Probing the Functionality of Halogen-Free Electrolytes Using Succinonitrile Additive in Magnesium-Sulfur Batteries

Abstract Rechargeable magnesium batteries have attractive features as a post-lithium battery owing to their high volumetric capacity, safety, and low cost. However, the charge density of Mg 2+ causes sluggish interfacial transfer kinetics at electrode/electrolyte interface. This paper is an attempt optimize electrochemical performance halogen-free liquid electrolyte (HFE)-based nitrate (Mg(NO 3 ) 2 variable additive succinonitrile (SN). A polymer layer interface (PLI) consisting (CF SO , polyvinylidene fluoride (PVDF), SN, G4 has been introduced isolate anode's surface from HFE in order reduce growth rate passivation anode. The introduction SN regulates ionic conductivity, overpotential plating/stripping, ion transference number HFE. prototype Mg/HFE_SN/S full cell delivers initial discharge/charge capacity ~ 1200/500 mAh g ?1 with rapid fade, while (Mg/PLI/HFE_SN/S) offers long cycle life over (Mg/HFE_SN/S) counterpart. Postmortem analysis sulfur electrodes different states reveals reversible back forth movement ions Mg/S cells via conversion reaction.