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Operando Characterization of Active Surface Area and Passivation Effects on Sulfur-Carbon Composites for Lithium-Sulfur Batteries

Li, He (author)
University of Southampton; North China Electric Power University
Lampkin, John (author)
University of Southampton
Chien, Yu-Chuan, 1990- (author)
Uppsala universitet,Strukturkemi
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Furness, Liam (author)
University of Southampton; The Faraday Institution, Harwell Campus, Didcot, United Kingdom
Brandell, Daniel, 1975- (author)
Uppsala universitet,Strukturkemi
Lacey, Matthew (author)
Uppsala universitet,Strukturkemi,Scania CV AB
Garcia-Araez, Nuria (author)
University of Southampton; The Faraday Institution, Harwell Campus, Didcot, United Kingdom
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 (creator_code:org_t)
Elsevier, 2022
2022
English.
In: Electrochimica Acta. - : Elsevier. - 0013-4686 .- 1873-3859. ; 403
Related links:
https://urn.kb.se/re...
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Sulfur electrodes for lithium-sulfur batteries necessarily contain a conductive additive,typically carbon, to enable the electrochemical reactions, since sulfur and the dischargeproduct, Li2S, are insulators. Consequently, the full passivation of carbon, by depositionof sulfur and/or Li2S, would necessarily produce the death of the battery. However, herewe demonstrate that for high-performance lithium-sulfur batteries operated under leanelectrolyte conditions (electrolyte to sulfur ratio of 6 µL mgS-1 in Li-S coin cells), theextent of passivation of carbon is not severe enough to limit performance. This is shownby performing impedance measurements of fully charged lithium-sulfur batteries, fromwhich we demonstrate that we can evaluate the specific surface area of carbon, and wefind that the capacity fade with cycling is not due to a decrease in the electrochemicallyactive specific surface area of carbon. These results show that introducing a higher sur-face area carbon in the sulfur electrode formulation is not needed to prevent passivation,and that the focus of lithium-sulfur development should be directed towards other is-sues, such as mitigating undesirable reactions at the lithium electrode and achievingrobust sulfur electrode structures enabling fast transport of electrolyte species and, thus,more homogeneous reactions.

Subject headings

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Publication and Content Type

ref (subject category)
art (subject category)

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