Title
Unveiling the electronic properties of native solid electrolyte interphase layers on Mg metal electrodes using local electrochemistry
Author
Carla Santana Santos
Analytical Chemistry – Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum
Author
Martina Romio
Battery Technologies, Centre for Low-Emission Transport, AIT Austrian Institute of Technology GmbH
Author
Yuri Surace
Battery Technologies, Centre for Low-Emission Transport, AIT Austrian Institute of Technology GmbH
... show all
Abstract
Magnesium-ion batteries (MIBs) are of considerable interest as environmentally more sustainable, cheaper, and safer alternatives to Li-ion systems. However, spontaneous electrolyte decomposition occurs due to the low standard reduction potential of Mg, leading to the deposition of layers known as native solid electrolyte interphases (n-SEIs). These layers may inhibit the charge transfer (electrons and ions) and, therefore, reduce the specific power and cycle life of MIBs. We propose scanning electrochemical microscopy (SECM) as a microelectrochemical tool to locally quantify the electronic properties of n-SEIs for MIBs. These interphases are spontaneously formed upon contact of Mg metal disks with organoaluminate, organoborate, or bis(trifluoromethanesulfonyl)imide (TFSI)-based electrolyte solutions. Our results unveil increased local electronic and global ionic insulating properties of the n-SEI formed when using TFSI-based electrolytes, whereas a low electronically protecting character is observed with the organoaluminate solution, and the organoborate solution being in between them. Moreover, ex situ morphological and chemical characterization was performed on the Mg samples to support the results obtained by the SECM measurements. Differences in the electronic and ionic conductivities of n-SEIs perfectly correlate with their chemical compositions.
Object type
Language
English [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:2066516
Appeared in
Title
Chemical Science
Volume
14
Issue
36
ISSN
2041-6520
Issued
2023
From page
9923
To page
9932
Publisher
Royal Society of Chemistry (RSC)
Date issued
2023
Access rights
Rights statement
© 2023 The Author(s)
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