Graphene coated aluminum powder sintering type electrolytic capacitor anode foil and preparation method thereof

A graphene-coated, electrolytic capacitor technology, used in the manufacture of electrolytic capacitors, electrolytic capacitors, capacitors, etc.

Active Publication Date: 2021-11-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the process of sintered aluminum electrolytic capacitor anode foil needs to be further improved to improve the perfor...

Method used

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  • Graphene coated aluminum powder sintering type electrolytic capacitor anode foil and preparation method thereof
  • Graphene coated aluminum powder sintering type electrolytic capacitor anode foil and preparation method thereof

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preparation example Construction

[0040] A method for preparing a graphene-coated aluminum powder sintered electrolytic capacitor anode foil, in which the aluminum powder sintered anode foil is coated with graphene, specifically comprises the following steps:

[0041] 1) Mix the spherical aluminum powder, binder and solvent through the pulping process, and disperse the spherical aluminum powder in the solvent through high-speed ball milling to form aluminum powder slurry;

[0042] Wherein, the solvent is one or more of 1-methyl-2-pyrrolidone (NMP), N-N-dimethylformamide (DMF), γ-butyrolactone and n-butanol;

[0043]The binder is one or more of polyvinylidene fluoride (PVDF), carboxymethyl cellulose, epoxy resin, polyvinyl alcohol, starch and polystyrene.

[0044] The particle size of the spherical aluminum powder used in the present invention is between 0.5-5 μm.

[0045] 2) Add graphene or graphene dispersion liquid to the aluminum powder slurry prepared in step 1), and after high-speed ball milling, graphen...

Embodiment 1

[0064] 1) The solvent in the pulping process is NMP, and the binder is PVDF. Mix 1.5g of aluminum powder with 2mL of solvent and 0.15g of binder, and disperse the aluminum powder in the solvent by high-speed ball milling to form an aluminum powder slurry;

[0065] 2) Add the NMP dispersion of 1mL graphene to the aluminum powder slurry prepared in step 1), and after high-speed ball milling, graphene is uniformly dispersed in the slurry to obtain a mixed slurry, and graphene accounts for the mass fraction of the mixed slurry 1%;

[0066] 3) coating the mixed slurry prepared in step 2) on a high-purity aluminum foil, and drying in a vacuum after coating to obtain an initial slurry-coated aluminum foil;

[0067] 4) Sintering the initial paste aluminum foil prepared in step 3) at 120°C for 5 hours, then sintering at 420°C for 2 hours, and finally sintering at 640°C for 4 hours to obtain graphene-coated aluminum powder for sintering porous electrode foil.

[0068] 5) Anodizing the...

Embodiment 2

[0093] 1) The solvent in the pulping process is DMF, and the binder is epoxy resin. Mix 1.5g of aluminum powder with 2mL of solvent and 0.2g of binder, and disperse the aluminum powder in the solvent by high-speed ball milling to form an aluminum powder slurry ;

[0094] 2) Add the DMF dispersion liquid of 1mL graphene to the aluminum powder slurry prepared in step 1), and after high-speed ball milling, graphene is uniformly dispersed in the slurry to obtain a mixed slurry, and graphene accounts for the mass fraction of the mixed slurry 0.1%;

[0095]3) coating the mixed slurry prepared in step 2) on a high-purity aluminum foil, and drying in a vacuum after coating to obtain an initial slurry-coated aluminum foil;

[0096] 4) Sintering the initial paste aluminum foil prepared in step 3) at 100°C for 1 hour, then sintering at 300°C for 1 hour, and finally sintering at 500°C for 1 hour to obtain graphene-coated aluminum powder for sintering porous electrode foil.

[0097] 5) ...

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Abstract

The invention discloses a preparation method of a graphene coated aluminum powder sintering type electrolytic capacitor anode foil, which comprises the following steps of uniformly mixing spherical aluminum powder, an adhesive and a solvent to form aluminum powder slurry, adding graphene or graphene dispersion liquid into the aluminum powder slurry to obtain mixed slurry, coating an aluminum foil with the mixed slurry to obtain an initial slurry-coated aluminum foil, sintering the initial slurry-coated aluminum foil in inert gas, and acquiring the graphene-coated aluminum powder sintering type porous electrode foil, and performing anodic oxidation treatment on the graphene-coated aluminum powder sintering type porous electrode foil to obtain the graphene-coated aluminum powder sintering type electrolytic capacitor anode foil. The aluminum powder is subjected to graphene coating treatment, graphene serving as a two-dimensional material has the characteristic of ultrahigh specific surface area, contact between the aluminum powder is facilitated by adding the graphene in the sintering process, so that the sintering performance is improved, and the graphene/Al2O3 composite structure has a high dielectric constant.

Description

technical field [0001] The invention belongs to the field of aluminum electrolytic capacitors, in particular to a graphene-coated aluminum powder sintered electrolytic capacitor anode foil and a preparation method thereof. Background technique [0002] Aluminum electrolytic capacitor is an extremely important electronic component in the circuit system. It plays the role of filtering, bypassing, coupling, decoupling and energy storage in the circuit. It has large specific capacity per unit volume, high working electric field strength, self-healing Features, low prices, are widely used in household appliances, automotive electronics, industrial control, medical electronics, military electronics and aerospace and other fields. In recent years, with the continuous development of information technology and green new energy technology, the performance requirements of aluminum electrolytic capacitors are getting higher and higher, which promotes the development of aluminum electrol...

Claims

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Application Information

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IPC IPC(8): H01G9/00H01G9/045H01G9/055
CPCH01G9/045H01G9/055H01G9/0029
Inventor 徐友龙尹子豪赵晔航
Owner XI AN JIAOTONG UNIV
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