CN110828197B - Solid laminated interdigital electrochemical capacitor and preparation method thereof - Google Patents

Solid laminated interdigital electrochemical capacitor and preparation method thereof Download PDF

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CN110828197B
CN110828197B CN201911068720.0A CN201911068720A CN110828197B CN 110828197 B CN110828197 B CN 110828197B CN 201911068720 A CN201911068720 A CN 201911068720A CN 110828197 B CN110828197 B CN 110828197B
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active self
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CN110828197A (en
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韩方明
林豆
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Hefei Institutes of Physical Science of CAS
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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
    • 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
    • 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
    • H01G11/36—Nanostructures, e.g. nanofibres, nanotubes or fullerenes
    • 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
    • H01G11/56—Solid electrolytes, e.g. gels; Additives therein
    • 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
    • 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

Abstract

The invention discloses a solid laminated interdigital electrochemical capacitor and a preparation method thereof. The capacitor is formed by alternately superposing active self-supporting electrodes and an electrolyte layer, and the two adjacent electrodes are respectively electrically connected with a positive electrode lead-out terminal and a negative electrode lead-out terminal in a back-to-back manner, wherein the electrodes are MXene titanium carbide films or MXene carbon nanotube composite films or MXene graphene composite films, and the electrolyte layer is gel electrolyte; the method comprises the steps of firstly coating the gel electrolyte on the upper surface of an active self-supporting electrode, then placing the active self-supporting electrode in vacuum for 1min, then pasting the other electrode on one surface of the gel electrolyte of the upper electrode, then coating the gel electrolyte on the surface of the gel electrolyte, placing the gel electrolyte in vacuum for 1min, then repeating the process for more than zero times, then pasting the other electrode on one surface of the gel electrolyte of the multilayer electrode, and then electrically connecting the electrodes at two ends of the obtained intermediate product with the positive electrode lead-out terminal and the negative electrode lead-out terminal respectively to obtain the product. It is extremely easy to commercialize widely as an auxiliary power supply, a backup power supply, a main power supply, and an alternative power supply.

