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Self-supporting super capacitor electrode material and preparation method thereof

A technology for supercapacitors and electrode materials, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of limited loading, high preparation cost of carbon nanotubes, low utilization rate, etc., achieve high mechanical stability, and eliminate the need for electrodes. Preparation process, low cost effect

Active Publication Date: 2011-06-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, with MnO 2 With increasing loading, MnO 2 The specific capacitance is only one-tenth of the theoretical value
[0004] In recent years, researchers have developed a variety of nano-MnO with large specific surface area. 2 synthetic method, but its surface active sites are still difficult to fully utilize; for this reason, MnO 2 Combining with conductive materials (such as carbon nanotubes) can better solve the problem of MnO 2 The problem of low utilization rate, however, the preparation cost of carbon nanotubes is very high and MnO 2 Therefore, it is imminent to find a low-cost and high-efficiency compound preparation method

Method used

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  • Self-supporting super capacitor electrode material and preparation method thereof
  • Self-supporting super capacitor electrode material and preparation method thereof
  • Self-supporting super capacitor electrode material and preparation method thereof

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Embodiment 1

[0026] Embodiment 1: take a certain amount of polyacrylonitrile (PAN), add in dimethylformamide (DMF) solvent, be mixed with the PAN-DMF solution that mass fraction is 10wt.%, regulating voltage is 16kV, and receiving distance is 18 cm, the solution feed rate was 0.6 ml / h, and the solution was electrospun into a fiber mat. Heat the hot press to 100°C, put in the fiber mat and pressurize it to 5 MPa, then keep it warm for 5 minutes to obtain a tightly bonded fiber mat sheet. Then put the fiber felt sheet into a box-type atmosphere furnace, under the protection of nitrogen, heat it to 250°C and 1000°C at a heating rate of 5°C / min, and keep it warm for 2 hours for pre-oxidation and carbonization, respectively, to obtain carbon nanofiber sheets. Prepare a 0.1mol / L potassium permanganate solution, add concentrated sulfuric acid to adjust the solution to pH = 2, then soak the carbon nanofiber sheet prepared above in the solution for 15 minutes, take it out and wash it with deionized...

Embodiment 2

[0027] Embodiment 2: take a certain amount of polyvinyl alcohol (PVA), add deionized water, be mixed with the PVA aqueous solution that mass fraction is 15wt.%, regulating voltage is 18kV, and receiving distance is 18cm, and solution feed rate is 0.8ml / h, the solution was electrospun into a fiber mat. Then put the fiber mat sheet into a box-type atmosphere furnace, and under the protection of nitrogen, heat it to 1200°C at a heating rate of 5°C / min, keep it warm for 1.5h for carbonization, and obtain a carbon nanofiber sheet. Prepare a 0.25mol / L potassium permanganate solution, add concentrated nitric acid to adjust the solution to pH = 1, then soak the carbon nanofiber sheet prepared above in the solution for 20 minutes, take it out and wash it with deionized water and absolute ethanol several times to pH = 7, and then dried in a vacuum oven at 100°C for 8 hours to obtain MnO 2 and carbon nanofiber composite electrode materials. Calculation of MnO by weighing 2 The loadin...

Embodiment 3

[0028] Embodiment 3: Take by weighing a certain amount of polyvinylidene fluoride (PVDF) powder, add in the dimethylformamide (DMF) solvent, be mixed with the PVDF-DMF solution that mass fraction is 10wt.%, regulating voltage is 20kV, receives The solution was electrospun into a fiber mat at a distance of 15 cm and a solution feed rate of 0.5 ml / h. Then put the fiber felt sheet into a box-type atmosphere furnace, under the protection of nitrogen, heat it to 1100°C at a heating rate of 5°C / min, keep it warm for 2.5h for carbonization, and obtain carbon nanofiber sheet. Prepare a 0.05mol / L potassium permanganate solution, add concentrated sulfuric acid to adjust the solution to pH = 1, then soak the carbon nanofiber sheet prepared above in the solution for 10 minutes, take it out and wash it with deionized water and absolute ethanol several times to pH = 7, and then dried in a vacuum oven at 100°C for 8 hours to obtain MnO 2 and carbon nanofiber composite electrode materials. ...

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Abstract

The invention discloses a self-supporting super capacitor electrode material and a preparation method thereof, belonging to the field of super capacitor electrode materials. The method is characterized by preparing a nano-micro fiber felt from polymer solution through high-voltage electrospinning, carrying out hot pressing and carbonizing to obtain a carbon nano fiber felt, soaking the carbon nano fiber felt in potassium permanganate solution at a certain temperature for a period of time, then washing the sheet with deionized water and ethanol several times to remove impurities, and drying at 60-110 DEG C for 8-24 hours, thus obtaining the manganese dioxide and carbon nano fiber composite electrode material. The manganese dioxide and carbon nano fiber composite electrode material prepared by the method dispenses with extra current collectors, conductive additives and binders, can be directly used, and has the characteristics of high electrode mechanical stability, self current collection, high active substance loading, excellent electrochemical performance and the like.

Description

technical field [0001] The invention belongs to the field of supercapacitor electrode materials, and in particular relates to a self-supporting supercapacitor electrode material and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device between traditional flat capacitors and chemical power sources. It has the advantages of high power density, large capacity, fast charge and discharge, long cycle life, low pollution, and high reliability. It can reach the farad level, and has broad application prospects in mobile communications, information technology, power systems, electric vehicles, and aerospace. According to the energy storage mechanism, supercapacitors can be divided into electric double layer capacitors and pseudocapacitors. The former uses the electrostatic attraction between the electrode surface and the electrolyte to store energy. This type of electrode material is mainly a carbon-based material with a hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13Y02E60/12Y02E60/10
Inventor 杨颖王建淦黄正宏康飞宇
Owner TSINGHUA UNIV
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