CN109755025B - Capacitor electrode, preparation method and capacitor - Google Patents
Capacitor electrode, preparation method and capacitor Download PDFInfo
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- CN109755025B CN109755025B CN201910032210.1A CN201910032210A CN109755025B CN 109755025 B CN109755025 B CN 109755025B CN 201910032210 A CN201910032210 A CN 201910032210A CN 109755025 B CN109755025 B CN 109755025B
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Abstract
The embodiment of the invention provides a capacitor electrode, a preparation method and a capacitor, wherein the capacitor electrode comprises the following components: the carbon nanotube composite material comprises at least two-dimensional material sheet layers and at least one layer of carbon nanotubes, wherein one layer of carbon nanotubes is arranged between the two-dimensional material sheet layers. By using the embodiment of the invention, the working frequency band can be improved on the premise of ensuring the capacitance density.
Description
Technical Field
The embodiment of the invention relates to the technical field of micromachining and electrochemistry, in particular to a capacitor electrode, a preparation method and a capacitor.
Background
With the rapid development of wearable devices and internet of things, there are increasingly stringent requirements for the miniaturization and flexibility of electronic devices. Although the active transistor volume for logic computation is rapidly reduced with the continuous verification of moore's law in the last decades for circuits in electronic devices, the volume of other passive electronic components in the circuits, including resistors, capacitors, inductors, etc., is not reduced much. Among the passive components, the electrolytic capacitor is the single component which occupies the largest volume on the current circuit board. Its main function is to provide hundreds of microfarads or even millifarads of capacitance, and to provide the function of frequency screening in the frequency band around hundreds of hertz.
The capacitor in the prior art has a low working frequency band, and a new solution is urgently needed at present to ensure the working frequency band on the premise of ensuring the capacitance density.
Disclosure of Invention
Aiming at the technical problems in the prior art, the embodiment of the invention provides a capacitor electrode, a preparation method and a capacitor.
In a first aspect, an embodiment of the present invention provides a capacitor electrode, including: the carbon nanotube composite material comprises at least two-dimensional material sheet layers and at least one layer of carbon nanotubes, wherein one layer of carbon nanotubes is arranged between every two-dimensional material sheet layers.
In a second aspect, an embodiment of the present invention provides a method for preparing a capacitor electrode, including:
selecting a two-dimensional material to be dissolved in 20ml of LiF/HCl solution, and processing the obtained solution to obtain a stable dispersion liquid;
adding 0.1mg/mL carbon nanotube solution into the stable dispersion liquid, uniformly mixing and carrying out ultrasonic treatment for 1 hour;
and (3) placing the mixed solution into vacuum filtration equipment for filtration, and drying at room temperature to obtain the capacitor electrode as claimed in claim 1.
In a third aspect, an embodiment of the present invention provides a capacitor, including: the capacitor comprises a first electrode, a second electrode and a filter membrane, wherein the first electrode, the second electrode and the filter membrane are packaged into a thin film device with a sandwich structure, and the first electrode and the second electrode are the capacitor electrodes.
The capacitor electrode, the preparation method and the capacitor provided by the embodiment of the invention have the following advantages that: the carbon nanotube composite material comprises at least two-dimensional material sheet layers and at least one carbon nanotube, wherein a layer of the carbon nanotube is arranged between every two-dimensional material sheet layers. By using the embodiment of the invention, the working frequency band can be improved on the premise of ensuring the capacitance density.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a capacitor electrode according to an embodiment of the present invention;
fig. 2a is a transmission electron micrograph of a single-layer metal alkene material according to an embodiment of the present invention;
FIG. 2b is a schematic cross-sectional view of a composite electrode provided in accordance with an embodiment of the present invention;
FIGS. 2c-2e are schematic cross-sectional views of carbon nanotube composite electrodes with different ratios according to embodiments of the present invention;
FIG. 2f is a contrast diagram of an X-ray diffraction pattern of a composite electrode of carbon nanotubes in different proportions according to an embodiment of the present invention;
FIG. 3a is an impedance spectroscopy curve for a composite electrode doped with 0% wt, 0.3% wt and 2% wt carbon nanotubes according to an embodiment of the present invention;
FIG. 3b is a graph showing the relationship between the phase and the frequency of three electrodes doped with 0 wt%, 0.3 wt% and 2 wt% of carbon nanotubes according to an embodiment of the present invention;
FIG. 3c is a graph of capacitance versus frequency for three electrodes incorporating 0% wt, 0.3% wt and 2% wt carbon nanotubes according to an embodiment of the present invention;
fig. 3d is a graph comparing frequency performance of electrodes with different carbon nanotube contents according to an embodiment of the present invention.
