Research data on advanced electrolytes for high-voltage supercapacitors

The research focuses on ionic liquids (ILs), deep eutectic solvents (DESs), and hybrid organic–ionic mixtures, with the aim of enhancing energy density, operating voltage, and safety. Data include cyclic voltammetry, galvanostatic charge–discharge, electrochemical impedance spectroscopy, molecular dynamics simulations, and operando characterizations (Raman, mass spectrometry, and FTIR).

The dataset covers charge storage mechanisms, ion transport dynamics, and interfacial processes in multi-scale porous carbon electrodes, using [N1114][NTf2], Na-based electrolytes, and TEABF4:PC as main electrolytes. Modeling results using the Modified Generic Electrochemical (MGE) model and equivalent-circuit analysis are also included. Altogether, the dataset supports a comprehensive understanding of the structure and property performance relationship of IL- and DES-based electrolytes, providing valuable insights for the design of safe, efficient, and sustainable next-generation supercapacitors.