Circumneutral concentrated ammonium acetate solution as water-in-salt electrolyte

The exponentially growing market of electrochemical energy storage devices requires substitution of flammable, volatile, and toxic electrolytes. The use of Water in salt solutions (WiSE) regarded as green electrolyte might be of interest thanks to an association of key features such as high safety, low cost, wide electrochemical stability, and high ionic conductivity. Here, we report comprehensive chemical-physical study of circumneutral WiSE based on ammonium acetate so as to investigate application in electrochemical energy storage systems, with focus on the effect of pH, density, viscosity, conductivity, and the ESW with salt concentration ranging from 1 to 30 mol kg(-1). Data are reported and discussed with respect to the structure of the solutions investigated by complemental IR and molecular dynamic study. The study is addressed through the showcase of an asymmetric supercapacitor based on Argan shell-derived carbon electrodes tested at temperatures ranging from -10 to 80 degrees C. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The exponentially growing market of electrochemical energy storage devices necessitates the substitution of flammable, volatile, and toxic electrolytes. The use of Water in salt solutions (WiSE) as a green electrolyte with high safety, low cost, wide electrochemical stability, and high ionic conductivity is of interest. A comprehensive study on circumneutral WiSE based on ammonium acetate has been conducted, focusing on various properties and the effect of factors such as pH, density, viscosity, conductivity, and salt concentration on its performance.