CN111210996A - Graphene capacitor - Google Patents
Graphene capacitor Download PDFInfo
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- CN111210996A CN111210996A CN202010034191.9A CN202010034191A CN111210996A CN 111210996 A CN111210996 A CN 111210996A CN 202010034191 A CN202010034191 A CN 202010034191A CN 111210996 A CN111210996 A CN 111210996A
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- microporous ceramic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/54—Electrolytes
- H01G11/58—Liquid electrolytes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/78—Cases; Housings; Encapsulations; Mountings
- H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
Abstract
The invention relates to the technical field of capacitors and discloses a graphene capacitor, which comprises a shell, wherein two microporous ceramic matrixes are arranged in the shell, graphene particles are filled in micropores in the microporous ceramic matrixes, a plurality of medium through holes are formed between the top surface and the bottom surface of each microporous ceramic matrix, insulating coatings are arranged on the outer side surfaces and the bottom surfaces of the microporous ceramic matrixes, and graphene coatings are arranged on the inner walls of the medium through holes and the top surfaces of the microporous ceramic matrixes; one side face of each of the two microporous ceramic matrixes is fixedly connected in a fitting manner, medium cavities are formed in the side faces, which are fitted, of the microporous ceramic matrixes, graphene coatings are arranged on the inner walls of the medium cavities, medium partition plates are arranged at the opening ends of the two medium cavities, and electrolytes are filled in the medium cavities and the medium holes; the top surface of one of the micropore ceramic bases is fixed with a positive plate, and the top surface of the other micropore ceramic base is fixed with a negative plate. The invention has the beneficial effect of high charging and discharging efficiency.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a graphene capacitor.
Background
The graphene capacitor is a general name of the supercapacitor based on the graphene material, and due to the unique two-dimensional structure and excellent physical properties of graphene, for example, graphene has ultrahigh surface area and super-strong conductivity, and the graphene material has great application prospect in the field of supercapacitors. However, most of graphene capacitors at present have unreasonable structures, the outstanding physical properties of graphene are not fully exerted, and the problem of low charging and discharging efficiency still exists in common graphene capacitors at present.
Disclosure of Invention
The invention provides a graphene capacitor with high charge-discharge efficiency, aiming at solving the problem that the graphene capacitor in the prior art is low in charge-discharge efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a graphene capacitor comprises a shell, wherein two microporous ceramic matrixes distributed side by side are arranged in the shell, graphene particles are filled in micropores in the microporous ceramic matrixes, a plurality of medium through holes are formed between the top surface and the bottom surface of each microporous ceramic matrix, insulating coatings are arranged on the outer side surfaces and the bottom surfaces of the microporous ceramic matrixes, graphene coatings are arranged on the inner walls of the medium through holes and the top surfaces of the microporous ceramic matrixes, and bottom plates for sealing the medium through holes are fixed at the bottoms of the microporous ceramic matrixes; one side face of each of the two microporous ceramic matrixes is fixedly connected in an attaching mode, medium cavities are formed in the attached side faces of the microporous ceramic matrixes, graphene coatings are arranged on the inner walls of the medium cavities, the open ends of the medium cavities in the two microporous ceramic matrixes are fixedly attached to form closed cavities, medium partition plates are arranged at the open ends of the two medium cavities, and electrolytes are filled in the medium cavities and the medium holes; the top surface of one of them micropore ceramic base member is fixed with the positive plate, and the top surface of positive plate is fixed with anodal pin, and the top surface of another micropore ceramic base member is fixed with the negative plate, and the top surface of negative plate is fixed with the negative pole pin, the upper end of casing is equipped with the end cover.
The positive plate is electrically connected with one of the microporous ceramic matrixes through the graphene coating on the top surface of the microporous ceramic matrix, the positive plate and one of the microporous ceramic matrixes form the positive electrode of the capacitor, and similarly, the negative plate is electrically connected with the other microporous ceramic matrix through the graphene coating on the top surface of the microporous ceramic matrix, and the negative plate and the graphene coating on the top surface of the microporous ceramic matrix are electrically connected with one of the microporous ceramic matrixes to form the negative electrode of the capacitor; the micropore ceramic matrix is distributed with a large number of micropores, the surface area of the micropores is very large, the contact surface area of the micropore ceramic matrix and an electrolyte is very large, the micropores are filled with graphene particles, the graphene particles have good conductivity, when the capacitor is charged, charges in the electrolyte can rapidly and directionally move to a positive electrode and a negative electrode, so that the rapid and efficient charging is realized, and the discharge rate is very high during discharging; and the microporous ceramic matrix has stable structure, good insulation and heat dissipation performance, so that the graphene capacitor has stable structure and long service life.
