A kind of aqueous electrolyte and supercapacitor

Abstract

The present invention provides an aqueous electrolyte and a supercapacitor. The aqueous electrolyte includes glucose, water and inorganic salts. Compared with the prior art, in the present invention, glucose is added to the aqueous electrolyte using inorganic salt as electrolyte, and the freezing point of the obtained glucose-water-salt electrolyte is lower than the freezing point of the water-salt electrolyte, and it is not easy to freeze, so that it is difficult to freeze. The water-based electrolyte still has good electrochemical performance at a lower temperature, breaking through the limitation of using the water-based electrolyte under low temperature conditions; further, the present invention preferably uses sodium perchlorate as the electrolyte, so that the obtained water-based electrolyte The liquid has higher electrical conductivity, larger working temperature range and wider potential window, so that the aqueous electrolyte still has good performance under low temperature conditions; in addition, the present invention uses glucose as an antifreeze additive to reduce the freezing point of the aqueous electrolyte , Glucose is an environmentally friendly substance with a wide range of sources, cheap and easy to obtain.

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...

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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

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