Toward New Ion Conductive Liquids via Ionic Liquids

In the current era that it is strongly expected the SDGs would be achieved, electrolyte solutions in electrochemical devices and processes are being studied from dilute and concentrated solutions, through inorganic molten salts, deep eutectic solvents, and ionic liquids, to super-concentrated solutions. Although concepts based on empirical laws such as the Walden rule and hydrodynamics such as the Stokes rule are still useful for ionic conduction in solution, it is expected that superionic conduction-like mechanisms that are scarcely found in conventional electrolytes. Here, the authors ' recent results are described based on the local structure and speciation of ionic species in solution, focusing on protons and lithium ions.

Automated summary

This article introduces the study of electrolyte solutions in electrochemical devices and processes, ranging from dilute to concentrated solutions, inorganic molten salts, deep eutectic solvents, ionic liquids, and super-concentrated solutions. While empirical laws like the Walden rule and hydrodynamics like the Stokes rule are still useful for ionic conduction in solution, it is expected that new mechanisms, such as superionic conduction, will emerge in these unconventional electrolytes. The authors describe their recent results based on the local structure and speciation of ionic species in solution, with a focus on protons and lithium ions.