Preparation method of composite electrode material using flap-like manganese dioxide nanocrystal to coat carbon nanotubes

Abstract

The invention relates to a preparation method of a composite electrode material using flap-like manganese dioxide nanocrystal to coat carbon nanotubes, comprising the following steps: (1) dispersing MWCNTs to a saturated potassium permanganate solution, dropwise adding strong acid to adjust the pH value of the solution to 0-1, performing ultrasonic processing at 60-80 DEG C for 3-10h; (2) allowing the solution to react at 120-180 DEG C for 1-10h, naturally cooling; (3) performing repeated washing, suction filtering and vacuum drying the product obtained in step (2); and (4) pressing the composite product on a nickel screen to manufacture the electrode of a super capacitor. In the invention, the types of required chemicals are few, the cost is low, the reaction is easy to control, the operation is convenient and the process is simple. The obtained carbon nanotube coated by flap-like manganese dioxide nanocrystal has a CV curve with obvious rectangular characteristic when being used as the electrode of a superior capacitor, and has higher specific capacitance and good stability of electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation of high-performance electrode materials for supercapacitors, in particular to a preparation method of a petal-shaped manganese dioxide nanocrystal-coated carbon nanotube composite electrode material. Background technique [0002] Electrochemical supercapacitor is an emerging energy storage device between traditional capacitors and chemical power sources. It has higher energy density than traditional capacitors and higher power density than batteries, and has broad application prospects. with RuO 2 Electrochemical capacitors with noble metal oxides as electrode materials have been used in many fields because of their higher specific capacitance than electric double layer capacitors, but their high cost limits their wide application. Some cheap metal oxides like NiO and MnO 2 etc. also have redox quasi-capacitance, where MnO 2 It has the characteristics of high theoretical specific capacity, abundant r...

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Problems solved by technology

Zhang Xiaobin and others from Zhejiang University used the chemical precipitation method to realize the composite of carbon nanotubes grafted with hydrophilic groups on the surface and manganese dioxide to prepare a composite material with a core-shell structure (CN101173117A). The disadvantage is that the carbon nanotubes used The tube needs to be ultrasonically pretreated in a mixed acid, and a surfactant needs to be added to the reaction system, and its electrochemical performance has not been investigated.

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