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Impact of compression on the electrochemical performance of the sulfur/carbon composite electrode in lithium–sulfur batteries

Impact of compression on the electrochemical performance of the sulfur/carbon composite electrode in lithium–sulfur batteries
Impact of compression on the electrochemical performance of the sulfur/carbon composite electrode in lithium–sulfur batteries

While lithium-sulfur batteries theoretically have both high gravimetric specific energy and volumetric energy density, only its specific energy has been experimentally demonstrated to surpass that of the state-of-the-art lithium-ion systems at cell level. One major reason for the unrealized energy density is the low capacity density of the highly porous sulfur/carbon composite as the positive electrode. In this work, mechanical compression at elevated temperature is demonstrated to be an effective method to increase the capacity density of the electrode by at least 90 % and moreover extends its cycle life. Distinct impacts of compression on the resistance profiles of electrodes with different thickness are investigated by tortuosity factors derived from both electrochemical impedance spectroscopy, X-ray computed tomography and kinetic analysis based on operando X-ray diffraction. The results highlights the importance of a homogeneous electrode structure highlight lithium-sulfur system.

X-ray computed tomography, compressed electrodes, electrode tortuosity, lithium-sulfur batteries, operando X-ray diffraction
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Chien, Yu-Chuan
6db11fcd-bb39-4404-8613-e49177154596
Li, He
1d46f87c-8509-43b9-9ee5-eb1065c4de0f
Lampkin, John
509a899a-1400-46e8-becd-4af728704bcf
Hall, Stephen
1423f899-50b5-41cc-b62b-10d1f53d69de
Brand, William
215954d3-61df-4e42-bfe0-3b31609d61f6
Brandell, Daniel
eafbc5bf-17cf-436a-a2b3-9b2973bbd7c8
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Chien, Yu-Chuan
6db11fcd-bb39-4404-8613-e49177154596
Li, He
1d46f87c-8509-43b9-9ee5-eb1065c4de0f
Lampkin, John
509a899a-1400-46e8-becd-4af728704bcf
Hall, Stephen
1423f899-50b5-41cc-b62b-10d1f53d69de
Brand, William
215954d3-61df-4e42-bfe0-3b31609d61f6
Brandell, Daniel
eafbc5bf-17cf-436a-a2b3-9b2973bbd7c8

Garcia-Araez, Nuria, Chien, Yu-Chuan, Li, He, Lampkin, John, Hall, Stephen, Brand, William and Brandell, Daniel (2022) Impact of compression on the electrochemical performance of the sulfur/carbon composite electrode in lithium–sulfur batteries. Batteries and Supercaps, 5 (7), [e202200058]. (doi:10.1002/batt.202200058).

Record type: Article

Abstract

While lithium-sulfur batteries theoretically have both high gravimetric specific energy and volumetric energy density, only its specific energy has been experimentally demonstrated to surpass that of the state-of-the-art lithium-ion systems at cell level. One major reason for the unrealized energy density is the low capacity density of the highly porous sulfur/carbon composite as the positive electrode. In this work, mechanical compression at elevated temperature is demonstrated to be an effective method to increase the capacity density of the electrode by at least 90 % and moreover extends its cycle life. Distinct impacts of compression on the resistance profiles of electrodes with different thickness are investigated by tortuosity factors derived from both electrochemical impedance spectroscopy, X-ray computed tomography and kinetic analysis based on operando X-ray diffraction. The results highlights the importance of a homogeneous electrode structure highlight lithium-sulfur system.

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More information

e-pub ahead of print date: 21 March 2022
Published date: July 2022
Additional Information: Funding Information: The authors acknowledge the STandUP for Energy consortium. Publisher Copyright: © 2022 The Authors. Batteries & Supercaps published by Wiley-VCH GmbH.
Keywords: X-ray computed tomography, compressed electrodes, electrode tortuosity, lithium-sulfur batteries, operando X-ray diffraction

Identifiers

Local EPrints ID: 456419
URI: http://eprints.soton.ac.uk/id/eprint/456419
PURE UUID: fe20c66b-c8bf-4e7a-9959-dce27acff36f
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379

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Date deposited: 28 Apr 2022 16:39
Last modified: 17 Mar 2024 03:31

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Contributors

Author: Yu-Chuan Chien
Author: He Li ORCID iD
Author: John Lampkin
Author: Stephen Hall
Author: William Brand
Author: Daniel Brandell

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