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Due to the hydrolytic instability of $LiPF_6$ in carbonate-based solvents, HFis a typical impurity in Li-ion battery electrolytes. HF significantlyinfluences the performance of Li-ion batteries, for example by impacting theformation of the solid electrolyte interphase at the anode and by affectingtransition metal dissolution at the cathode. Additionally, HF complicatesstudying fundamental interfacial electrochemistry of Li-ion batteryelectrolytes, such as direct anion reduction, because it iselectrocatalytically relatively unstable, resulting in LiF passivation layers.Methods to selectively remove ppm levels of HF from $LiPF_6$-containingcarbonate-based electrolytes are limited. We introduce and benchmark a simpleyet efficient electrochemical in situ method to selectively remove ppm amountsof HF from $LiPF_6$-containing carbonate-based electrolytes. The basic idea isthe application of a suitable potential to a high surface-area metallicelectrode upon which only HF reacts (electrocatalytically) while all otherelectrolyte components are unaffected under the respective conditions.

Electrochemical Removal of HF from Carbonate-based $LiPF_6$-containing Li-ion Battery Electrolytes