Oxygen Redox Reaction in Ionic Liquid and Ionic Liquid-like
Based Electrolytes: A Scanning Electrochemical Microscopy Study
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Posted on 2019-06-05 - 14:06
Improving
the stability of the cathode interface is one of the
critical issues for the development of high-performance Li/O2 batteries. The most critical feature to address is the development
of electrolytes that mitigate side reactions that bring about cathode
passivation. It is well-known that the superoxide anion (O2•–) plays a critical role. Here, we propose
scanning electrochemical microscopy (SECM) as an analytical tool to
screen the electrolyte of Li/O2 batteries. We demonstrate
that by using SECM it is possible to evaluate the stability of O2•– and of the cathode to the passivation
process occurring during the oxygen redox reaction. Specifically,
we report a study carried out at a glassy carbon electrode in 1-butyl-1-methylpyrrolidinium
bis(trifluoromethanesulfonyl)imide (PYR14TFSI) and lithium
bis(trifluoromethanesulfonyl)imide (LiTFSI) and in tetraethylene glycol
dimethyl ether with LiTFSI, the latter ranging from the salt-in-solvent
to solvent-in-salt regions.
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Ruggeri, Irene; Arbizzani, Catia; Rapino, Stefania; Soavi, Francesca (2019). Oxygen Redox Reaction in Ionic Liquid and Ionic Liquid-like
Based Electrolytes: A Scanning Electrochemical Microscopy Study. ACS Publications. Collection. https://doi.org/10.1021/acs.jpclett.9b00774