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A kind of hierarchical porous carbon-based composite supercapacitor electrode material and preparation method thereof

A supercapacitor, hierarchical porous technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology for materials and surface science, etc., can solve poor conductivity, difficult to obtain specific surface area, ion absorption-desorption Attaching sufficient sites and other issues to achieve the effects of simple and convenient operation, large specific surface area, and wide applicability

Active Publication Date: 2022-03-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the closed internal structure of these fibers, it is difficult to obtain a large specific surface area and thus cannot provide enough sites for ion adsorption-desorption, which limits the improvement of the specific capacitance of the material.
Porous carbon materials derived from metal-organic framework materials have ultra-high specific surface area and rich pore structure, which can provide a large number of adsorption and desorption sites for ions, and can obtain high specific capacitance, but their poor conductivity will lead to active materials The effective utilization of the reduced, thus limiting the improvement of its high-rate performance

Method used

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  • A kind of hierarchical porous carbon-based composite supercapacitor electrode material and preparation method thereof
  • A kind of hierarchical porous carbon-based composite supercapacitor electrode material and preparation method thereof
  • A kind of hierarchical porous carbon-based composite supercapacitor electrode material and preparation method thereof

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preparation example Construction

[0030] A preparation method of a hierarchical porous carbon-based composite supercapacitor electrode material shown in an embodiment of the present invention, comprising:

[0031] S1. Preparation of metal-organic framework ZIF-67 nanoparticles;

[0032] S2, dissolving polyacrylonitrile (PAN) and pore-forming agent in the solvent, then adding the metal-organic framework ZIF-67 nanoparticles prepared in step S1, stirring and dispersing evenly to obtain a spinning solution, and then passing the spinning solution through electrostatic spinning to obtain nanocomposite fibers;

[0033] S3. Pre-oxidizing and carbonizing the nanocomposite fibers to obtain a hierarchical porous carbon-based composite supercapacitor electrode material.

[0034] In order to improve the capacitive performance of carbon materials in supercapacitors, a pore-forming agent is added to polyacrylonitrile, and electrospinning and heat treatment are used to prepare carbon materials with mesoporous pores, which i...

Embodiment 1

[0051] Step 1. Preparation of Metal Organic Framework ZIF-67 Nanoparticles

[0052] Weigh 2.91g of cobalt nitrate hexahydrate and dissolve in 125ml of methanol solvent to obtain solution A; dissolve 3.28g of 2-methylimidazole in 125ml of methanol solvent to obtain solution B; slowly mix solution A and solution B , fully stirred for 10 min, then stood still for 24 h, then centrifuged at 9000 r / min for 5 min, washed 3-5 times with absolute ethanol, and dried at 60°C for 12 h to obtain purple metal-organic framework ZIF-67 nanoparticles.

[0053] Step 2. Electrospinning experiment

[0054] Weigh 1g of PAN and 0.5g of PMMA and dissolve in 10mL of DMF, then add 0.05g of metal-organic framework ZIF-67 nanoparticles into the above solution and continue to stir for 12h to form a uniform spinning solution. Then, the spinning The solution was transferred to a 10mL syringe connected to a DC high-voltage power supply for electrospinning to obtain nanocomposite fibers. The electrospinning...

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Abstract

The application relates to a preparation method of a hierarchical porous carbon-based composite supercapacitor electrode material, comprising: S1, preparing metal-organic framework ZIF-67 nanoparticles; S2, dissolving polyacrylonitrile (PAN) and a pore-forming agent in a solvent, Then add the metal-organic framework ZIF‑67 nanoparticles prepared in step S1, stir and disperse evenly to obtain a spinning solution, and then electrospin the spinning solution to obtain nanocomposite fibers; S3, preoxidize and carbonize the nanocomposite fibers After treatment, a hierarchical porous carbon-based composite supercapacitor electrode material is obtained. The mesopores are left after the pore forming agent is carbonized and removed, and the microporous structure produced by the carbonization of ZIF‑67 forms a hierarchical porous structure. This unique hierarchical porous structure makes the material have a large specific surface area, high electrical conductivity, excellent specific capacitance and good Cyclic stability, and the preparation method is highly controllable, has wide applicability to materials, short process flow, simple and convenient operation, and is suitable for the controllable preparation of various carbon-based supercapacitor electrode materials.

Description

technical field [0001] The invention relates to a hierarchical porous carbon-based composite supercapacitor electrode material and a preparation method thereof, belonging to the field of supercapacitors. Background technique [0002] Supercapacitors, also known as supercapacitors or electrochemical capacitors, are a new type of green energy storage device between traditional capacitors and batteries. As a new type of green energy storage device, supercapacitors not only have much higher energy density than traditional capacitors, but also have higher power density than batteries. Moreover, supercapacitors have the advantages of short charging time, high charging and discharging rate, long cycle life, no memory effect, and basically no maintenance, etc., and are widely used in military, aerospace, national defense, communication equipment, and electric vehicles. [0003] Electrode materials are the most important components in supercapacitors. Today's research on electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/22D01F1/10H01G11/34H01G11/86H01G11/24H01G11/26H01G11/40B82Y40/00B82Y30/00
CPCD01F9/225D01F1/10H01G11/34H01G11/86H01G11/24H01G11/26H01G11/40B82Y40/00B82Y30/00Y02E60/13
Inventor 徐岚叶成伟刘福娟魏凯王萍
Owner SUZHOU UNIV