Aqueous electrolyte and super-capacitor

Abstract

The invention provides an aqueous electrolyte and a super-capacitor. The aqueous electrolyte comprises glucose, water and an inorganic salt. Compared with the prior art, the glucose is added to the aqueous electrolyte taking the inorganic salt as an electrolyte, a solidifying point of the acquired glucose-water-salt electrolyte is relatively lower than that of a water-salt electrolyte, and the glucose-water-salt electrolyte is difficult to freeze and has good electrochemical performance at a relatively low temperature, so that using restrictions of the aqueous electrolyte at low temperature conditions are broken through. Furthermore, sodium perchlorate is selected preferably to act as the electrolyte, so that the acquired aqueous electrolyte is enabled to have higher electric conductivity, a wider working temperature range and a wider potential window, and the aqueous electrolyte is enabled to still have good performance under the low temperature conditions. In addition, the glucose is taken as an anti-freeze additive, so that the solidifying point of the aqueous electrolyte is reduced. The glucose is an environment-friendly substance, and is wide in source, cheap and easy to get.

Description

technical field [0001] The invention belongs to the technical field of electric double layer capacitors, in particular to an aqueous electrolyte and a supercapacitor. Background technique [0002] With the development of society, people's demand for sustainable and clean energy is becoming more and more urgent. Electrochemical supercapacitors, also called supercapacitors, are energy storage components based on the electrochemical reaction process at the electrode / solution interface. The capacity of electrochemical supercapacitors is 20 to 200 times that of traditional capacitors, which can reach farad level or even thousand farad level. It has both the advantages of high power density of conventional capacitors and high energy density of rechargeable batteries, and is considered to be an efficient and practical new energy source. [0003] Supercapacitors can be divided into two categories according to the energy storage mechanism: capacitors using activated carbon with hig...

AI Technical Summary

Problems solved by technology

However, the temperature range from the freezing point to the boiling point of water in the aqueous electrolyte is small, which makes the operating temperature range of the supercapacitor small and easy to freeze

At the same time, because the solubility of most electrolytes in water decreases with the decrease of temperature, at low temperature, the electrolyte in the aqueous electrolyte will continue to precipitate, and the concentration of the electrolyte will decrease, resulting in a decrease in the conductivity of the electrolyte, and the electrolyte cannot be kept at room temperature. Good electrochemical properties, which affect the performance of the capacitor, and even make the capacitor unusable

Images