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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

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Small-Molecule Additives Enhance Electric Double-Layer Performance in Ionic Liquids: Boosting Both Capacitance and

Chenmiao Zhao^1,2, Boning Wu¹, Tao Yang¹

¹State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

The Journal of Physical Chemistry Letters

|June 8, 2026

Summary

Adding small molecule additives to ionic liquids (ILs) significantly enhances supercapacitor performance. This breakthrough boosts capacitance and accelerates charging, paving the way for advanced energy storage solutions.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Supercapacitors are crucial for renewable energy storage.
Ionic liquids (ILs) are promising electrolytes for supercapacitors.
A key challenge is the trade-off between capacitance and charging rate.

Purpose of the Study:

To overcome the capacitance-charging rate trade-off in supercapacitors.
To enhance supercapacitor performance using ionic liquids with additives.
To investigate the impact of small-molecule additives on ionic liquid electrolytes.

Main Methods:

Utilized nanosecond time-resolved chronoamperometry.
Studied electric double-layer (EDL) formation.
Investigated mixtures of 1-alkyl-3-methylimidazolium tetrafluoroborate ILs with water, acetonitrile, and toluene.

Main Results:

Achieved up to a 16-fold increase in capacitance.
Observed a 4-fold reduction in charging time constants.
Demonstrated simultaneous enhancement of capacitance and charging dynamics.

Conclusions:

Incorporating trace small-molecule additives into ILs effectively boosts supercapacitor performance.
This approach enables ultrafast charging and high-density energy storage.
The findings support the development of next-generation supercapacitors.