Reference numerals:
1-a composite electrode doped with 0% wt of carbon nanotubes;
2-a composite electrode doped with 0.3% wt of carbon nanotubes;
3-composite electrode doped with 2% wt of carbon nanotubes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a capacitor electrode according to an embodiment of the present invention, and as shown in fig. 1, the capacitor electrode includes at least two-dimensional material sheets and at least one carbon nanotube, where one layer of the carbon nanotube is located between each two-dimensional material sheets.
Because the frequency response of the super capacitor is limited by the diffusion speed of ions, the diffusion speed of the ions in the liquid phase is two orders of magnitude higher than that of the solid phase, all atoms of the two-dimensional material are on the surface, and the problem of low reaction rate does not exist because the two-dimensional material is used for the electrodes without ion solid phase diffusion. Therefore, the embodiment of the invention provides a technical scheme for providing large capacitance at high frequency by using a two-dimensional conductive pseudocapacitance material.
The embodiment of the invention provides a capacitor electrode which comprises at least two-dimensional material sheet layers and at least one carbon nano tube, wherein one layer of the carbon nano tube is arranged between every two-dimensional material sheet layers.
For example, there may be a layer of carbon nanotubes between two-dimensional material sheets, or there may be two layers of carbon nanotubes between three two-dimensional material sheets, and there is a layer of carbon nanotubes between each two-dimensional material sheets, and so on. The design can be designed according to the actual situation, as shown in fig. 2a and fig. 2 b.
By utilizing the intercalation structure of the electrode provided by the embodiment of the invention, the interlayer spacing (equivalent aperture) is positively correlated with the content of the carbon nano tube. According to experimental tests, the prepared electrode can still maintain 6mF/cm at 120Hz2The capacitance density of (a).
The capacitor electrode provided by the embodiment of the invention comprises: the carbon nanotube composite material comprises at least two-dimensional material sheet layers and at least one carbon nanotube, wherein a layer of the carbon nanotube is arranged between every two-dimensional material sheet layers. By using the embodiment of the invention, the working frequency band can be improved on the premise of ensuring the capacitance density.
Preferably, the two-dimensional material is Ti3C2Tx。
Based on the above examples, among the many two-dimensional materials, Ti in the transition metal carbide group is preferred3C2Tx. On the one hand, Ti3C2TxHas a conductivity exceeding that of reduced graphene oxide while also exhibiting a conductivity exceeding 900F/m3The specific capacitance of (d); on the other hand, Ti3C2TxHas relatively good stability, cycle performance and wettability.
The embodiment of the invention also provides a preparation method of the capacitor electrode, which comprises the following steps:
selecting a two-dimensional material to be dissolved in 20ml of LiF/HCl solution, and processing the obtained solution to obtain a stable dispersion liquid;
adding 0.1mg/mL carbon nanotube solution into the stable dispersion liquid, uniformly mixing and carrying out ultrasonic treatment for 1 hour;
and placing the mixed solution in vacuum filtration equipment for filtration, and drying at room temperature to obtain the capacitor electrode.
On the basis of the above embodiments, specifically, the embodiments of the present invention are specifically described by the following examples:
(1) selecting 1g of ceramic phase material Ti3C2TxAs a precursor, slowly putting the precursor into 20mL LiF/HCl solution (prepared by 1g LiF powder and 20mL 9M HCl), and then putting the precursor in an environment of 35 ℃ for 24 hours;
(2) centrifuging the obtained solution at 4500 for 5 min, removing supernatant, adding deionized water, and repeating the above centrifuging process for 5 times;
(3) diluting the obtained solution by 50 times with deionized water, and then performing ultrasonic treatment for 2 hours by using a cell crusher to obtain a stable dispersion liquid;
(4) adding 0.1mg/mL carbon nanotube solution, uniformly mixing and carrying out ultrasonic treatment for 1 hour;
(5) and (3) placing the mixed solution into vacuum filtration equipment for filtration, or directly placing the mixed solution on a conductive filter membrane or a common filter membrane and then transferring the mixed solution to a conductive substrate, and then drying the conductive substrate at room temperature to obtain the capacitor electrode.
