CN115376834B - Super capacitor with negative poisson ratio characteristic oak leaf imitation structure - Google Patents
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- CN115376834B CN115376834B CN202211002152.6A CN202211002152A CN115376834B CN 115376834 B CN115376834 B CN 115376834B CN 202211002152 A CN202211002152 A CN 202211002152A CN 115376834 B CN115376834 B CN 115376834B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 15
- 241000219492 Quercus Species 0.000 claims abstract description 39
- 239000011149 active material Substances 0.000 claims abstract description 23
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 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
- 239000000463 material Substances 0.000 claims description 4
- 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 9
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 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
Abstract
The invention relates to a super capacitor with a negative Poisson ratio characteristic and an oak leaf-like structure, and belongs to the technical field of flexible electronics. A flexible electrode comprising an upper layer and 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 which imitates the shape of oak leaves and consists of four oak leaf units and four embedded units. The oak leaf unit provides larger tensile deformation for the supercapacitor, and the negative poisson ratio structure provides stronger tensile characteristic for the supercapacitor, so that tensile stress is reduced, and the falling off of the electrode layer and the generation of cracks are prevented. The electrode has novel structure and very high stretching deformation capability, and meanwhile, the electrode is subjected to smaller stress under various deformation such as tension, compression, bending, torsion and the like, so that the electrode has stronger mechanical property and cyclical 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 simulated oak leaf structure.
Background
Flexible electronics play an important role in wearable displays, biomedical applications, soft robots, etc., and if flexible, twisted, and stretched, can meet specific functional uses or product experiences. The circuits of the existing electronic devices become more flexible, but the super-capacitor for supplying power to the circuits cannot meet the requirement of flexibility. The existing super capacitor is mainly used for improving stretchability and deformation stability on materials and adopts an electrode without a special structure, but the existing super capacitor is poor in performance under high-strength stretching and bending deformation and cannot meet the requirements of actual use, and the main factors are that the electrode in the super capacitor is easy to fall off or generate microcracks under the action of repeated stretching and bending loads, so that the performance of the super capacitor is influenced, and stable voltage output cannot be provided. Therefore, how to optimize the electrode mechanism of the supercapacitor and improve the stability of the supercapacitor are important problems to be solved.
Based on the problems, the invention provides the supercapacitor with the negative poisson ratio characteristic and the oak leaf-like structure. A flexible electrode comprising an upper layer and 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 which imitates the shape of oak leaves and consists of four oak leaf units and four embedded units. The oak leaf unit provides larger tensile deformation for the supercapacitor, and the negative poisson ratio structure provides stronger tensile characteristic for the supercapacitor, so that tensile stress is reduced, and the falling off of the electrode layer and the generation of cracks are prevented. The realization of the parts ensures that the invention has very high tensile deformation capability, and simultaneously, the electrode has smaller stress under various deformation such as tension, compression, bending, torsion and the like, so that the invention has stronger mechanical property and cycle stability. The problems of poor stability and large voltage output fluctuation of the existing super capacitor are solved.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the super capacitor with the negative poisson ratio characteristic and the oak leaf-like structure, so as to solve the problem that the output voltage of the super capacitor is unstable under the action of repeated stretching and bending load, and particularly the current collector layer and the active material layer fall off or generate microcracks under the action of repeated stretching and bending load, so that the output stability is seriously influenced.
In order to achieve the above purpose, the invention adopts the following technical scheme: a flexible electrode comprising an upper layer and 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 which imitates the shape of oak leaves and consists of four oak leaf units and four embedded units; the oak leaf units are connected with the embedded units, and each embedded unit is connected with other embedded units through two or four oak leaf units; the embedded units are formed by rectangles 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 is 2.5-3 mm; the curve of the oak leaf unit is 2.5-2.75 mm in height and 0.175-0.2 mm in width, and is used for reducing peak stress and improving the stretching 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 following ratio of 1:1:10, mixing the materials in proportion; the thickness of the current collector layer is 0.05-0.1 mm, and the current collector layer is formed by conductive silver paste; the active material layer is prepared from carbon nanotubes and graphene oxide according to the following ratio of 1:1, and 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-like structure, and belongs to the technical field of flexible electronics. A flexible electrode comprising an upper layer and 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 which imitates the shape of oak leaves and consists of four oak leaf units and four embedded units. The oak leaf unit provides larger tensile deformation for the supercapacitor, and the negative poisson ratio structure provides stronger tensile characteristic for the supercapacitor, so that tensile stress is reduced, and the falling off of the electrode layer and the generation of cracks are prevented. The electrode has novel structure and very high stretching deformation capability, and meanwhile, the electrode is subjected to smaller stress under various deformation such as tension, compression, bending, torsion and the like, so that the electrode has stronger mechanical property and cyclical stability.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a structural diagram of the present invention;
FIG. 3 is a diagram of an electrode structure of the present invention with a negative Poisson's ratio characteristic oak leaf like structure;
FIG. 4 is an enlarged cell view of an electrode of the present invention having a negative Poisson's ratio characteristic oak leaf-like structure;
FIG. 5 is a schematic representation of an electrode of the present invention having a negative Poisson's ratio characteristic oak leaf-like structure under bending, torsion and tensile deformation;
FIG. 6 is a graph of tensile stress versus prior art negative poisson's ratio electrode with a negative poisson's ratio characteristic simulated oak leaf structure of the present invention;
FIG. 7 is a graph of CV curves at different bend angles for the present invention;
FIG. 8 is a graph of CV curves for different scan rates of the present invention.
