Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.364
Publication date: 18th July 2023
Increasing the operating voltage of batteries brings additional challenges to the electrolyte, as it should be stable at higher potentials. Therefore, investigating the electrochemical stability window (ESW) of electrolytes is extremely important. While this could be considered an easy task with liquid electrolytes because mass transport limitation is seldom an issue, it is more complicated with solid polymer electrolytes. Common techniques used are cyclic voltammetry (CV) and linear sweep voltammetry (LSV). However, the main drawback of these methods is that the electrochemical stability of electrolytes is often arbitrarily determined and using conditions far from realistic. Therefore, alternative or complementary methods are required.
Herein, we investigate alternative techniques to determine the oxidative stability of solid polymer electrolytes. Staircase voltammetry (SV) is used to avoid the mass transport limitation and it is combined with electrochemical impedance spectroscopy to simultaneously detect changes in resistance and interfacial degradation. Synthetic charge–discharge profile voltammetry (SCPV) is used to apply the real voltage profile of the active material of interest. Finally, to include the effect of the active material, cut-off increase cell cycling method (CICC) has been developed where the upper cut-off voltage is gradually increased up to 5 V. Monitoring the voltage profile and the Coulombic efficiency can provide information of side reactions occurring at different voltages. The feasibility of these different methods has been investigated with two model solid polymer electrolytes: poly(ethylene oxide) and poly(trimethylene carbonate).[1]
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