Fig. 2c-2e are schematic cross-sectional views of carbon nanotube composite electrodes with different proportions according to embodiments of the present invention, which clearly show that as the content of the carbon nanotubes increases, the equivalent pore spacing increases significantly, so that ions diffuse rapidly, and the operating frequency band becomes higher.
Fig. 2f is a comparison graph of X-ray diffraction patterns of composite electrodes of carbon nanotubes with different proportions, which is provided in the embodiment of the present invention, and it can be seen from fig. 2f that the (001) diffraction peak is shifted to the left after increasing the content of the carbon nanotubes, which is effective evidence of the increase of the interlayer distance.
From fig. 3a to fig. 3d, it can be known that the higher the mass percentage of the carbon nanotube content is, the higher the working frequency band of the electrode is, and the lower the capacity of the electrode is, and whether the electrode is working in the working frequency band can be known by determining whether the phase angle is close to 90 °.
According to the preparation method of the capacitor electrode provided by the embodiment of the invention, the working frequency band can be improved by using the capacitor electrode prepared by the embodiment of the invention on the premise of ensuring the capacitance density.
An embodiment of the present invention further provides a capacitor, including: the capacitor comprises a first electrode, a second electrode and a filter membrane, wherein the first electrode, the second electrode and the filter membrane are packaged into a thin film device with a sandwich structure, and the first electrode and the second electrode are the capacitor electrodes.
The capacitor provided by the embodiment of the invention comprises: the capacitor comprises a first electrode, a second electrode and a filter membrane, wherein the first electrode, the second electrode and the filter membrane are packaged into a thin film device with a sandwich structure, and the first electrode and the second electrode are the capacitor electrodes. By using the embodiment of the invention, the working frequency band can be improved on the premise of ensuring the capacitance density.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A capacitor electrode, comprising: the carbon nanotube composite material comprises at least two-dimensional material sheet layers and at least one layer of carbon nanotubes, wherein one layer of carbon nanotubes is arranged between every two-dimensional material sheet layers;
the frequency response range of the capacitor electrode is positively correlated with the distance between the two-dimensional material sheets, and the distance between the two-dimensional material sheets is positively correlated with the content of the carbon nano tube;
by increasing the concentration of carbon nanotubes to 0.3% wt, the capacitor electrode was maintained at a capacitance density of 6mF/cm2 at 120 Hz.
2. The capacitor electrode of claim 1, wherein the two-dimensional material is Ti3C2Tx。
3. The method for preparing the capacitor electrode according to claim 1, which comprises the following steps:
selecting a two-dimensional material to be dissolved in 20ml of LiF/HCl solution, and processing the obtained solution to obtain a stable dispersion liquid;
adding 0.1mg/mL carbon nanotube solution into the stable dispersion liquid, uniformly mixing and carrying out ultrasonic treatment for 1 hour;
and (3) placing the mixed solution into vacuum filtration equipment for filtration, and drying at room temperature to obtain the capacitor electrode as claimed in claim 1.
4. A capacitor, comprising: the thin film device comprises a first electrode, a second electrode and a filter membrane, wherein the first electrode, the second electrode and the filter membrane are packaged into a thin film device with a sandwich structure, and the first electrode and the second electrode are capacitor electrodes as claimed in claim 1.
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| CN110438799B (en) * | 2019-08-19 | 2020-11-03 | 北京化工大学 | Fabric material and preparation method thereof |
| CN112795209B (en) * | 2019-11-14 | 2021-11-30 | 清华大学 | Two-dimensional titanium carbide film with stable environment and excellent conductivity and mechanical property, and preparation method and application thereof |
| CN113764198B (en) * | 2021-08-19 | 2022-08-09 | 西安交通大学 | Reduced graphene oxide/MXene porous flexible membrane electrode and preparation method and application thereof |
| CN115000410B (en) * | 2022-07-07 | 2023-12-26 | 桂林理工大学 | Positive electrode material of lithium-sulfur battery |
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