Operando evaluation of selectivity and transference number of lithium-conductive membranes
Operando evaluation of selectivity and transference number of lithium-conductive membranes
Lithium selective membranes are important to prevent undesirable effects of electrodes’ cross‐talk in Li‐S and Li‐O2 cells, such as crossover of redox species from the cathode to the anode. This work reports a novel approach to evaluate their selectivity in‐operando, under practically relevant conditions, including application of a current through the membrane. The method is illustrated with a lithiated Nafion membrane, immersed in 1 molal LiTFSI in diglyme containing 0.1 molal LiI as a model crossover species, and an accurate evaluation of the transference number of crossover species is reported (t=0.0126 ±0.0018). It is also shown that the standard ex‐situ methods of evaluation of membrane selectivity, as applied without a current passing through the membrane, provide a considerable overestimation of the capability of the membrane to block crossover species.
1-6
Meddings, Nina
3018b390-3284-4da0-a9c6-4be738803717
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Meddings, Nina
3018b390-3284-4da0-a9c6-4be738803717
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Meddings, Nina, Owen, John R. and Garcia-Araez, Nuria
(2018)
Operando evaluation of selectivity and transference number of lithium-conductive membranes.
ChemElectroChem, .
(doi:10.1002/celc.201801372).
Abstract
Lithium selective membranes are important to prevent undesirable effects of electrodes’ cross‐talk in Li‐S and Li‐O2 cells, such as crossover of redox species from the cathode to the anode. This work reports a novel approach to evaluate their selectivity in‐operando, under practically relevant conditions, including application of a current through the membrane. The method is illustrated with a lithiated Nafion membrane, immersed in 1 molal LiTFSI in diglyme containing 0.1 molal LiI as a model crossover species, and an accurate evaluation of the transference number of crossover species is reported (t=0.0126 ±0.0018). It is also shown that the standard ex‐situ methods of evaluation of membrane selectivity, as applied without a current passing through the membrane, provide a considerable overestimation of the capability of the membrane to block crossover species.
Text
manuscript
- Accepted Manuscript
More information
Accepted/In Press date: 15 November 2018
e-pub ahead of print date: 14 December 2018
Identifiers
Local EPrints ID: 427080
URI: http://eprints.soton.ac.uk/id/eprint/427080
PURE UUID: e30399eb-45ae-4675-b770-dfd08b7f19ba
Catalogue record
Date deposited: 21 Dec 2018 16:30
Last modified: 16 Mar 2024 07:25
Export record
Altmetrics
Contributors
Author:
Nina Meddings
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics