Flexible self-supporting multifunctional interface AC-coated PVDF electrode material and preparation method and application thereof

An electrode material, self-supporting technology, applied in the fields of hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., can solve the problems of weakening the effect of active materials and increasing the weight of the device, and achieves the promotion of full contact, simple synthesis steps, and large area. The effect of specific capacitance

Pending Publication Date: 2022-07-08
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most activated carbon materials are in powder form. When making electrode sheets, the addition of binders or conductive agents not only increases the weight of the device, but also greatly weakens the effect of active materials.

Method used

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  • Flexible self-supporting multifunctional interface AC-coated PVDF electrode material and preparation method and application thereof
  • Flexible self-supporting multifunctional interface AC-coated PVDF electrode material and preparation method and application thereof
  • Flexible self-supporting multifunctional interface AC-coated PVDF electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0040] A preparation method of a flexible self-supporting multifunctional interface AC@PVDF electrode material, the method comprises the following steps:

[0041] (1) Fully mix and grind fluoropolymer and ZIF series metal-organic framework compounds, then mix with solvent, drop-coat and wrap around activated carbon cloth, and leave to dry; The ratio is (0.10-0.40)g:(10-40)mg:2cm 2 . The fluoropolymer includes PVDF or PTFE; the solvent includes N-methylpyrrolidone; the mass ratio of the fluoropolymer to ZIF is (8-12):1, preferably 10:1, and the mass ratio of the fluoropolymer to the solvent is 1:(4-10). The drying temperature is 100-150℃, and the standing time is 12-18h.

[0042]Among them, ZIF series metal organic framework compounds are prepared by the following method: dissolving 2-methylimidazole, nitrate and triethylamine in a solvent, after physical stirring reaction, washing, and drying to obtain ZIF series metal organic framework materials; nitrate; Including transi...

Embodiment 1

[0045] A flexible self-supporting multifunctional interface electrode material AC@PVDF 0.1 , its preparation method is as follows:

[0046] (1) 0.582g CO (NO 3 ) 2 ·6H 2 O was dissolved in 40 mL of distilled water, then 1.314 g of 2-methylimidazole and 3.2 g of triethylamine were dissolved in 40 mL of distilled water. The two solutions were then mixed with each other and stirred at room temperature for 6 h. The resulting precipitate was collected by centrifugation, washed three times with ethanol and distilled water respectively, and finally vacuum-dried at 80 °C for 12 h to obtain purple ZIF-67 powder.

[0047] (2) Cut out 1×2cm 2 The commercial carbon cloth was soaked in 20 mL of acetone and ultrasonicated for 3 hours, cleaned, and the carbon cloth was transferred to a hydrothermal kettle. With 30 mL of concentrated nitric acid, the above carbon cloth was hydrothermally treated at 90 °C for 5 hours to remove soluble impurities, washed, and dried at 60 °C. , to obtain ac...

Embodiment 2

[0057] The mass ratio of ZIF-67 to PVDF is fixed at 1:10. The difference between this example and Example 1 is that the feed quality is changed, and 0.4 g of PVDF is used to mix and grind 40 mg of purple ZIF-67 powder.

[0058] The resulting electrode material AC@PVDF 0.2 The charge transfer resistance is 0.618Ω and the internal resistance is 7.911Ω. The specific surface area is 388.8m 2 ·g -1 . The cyclic voltammetry curves are rectangular-like, indicating that the charge storage mechanism of the capacitor is dominated by the electric double layer capacitance. It can be seen from the calculation of the charge-discharge curve that in the three-electrode system, when the current density is 1 mA cm -2 , the area capacitance of this electrode material is 802.2mF cm -2 , with better electrochemical performance.

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Abstract

The invention discloses a flexible self-supporting multifunctional interface AC-coated PVDF composite electrode material (activated carbon cloth-coated polyvinylidene fluoride) and a preparation method and application of the flexible self-supporting multifunctional interface AC-coated PVDF composite electrode material. The preparation method comprises the following steps: mixing polyvinylidene fluoride (or polytetrafluoroethylene), a ZIF zeolite imidazole metal organic framework material and N-methyl pyrrolidone, sequentially performing uniform grinding, coating and wrapping on carbon cloth, and performing standing drying and high-temperature roasting to obtain the AC-coated PVDF carbon material with the multifunctional interface. As an electrode material, the multifunctional interface carbon material can be used for preparing a supercapacitor. Compared with the existing composite electrode material, the flexible self-supporting multifunctional interface AC (at) PVDF electrode substrate material prepared by the invention has excellent electrochemical performance and mechanical flexibility, and is an ideal material for preparing a high-performance flexible supercapacitor.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrode materials, in particular to a flexible self-supporting multifunctional interface AC@PVDF electrode material and a preparation method and application thereof. Background technique [0002] The rapid development of smart wearable and portable electronic products has greatly promoted the demand for energy storage devices with high energy density, light weight, portability and flexibility. As an important part of flexible energy storage devices, flexible supercapacitors have a series of advantages such as fast charge-discharge rate, high power density, and long cycle life, which have stood out among many flexible energy storage devices. Therefore, it is particularly important to design and develop flexible electrodes with excellent electrochemical performance. [0003] Supercapacitor equipment mainly includes outer packaging, current collectors, electrodes, electrolytes and separator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/86H01G11/26H01G11/32H01G11/30H01G11/24
CPCH01G11/34H01G11/86H01G11/26H01G11/32H01G11/30H01G11/24Y02E60/13
Inventor 郭建宇刘珍珍刘文博张斯勇鲁彦
Owner SHANGHAI NORMAL UNIVERSITY
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