CN112259372A - Novel graphene coating aluminum foil capacitor - Google Patents
Novel graphene coating aluminum foil capacitor Download PDFInfo
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- CN112259372A CN112259372A CN202011025147.8A CN202011025147A CN112259372A CN 112259372 A CN112259372 A CN 112259372A CN 202011025147 A CN202011025147 A CN 202011025147A CN 112259372 A CN112259372 A CN 112259372A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
Abstract
The invention relates to the technical field of capacitors, and provides a novel graphene coating aluminum foil capacitor, aiming at solving the problem that graphene films in the existing parallel plate capacitor are poor in mechanical property and cannot meet diversified demands on the market, wherein the capacitor is a parallel plate capacitor obtained by alternately distributing two layers of graphene coating aluminum foils serving as conducting layers and two layers of polypropylene films and laminating the two layers of graphene coating aluminum foils and the two layers of polypropylene films; the graphene coating aluminum foil is prepared from the following raw materials in parts by weight: 1-2 parts of melamine, 50-55 parts of graphene dispersion liquid, 0.1-0.2 part of citric acid, 1-2 parts of magnesium stearate, 1-2 parts of polyacrylamide, 2-4 parts of simethicone and a proper amount of deionized water. The graphene film disclosed by the invention is good in mechanical property, and has higher social use value and application prospect.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a novel graphene coating aluminum foil capacitor.
Background
The graphene transparent conductive film product can be compatible with various integration modes including GG, GFF, GIF and the like, and is particularly suitable for various high-performance touch displays (with characteristics including quick response, multi-point touch, high sensitivity, 3D touch, accurate touch of an active capacitance pen, medium and large size, flexibility, narrow frames, ultra-light and ultra-thin, streamline design, outdoor application and the like) leading trend, such as interactive terminals, digital signage, electronic whiteboards, smart homes, automobile center consoles and the like. In addition, the product is also suitable for various fields needing transparent electrodes, such as OLED lighting, electrochromic intelligent windows, flexible display, EMI (electro-magnetic interference), liquid crystal display, electronic paper, transparent heating and the like. The method is suitable for glass, quartz, sapphire, PET, PEN, PI, PC, PMMA, PP films and other substrates with any size and thickness.
Parallel plate capacitors are constructed of two parallel metal conductor plates separated by a dielectric material. When a certain potential difference exists between the two plates, electrostatic field distribution exists between the plates. There is a uniform electric field distribution in the portion between the two plates, and the electric field lines at the capacitor edges are curved and divergent due to the fringe effect. The parallel plate capacitor is the simplest capacitor, and any non-parallel plate capacitor can be regarded as being formed by connecting a plurality of small parallel plate capacitors in series and in parallel, and adopts a physical energy storage mode.
S represents the relative area of the two parallel metal plates, d represents the distance between the two plates, and the two plates are filled with dielectric medium which is relative dielectric medium. Assuming it carries an electric quantity Q (i.e. the two corresponding surfaces on the two plates carry + Q and-Q, respectively), the charge density ignores the edge effect, according to gaussian theorem:
according to the Gauss theorem
The electric field between the two plates is
The voltage of the two plates is
The capacitance of the parallel plate capacitor can be obtained by substituting the voltage into the definition formula of the capacitance
The graphene film in the existing parallel plate capacitor has poor mechanical property and cannot meet the diversified demands in the market. Therefore, a novel graphene-coated aluminum foil capacitor is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a novel graphene coating aluminum foil capacitor, which overcomes the defects of the prior art, has reasonable design and compact structure and aims to solve the problems that the graphene film in the existing parallel plate capacitor has poor mechanical property and cannot meet diversified requirements in the market.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
a novel graphene coated aluminum foil capacitor 1 is a parallel plate capacitor which is obtained by alternately distributing two layers of graphene coated aluminum foils serving as conducting layers and two layers of polypropylene films and laminating;
the graphene coating aluminum foil is prepared from the following raw materials in parts by weight: 1-2 parts of melamine, 50-55 parts of graphene dispersion liquid, 0.1-0.2 part of citric acid, 1-2 parts of magnesium stearate, 1-2 parts of polyacrylamide, 2-4 parts of simethicone and a proper amount of deionized water;
the graphene dispersion liquid is prepared from the following raw materials in parts by weight: 30-60 parts of graphene, 4-10 parts of chitosan, 4-5 parts of polyvinyl alcohol, 1-2 parts of calcium lignosulfonate, 1-3 parts of ethyl orthosilicate and 20-30 parts of deionized water.
Preferably, the preparation method of the graphene dispersion liquid comprises the following steps:
uniformly mixing chitosan, polyvinyl alcohol and calcium lignosulfonate with a proper amount of deionized water, stirring for 1-2 hours at the temperature of 50-55 ℃, cooling to normal temperature, adding ethyl orthosilicate, and performing ultrasonic treatment for 5-10 minutes to obtain the graphene dispersion liquid.
