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Soluble redox catalysts to enhance and relocate oxygen reduction and evolution in the lithium-air battery

Soluble redox catalysts to enhance and relocate oxygen reduction and evolution in the lithium-air battery
Soluble redox catalysts to enhance and relocate oxygen reduction and evolution in the lithium-air battery
Electrochemical oxygen reduction in a non-aqueous electrolyte often results in the deposition of an insoluble product on the electrode surface, thereby blocking access of oxygen to the surface for continued reaction. In the presence of a suitable redox shuttle such as viologen, oxygen reduction can occur homogeneously in solution near the air interface. This has the effect of displacing the oxygen reduction reaction some distance away from the electrode surface, which remains active to regenerate the reduced form of the shuttle. A further possibility is mediation of the oxygen reduction reaction in order to favour the formation of lithium peroxide rather than radical products that may degrade the electrolyte. Given a suitable shuttle reagent, this scheme may have several potential advantages, for example:

Avoidance of electrode passivation by insoluble lithium oxides

An increased, chemical driving force for oxygen adsorption into the electrolyte

Increased mass transfer to the electrode surface

Enhanced kinetics of lithium peroxide formation

Minimisation of side reactions that may degrade the electrolyte
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Frith, James T.
6f9df7da-00ca-4b23-b18c-b1f66d013250
Yang, L.
d733a460-fd35-457e-8fdd-da512cc302e7
Lodge, A.
2612eca4-d8bd-4029-9ccc-19a54c22619a
Richardson, W.
9ae3b706-3b58-4abc-9b1c-331acbb85979
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Frith, James T.
6f9df7da-00ca-4b23-b18c-b1f66d013250
Yang, L.
d733a460-fd35-457e-8fdd-da512cc302e7
Lodge, A.
2612eca4-d8bd-4029-9ccc-19a54c22619a
Richardson, W.
9ae3b706-3b58-4abc-9b1c-331acbb85979
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d

Garcia-Araez, Nuria, Frith, James T., Yang, L., Lodge, A., Richardson, W. and Owen, John R. (2014) Soluble redox catalysts to enhance and relocate oxygen reduction and evolution in the lithium-air battery. XXXV Meeting of Electrochemistry of the Spanish Royal Society of Chemistry, Burgos, Spain. 13 - 15 Jul 2014.

Record type: Conference or Workshop Item (Other)

Abstract

Electrochemical oxygen reduction in a non-aqueous electrolyte often results in the deposition of an insoluble product on the electrode surface, thereby blocking access of oxygen to the surface for continued reaction. In the presence of a suitable redox shuttle such as viologen, oxygen reduction can occur homogeneously in solution near the air interface. This has the effect of displacing the oxygen reduction reaction some distance away from the electrode surface, which remains active to regenerate the reduced form of the shuttle. A further possibility is mediation of the oxygen reduction reaction in order to favour the formation of lithium peroxide rather than radical products that may degrade the electrolyte. Given a suitable shuttle reagent, this scheme may have several potential advantages, for example:

Avoidance of electrode passivation by insoluble lithium oxides

An increased, chemical driving force for oxygen adsorption into the electrolyte

Increased mass transfer to the electrode surface

Enhanced kinetics of lithium peroxide formation

Minimisation of side reactions that may degrade the electrolyte

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More information

Published date: 14 July 2014
Venue - Dates: XXXV Meeting of Electrochemistry of the Spanish Royal Society of Chemistry, Burgos, Spain, 2014-07-13 - 2014-07-15
Organisations: Electrochemistry

Identifiers

Local EPrints ID: 371781
URI: http://eprints.soton.ac.uk/id/eprint/371781
PURE UUID: 14cc0a2b-910b-429f-837e-78dd6e58a16b
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379
ORCID for A. Lodge: ORCID iD orcid.org/0000-0001-5004-208X
ORCID for John R. Owen: ORCID iD orcid.org/0000-0002-4938-3693

Catalogue record

Date deposited: 17 Nov 2014 14:03
Last modified: 12 Dec 2021 03:58

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Contributors

Author: James T. Frith
Author: L. Yang
Author: A. Lodge ORCID iD
Author: W. Richardson
Author: John R. Owen ORCID iD

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