Anion-Regulated Solvation Structure and Electrode Interface toward Rechargeable Magnesium Batteries
Duo Zhang, Miao Zhou, E. Sheha, Jiulin Wang, Jun Yang, Yanna NuLi
Abstract
Developing chlorine-free electrolytes enabling fast Mg 2+ transport through a solid/cathode-electrolyte interphase (SEI/CEI) remains critical for rechargeable magnesium batteries (RMBs). However, single-anion electrolytes often lack the necessary redox properties for this requirement. Here, we propose a dual-anion electrolyte combining magnesium bis(trifluoromethanesulfonyl)imide and 1-butyl-1-methylpiperidinium trifluoromethylsulfonate (PP 14 CF 3 SO 3 ) in diglyme and 2-methoxyethylamine (MOEA) solvent, achieving efficient Mg plating/stripping, cathode compatibility, and high anodic stability. The electrostatic interactions between MOEA and Mg 2+ /CF 3 SO 3 – stabilize the Mg-anode SEI while fostering C x N y -rich CEI formation. This leads to a significantly improved performance in Mg∥Mg and stainless steel (SS)∥Mg cells, with an extended lifespan over 2500 h and average Coulombic efficiency of 98.1%, respectively. Mo 6 S 8 ∥Mg full cells exhibit excellent rate performance, while poly(6,6′,6″-(benzene-1,3,5-triyl)tris(9,10-anthracenedione)) (PBAQ)∥Mg cells operate at 2.8 V (1 A g –1 ) with ∼70% capacity retention after 200 cycles. The work highlights anion-mediated solvation regulation, providing insights into advanced electrolyte engineering in high-performance RMBs.