Information from the abstract
Abstract Fluorine-free electrolytes are increasingly pursued for sodium-ion batteries (SIBs) to mitigate environmental and safety concerns associated with per- and polyfluoroalkyl substance (PFAS)-containing salts. However, the molecular mechanisms governing ion transport in sodium perchlorate (NaClO4)-based electrolytes remain insufficiently understood. Here, classical molecular dynamics (MD) simulations were employed to investigate how carbonate cosolvents influence solvation structure and ion association in 1 M NaClO4 electrolytes. Three solvent systems were examined: pure diglyme (G2), G2/propylene carbonate (PC), and G2/vinylene carbonate (VC). The simulations show that G2 strongly coordinates Na+ and promotes extensive ion association, dominated by multi-ion aggregates, resulting in limited ionic mobility. Incorporation of VC increases ionic conductivity (5.89 → 20.48 mS/cm, Nernst–Einstein estimate), whereas PC produces moderate enhancement. Structural analyses reveal that VC does not enter the primary Na+ solvation shell. Instead, it increases the dielectric screening of the electrolyte and weakens Na+–ClO4– electrostatic interactions. This reduction in ion association promotes ion dissociation and facilitates faster solvent exchange dynamics, thereby improving Na+ transport. These results indicate that dielectric modulation of ion–anion interactions, rather than changes in the primary solvation structure, plays a key role in governing ion transport in NaClO4-based fluorine-free electrolytes. The findings provide molecular-level insights into the role of cosolvent dielectric properties in regulating ion association and highlight the utility of molecular simulations for understanding electrolyte behavior.
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Related topics: Advanced Battery Materials and Technologies · Ionic liquids properties and applications · Material Dynamics and Properties
Thai researcher and institutional participation
Phitchapa Ausamanwet Zijdemans · Ali Hassan · Soorathep Kheawhom · Manaswee Suttipong · Chulalongkorn University
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