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Quantitative Galvanostatic Intermittent Titration Technique for the Analysis of a Model System with Applications in Lithium−Sulfur Batteries

Quantitative Galvanostatic Intermittent Titration Technique for the Analysis of a Model System with Applications in Lithium−Sulfur Batteries
Quantitative Galvanostatic Intermittent Titration Technique for the Analysis of a Model System with Applications in Lithium−Sulfur Batteries
Galvanostatic Intermittent Titration Technique (GITT) is a powerful characterization tool for batteries that provides key thermodynamic and kinetic information about battery performance. However, the quantitative analysis of GITT measurements of lithium-sulfur batteries has so far been limited to the evaluation of the internal resistance of the cell and the equilibrium voltage profiles. In this work, we provide the mathematical framework to characterize the mass transport kinetics in lithium-sulfur batteries from GITT data and we demonstrate the validity of the approach via the application to a model and well-behaved system, ethyl viologen, whose diffusion coefficient is corroborated by cyclic voltammetry. The present approach is also advantageous for the analysis of ion-insertion electrodes, where non-linearity of concentration and voltage changes would produce unrealistic evaluations of the diffusion coefficient by the classical analysis of GITT data.
445-454
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Dibden, James W.
932346ac-1cdb-43a5-add6-9279c73e4b5e
Meddings, Nina
3018b390-3284-4da0-a9c6-4be738803717
Owen, John
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Dibden, James W.
932346ac-1cdb-43a5-add6-9279c73e4b5e
Meddings, Nina
3018b390-3284-4da0-a9c6-4be738803717
Owen, John
067986ea-f3f3-4a83-bc87-7387cc5ac85d

Garcia-Araez, Nuria, Dibden, James W., Meddings, Nina and Owen, John (2018) Quantitative Galvanostatic Intermittent Titration Technique for the Analysis of a Model System with Applications in Lithium−Sulfur Batteries. ChemElectroChem, 5 (3), 445-454. (doi:10.1002/celc.201701004).

Record type: Article

Abstract

Galvanostatic Intermittent Titration Technique (GITT) is a powerful characterization tool for batteries that provides key thermodynamic and kinetic information about battery performance. However, the quantitative analysis of GITT measurements of lithium-sulfur batteries has so far been limited to the evaluation of the internal resistance of the cell and the equilibrium voltage profiles. In this work, we provide the mathematical framework to characterize the mass transport kinetics in lithium-sulfur batteries from GITT data and we demonstrate the validity of the approach via the application to a model and well-behaved system, ethyl viologen, whose diffusion coefficient is corroborated by cyclic voltammetry. The present approach is also advantageous for the analysis of ion-insertion electrodes, where non-linearity of concentration and voltage changes would produce unrealistic evaluations of the diffusion coefficient by the classical analysis of GITT data.

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GITTarticle-LiSM3-9b - Accepted Manuscript
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Accepted/In Press date: 15 November 2017
e-pub ahead of print date: 6 December 2017
Published date: February 2018

Identifiers

Local EPrints ID: 415686
URI: http://eprints.soton.ac.uk/id/eprint/415686
PURE UUID: 4d41528b-7895-4348-a98b-e5259d7dcdc9
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379
ORCID for Nina Meddings: ORCID iD orcid.org/0000-0001-7242-6076
ORCID for John Owen: ORCID iD orcid.org/0000-0002-4938-3693

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Date deposited: 20 Nov 2017 17:30
Last modified: 07 Oct 2020 05:03

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