CN115376834A - Super capacitor with negative Poisson ratio characteristic and oak-leaf-imitating structure - Google Patents
Super capacitor with negative Poisson ratio characteristic and oak-leaf-imitating structure Download PDFInfo
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- CN115376834A CN115376834A CN202211002152.6A CN202211002152A CN115376834A CN 115376834 A CN115376834 A CN 115376834A CN 202211002152 A CN202211002152 A CN 202211002152A CN 115376834 A CN115376834 A CN 115376834A
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- poisson ratio
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- 239000003990 capacitor Substances 0.000 title claims abstract description 18
- 239000011149 active material Substances 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 241000219492 Quercus Species 0.000 claims description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 239000011245 gel electrolyte Substances 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- 238000007650 screen-printing Methods 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 8
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 230000001351 cycling effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a super capacitor with a negative Poisson ratio characteristic and an oak leaf imitating structure, and belongs to the technical field of flexible electronics. The flexible electrode comprises an upper layer, a lower layer and an intermediate dielectric layer; the flexible electrode comprises a current collector layer, an active material layer and a flexible substrate layer; the current collector layer and the active material layer are of a negative Poisson ratio structure, the negative Poisson ratio structure is similar to the shape of an oak leaf and consists of four oak leaf units and four embedded units. The oak leaf unit provides a large tensile deformation amount for the super capacitor, the negative Poisson ratio structure provides a strong tensile characteristic for the super capacitor, the tensile stress is reduced, and the falling of an electrode layer and the generation of cracks are prevented. The electrode has novel structure and very high tensile deformation capability, and simultaneously has smaller stress under various deformations such as tension, compression, bending, distortion and the like, so that the electrode has stronger mechanical property and cycling stability.
Description
Technical Field
The invention belongs to the technical field of flexible electronics, and particularly relates to a super capacitor with a negative Poisson ratio characteristic and an oak-leaf-imitated structure.
Background
Flexible electronics have important roles in wearable displays, biomedical applications, soft body robots, etc., and can meet special functional uses or product experiences if they can be bent, twisted and stretched. The circuits of existing electronic devices become more and more flexible, but the supercapacitors powering them do not meet the requirements of flexibility. The existing super capacitor is mainly characterized in that stretchability and deformation stability are improved on materials, and an electrode without a special structure is adopted, but the existing super capacitor is poor in performance under high-strength stretching and bending deformation and cannot meet the requirements of practical use. Therefore, how to optimize the electrode mechanism of the supercapacitor and improve the stability of the supercapacitor is a major problem to be solved urgently.
Based on the problems, the invention provides a super capacitor with a negative Poisson ratio characteristic and an oak leaf imitating structure. The flexible electrode comprises an upper layer, a lower layer and an intermediate dielectric layer; the flexible electrode comprises a current collector layer, an active material layer and a flexible substrate layer; the current collector layer and the active material layer are of a negative Poisson ratio structure, the negative Poisson ratio structure is similar to the shape of an oak leaf and consists of four oak leaf units and four embedded units. The oak leaf unit provides a large tensile deformation amount for the super capacitor, the negative Poisson ratio structure provides a strong tensile characteristic for the super capacitor, the tensile stress is reduced, and the falling of an electrode layer and the generation of cracks are prevented. The realization of the above parts enables the invention to have very high tensile deformation capability, and meanwhile, the stress borne by the electrode is small under various deformations such as tension, compression, bending and distortion, so that the invention has strong mechanical property and cycling stability. The problems of poor stability and large voltage output fluctuation of the conventional super capacitor are solved.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a supercapacitor with an oak-leaf-like structure having a negative poisson's ratio characteristic, so as to solve the problem that the output voltage of the supercapacitor is unstable under the action of repeated stretching and bending loads, and particularly, the current collector layer and the active material layer fall off or microcrack is generated under the action of repeated stretching and bending loads, thereby seriously affecting the output stability.
