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In this manuscript, we report for the first time about the use of the glyoxylic‐acetals‐based electrolytes in combination with graphite electrodes. We showed that these innovative electrolytes display good viscosities and conductivities, as well as higher thermal stability and flash points compared to the electrolyte based on conventional solvents. Additionally, they display intrinsic film‐forming ability and they can be successfully used in combination with graphite electrodes.

In this work we report the use of the aprotic ionic liquid (AIL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr 14 TFSI) and the protic ionic liquid (PIL) 1-butylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr H4 TFSI) in view of the realization of potassium ion batteries. Physicochemical characterization of electrolytes reveals features comparable to those obtained for lithium and sodium ion technologies. Electrochemical performance is evaluated in combination with olive pits derived hard carbon electrodes with and without a film-forming additive at room temperature and at 60°C. Similar to our previous study, the use of Pyr H4 TFSI is not applicable due to the lack of electrochemical stability below 2 V vs. K + /K, while reversible K + insertion/deinsertion is demonstrated for Pyr 14 TFSI. Electrochemical impedance spectroscopy and post-mortem analysis reveal an unstable formation of the solid electrolyte interphase within the HC electrode.

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