Preferably, the shell is in a regular hexagonal prism shape, connecting holes are formed in two ends of each of the two microporous ceramic matrixes, the connecting holes are connected through U-shaped fasteners, and the two microporous ceramic matrixes are connected to form the regular hexagonal prism shape integrally. The whole regular hexagonal prism structure that is of capacitor, like this a large amount of graphite alkene capacitor bank uses together and forms super capacitor, and the structure between the capacitor is compacter, and energy density is high (common capacitor is cylindricly, has a large amount of space wastes when a plurality of combinations use).
Preferably, a gap is formed between the shell and the microporous ceramic substrate, and a supporting rib is arranged in the middle of the inner edge of the shell. The gaps are favorable for heat dissipation of the microporous ceramic matrix, and meanwhile, after the microporous ceramic matrix is used for a long time, a small amount of gas can be generated in the electrolyte, and the gas can be discharged from the gaps.
Preferably, the gap is filled with a refractory filler. The fire-resistant filler can enhance the fire resistance of the capacitor.
Preferably, an insulating plate is arranged between the bottom plate and the microporous ceramic base body, and sealing bosses which correspond to the medium through holes one by one are arranged on the top surface of the insulating plate. The insulating board plays the insulating effect to the bottom surface of micropore ceramic base member, and sealed boss further plays sealed effect.
Preferably, the lower side surfaces of the positive plate and the negative plate are respectively provided with a sealing convex ring which is in one-to-one correspondence with the medium through holes. The sealing convex ring plays a role in sealing the upper end of the medium through hole, and meanwhile, the outer ring of the sealing convex ring is in contact with the graphene coating on the inner wall of the medium through hole, so that the electric connection stability of the positive plate (or the negative plate) and the microporous ceramic matrix is ensured.
Preferably, the bottom of the medium cavity in the microporous ceramic substrate is provided with a plurality of transverse connecting holes communicated with the medium through holes. The electrolytes in the medium through holes are also communicated with each other through the transverse connecting holes, so that the flow of charges in the electrolytes is facilitated.
Preferably, the electrolyte is a gel electrolyte, and the gel electrolyte is sulfuric acid-polyacrylic acid. The gel electrolyte is solid polymer electrolyte, so that the capacitor has more stable performance and good anti-seismic performance.
Preferably, the processing technology of the microporous ceramic matrix is as follows:
a. preparing a microporous ceramic matrix with porosity of 30-40% and micropore diameter of 30-40 μm, and machining a medium through hole and a medium cavity on the microporous ceramic matrix;
b. adding graphene powder with the particle size of 10-20 microns and a hydrophilic surfactant into water, stirring to form a graphene suspension, sealing a medium through hole at one end of a microporous ceramic matrix, injecting the graphene suspension into the other end of the microporous ceramic matrix at high pressure until the graphene suspension overflows on the outer side surface of the microporous ceramic matrix, and then stopping injecting the graphene suspension into micropores; placing the microporous ceramic matrix into a calcining furnace, calcining under the protection of argon at the temperature of 500-600 ℃ for 3-5 minutes, and taking out and naturally cooling;
c. repeating the step b twice, and fixedly filling the micropores in the microporous ceramic matrix with graphene particles;
d. plating a graphene coating on the top surface of the microporous ceramic substrate, the inner wall of the medium through hole and the inner wall of the medium cavity; and preparing insulating coatings on the side surface and the bottom surface of the microporous ceramic substrate, wherein the insulating coatings are aluminum oxide coatings.
Therefore, the invention has the following beneficial effects: (1) the whole structure is stable, the performance is stable, and the service life is long; (2) the surface area of the electrode is large, and the charging and discharging efficiency is higher; (3) the capacitor is hexagonal prism-shaped as a whole, the combined use structure is more compact, and the energy density is high.
Drawings
FIG. 1 is a schematic diagram of a structure of the present invention.