In order to realize the purpose, the invention adopts the technical scheme that: the flexible electrode comprises an upper layer, a lower layer and an intermediate dielectric layer; the flexible electrode comprises a current collector layer, an active material layer and a flexible substrate layer; the current collector layer is printed on the flexible substrate layer in a screen printing mode and is used for collecting current generated by the active material layer; the active material layer is printed on the current collector layer in a screen printing mode and is used for adsorbing moving ions; the current collector layer and the active material layer are of a negative Poisson ratio structure, the negative Poisson ratio structure is similar to the shape of oak leaves and consists of four oak leaf units and four embedded units; the oak leaf units and the embedding units are connected with each other, and each embedding unit is connected with other embedding units through two or four oak leaf units; the embedded units are composed of a rectangle with the length of 4-4.5 mm and the width of 1.5-2 mm, the distance between the long sides of each embedded unit is 5-5.5 mm, and the distance between the short sides of each embedded unit is 2.5-3 mm; the curve height of the oak leaf unit is 2.5-2.75 mm, the width of the oak leaf unit is 0.175-0.2 mm, and the oak leaf unit is used for reducing peak stress and improving the tensile rate.
Further, preferably, the intermediate dielectric layer is made of a gel electrolyte and has a thickness of 0.25 to 0.35mm; the gel electrolyte is prepared from phosphoric acid, polyvinyl alcohol (PVA) and deionized water according to the weight ratio of 1:1:10 in proportion; the current collector layer is 0.05-0.1 mm in thickness and is made of conductive silver paste; the active material layer is prepared from carbon nanotubes and graphene oxide according to the weight ratio of 1:1, the thickness is 0.1-0.2 mm; the thickness of the flexible substrate layer is 0.1-0.125 mm, and a polyurethane (TPU) film is adopted.
The invention has the beneficial effects that:
the invention relates to a super capacitor with a negative Poisson ratio characteristic and an oak leaf imitating structure, and belongs to the technical field of flexible electronics. The flexible electrode comprises an upper layer, a lower layer and an intermediate dielectric layer; the flexible electrode comprises a current collector layer, an active material layer and a flexible substrate layer; the current collector layer and the active material layer are of a negative Poisson ratio structure, the negative Poisson ratio structure is similar to the shape of an oak leaf and consists of four oak leaf units and four embedded units. The oak leaf unit provides a large tensile deformation amount for the super capacitor, the negative Poisson ratio structure provides a strong tensile characteristic for the super capacitor, the tensile stress is reduced, and the falling of an electrode layer and the generation of cracks are prevented. The electrode has novel structure and very high tensile deformation capability, and simultaneously has smaller stress under various deformations such as tension, compression, bending, distortion and the like, so that the electrode has stronger mechanical property and cycling stability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a structural component diagram of the present invention;
FIG. 3 is a structural diagram of an electrode having a negative Poisson ratio characteristic of an imitation oak leaf structure of the present invention;
FIG. 4 is an enlarged view of a cell of the oak-leaf-like structure electrode of the present invention having a negative Poisson's ratio characteristic;
FIG. 5 is a schematic representation of an electrode of the present invention having a negative Poisson ratio characteristic oak leaf-like structure under bending, torsion and tensile deformation;
FIG. 6 is a comparison curve of tensile stress between an electrode with a negative Poisson ratio characteristic and an electrode with an imitated oak leaf structure of the invention and the electrode with a conventional negative Poisson ratio structure;
FIG. 7 is a graph of CV curves at various bend angles in accordance with the present invention;
FIG. 8 is a graph of CV curves for different scan rates in accordance with the present invention.
Wherein: the solar cell comprises a flexible substrate layer 1, a current collector layer 2, an active material layer 3, an intermediate dielectric layer 4, an embedded unit 5 and an oak leaf unit 6.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the drawings are provided solely for the purpose of providing a further understanding of the invention by those skilled in the art and are not intended to limit the invention in any way.
