along with excellent rate capability of ∼830 mA h g−1 and 700 mA h g−1 at 2C and 5C rates, respectively. The residual functional groups of PrGO (–OH, –C–O–C– and –COOH) facilitate fast and reversible capture of Li+ ions while confining the polysulfide shuttles, thus, contributing to excellent cycling capability and retention capacity. The 3D electrodes demonstrate excellent capacity retention of ∼80% (1040 mA h g−1 at C/10) over 350 charge–discharge cycles. Comparatively, the 2-D planar PrGO-S electrodes displayed poor electronic conductivity and can only provide 560 mA h g−1 after 150 cycles, thereby further highlighting the vital role of the electrode morphology in improving the electrochemical performance of Li–S batteries.

Item Type: Article
Subjects: T Technology > T Technology (General)
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Dr Navneet Soin
Date Deposited: 28 Mar 2018 10:12
Last Modified: 28 Mar 2018 10:12
Identification Number: 10.1039/C7SE00195A
URI: http://ubir.bolton.ac.uk/id/eprint/1536

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