Computational Screening of the Physical Properties of Water-in-Salt Electrolytes

Trinidad Mendez‐morales , Trinidad Méndez-Morales (1, 2) , Zhujie Li (2, 1) , Mathieu Salanne (2, 1)

1 MDLS - Maison de la Simulation
2 PHENIX - PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX

Water-in-salts form a new family of electrolytes with properties distinct from the ones of conventional aqueous systems and ionic liquids. They are currently investigated for Li-ion batteries and supercapacitors applications, but to date most of the focus was put on the system based on the LiTFSI salt. Here we study the structure and the dynamics of a series of water-in-salts with different anions. They have a similar parent structure but they vary systematically through their symmetric/asymmetric feature and the length of the fluorocarbonated chains. The simulations allow to determine their tendency to nanosegregate, as well as their transport properties (viscosity, ionic conductivity, diffusion coefficients) and the amount of free water, providing useful data for potential applications in energy storage devices.

Mots clés: Li-ion batteries; supercapacitors; superconcentrated electrolytes; transport properties

Domaines: Micro et nanotechnologies/Microélectronique; Chimie; Physique [physics]

Trinidad Mendez‐morales, Trinidad Méndez-Morales, Zhujie Li, Mathieu Salanne. Computational Screening of the Physical Properties of Water-in-Salt Electrolytes. Batteries & Supercaps, 2020, ⟨10.1002/batt.202000237⟩. ⟨hal-03103513⟩