As shown in fig. 1-4, a super capacitor with a negative poisson ratio characteristic and an oak-leaf-like structure is characterized by comprising upper and lower layers of flexible electrodes and an intermediate dielectric layer 4; the flexible electrode comprises a current collector layer 5, an active material layer 3 and a flexible substrate layer 1; the current collector layer 5 is printed on the flexible substrate layer 1 in a screen printing mode and is used for collecting the current generated by the active material layer 3; the active material layer 3 is printed on the current collector layer 2 by a screen printing mode and is used for adsorbing moving ions; the current collector layer 2 and the active material layer 3 are of a negative Poisson ratio structure, the negative Poisson ratio structure is similar to the shape of oak leaves and consists of four oak leaf units 6 and four embedded units 5; the oak leaf units 6 and the embedding units 5 are mutually connected, and each embedding unit 5 is connected with other embedding units 5 through two or four oak leaf units 6; the embedded units 5 are composed of a rectangle with the length of 4-4.5 mm and the width of 1.5-2 mm, the distance between the long sides of each embedded unit 5 is 5-5.5 mm, and the distance between the short sides is 2.5-3 mm; the curve height of the oak leaf unit 6 is 2.5-2.75 mm, the width is 0.175-0.2 mm, and the oak leaf unit is used for reducing peak stress and improving the tensile rate.
The middle dielectric layer 4 is made of gel electrolyte and has the thickness of 0.25-0.35 mm; the gel electrolyte is prepared from phosphoric acid, polyvinyl alcohol (PVA) and deionized water according to the weight ratio of 1:1:10 in proportion; the current collector layer 2 is 0.05-0.1 mm thick and is made of conductive silver paste; the active material layer 3 is prepared from carbon nanotubes and graphene oxide according to the ratio of 1:1, the thickness is 0.1-0.2 mm; the thickness of the flexible substrate layer 1 is 0.1-0.125 mm, and a polyurethane (TPU) film is adopted.
In order to show the states of the electrode with the negative poisson ratio characteristic and the oak leaf-like structure under different deformation conditions, as shown in fig. 5, the structural schematic diagram of the electrode under different deformation conditions is schematically depicted.
In order to further verify the advantages of the present invention, the mechanical property simulation analysis is performed on the negative poisson's ratio structure of the present invention, and the analysis result is shown in fig. 6, when the tensile deformation is 10%, compared with the existing negative poisson's ratio structure, the maximum tensile stress of the present invention is reduced by 95%.
Meanwhile, in order to further verify the advantages of the super capacitor, CV curves of the invention are measured, and the results are shown in FIGS. 7 and 8, wherein FIG. 7 is a CV curve graph of the invention at different bending angles, each curve is highly overlapped, and the invention is proved to have very high stability under different deformations, FIG. 8 is a CV curve graph of the invention at different scanning speeds, the shape of the CV curve graph is similar to a rectangle, and the invention is proved to have good capacitance behavior, and the area specific capacitance is up to 25mF/cm under the scanning speed of 200Mv/s 2 。
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (2)
1. A super capacitor with a negative Poisson ratio characteristic and an oak leaf imitating structure is characterized by comprising upper and lower layers of flexible electrodes and an intermediate dielectric layer; the flexible electrode comprises a current collector layer, an active material layer and a flexible substrate layer; the current collector layer is printed on the flexible substrate layer in a screen printing mode and is used for collecting current generated by the active material layer; the active material layer is printed on the current collector layer in a screen printing mode and is used for adsorbing moving ions; the current collector layer and the active material layer are of a negative Poisson ratio structure, the negative Poisson ratio structure is similar to the shape of oak leaves and consists of four oak leaf units and four embedded units; the oak leaf units and the embedding units are connected with each other, and each embedding unit is connected with other embedding units through two or four oak leaf units; the embedded units are composed of a rectangle with the length of 4-4.5 mm and the width of 1.5-2 mm, the distance between the long sides of each embedded unit is 5-5.5 mm, and the distance between the short sides of each embedded unit is 2.5-3 mm; the curve height of the oak leaf unit is 2.5-2.75 mm, the width of the oak leaf unit is 0.175-0.2 mm, and the oak leaf unit is used for reducing peak stress and improving the tensile rate.
