Sodium-ion batteries: Charge storage mechanisms and recent advancements in diglyme-based electrolytes

Battery technologies beyond Li-ion batteries, especially sodium-ion batteries (SIBs), are being extensively explored with a view toward developing sustainable energy storage systems for grid-scale applications due to the abundance of Na, their cost-effectiveness, and operating voltages, which are comparable to those achieved using intercalation chemistries. The present review briefly introduces the importance of SIBs for sustainable applications and recent developments in their charge storage mechanisms. It discusses how electrolyte selection significantly impacts the electrochemical performances of SIBs and the need for further electrolyte development. In addition, we summarize recent developments in diglyme-based electrolytes as economical alternatives to conventional carbonate-based solvents in SIBs, and, finally, future perspectives regarding using diglyme-based solvents in electrochemical energy storage systems are discussed.