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Preparation method of integrated electrode composite material and flexible super capacitor

A composite material and supercapacitor technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of weak electrochemical performance, reduced device performance, large interface contact resistance, etc., to achieve good electrochemical performance, The effect of promoting the diffusion rate and accelerating the diffusion rate

Inactive Publication Date: 2020-04-10
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this CP composite has the following problems: first, due to the stiffness of the original wood, the flexibility of the cellulose mesh conductive composite is poor; second, the electrochemical performance is weak, mainly reflected in the electrical conductivity and specific The capacitance is poor, the main reason is: the electrochemical performance of only one conductive polymer PANI is relatively weak, and the lack of auxiliary materials improves each other. In addition, the loading of conductive active materials is relatively small, which affects the electrochemical performance of the device.
However, due to the presence of multiple interfaces between layers, the interlayer structure exhibits large interfacial contact resistance, which hinders the rapid transport of charges and ions from the cathode to the anode.
In addition, during continuous bending or stretching cycles, the relative displacement between different layers may lead to delamination of electrodes in flexible SCs, which will undoubtedly degrade the device performance.

Method used

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  • Preparation method of integrated electrode composite material and flexible super capacitor
  • Preparation method of integrated electrode composite material and flexible super capacitor
  • Preparation method of integrated electrode composite material and flexible super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take 2g of balsa wood sample (15×15×1mm) and soak it in 50mL of 2.5mol / L KOH aqueous solution, and place it at room temperature at 20-25°C for 12h. Then reflux at 90°C and stir for 3 hours to make the solution system heated evenly, so as to remove most of the hemicellulose and part of the lignin. The samples were then rinsed repeatedly with deionized water until pH=7. Put the treated sample into a 150mL Erlenmeyer flask, and add 65mL of deionized water, 0.5mL of glacial acetic acid, and 0.7g of sodium chlorite in sequence. Then, the mixture was heated at 75 °C for 1 h, and then 0.5 mL of glacial acetic acid and 0.7 g of sodium hypochlorite were added. Repeat the previous step 3 times to obtain a white, component-separated wood sample (white cellulose network block). The prepared samples were rinsed repeatedly with deionized water until pH = 7, and then stored in absolute ethanol for future use.

[0046] Vacuum impregnation of multi-walled carbon nanotubes (MWCNT) and...

Embodiment 2

[0048] The CPM composite material obtained in Example 1 was vacuum-immersed in the prepared gel electrolyte for 0.5 h. The gel electrolyte is a polyvinyl alcohol / phosphoric acid gel electrolyte prepared with a mass ratio of PVA: phosphoric acid: water = 1:1:10. Then take out the adhesion of the electrolyte, and coat the MWCNT on the surface of the CPM composite material, and the coating amount of the MWCNT is 0, 2.2, 4.4, 6.6mg / cm 2 , and the corresponding electrode samples were named CPM 0 、CPM 1 、CPM 2 、CPM 3 . in CPM X(CPM0、CPM1、CPM2、CPM3) The surface of the electrode sample is respectively bonded with two carbon cloths with gel electrolyte as a current collector, and various CPMs are assembled. X corresponding supercapacitors. After 3 cycles of freezing and thawing treatment, the freezing and thawing time of each cycle is 12 hours at -20°C and 3 hours at room temperature, and finally the different CPM based on the present invention is obtained. X Composite flexible...

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Abstract

The invention discloses a preparation method of an integrated electrode composite material. The method comprises the following steps of obtaining a porous cellulose network structure from wood, then filling a multi-walled carbon nanotube into the cellulose network structure, and carrying out aniline in-situ polymerization to obtain the cellulose network / multi-walled carbon nanotube / polyaniline integrated electrode composite material. According to the integrated flexible super capacitor prepared from the material, the area specific capacitance can reach 0.71 Fcm <-2 >, when the power density is15.67 mW / cm < 2 >, the energy density is 0.83 mWh / cm < 2 >, and the retention rate of the area specific capacitance can reach 103.24% after 10000 times of charging and discharging cycles, so that theelectrochemical performance of the flexible super capacitor is obviously superior to that of an existing biomass-based flexible super capacitor.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, more specifically, the invention relates to a preparation method of a cellulose network / multi-walled carbon nanotube / polyaniline integrated electrode composite material and an integrated electrode composite material prepared by using the composite material. A method for preparing flexible supercapacitors. Background technique [0002] Today's excessive consumption of fossil fuels and the ensuing environmental pollution force countries to seek advanced and sustainable new energy materials related to energy storage. Supercapacitors (SCs), as one of the most important energy storage devices, not only can store energy like conventional batteries, but also have ultra-high capacitance, high power density, fast charging, long life, good low-temperature performance and safety And other advantages, it has been widely used in electronic products, electric vehicles, milita...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/48H01G11/84H01G11/86C08G73/02
CPCC08G73/0266H01G11/24H01G11/30H01G11/36H01G11/48H01G11/84H01G11/86Y02E60/13
Inventor 程芳超柯少秋张凯农育红
Owner GUANGXI UNIV
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