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

A technology of nanotube compounding and manganese dioxide, which is applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of no investigation of electrochemical performance, achieve good electrochemical behavior, reduce internal resistance, and the effect of easy control of the reaction

Inactive Publication Date: 2010-12-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 struc

Method used

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

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Embodiment 1

[0025] Take commercial MWCNTs (length 500nm ~ 2μm, diameter 20 ~ 40nm) ultrasonic dispersion in deionized water for 30min, add saturated potassium permanganate solution, wherein the volume ratio of potassium permanganate and deionized water is 5:1, The content of carbon nanotubes in the solution is 0.04g / ml. Hydrochloric acid was added dropwise to adjust the pH value of the solution to 0. After ultrasonically assisted reaction at 70°C for 3h, it was placed in a polytetrafluoroethylene-lined hydrothermal kettle and reacted at 140°C for 2h. After natural cooling, the product was repeatedly washed with deionized water and absolute ethanol, suction filtered, and vacuum-dried at 80° C. for 24 hours to obtain a composite material of flap-shaped manganese dioxide nanocrystals coated with carbon nanotubes. Grind the above materials thoroughly in a ball mill, hot press at 80°C and 9MPa for 30 minutes to form an electrode on the foamed nickel, and use the Pt electrode as the counter ele...

Embodiment 2

[0027]Take commercial MWCNTs (length 500nm ~ 2μm, diameter 20 ~ 30nm) ultrasonic dispersion in deionized water for 30min, add saturated potassium permanganate solution, wherein the volume ratio of potassium permanganate and deionized water is 5:1, The content of carbon nanotubes in the solution is 0.03g / ml. Hydrochloric acid was added dropwise to adjust the pH value to 0. After ultrasonically assisted reaction at 70°C for 4h, it was placed in a polytetrafluoroethylene-lined hydrothermal kettle and reacted at 140°C for 4h. After natural cooling, the product was repeatedly washed with deionized water and absolute ethanol, suction filtered, and vacuum-dried at 80° C. for 24 hours to obtain a composite material of flap-shaped manganese dioxide nanocrystals coated with carbon nanotubes. The above materials are fully ground in a ball mill, hot-pressed at 80°C and 9MPa for 30 minutes to form an electrode on a nickel foam, and a Pt electrode is used as a counter electrode, Ag / AgCl is ...

Embodiment 3

[0029] Take commercial MWCNTs (length 500nm~2μm, diameter 10~20nm) and ultrasonically disperse them in deionized water for 30min, then add saturated potassium permanganate solution, wherein the volume ratio of potassium permanganate to deionized water is 5:1, The content of carbon nanotubes in the solution is 0.02g / ml. Hydrochloric acid was added dropwise to adjust the pH value to 0. After ultrasonically assisted reaction at 70°C for 6h, it was placed in a polytetrafluoroethylene-lined hydrothermal kettle and reacted at 160°C for 6h. After natural cooling, the product was repeatedly washed with deionized water and absolute ethanol, suction filtered, and vacuum-dried at 80° C. for 24 hours to obtain a composite material of leaf-shaped manganese dioxide nanocrystals coated with carbon nanotubes. The above materials are fully ground in a ball mill, hot-pressed at 80°C and 9MPa for 30 minutes to form an electrode on a nickel foam, and a Pt electrode is used as a counter electrode,...

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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...

Claims

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Application Information

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IPC IPC(8): H01G9/042
Inventor 秦宗益王凌凤唐月蔡雅萌骆洁妮
Owner DONGHUA UNIV
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