2. The supercapacitor with the negative Poisson ratio characteristic imitation oak-leaf structure according to claim 1, wherein the middle dielectric layer is made of gel electrolyte and has a thickness of 0.25-0.35 mm; the gel electrolyte is made of phosphoric acid H 3 PO 4 Polyvinyl alcohol PVA and deionized water were mixed according to a 1:1:10 in proportion; the current collector layer is 0.05-0.1 mm in thickness and is made of conductive silver paste; the active material layer is prepared from carbon nanotubes and graphene oxide according to the weight ratio of 1:1, the thickness is 0.1-0.2 mm; the thickness of the flexible substrate layer is 0.1-0.125 mm, and a polyurethane (TPU) film is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211002152.6A CN115376834B (en) | 2022-08-21 | 2022-08-21 | Super capacitor with negative poisson ratio characteristic oak leaf imitation structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211002152.6A CN115376834B (en) | 2022-08-21 | 2022-08-21 | Super capacitor with negative poisson ratio characteristic oak leaf imitation structure |
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| Publication Number | Publication Date |
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| CN115376834A true CN115376834A (en) | 2022-11-22 |
| CN115376834B CN115376834B (en) | 2024-06-04 |
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| CN202211002152.6A Active CN115376834B (en) | 2022-08-21 | 2022-08-21 | Super capacitor with negative poisson ratio characteristic oak leaf imitation structure |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1803420A1 (en) * | 2005-12-28 | 2007-07-04 | Sorin Biomedica Cardio S.R.L. | Annuloplasty prosthesis with an auxetic structure |
| CN201344213Y (en) * | 2008-12-16 | 2009-11-11 | 任德睦 | Roller-type overrunning clutch of outer star wheel for loader |
| US20140315093A1 (en) * | 2013-04-16 | 2014-10-23 | California Institute Of Technology | Use and fabrication of microscaffolds and nanoscaffolds |
| CN105551827A (en) * | 2016-02-29 | 2016-05-04 | 西南大学 | Preparation method for all-solid-state supercapacitor combining layer-by-layer assembly of silk-screen printing |
| WO2018101724A1 (en) * | 2016-11-29 | 2018-06-07 | 서울대학교산학협력단 | Conductive flexible element |
| US20190225809A1 (en) * | 2018-01-25 | 2019-07-25 | Ut-Battelle, Llc | Lignin-based polymers with enhanced melt extrusion ability |
| KR20190090341A (en) * | 2018-01-24 | 2019-08-01 | 서울대학교산학협력단 | Capacitor type strain sensor and manufacturing method thereof |
| CN113237419A (en) * | 2021-05-14 | 2021-08-10 | 东南大学 | High-sensitivity flexible capacitive strain sensor and preparation method thereof |
-
2022
- 2022-08-21 CN CN202211002152.6A patent/CN115376834B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1803420A1 (en) * | 2005-12-28 | 2007-07-04 | Sorin Biomedica Cardio S.R.L. | Annuloplasty prosthesis with an auxetic structure |
| CN201344213Y (en) * | 2008-12-16 | 2009-11-11 | 任德睦 | Roller-type overrunning clutch of outer star wheel for loader |
| US20140315093A1 (en) * | 2013-04-16 | 2014-10-23 | California Institute Of Technology | Use and fabrication of microscaffolds and nanoscaffolds |
| CN105551827A (en) * | 2016-02-29 | 2016-05-04 | 西南大学 | Preparation method for all-solid-state supercapacitor combining layer-by-layer assembly of silk-screen printing |
| WO2018101724A1 (en) * | 2016-11-29 | 2018-06-07 | 서울대학교산학협력단 | Conductive flexible element |
| KR20190090341A (en) * | 2018-01-24 | 2019-08-01 | 서울대학교산학협력단 | Capacitor type strain sensor and manufacturing method thereof |
| US20190225809A1 (en) * | 2018-01-25 | 2019-07-25 | Ut-Battelle, Llc | Lignin-based polymers with enhanced melt extrusion ability |
| CN113237419A (en) * | 2021-05-14 | 2021-08-10 | 东南大学 | High-sensitivity flexible capacitive strain sensor and preparation method thereof |
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| CN115376834B (en) | 2024-06-04 |
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