Deeping Insight of Weakly Solvating Halogen-Free Electrolyte in Enhancing the Electrochemical Performance of Magnesium-Sulfur Batteries.

Magnesium-sulfur (Mg-S) batteries offer a promising energy storage system due to their high theoretical capacity. However, the sluggish conversion reaction kinetics and the shuttle effect of magnesium polysulfides hinder their practical application. The high charge density of the divalent Mg cations leads to slow kinetics caused by significant electrostatic interactions between Mg and its surrounding solvent and anion species.

Life Aging Effect as a Conditioning Process that Regulates the Performance of the Halogen-Free Mg Electrolyte.

Studying the interplay between the electrochemical performance and the electrolyte conditioning process is crucial for building an efficient magnesium battery. In this work, we use halogen-free electrolyte (HFE) based on Mg(NO) in acetonitrile (ACN) and tetraethylene glycol dimethyl ether (G4) to study the effect of the aging time calendar on its electrochemical properties. The characterization techniques confirm apparent changes occurring in the bulk speciation and the Mg solvation barrier of the aging HFE relative to the as-prepared fresh HFE.

Probing the effect of ethylene carbonate on optimizing the halogen-free electrolyte performance for Mg sulfur batteries.

Magnesium metal batteries attract great attention for their high volumetric capacity and safety as a post-lithium choice. The strategy of adding organic plasticizer may bring new insights into designing halogen-free electrolytes for the further development of magnesium-sulfur batteries. The high charge density of Mg results in a high desolvation barrier and low interfacial Mg transfer kinetics due to the strong coulombic interactions of Mg ions with anions and solvent molecules.