Ionogels with Carbon and Organic Polymer Matrices for Electrochemical Systems

Abstract

Ionogels (IGs) consisting of ionic liquids (ILs) confined in carbon and organic polymer matrices have recently emerged as promising materials for electrochemical systems. This perspective article explores how the structural, dynamic, and thermodynamic properties of ILs are modified by their confinement. It emphasizes the importance of combining various ILs and matrices to enhance IG properties through IL-matrix interactions. Specifically, it highlights the significant downshift of IL melting point observed in certain porous carbons, as well as the enhanced ionic conductivity at sub-ambient temperature in polymer networks. Accordingly, the suitability of these IGs for use in electrochemical systems operating at low temperature is discussed. Although significant progress has been made in the development and applications of carbon and polymer IGs, it is necessary to further explore the texture/structure of real host matrices, which may differ from model ones. Investigating the low-temperature mobility of ions in IG-based electrodes with micro/mesoporous carbons is an example of unexplored research area that may open new opportunities for increasing the energy and power density in energy storage applications. The suggested directions should facilitate innovative solutions to current and future challenges for electrochemical systems across a wide temperature range from −40 to 200 °C.