Redox-active binary eutectics: Preparation and their electrochemical properties.

[Display omitted] • Redox-active binary eutectics with weak intermolecular interaction are synthesized. • Weakening intermolecular interaction leads to enhanced ionic conductivity. • The binary eutectic alone can be used as electrolyte that show good reversibility. Eutectics are emerging as promising candidate for electrochemical energy storage. However, the eutectics usually show high viscosity that usually arises from strong intermolecular interactions greatly limits their application. In this communication, we design and prepare two redox-active molecules that both are able to form binary eutectics with TBMA-TFSI. Combined experimental and computational studies indicate the intermolecular interaction is weakened after eutectic formation, resulting in decreased viscosity and enhanced ionization ratio of TBMA-TFSI without affecting the redox behaviors of the individual molecules. Further, the redox-active binary eutectic is used as solvent-free electrolyte for battery application. [ABSTRACT FROM AUTHOR]