Preferably, 3, the preparation method of the graphene-coated aluminum foil comprises the following steps:
(1) taking the graphene dispersion liquid, melamine and magnesium stearate, stirring for 1-2 hours at the temperature of 50-60 ℃, adding the rest raw materials, stirring for 1-2 hours at the temperature of 30-40 ℃ to obtain a graphene coating for later use;
(2) and soaking the aluminum foil in the obtained graphene coating solution for 15-30min, taking out, drying in vacuum at 80-100 ℃ for 10-20 min, and annealing for 1h to obtain the graphene coating aluminum foil.
Preferably, the thickness of the graphene coating on the graphene coated aluminum foil is 0.1-20 um.
Preferably, the annealing temperature is 450-500 ℃.
Preferably, the capacitor core is formed by winding or laminated in a sheet shape, voltage is applied to two ends of the capacitor core, and the capacitor core group stores energy charges.
Preferably, the width of the graphene coating aluminum foil is smaller than that of the polypropylene film, an edge is left after the graphene coating aluminum foil and the polypropylene film are laminated, and a staggered edge exists between the first layer of graphene coating aluminum foil and the second layer of polypropylene film.
(III) advantageous effects
The embodiment of the invention provides a novel graphene coating aluminum foil capacitor, which has the following beneficial effects:
according to the invention, the natural sponge and the corncobs are carbonized, and then the film is prepared, so that the film modification process is optimized, and the effect of improving the performance of the graphene film is obvious, thereby further improving the quality of the capacitor.
Drawings
The above features, technical features, advantages and implementation manners of the novel graphene-coated aluminum foil capacitor will be further described in the following detailed description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an exploded view of a novel graphene composite thin film capacitor structure according to an embodiment of the present invention.
In the figure: graphene coated aluminum foil 1, polypropylene film 2, polypropylene layer Ia 1, graphene coated aluminum foil Ia 2, polypropylene layer IIa 3 and graphene coated aluminum foil IIa 4.
Detailed Description
The invention will be further illustrated with reference to the following figures 1-2 and examples:
a novel graphene coated aluminum foil capacitor is a parallel plate capacitor which is obtained by alternately distributing two layers of graphene coated aluminum foils 1 serving as conducting layers and two layers of polypropylene films 2 and laminating;
as shown in fig. 1 and 2, the polypropylene layer ia 1, the graphene-coated aluminum foil ia 2, the polypropylene layer iia 3, and the graphene-coated aluminum foil iia 4 are sequentially stacked to form the parallel plate capacitor of the present invention, wherein it is understood that the polypropylene layer ia 1 and the polypropylene layer iia 3 are polypropylene films 2, and the graphene-coated aluminum foil ia 2 and the graphene-coated aluminum foil iia 4 are graphene-coated aluminum foils 1.
The graphene-coated aluminum foil is prepared from the following raw materials in parts by weight (kg): 2 parts of melamine, 55 parts of graphene dispersion liquid, 0.2 part of citric acid, 2 parts of magnesium stearate, 1-2 parts of polyacrylamide, 2-4 parts of dimethyl silicone oil and a proper amount of deionized water;
the graphene dispersion liquid is prepared from the following raw materials in parts by weight (kg): 40 parts of graphene, 6 parts of chitosan, 4 parts of polyvinyl alcohol, 1 part of calcium lignosulfonate, 3 parts of ethyl orthosilicate and 20 parts of deionized water.
In this embodiment, the preparation method of the graphene dispersion liquid includes:
uniformly mixing chitosan, polyvinyl alcohol and calcium lignosulfonate with a proper amount of deionized water, keeping the temperature at 55 ℃, stirring for 1 hour, cooling to normal temperature, adding ethyl orthosilicate, and performing ultrasonic treatment for 5-10 minutes to obtain the graphene dispersion liquid.
In this embodiment, the preparation method of the graphene-coated aluminum foil includes:
(1) taking the graphene dispersion liquid, melamine and magnesium stearate, stirring for 2 hours at the temperature of 60 ℃, adding the rest raw materials, stirring for 1-2 hours at the temperature of 40 ℃ to obtain the graphene coating for later use;
(2) and (3) soaking the aluminum foil in the obtained graphene coating solution for 30min, fishing out, drying in vacuum for 20 min at 100 ℃, and then annealing at 450 ℃ for 1h to obtain the graphene coating aluminum foil.
In this embodiment, graphene coating thickness on the graphene coating aluminium foil is 2um, the capacitor core adopt winding forming or the laminating of slice to press, voltage is applyed at both ends, the energy storage electric charge of capacitor core group.
In this embodiment, the annealing temperature is 500 ℃.
The resistance of the graphene-coated aluminum foil tested on the films of this example was 4.5x 10-6-9 x10-7 Ω · cm.
The film of the embodiment maintains the advantages of low sheet resistance (<20 Ω/sq), low haze (< 2%), low cost, EMI shielding and the like, and is an ideal substitute for the upgrade of the existing product and the conventional ITO. Without calculating the PET substrate, the transmittance at 550nm can reach 97%, the minimum surface resistance is less than 20 omega/sq, and the nonuniformity is less than 10%. The material and device reliability tests are passed, including tests of high temperature and high humidity, high/low temperature storage, cold and hot shock, UV and salt spray weather resistance, silver migration and the like. The dielectric constant of the material is about 3-4.5.
