In a recent article in Nature Materials, from a collaboration with MIT (USA), Bristol (UK) and Perth (Australia) we describe the discovery of a new class of electrolytes, which can improve energy storage efficiency in supercapacitors. These detergent-like ionic liquids can self-assemble into sandwich-like bilayer structures on electrode surfaces. And that is very reason why they give better energy storage performance.
Check the manuscript at Nat. Mat. (2019) DOI: 10.1038/s41563-019-0449-6