Open AccessPerspective—Electrochemical Stability of Water-in-Salt Electrolytes
Author(s) -
RubenSimon Kühnel,
David Reber,
Corsin Battaglia
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab7c6f
Subject(s) - electrolyte , electrochemistry , electrochemical window , salt (chemistry) , aqueous solution , electrochemical cell , cyclic voltammetry , materials science , chemical engineering , chemistry , inorganic chemistry , electrode , ionic conductivity , engineering , organic chemistry
The water-in-salt approach has expanded the electrochemical stability window of aqueous electrolytes, enabling novel aqueous batteries with relatively high cell voltages and energy densities. However, the stability of these electrolytes tends to be overestimated. The instability of the electrolyte is typically masked by high rates and a large excess amount of electrolyte present in lab cells. Based on a discussion of practical cells, we revisit voltammetry data and offer guidelines for a more stringent evaluation of electrochemical stability window data.