Dissociation of a protic ethyl mercaptan cosolvent enables better magnesium electrochemistry reversibility

Abstract

The dissociation of a protic ethyl mercaptan (EM) cosolvent has been demonstrated for the first time as a fundamental causation to achieve improved magnesium (Mg) electro-chemistry reversibility in conventional electrolytes. The strong nucleophilic ethyl mercaptan anion (EM⁻) can easily squeeze into the first Mg²⁺ solvation sheath, regulating the weakly passivating interphase formation and guaranteeing uniform Mg electrodeposition.