Supercapacitor, electrodes therefor, and method for preparing active material of electrodes

Abstract

The invention discloses a supercapacitor, electrodes therefor, and a method for preparing an active material of electrodes, and the method comprises the following steps: S1, sequentially placing a copper piece in hydrochloric acid and deionized water; S2, enabling the copper piece to be immersed in a mixed solution of NaOH and (NH4)2S2O8 till the color of the copper piece is changed into blue fromorange; S3, taking out the copper piece, and washing the copper piece through water and ethyl alcohol; S4, drying the copper piece, and obtaining a tubular copper hydroxide active material growing onthe surface of the copper piece. The method promotes the invertible redox reaction of the electrode, achieves the quick charging and discharging of the electrode, prevents the ineffective area from increasing after a binder is added to a conventional powder material, solves the problems that the loosening is liable to happen the thermal conductivity and electric conductivity are poor, and obtainsthe better circularity. Meanwhile, the method is simple, is low in cost, causes no pollution, is low in energy consumption, and is suitable for batch production.

Description

technical field [0001] The invention relates to a supercapacitor, in particular to a method for preparing a supercapacitor, an electrode thereof and an active material thereof. Background technique [0002] Supercapacitors, as one of the most promising energy storage devices, are widely used in hybrid electric vehicles, portable electronic devices, and energy systems due to their high energy density, fast charging, and good cycle stability. Supercapacitors can be divided into electric double layer supercapacitors without Faraday effect and Faradaic pseudocapacitor supercapacitors based on charge storage mechanism. Supercapacitors have a higher power density than batteries and a higher energy density than general capacitors due to the fast electron transfer rate and reversible charge transfer efficiency between the electrolyte and the active material interface. [0003] At present, oxides and metal hydroxide nanomaterials of transition metal elements, such as Ni, Co, Mn, Fe,...

AI Technical Summary

Problems solved by technology

Traditional materials generally need to be mixed with a binder and coated on the electrode, which increases the burden on the entire electrode, easily leads to invalid active area, is easy to fall off and increases internal resistance, and has low electrical conductivity, poor thermal conductivity, and poor cycle life. weakness

And considering that supercapacitor electrode active materials require relatively high electrical conductivity and electrochemical activity, one-dimensional nanostructured materials can obtain high electron transport rates in their longitudinal direction, but most nanomaterials are solid materials with fewer active sites. , the redox reaction rate is slow

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