Fig. 2 is a top view of fig. 1 with the end cap removed.
Fig. 3 is a cross-sectional view taken at a-a in fig. 1.
In the figure: the sealing structure comprises a shell 1, supporting convex ribs 100, a microporous ceramic substrate 2, a medium cavity 200, medium through holes 3, a bottom plate 4, an insulating plate 5, a sealing boss 50, a medium separator 6, an electrolyte 7, a positive plate 8, a sealing convex ring 80, a positive pin 9, a negative plate 10, a negative pin 11, an end cover 12, a connecting hole 13, a U-shaped fastener 14, a gap 15, a refractory filler 16 and a transverse connecting hole 17.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description below:
as shown in fig. 1, 2 and 3, a graphene capacitor includes a housing 1, two microporous ceramic substrates 2 distributed side by side are disposed in the housing 1, graphene particles are filled in micropores in the microporous ceramic substrates 2, a plurality of medium through holes 3 are disposed between a top surface and a bottom surface of each microporous ceramic substrate 2, insulating coatings are disposed on outer side surfaces and bottom surfaces of the microporous ceramic substrates, graphene coatings are disposed on inner walls of the medium through holes 3 and top surfaces of the microporous ceramic substrates, a bottom plate 4 for sealing the medium through holes is fixed at the bottom of each microporous ceramic substrate 2, an insulating plate 5 is disposed between the bottom plate 4 and the microporous ceramic substrate 2, and sealing bosses 50 corresponding to the medium through holes one to one are disposed on the top surface of the insulating plate 5; one side face of each of the two microporous ceramic substrates 2 is fixedly connected in an attaching mode, the attaching side faces of the microporous ceramic substrates are provided with a medium cavity 200, the inner wall of each medium cavity is provided with a graphene coating, the open ends of the medium cavities on the two microporous ceramic substrates are fixedly attached to form a closed cavity, the open ends of the two medium cavities are provided with medium partition plates 6, and the medium cavities and the medium holes are filled with electrolytes 7 which are gel electrolytes, wherein the gel electrolytes in the embodiment are sulfuric acid-polyacrylic acid; the top surface of one of them micropore ceramic base member is fixed with positive plate 8, and the top surface of positive plate 8 is fixed with anodal pin 9, and the top surface of another micropore ceramic base member is fixed with negative plate 10, and the top surface of negative plate is fixed with negative pole pin 11, and the downside of positive plate 8, negative plate 10 all is equipped with the sealed bulge loop 80 with medium through-hole one-to-one, and the upper end of casing is equipped with end cover 12, and the end cover is fixed with casing paper article joint.
The shell 1 is in a regular hexagonal prism shape, connecting holes 13 are formed in two ends of each of the two microporous ceramic matrixes and are connected through a U-shaped fastener 14, and the two microporous ceramic matrixes are connected to form the regular hexagonal prism shape as a whole; the regular hexagonal prism structure is beneficial to combination use, for example, seven capacitors can be combined for use, the rhythm is compact, the space utilization rate is high, and the energy density is high; a gap 15 is arranged between the shell 1 and the microporous ceramic substrate 2, a supporting convex rib 100 is arranged in the middle of the inner edge of the shell 1, and a refractory filler 16 is filled in the gap; the bottom of the medium cavity in the microporous ceramic base 2 is provided with a plurality of transverse connecting holes 17 communicated with the medium through holes, and each medium through hole is communicated with the medium cavity 5 through the transverse connecting holes.
The processing technology of the microporous ceramic matrix is as follows: a. Preparing a microporous ceramic matrix with porosity of 30-40% and micropore diameter of 30-40 μm, and machining a medium through hole and a medium cavity on the microporous ceramic matrix; b. adding graphene powder with the particle size of 10-20 microns and a hydrophilic surfactant into water, stirring to form a graphene suspension, sealing a medium through hole at one end of a microporous ceramic matrix, injecting the graphene suspension into the other end of the microporous ceramic matrix at high pressure until the graphene suspension overflows on the outer side surface of the microporous ceramic matrix, and then stopping injecting the graphene suspension into micropores; placing the microporous ceramic matrix into a calcining furnace, calcining under the protection of argon at the temperature of 500-600 ℃ for 3-5 minutes, and taking out and naturally cooling; c. repeating the step b twice, and fixedly filling the micropores in the microporous ceramic matrix with graphene particles; d. plating a graphene coating on the top surface of the microporous ceramic substrate, the inner wall of the medium through hole and the inner wall of the medium cavity; and preparing insulating coatings on the side surface and the bottom surface of the microporous ceramic substrate, wherein the insulating coatings are aluminum oxide coatings.
