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Low-resistivity conductive carbon thin film and preparation method thereof

A low-resistivity, conductive carbon technology, applied in solid electrolyte fuel cells, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of high resistivity of conductive carbon films and poor uniformity of preparation methods , to achieve the effect of low cost, good flexibility and simple process

Active Publication Date: 2017-02-22
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the current problems of high resistivity of conductive carbon films and poor uniformity of preparation methods, the embodiment of the present invention provides a low-resistivity conductive carbon film and its preparation method

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  • Low-resistivity conductive carbon thin film and preparation method thereof
  • Low-resistivity conductive carbon thin film and preparation method thereof
  • Low-resistivity conductive carbon thin film and preparation method thereof

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preparation example Construction

[0054] In one embodiment, the preparation method of the above-mentioned low-resistivity conductive carbon film at least includes the following steps:

[0055] Weigh conductive carbon, film-forming agent, and other additives according to the above formula ratio;

[0056] Using a modifier to modify the surface of the conductive carbon to obtain a modified conductive carbon;

[0057] using a dispersing solvent to disperse the modified conductive carbon to obtain a conductive carbon dispersion;

[0058] adding the film-forming agent and other additives to the conductive carbon dispersion, and mixing to obtain a slurry with a viscosity of 100-1500 mPa·s;

[0059] coating or casting the slurry on a substrate to obtain a wet film;

[0060] Drying the wet film together with the substrate to obtain a dry conductive film;

[0061] The conductive film is soaked, filmed and air-dried.

[0062] Wherein, in a preferred embodiment, based on 100% of the mass of conductive carbon, in the wei...

Embodiment 1

[0080] A low-resistivity conductive carbon film, according to mass percentage, includes the following components:

[0081]

[0082] The preparation method of described low-resistivity conductive carbon film is as follows:

[0083] First weigh 60.0g of carbon nanotube conductive carbon and 2.5g of KS-6;

[0084] Add the mixed conductive carbon to 300mL mixed acid for treatment for 6-24h, the mixed acid is sulfuric acid: nitric acid = 1:2 according to the volume ratio, and then use deionized water to filter and clean until pH = 7;

[0085] The treated mixed conductive carbon is dispersed into an aqueous solution with a mass fraction of 10% in a 3000r / min disperser;

[0086] Add a mixture of polyvinyl alcohol (PVA) and acrylonitrile multi-polymer with a total mass of 5 g to the above aqueous solution, and add 0.5 g of styrene-butadiene rubber, and then magnetically stir for 8 hours at room temperature to prepare a slurry suspension. The viscosity of the suspension is 600mPa·...

Embodiment 2

[0091] A low-resistivity conductive carbon film, according to mass percentage, includes the following components:

[0092]

[0093] The preparation method of described low-resistivity conductive carbon film is as follows:

[0094] First weigh 75g of carbon nanotubes, weigh Super P according to the mass ratio of carbon nanotubes and Super P of 5:1, and mix the two to form mixed conductive carbon;

[0095] Weigh 0.7g polyvinylpyrrolidone and disperse it in 500g dimethylformamide (DMF) solution to form a dispersion;

[0096] Adding the mixed conductive carbon to the above dispersion liquid for mixing treatment;

[0097] Disperse the treated mixed conductive carbon in a 2000r / min disperser for 4h to form a suspension;

[0098] Adding a total mass of 9.0g polyvinylidene fluoride (PVDF) and polyimide mixture to the above suspension, in the mixture, the mass ratio of PVDF and polyimide is 10:1; will add 0.3g butane Styrene rubber, then magnetically stirred at room temperature f...

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Abstract

The invention provides a low-resistivity conductive carbon thin film and a preparation method thereof. The low-resistivity conductive carbon thin film comprises the following components in percentage by mass: 50%-95% of conductive carbon, 4.5%-59% of a film-forming agent and 0.5%-1.4% of other additives, wherein the conductive carbon comprises the following components of 25%-100% of a carbon nanotube and 0-75% of other conductive carbon on the basis of 100%; and the content of the other conductive carbon is not 0. The obtained conductive carbon thin film is smooth and uniform in surface, can be curled and has good flexibility; above all, the resistivity of the conductive carbon thin film is 20mohm.cm to 50ohm.cm; the tensile strength is 10MPa and above; and the low-resistivity conductive carbon thin film has excellent conductivity and mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of conductive carbon thin films, and in particular relates to a low-resistivity conductive carbon thin film and a preparation method thereof. Background technique [0002] Conductive carbon film is an important part of proton fuel cells, and the pores formed by its microscopic morphology are important electron channels in fuel cells, as well as gas and drainage channels. Therefore, conductive carbon thin films are required to have good mechanical strength and excellent electrical conductivity. [0003] At present, the conductive carbon film is mainly made of carbon fiber plus a binder, and the preparation method is carbonized by dipping a curing agent. This method needs to improve the strength by dipping, but the uniformity of the carbon film obtained by the dipping method cannot be guaranteed. [0004] In addition, there is also a method of preparing a film by mixing it with a polymer to form a melt, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0234H01M8/0241H01M8/10H01B1/24
CPCH01B1/24H01M8/0234H01M8/0241Y02E60/50
Inventor 孔令涌方东升尚伟丽黄少真
Owner SHENZHEN DYNANONIC