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Carbon-based supercapacitor based on polyacrylamide gel electrolyte and preparation method thereof

A polyacrylamide gel, supercapacitor technology, applied in electrolytic capacitors, capacitors, capacitor parts and other directions, can solve the problems of complex carbon aerogel synthesis process, high cost, small capacity, etc., and achieve good electrochemical capacitor performance. , the effect of wide window voltage range and high specific capacitance

Active Publication Date: 2009-09-09
上海纳晶科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Electrode materials are also an important factor in the performance of supercapacitors. At present, the electrode materials used at home and abroad, such as activated carbon, have high internal resistance, which requires a very complicated process to improve the conductivity, and the capacity is small; the synthesis process of carbon airgel Complex and costly; metal oxides are expensive and cause pollution, and carbon nanotubes, as a new type of nanomaterial, have good electrical conductivity, large specific surface area, good chemical inertness, and are suitable for electrolyte ion migration. Pores (pore size > 2nm) and intertwining can form a nanoscale network structure, which is considered to be an ideal electrode material for supercapacitors, especially high-power supercapacitors

Method used

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  • Carbon-based supercapacitor based on polyacrylamide gel electrolyte and preparation method thereof
  • Carbon-based supercapacitor based on polyacrylamide gel electrolyte and preparation method thereof
  • Carbon-based supercapacitor based on polyacrylamide gel electrolyte and preparation method thereof

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Embodiment 1

[0024] Preparation of carbon nanotube-carbon fiber composite electrode: Polish the nickel sheet with sandpaper, and then pretreat it with ultrasonic waves in acetone and water for 10 minutes respectively; then use low-pressure chemical vapor deposition equipment to grow carbon nanotube-carbon fiber film on the nickel sheet, The hydrogen flow rate is 100sccm and 50sccm respectively, the growth temperature is 550°C, and the growth time is 30 minutes. The nickel sheet with the carbon nanotube-carbon fiber film grown on it is used as the electrode of the supercapacitor, and its morphology is as follows figure 2 As shown, the carbon nanotubes and carbon fibers are intertwined to form a network structure, the density distribution is uniform, and the tube diameter is about 20-50nm;

[0025] The preparation process of polyacrylamide gel electrolyte and supercapacitor is as follows:

[0026] (1) Put the carbon nanotube-carbon fiber film electrode 2 into the polyvinyl alcohol PVA capac...

Embodiment 2

[0036] Preparation of carbon nanotube-carbon fiber composite electrode: After wiping the graphite sheet with water, acetone, and ethanol, pretreatment is carried out by drying at 70°C for 20 minutes to ensure that water and organic solvents do not remain; After sputtering a 20nm nickel catalyst on the graphite sheet by sputtering, the carbon nanotube-carbon fiber film was grown on the graphite sheet by low-pressure chemical vapor deposition equipment. During the growth, the flow rates of acetylene and hydrogen were 100 sccm and 100 sccm respectively, and the growth temperature was 550°C. The growth time is 30 minutes, and the graphite substrate after growing carbon nanotubes-carbon fibers is used as an electrode, and its morphology is as follows Figure 5 As shown, the carbon nanotubes and carbon fibers are intertwined to form a network structure, the density distribution is uniform, and the tube diameter is about 40-100nm.

[0037] The preparation process of polyacrylamide ge...

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Abstract

The invention relates to the supercapacitor technical field, in particular to a carbon-based supercapacitor based on polyacrylamide gel electrolyte and a preparation method thereof. The carbon-based supercapacitor mainly consists of a capacitor shell, and electrodes, diaphragms and electrolyte which are placed in the capacitor shell. The electrodes are carbon nanotube-carbon fiber composite material electrodes, the electrolyte is polyacrylamide gel, and the capacitor shell is made from any one of polyvinyl alcohol, polymethyl methacrylate, polycarbonate, polyvinyl chloride, polyethylene, polypropylene or polystyrene. Compared with the prior art, the electrochemical supercapacitor prepared by the method can be rapidly charged and discharged, and has the advantages of wide window voltage range, higher specific capacitance ranging from 20F / g to 50F / g and good electrochemical capacitor properties.

Description

[technical field] [0001] The invention relates to the technical field of supercapacitors, in particular to a carbon-based supercapacitor based on polyacrylamide gel electrolyte and a preparation method. [Background technique] [0002] Supercapacitors have the advantages of higher power density than traditional capacitors and higher power density than rechargeable batteries, and can be quickly charged and discharged, and have a long service life. It is a new, efficient and practical energy storage device with broad application prospects. The key to electrochemical supercapacitors lies in the selection of electrode and electrolyte materials. [0003] Gel electrolyte has become a current research hotspot due to its good contact with the electrode, no electrolyte leakage, and high specific energy. It overcomes, for example, the liquid electrolyte H 2 SO 4 and KOH and other defects such as strong corrosiveness, polluting the environment, easy gasification, and liquid leakage du...

Claims

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Application Information

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IPC IPC(8): H01G9/155H01G9/058H01G9/042H01G9/038H01G9/08H01G11/32H01G11/56
CPCH01G11/56Y02E60/13H01G11/36H01G11/70
Inventor 孙卓潘丽坤庞飞燕张燕萍林丽锋
Owner 上海纳晶科技有限公司
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