The principle of the invention is as follows with reference to the attached drawings: the positive plate is electrically connected with one of the microporous ceramic matrixes through the graphene coating on the top surface of the microporous ceramic matrix, the positive plate and one of the microporous ceramic matrixes form the positive electrode of the capacitor, and similarly, the negative plate is electrically connected with the other microporous ceramic matrix through the graphene coating on the top surface of the microporous ceramic matrix, and the negative plate and the graphene coating on the top surface of the microporous ceramic matrix are electrically connected with one of the microporous ceramic matrixes to form the negative electrode of the capacitor; the micropore ceramic matrix is distributed with a large number of micropores, the surface area of the micropores is very large, the contact surface area of the micropore ceramic matrix and an electrolyte is very large, the micropores are filled with graphene particles, the graphene particles have good conductivity, when the capacitor is charged, charges in the electrolyte can rapidly and directionally move to a positive electrode and a negative electrode, so that the rapid and efficient charging is realized, and the discharge rate is very high during discharging; and the microporous ceramic matrix has stable structure, good insulation and heat dissipation performance, so that the graphene capacitor has stable structure and long service life.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.
Claims (9)
1. The graphene capacitor comprises a shell and is characterized in that two microporous ceramic matrixes distributed side by side are arranged in the shell, graphene particles are filled in micropores in the microporous ceramic matrixes, a plurality of medium through holes are formed between the top surface and the bottom surface of each microporous ceramic matrix, insulating coatings are arranged on the outer side surfaces and the bottom surfaces of the microporous ceramic matrixes, graphene coatings are arranged on the inner walls of the medium through holes and the top surfaces of the microporous ceramic matrixes, and bottom plates for sealing the medium through holes are fixed at the bottoms of the microporous ceramic matrixes; one side face of each of the two microporous ceramic matrixes is fixedly connected in an attaching mode, medium cavities are formed in the attached side faces of the microporous ceramic matrixes, graphene coatings are arranged on the inner walls of the medium cavities, the open ends of the medium cavities in the two microporous ceramic matrixes are fixedly attached to form closed cavities, medium partition plates are arranged at the open ends of the two medium cavities, and electrolytes are filled in the medium cavities and the medium holes; the top surface of one of them micropore ceramic base member is fixed with the positive plate, and the top surface of positive plate is fixed with anodal pin, and the top surface of another micropore ceramic base member is fixed with the negative plate, and the top surface of negative plate is fixed with the negative pole pin, the upper end of casing is equipped with the end cover.
2. The graphene capacitor according to claim 1, wherein the housing is in a regular hexagonal prism shape, two ends of the two microporous ceramic substrates are respectively provided with a connecting hole, the connecting holes are connected through a U-shaped fastener, and the two microporous ceramic substrates are connected to form a regular hexagonal prism shape as a whole.
3. The graphene capacitor according to claim 2, wherein a gap is formed between the case and the microporous ceramic substrate, and a supporting rib is formed at a middle portion of the inner edge of the case.
4. A graphene capacitor according to claim 2 or 3, wherein the gap is filled with a refractory filler.
5. The graphene capacitor according to claim 1, wherein an insulating plate is disposed between the bottom plate and the microporous ceramic substrate, and sealing bosses corresponding to the dielectric through holes are disposed on a top surface of the insulating plate.
6. The graphene capacitor as claimed in claim 1 or 5, wherein the lower sides of the positive and negative plates are provided with sealing convex rings corresponding to the medium through holes one by one.
7. The graphene capacitor according to claim 1, wherein the microporous ceramic substrate is provided with a plurality of transverse connection holes at the bottom of the dielectric cavity, and the transverse connection holes are communicated with the dielectric through holes.
8. The graphene capacitor of claim 1, wherein the electrolyte is a gel electrolyte, and the gel electrolyte is sulfuric acid-polyacrylic acid.
