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Insight into Sulfur Confined in Ultramicroporous Carbon
M. Helen,
Thomas Diemant,
Stefan Schindler,
R. Jürgen Behm,
Michael Danzer,
Ute Kaiser,
Maximilian Fichtner,
M. Anji Reddy,
Anji Munnangi 
ACS Omega, Volume: 3, Issue: 9, Pages: 11290 - 11299
Swansea University Author:
Anji Munnangi
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DOI (Published version): 10.1021/acsomega.8b01681
Abstract
Here, we provide a deeper insight into the state of sulfur confined in ultramicroporous carbon (UMC) and clarify its electrochemical reaction mechanism with lithium by corroborating the results obtained using various experimental techniques, such as X-ray photoelectron spectroscopy, electron energy...
| Published in: | ACS Omega |
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| ISSN: | 2470-1343 2470-1343 |
| Published: |
2018
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa51586 |
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| Abstract: |
Here, we provide a deeper insight into the state of sulfur confined in ultramicroporous carbon (UMC) and clarify its electrochemical reaction mechanism with lithium by corroborating the results obtained using various experimental techniques, such as X-ray photoelectron spectroscopy, electron energy loss spectroscopy, in situ Raman spectroscopy, and in situ electrochemical impedance spectroscopy. In combination, these results indicate that sulfur in UMC exists as linear polymeric sulfur rather than smaller allotropes. The electrochemical reactivity of lithium with sulfur confined in UMC (pore size ≤0.7 nm) is different from that of sulfur confined in microporous carbon (≤2 nm, or ultramicroporous carbon containing significant amount of micropores) and mesoporous carbon (>2 nm). The observed quasi-solid-state reaction of lithium with sulfur in UMC with a single voltage plateau during the discharge/charge process is due to the effective separation of solvent molecules from the active material. The size of carbon pores plays a vital role in determining the reaction path of lithium with sulfur confined in UMC. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
9 |
| Start Page: |
11290 |
| End Page: |
11299 |