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  Differences in Electrochemistry between Fibrous SPAN and Fibrous S/C Cathodes Relevant to Cycle Stability and Capacity

Warneke, S., Eusterholz, M., Zenn, R., Hintennach, A., Dinnebier, R. E., & Buchmeiser, M. (2018). Differences in Electrochemistry between Fibrous SPAN and Fibrous S/C Cathodes Relevant to Cycle Stability and Capacity. Journal of The Electrochemical Society, 165(1), A6017-A6020.

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 Creators:
Warneke, S., Author
Eusterholz, M., Author
Zenn, R., Author
Hintennach, A., Author
Dinnebier, R. E.1, Author           
Buchmeiser, M., Author
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1Scientific Facility X-Ray Diffraction (Robert E. Dinnebier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370494              

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 Abstract: Two different Li/S cathodes are compared in terms of capacity (mA.h.g(sulfur)(-1)) and intermediates during discharge and charge. One cathode material is based on fibrous SPAN, a sulfur-containing material obtained via the thermal conversion of poly(acrylonitrile), PAN, in the presence of sulfur. In this material, sulfur is covalently bound to the polymeric backbone. The second cathode material is based on porous activated carbon fibers (ACFs) with elemental sulfur embedded inside the ACFs' micropores. Cyclic voltammetry clearly indicates different discharge and charge chemistry of the two materials. While S-containing ACFs show the expected redox-chemistry of sulfur, SPAN does not form long-chain polysulfides during discharge; instead, sulfide is chopped off the polymer-bound sulfur chains to directly form Li2S. The high reversibility of this process accounts for both the high cycle stability and capacity of SPAN-based cathode materials. (C) The Author(s) 2017. Published by ECS.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 736034
ISI: 000424887800008
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Title: Journal of The Electrochemical Society
Source Genre: Journal
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Pages: - Volume / Issue: 165 (1) Sequence Number: - Start / End Page: A6017 - A6020 Identifier: ISSN: 0013-4651