9. The graphene capacitor according to claim 1, wherein the microporous ceramic substrate is processed by the following steps:
a. preparing a microporous ceramic matrix with porosity of 30-40% and micropore diameter of 30-40 μm, and machining a medium through hole and a medium cavity on the microporous ceramic matrix;
b. adding graphene powder with the particle size of 10-20 microns and a hydrophilic surfactant into water, stirring to form a graphene suspension, sealing a medium through hole at one end of a microporous ceramic matrix, injecting the graphene suspension into the other end of the microporous ceramic matrix at high pressure until the graphene suspension overflows on the outer side surface of the microporous ceramic matrix, and then stopping injecting the graphene suspension into micropores; placing the microporous ceramic matrix into a calcining furnace, calcining under the protection of argon at the temperature of 500-600 ℃ for 3-5 minutes, and taking out and naturally cooling;
c. repeating the step b twice, and fixedly filling the micropores in the microporous ceramic matrix with graphene particles;
d. plating a graphene coating on the top surface of the microporous ceramic substrate, the inner wall of the medium through hole and the inner wall of the medium cavity; and preparing insulating coatings on the side surface and the bottom surface of the microporous ceramic substrate, wherein the insulating coatings are aluminum oxide coatings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010034191.9A CN111210996B (en) | 2020-01-13 | 2020-01-13 | Graphene capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010034191.9A CN111210996B (en) | 2020-01-13 | 2020-01-13 | Graphene capacitor |
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| CN111210996A true CN111210996A (en) | 2020-05-29 |
| CN111210996B CN111210996B (en) | 2021-07-16 |
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| CN202010034191.9A Active CN111210996B (en) | 2020-01-13 | 2020-01-13 | Graphene capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113421774A (en) * | 2021-06-21 | 2021-09-21 | 哈尔滨工业大学 | Clamp for manufacturing capacitor from graphene suspension film |
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| CN102923698A (en) * | 2012-11-19 | 2013-02-13 | 中南大学 | Preparation method for three-dimensional porous graphene for supercapacitor |
| CN105761948A (en) * | 2016-03-16 | 2016-07-13 | 辽宁博艾格电子科技有限公司 | Graphene supercapacitor |
| CN205428711U (en) * | 2016-03-16 | 2016-08-03 | 辽宁博艾格电子科技有限公司 | Graphite alkene ultracapacitor system structure |
| CN105985140A (en) * | 2015-03-06 | 2016-10-05 | 于有海 | Graphene and ceramic composite film and preparation method thereof |
| CN106467300A (en) * | 2015-08-13 | 2017-03-01 | 中国科学院上海硅酸盐研究所 | Three-dimensional grapheme material of micropore-mesopore-macropore multilevel hierarchy and its preparation method and application |
| CN207425638U (en) * | 2017-10-18 | 2018-05-29 | 东莞市共和电子有限公司 | A kind of graphene capacitor |
-
2020
- 2020-01-13 CN CN202010034191.9A patent/CN111210996B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923698A (en) * | 2012-11-19 | 2013-02-13 | 中南大学 | Preparation method for three-dimensional porous graphene for supercapacitor |
| CN105985140A (en) * | 2015-03-06 | 2016-10-05 | 于有海 | Graphene and ceramic composite film and preparation method thereof |
| CN106467300A (en) * | 2015-08-13 | 2017-03-01 | 中国科学院上海硅酸盐研究所 | Three-dimensional grapheme material of micropore-mesopore-macropore multilevel hierarchy and its preparation method and application |
| CN105761948A (en) * | 2016-03-16 | 2016-07-13 | 辽宁博艾格电子科技有限公司 | Graphene supercapacitor |
| CN205428711U (en) * | 2016-03-16 | 2016-08-03 | 辽宁博艾格电子科技有限公司 | Graphite alkene ultracapacitor system structure |
| CN207425638U (en) * | 2017-10-18 | 2018-05-29 | 东莞市共和电子有限公司 | A kind of graphene capacitor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113421774A (en) * | 2021-06-21 | 2021-09-21 | 哈尔滨工业大学 | Clamp for manufacturing capacitor from graphene suspension film |
| CN113421774B (en) * | 2021-06-21 | 2022-07-08 | 哈尔滨工业大学 | Clamp for manufacturing capacitor from graphene suspension film |
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| CN111210996B (en) | 2021-07-16 |
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