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

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.