In this embodiment, the width d1 of the graphene coated aluminum foil 1 is smaller than the width d2 of the polypropylene film 2, an edge d4 exists after the graphene coated aluminum foil 1 and the polypropylene film 2 are laminated, and a misalignment d3 exists between the first graphene coated aluminum foil 1 and the second polypropylene film 2.
The environment and reliability tests of the capacitor a obtained in this example and the parallel plate capacitor B prepared by the same conventional process using the aluminum foil coated with the carbon black having the same thickness were performed, and the results were as follows:
the capacitance value of the capacitor A is kept unchanged for 300h at the low temperature of 55 ℃;
the capacitor B keeps the capacitance value of 300h at the low temperature of 55 ℃ below zero and is reduced by 0.12% at the beginning;
the capacitance value of the capacitor A is kept unchanged for 300h at the high temperature of 70 ℃;
the capacitor B keeps the capacitance value for 300h at the high temperature of 70 ℃ and rises by 0.05 percent at the beginning.
And (3) carrying out an impact test:
the impact in each direction of the front direction, the back direction, the left direction, the right direction, the upper direction and the lower direction is twelve times, the total number is seventy times, the peak acceleration is 20g, the duration is 11ms,
the capacitance value of the capacitor A is unchanged;
the capacitance of the capacitor B is reduced by 0.09% from the initial value.
The result shows that the capacitor has excellent high temperature and low temperature impact resistance.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (7)
1. A novel graphene coated aluminum foil capacitor is characterized in that the capacitor is a parallel plate capacitor which is obtained by alternately distributing two layers of graphene coated aluminum foils serving as conducting layers and two layers of polypropylene films and laminating;
the graphene coating aluminum foil is prepared from the following raw materials in parts by weight: 1-2 parts of melamine, 50-55 parts of graphene dispersion liquid, 0.1-0.2 part of citric acid, 1-2 parts of magnesium stearate, 1-2 parts of polyacrylamide, 2-4 parts of simethicone and a proper amount of deionized water;
the graphene dispersion liquid is prepared from the following raw materials in parts by weight: 30-60 parts of graphene, 4-10 parts of chitosan, 4-5 parts of polyvinyl alcohol, 1-2 parts of calcium lignosulfonate, 1-3 parts of ethyl orthosilicate and 20-30 parts of deionized water.
2. The novel graphene-coated aluminum foil capacitor as claimed in claim 1, wherein: the preparation method of the graphene dispersion liquid comprises the following steps:
uniformly mixing chitosan, polyvinyl alcohol and calcium lignosulfonate with a proper amount of deionized water, stirring for 1-2 hours at the temperature of 50-55 ℃, cooling to normal temperature, adding ethyl orthosilicate, and performing ultrasonic treatment for 5-10 minutes to obtain the graphene dispersion liquid.
3. The novel graphene-coated aluminum foil capacitor as claimed in claim 1, wherein: the preparation method of the graphene coating aluminum foil comprises the following steps:
(1) taking the graphene dispersion liquid, melamine and magnesium stearate, stirring for 1-2 hours at the temperature of 50-60 ℃, adding the rest raw materials, stirring for 1-2 hours at the temperature of 30-40 ℃ to obtain a graphene coating for later use;
(2) and soaking the aluminum foil in the obtained graphene coating solution for 15-30min, taking out, drying in vacuum at 80-100 ℃ for 10-20 min, and annealing for 1h to obtain the graphene coating aluminum foil.
4. The novel graphene-coated aluminum foil capacitor as claimed in claim 1, wherein: the thickness of the graphene coating on the graphene coating aluminum foil is 0.1-20 um.
5. The novel graphene-coated aluminum foil capacitor as claimed in claim 3, wherein: the annealing temperature is 450-500 ℃.
6. The novel graphene-coated aluminum foil capacitor as claimed in claim 3, wherein: the capacitor core is formed by winding or laminated in a sheet mode, voltage is applied to two ends of the capacitor core, and the capacitor core group stores energy charges.
7. The novel graphene-coated aluminum foil capacitor as claimed in claim 1, wherein: the width of the graphene coating aluminum foil is smaller than that of the polypropylene film, an edge is left after the graphene coating aluminum foil and the polypropylene film are laminated, and a staggered edge exists between the first layer of graphene coating aluminum foil and the second layer of polypropylene film.
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| CN202011025147.8A CN112259372A (en) | 2020-09-25 | 2020-09-25 | Novel graphene coating aluminum foil capacitor |
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| CN202011025147.8A CN112259372A (en) | 2020-09-25 | 2020-09-25 | Novel graphene coating aluminum foil capacitor |
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| CN104211047A (en) * | 2013-05-30 | 2014-12-17 | 纳米新能源（唐山）有限责任公司 | Graphene, graphene electrode, graphene supercapacitor and preparation method thereof |
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Application publication date: 20210122 |
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