ABSTRACT
Flexible and transparent energy storage devices have been widely used in smart windows and portable wearable devices. These devices possess advantages such as low cost, good optical transparency, and high electrochemical performance. This chapter discusses transparent electrolytes developed for lithium-ion batteries, supercapacitors, and fuel cells. All the new developments in electrolytes give an advanced path for lithium-ion batteries in the next generation of optoelectronics. Researchers have expressed interest in supercapacitors, also called electrochemical capacitors, because of their high power density, low maintenance cost, and long durability. The next generation devices require environmental friendly, safe, flexible, and transparent electrolytes. In the case of fuel cells, the electrolytic membrane should possess medium-range operating temperatures for many applications. Room temperature ionic liquids have attracted attention for a long time as effective electrolytes in the case of fuel cells.
