An electrolyte containing an ionic liquid and a supercapacitor

Abstract

An electrolyte containing an ionic liquid comprises an ionic liquid, a mixed organic solvent and a high-pressure stabilizer. An ionic liquid is an ionic liquid using tetrafluoroboric acid or bis (trifluoromethylsulfonimide) anion, a mixed organic solvent comprises cyclic carbonate and a low-viscosity solvent, the low-viscosity solvent is a chain solvent containing methoxy group in the terminal chain, and a high-pressure stabilizer is a fluoroester or an ether compound. The supercapacitor of that present invention includes a positive and negative electrode and an electrolyte as described above.The electrolyte containing ionic liquid has the advantages of low viscosity of an application chain compound containing a methoxy group at the end chain, the high viscosity defect of propylene carbonate and the ionic liquid is remedied, and the conductivity is improved; fluorinated esters or ether compounds are used to improve the oxidation resistance of electrolyte, improve the high voltage cyclestability of supercapacitors, and then enhance their specific energy. The supercapacitor has the advantages of high working voltage, high energy density, high power density, wide temperature adaptability and good safety performance.

Description

technical field The invention belongs to the technical field of new energy batteries, in particular to an electrolyte containing an ionic liquid, and also to a supercapacitor with the electrolyte. Background technique The rapid development of renewable energy technology in recent years has led to an urgent need for new devices for storing electrical energy. Supercapacitors are considered to be extremely promising due to their high power, fast charge and discharge, good stability, wide operating temperature range, and long cycle life. One of the most promising energy storage devices, although it has been widely used in the field of consumer electronics, its popularization and application is still limited in new markets such as electric vehicles and smart grids. The biggest challenge is the low energy density. Since the energy density of supercapacitors is proportional to the square of the operating voltage, which is mainly determined by the decomposition potential of the elec...

AI Technical Summary

Problems solved by technology

However, acetonitrile is volatile and highly toxic, and its use has been banned in many countries in Europe and the United States. However, the viscosity of propylene carbonate is still relatively high, which restricts the power density of supercapacitors, and the life of capacitors is poor.

Images