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Facilitating charge reactions in Al-S batteries with redox mediators

Facilitating charge reactions in Al-S batteries with redox mediators
Facilitating charge reactions in Al-S batteries with redox mediators
The Al-S battery is a promising next-generation battery candidate due to high abundance of both aluminium and sulfur. However, the sluggish kinetics of the Al-S battery reactions produces very high overpotentials. Here we demonstrate, for the first time, that the incorporation of redox mediators can dramatically improve the kinetics of Al-S batteries. On the example of iodide redox mediators, we show that the charging voltage of Al-S batteries can be decreased by ca. 0.23 V with as little as 2.3 wt.% of redox mediator added as electrolyte additive. Control electrochemical measurements, without prior discharge of the battery, demonstrate that >97 % of the charge capacity is due to the desired oxidation of Al 2 S 3 , and XRD experiments confirm the formation of sulfur as the final charge product. The beneficial role of redox mediators is demonstrated with cheap and environmentally friendly electrolytes made of urea and AlCl 3 . This work shows that dramatic performance improvements can be achieved with low concentration of electrolyte additives, and therefore, much further performance improvements could be sought by combining multiple additives.
Aluminium-Sulfur Batteries, Beyond Li-ion Batteries, Deep-Eutectic Solvents, Redox Mediators, batteries, energy storage, aluminium-sulfur batteries, redox mediators, deep eutectic solvents
1864-5631
3139-3146
Li, He
1d46f87c-8509-43b9-9ee5-eb1065c4de0f
Lampkin, John
509a899a-1400-46e8-becd-4af728704bcf
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Li, He
1d46f87c-8509-43b9-9ee5-eb1065c4de0f
Lampkin, John
509a899a-1400-46e8-becd-4af728704bcf
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37

Li, He, Lampkin, John and Garcia-Araez, Nuria (2021) Facilitating charge reactions in Al-S batteries with redox mediators. ChemSusChem, 14 (15), 3139-3146. (doi:10.1002/cssc.202100973).

Record type: Article

Abstract

The Al-S battery is a promising next-generation battery candidate due to high abundance of both aluminium and sulfur. However, the sluggish kinetics of the Al-S battery reactions produces very high overpotentials. Here we demonstrate, for the first time, that the incorporation of redox mediators can dramatically improve the kinetics of Al-S batteries. On the example of iodide redox mediators, we show that the charging voltage of Al-S batteries can be decreased by ca. 0.23 V with as little as 2.3 wt.% of redox mediator added as electrolyte additive. Control electrochemical measurements, without prior discharge of the battery, demonstrate that >97 % of the charge capacity is due to the desired oxidation of Al 2 S 3 , and XRD experiments confirm the formation of sulfur as the final charge product. The beneficial role of redox mediators is demonstrated with cheap and environmentally friendly electrolytes made of urea and AlCl 3 . This work shows that dramatic performance improvements can be achieved with low concentration of electrolyte additives, and therefore, much further performance improvements could be sought by combining multiple additives.

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More information

Accepted/In Press date: 6 April 2021
e-pub ahead of print date: 28 April 2021
Published date: 9 August 2021
Keywords: Aluminium-Sulfur Batteries, Beyond Li-ion Batteries, Deep-Eutectic Solvents, Redox Mediators, batteries, energy storage, aluminium-sulfur batteries, redox mediators, deep eutectic solvents

Identifiers

Local EPrints ID: 449892
URI: http://eprints.soton.ac.uk/id/eprint/449892
ISSN: 1864-5631
PURE UUID: 72fc38dc-2f43-41d9-b919-ac25f4b119b1
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379

Catalogue record

Date deposited: 23 Jun 2021 16:33
Last modified: 28 Apr 2022 02:08

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Contributors

Author: He Li ORCID iD
Author: John Lampkin

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