Wherein: a flexible substrate layer 1, a current collector layer 2, an active material layer 3, an intermediate dielectric layer 4, an embedded unit 5, an oak leaf unit 6.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the drawings are provided only for the purpose of further understanding of the present invention by those skilled in the art, and are not intended to limit the present invention in any way.
As shown in fig. 1-4, a supercapacitor with a negative poisson ratio characteristic and an oak leaf-like structure is characterized by comprising upper and lower flexible electrodes and an intermediate dielectric layer 4; the flexible electrode comprises a current collector layer 2, an active material layer 3 and a flexible substrate layer 1; the current collector layer 2 is printed on the flexible substrate layer 1 in a screen printing mode and is used for collecting current generated by the active material layer 3; the active material layer 3 is printed on the current collector layer 2 in 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 which imitates 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 embedded units 5 are connected with each other, and each embedded unit 5 is connected with other embedded units 5 through two or four oak leaf units 6; the embedded units 5 are formed by rectangles 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 of the oak leaf unit 6 is 2.5-2.75 mm in height and 0.175-0.2 mm in width, and is used for reducing peak stress and improving the stretching rate.
The middle dielectric layer 4 is composed 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 following ratio of 1:1:10, mixing the materials in proportion; the thickness of the current collector layer 2 is 0.05-0.1 mm, and the current collector layer is formed by conductive silver paste; the active material layer 3 is prepared from carbon nanotubes and graphene oxide according to the following ratio of 1:1, and 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.
To demonstrate the state of an electrode with a negative poisson's ratio characteristic in a oak leaf like structure under different deformation conditions, a schematic diagram of the structure of the electrode under different deformation conditions is schematically depicted as shown in fig. 5.
In order to further verify the advantages of the invention, the mechanical performance simulation analysis is carried out on the negative poisson ratio structure, the analysis result is shown in figure 6, and when the tensile deformation is 10%, compared with the existing negative poisson ratio structure, the maximum tensile stress of the 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 figures 7 and 8, wherein figure 7 is a CV curve diagram of the invention at different bending angles, each curve is highly overlapped, the invention has very high stability under different deformations, figure 8 is a CV curve diagram of the invention at different scanning rates, the shape is similar to a rectangle, the invention has good capacitance behavior, and the area ratio capacitance is as high as 25mF/cm 2 at the scanning rate of 200 Mv/s.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (2)
1. The super capacitor with the negative poisson ratio characteristic and the oak leaf-like structure is characterized by comprising an upper flexible electrode, a lower flexible electrode 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 which imitates the shape of oak leaves and consists of four oak leaf units and four embedded units; the oak leaf units are connected with the embedded units, and each embedded unit is connected with other embedded units through two or four oak leaf units; the embedded units are formed by rectangles 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 is 2.5-3 mm; the curve of the oak leaf unit is 2.5-2.75 mm in height and 0.175-0.2 mm in width, and is used for reducing peak stress and improving the stretching rate.
2. The supercapacitor with the negative poisson ratio characteristic simulated oak leaf structure according to claim 1, wherein the middle dielectric layer is composed of gel electrolyte and has a thickness of 0.25-0.35 mm; the gel electrolyte is prepared from phosphoric acid H 3PO4, polyvinyl alcohol PVA and deionized water according to the following ratio of 1:1:10, mixing the materials in proportion; the thickness of the current collector layer is 0.05-0.1 mm, and the current collector layer is formed by conductive silver paste; the active material layer is prepared from carbon nanotubes and graphene oxide according to the following ratio of 1:1, and 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 | Super capacitor with negative poisson ratio characteristic oak leaf imitation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211002152.6A CN115376834B (en) | 2022-08-21 | Super capacitor with negative poisson ratio characteristic oak leaf imitation structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115376834A CN115376834A (en) | 2022-11-22 |
| CN115376834B true CN115376834B (en) | 2024-06-04 |
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Citations (6)
| 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 |
| 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 |
| CN113237419A (en) * | 2021-05-14 | 2021-08-10 | 东南大学 | High-sensitivity flexible capacitive strain sensor and preparation method thereof |
Patent Citations (6)
| 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 |
| 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 |
| CN113237419A (en) * | 2021-05-14 | 2021-08-10 | 东南大学 | High-sensitivity flexible capacitive strain sensor and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| Xu Jianxin.Screen-printed highly stretchable and stable flexible electrodes with a negative Poisson's ratio structure for supercapacitors.NANOSCALE.第15卷(第3期),1260-1272. * |
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