Composite thin film for flexible electrode and preparation method thereof

A composite film and flexible graphite technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of unsatisfactory energy storage characteristics, low energy density, and poor rate performance of all-solid-state flexible supercapacitors. problem, to achieve the effect of no aggregation, excellent electrical conductivity, and good rate performance.

Active Publication Date: 2018-12-07
SHENZHEN KANGSHENG PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the energy storage characteristics of most of the currently developed all-solid-state flexible supercapacitors are still unsatisfactory, such as the specific capacitance is still small, the energy density is still not high, and the rate performance is relatively poor.

Method used

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  • Composite thin film for flexible electrode and preparation method thereof
  • Composite thin film for flexible electrode and preparation method thereof
  • Composite thin film for flexible electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The method provided by the invention is used to prepare cellulose / graphene / silver nanoparticle composite film:

[0061] (1) Cut 180mg filter paper into pieces and mix with 300mL 0.6mg mL -1 Add the graphene oxide aqueous dispersion to the cooking machine together, start the cooking machine, make the rotor rotate at a speed of about 30,000 rpm and stir for 4 minutes, and then break the filter paper to make cellulose fiber + graphene oxide slurry material.

[0062] (2) Transfer the mixed slurry in step (1) to a beaker, add 60 mL of freshly prepared silver ammonia solution with a concentration of 0.15 M under rapid magnetic stirring, then raise the temperature to 85° C. and react for 30 min. During this process, the silver-ammonia complex was reduced by graphene oxide into silver nanoparticles, and at the same time, the recombination of each component was induced to generate a cellulose / graphene oxide / silver nanoparticle composite.

[0063] (3) The product of step (2) is...

Embodiment 2

[0069] The method provided by the present invention is used to construct a symmetrical all-solid-state flexible supercapacitor [cellulose / graphene / silver nanoparticles / / cellulose / graphene / silver nanoparticles]:

[0070] (1) Add 5g of polyvinyl alcohol to 50mL of water, raise the temperature to 90°C, and stir to dissolve it at the same time. Then slowly drop 2mL 1g mL under stirring -1 The aqueous solution of potassium chloride was naturally cooled to room temperature to obtain a clear and transparent polyvinyl alcohol / potassium chloride gel electrolyte.

[0071] (2) The cellulose / graphene / silver nanoparticle composite film synthesized in embodiment 1 is cut into 0.5cm * 3cm rectangular strip, placed on the glass slide, then a small amount of polyvinyl alcohol / graphene in step (1) / Potassium chloride gel electrolyte is poured on its surface, covering an area of ​​0.5cm×2cm, that is, leaving a blank area of ​​0.5cm×1cm for connecting with the electrode clip, and then letting th...

Embodiment 3-5

[0078] Embodiment 3-5: Carried out according to the steps and parameters in Table 1 below, and the others are the same as in Embodiment 1.

[0079]

[0080] The composite film and the flexible capacitor obtained by the above embodiments 3-5 still have the above-mentioned technical effects of the present invention.

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Abstract

A flexible graphene-based conductive composite thin film is disclosed. The composite thin film is composed of cellulose fibers, graphene and silver nanoparticles; the surface layer structure is a continuous silver nanoparticle film formed by mutually stacking silver nanoparticles, and the interior is composed of cellulose, graphene and silver nanoparticles. The cellulose fibers are skeletons, andthe inner silver nanoparticles are wrapped by graphene. The cellulose fiber-graphene-silver nanoparticle composite thin film of the structure has excellent conductivity with the square resistance being only 0.17 [omega]sq<-1>, and has excellent electrochemical performance; the maximum area specific capacitance is up to 1242.7 mF cm<-2>, and the rate performance is good; there is almost no loss ofcapacitance (the capacitance retention rate can still reach 99.7%) after 6000 times of repeated charge and discharge under the high current density of 60 mA cm<-2>, showing excellent the stability ofrepeated charge and discharge; and the energy density is high and the specific capacitance area is large.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a flexible graphene conductive composite film and a preparation method thereof. Background technique [0002] The market has urgent needs and expectations for a new generation of flexible and portable electronic products such as wearable devices, rollable displays, foldable smartphones, implantable medical chips, electronic skins, etc. The current energy supply and energy storage electronic devices appear to be too much Heavy, too thick, too large, it is difficult to meet the requirements of this emerging field. Therefore, it is imperative to develop a light, thin and portable high-performance flexible energy storage system. Among the various existing energy storage systems, all-solid-state flexible supercapacitors are preferred due to their fast charging and discharging speed, high power density, wide operating temperature, good stability, long service life an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/30H01G11/36H01G11/84H01G11/86
CPCH01G11/26H01G11/30H01G11/36H01G11/84H01G11/86Y02E60/13
Inventor 肖巍周文杰
Owner SHENZHEN KANGSHENG PHOTOELECTRIC TECH
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