Description

Solid laminated interdigital electrochemical capacitor and preparation method thereof
Technical Field
The invention relates to an electrochemical capacitor and a preparation method thereof, in particular to a solid-state laminated interdigital electrochemical capacitor and a preparation method thereof.
Background
The electrochemical capacitor is also called as a super capacitor, and has the characteristics of high capacity, high energy density, large current charge and discharge, long cycle life and the like, and is successfully applied in the fields of national defense, aerospace, automobile industry, consumer electronics, communication, electric power, railways and the like, and the application range of the electrochemical capacitor is continuously expanded. The electrochemical capacitor can be mainly used as an auxiliary power source, a backup power source, a main power source, and an alternative power source according to the magnitude of the capacitance, the discharge time, and the discharge amount. Recently, in order to obtain electrochemical capacitors with higher performance, there have been continuous efforts, such as a super capacitor and a method for manufacturing the same, which are disclosed in the patent CN 103762088B of china in 7.7.7.2017. The super capacitor described in the patent of the invention is characterized in that a diaphragm and electrolyte are arranged between active self-supporting electrodes with one side printed with a conductive current collecting metal grid line in a packaging shell, wherein two adjacent active self-supporting electrodes are respectively oppositely connected with a positive electrode lead-out terminal and a negative electrode lead-out terminal; the preparation method comprises the steps of printing a metal grid line, connecting a leading-out electrode end, placing a diaphragm lamination, pre-packaging, injecting liquid, packaging and standing. Firstly, a conductive current collecting metal grid line needs to be printed on an active self-supporting electrode in a product, the structural complexity of the super capacitor is increased, a large amount of conductive agent and binder are used for ensuring that the active self-supporting electrode is in good contact with the conductive current collecting metal grid line, and the use of the inactive materials, namely the current collector, the conductive agent, the binder and the like occupies a large mass ratio and a large volume ratio in the whole electrochemical capacitor, so that the overall performance, namely the capacitance, the energy density and the power density of the product are reduced; secondly, the preparation method cannot obtain a product in which the active material has a higher mass ratio and volume ratio.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a solid laminated interdigital electrochemical capacitor with higher mass ratio and volume ratio of active materials.
The invention also provides a preparation method of the solid-state laminated interdigital electrochemical capacitor.
In order to solve the technical problem of the invention, the technical scheme is that the solid laminated interdigital electrochemical capacitor consists of an active self-supporting electrode, an electrolyte layer and an electrode leading-out terminal, and particularly comprises the following components in percentage by weight:
the active self-supporting electrode and the electrolyte layer are alternately superposed;
the two adjacent active self-supporting electrodes alternately superposed with the electrolyte layer are respectively and electrically connected with the positive electrode leading-out terminal and the negative electrode leading-out terminal in a back-to-back manner;
the active self-supporting electrode is MXene titanium carbide (Ti)3C2Tx) A film, or an MXene carbon nanotube composite film, or an MXene graphene composite film;
the electrolyte layer is a gel electrolyte.
As a further improvement of the solid state stacked interdigitated electrochemical capacitor:
preferably, the solid-state laminated interdigital electrochemical capacitor is externally provided with an encapsulation outer sleeve.
Preferably, the number of layers of the active self-supporting electrode and the active self-supporting electrode in the electrolyte layer alternately stacked is 3 or more.
Preferably, the conductivity of the active self-supporting electrode is more than or equal to 2000S/cm, and the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer.
Preferably, the gel electrolyte is polyvinyl alcohol-sulfuric acid (PVA-H)2SO4) Gel electrolytes, or polyvinyl alcohol-phosphoric acid (PVA-H)3PO4) A gel electrolyte, or a polyvinyl alcohol-potassium hydroxide (PVA-KOH) gel electrolyte.
In order to solve another technical problem of the present invention, another technical solution is adopted in that the method for manufacturing the solid-state stacked interdigital electrochemical capacitor comprises the steps of arranging an active self-supporting electrode, an electrolyte layer and an electrode lead-out terminal, and particularly comprises the following main steps:
step 1, firstly coating gel electrolyte with the thickness of 20-40 mu m on the upper surface of the active self-supporting electrode, and then placing the active self-supporting electrode in vacuum for at least 1min to obtain the active self-supporting electrode with the gel electrolyte soaked on the upper surface;
step 2, firstly, attaching another active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, coating the gel electrolyte with the thickness of 20-40 mu m on the surface of the active self-supporting electrode, and then placing the active self-supporting electrode in vacuum for at least 1min to obtain a plurality of layers of active self-supporting electrodes with the surfaces soaked with the gel electrolyte;
and 3, repeating the process of the step 2 for more than zero times, attaching another active self-supporting electrode to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, to obtain an intermediate product, and electrically connecting the active self-supporting electrodes at two ends of the intermediate product with the positive electrode lead-out terminal and the negative electrode lead-out terminal respectively to obtain the solid laminated interdigital electrochemical capacitor.
As a further improvement of the method of preparation of the solid state stacked interdigitated electrochemical capacitor:
preferably, the solid state stacked interdigitated electrochemical capacitor is encapsulated in an encapsulating jacket.
Preferably, the vacuum is less than-0.08 MPa.
Preferably, the conductivity of the active self-supporting electrode is more than or equal to 2000S/cm, and the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer.
Preferably, the gel electrolyte is a polyvinyl alcohol-sulfuric acid gel electrolyte, or a polyvinyl alcohol-phosphoric acid gel electrolyte, or a polyvinyl alcohol-potassium hydroxide gel electrolyte.
Compared with the prior art, the beneficial effects are that:
first, with such a structure, the capacitor of the present invention has the following advantages:
(1) as the active self-supporting electrode adopts the MXene titanium carbide film or the MXene carbon nanotube composite film or the MXene graphene composite film, and the conductive current-collecting metal grid line is not required to be printed on the active self-supporting electrode, the use of a conductive agent and a binder is avoided, the volume ratio and the mass ratio of the active material are greatly increased, the manufacturing cost is greatly reduced, and the miniaturization of a target product is greatly facilitated;
(2) the preferred gel electrolyte laminated between the active self-supporting electrodes not only separates two adjacent active self-supporting electrodes, but also can carry out necessary charge transmission;
(3) the active self-supporting electrode and the gel electrolyte are arranged into a laminated interdigital structure, so that the relative area between the electrodes is increased, the ion transport path is shortened, high power output is obtained, the mass load of a single target product is realized, the ultrahigh performance, namely the surface specific capacitance, the surface energy density and the surface power density, is further realized, and the excellent body performance, namely the body specific capacitance, the body energy density and the body power density, of the electrode active material under the ultrahigh mass load is realized;
(4) the mass load of the electrode active material can be controlled by the number of the electrode units, so that the capacitance capacity of a single target product can be controlled, and the performance of the electrode active material, namely the capacitance, the energy density and the bulk power density, is not influenced;
secondly, the performance of the target product is tested for multiple times and multiple batches by using an electrochemical workstation, and the result shows that the parameter indexes of the electrochemical workstation are superior to those of the prior art.
Thirdly, the preparation method of the invention is simple, scientific and efficient:
the solid-state laminated interdigital electrochemical capacitor which is a target product with higher mass ratio and volume ratio of the active material is prepared, and the solid-state laminated interdigital electrochemical capacitor has the characteristics of less raw materials, convenience in preparation, low production cost and easiness in industrial scale production; thereby making the desired product extremely susceptible to widespread commercial use as an auxiliary power source, a backup power source, a main power source, and an alternative power source.
Drawings
FIG. 1 shows one of the results of the characterization of the desired product obtained by the preparation process using an electrochemical workstation of the type Zahner Im6ex, Germany. Wherein the single-electrode mass load of the active self-supporting electrode used in the target product is 3.4mg/cm2The mass load of the half electrode (the outermost active self-supporting electrode) is 1.7mg/cm2。
Graph a in FIG. 1 is a cyclic voltammogram of the desired product at a scan rate of 2-100mV/s, and it can be seen from graph a that the desired product has good capacitance performance even at a high scan rate of 100 mV/s;
b is the load of the active self-supporting electrode in the target product is 54.4mg/cm2(Mass Loading of Positive electrode active Material or negative electrode active Material) was measured, and it was found that the objective product obtained 10.9F/cm2The ultra-high surface capacitance;
c is a constant current charge and discharge curve chart of the target product, which is at 0.1A/cm2Has a voltage drop of only 0.05V at high current densities;
the Nyquist plot of the target product is shown in d, and it is understood that the equivalent series resistance of the target product is only 0.07 Ω.
Detailed Description
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
First commercially available or manufactured on its own:
the self-supporting electrode comprises an MXene titanium carbide film, an MXene carbon nanotube composite film and an MXene graphene composite film which are used as active self-supporting electrodes, wherein the conductivity of the active self-supporting electrodes is more than or equal to 2000S/cm;
polyvinyl alcohol-sulfuric acid gel electrolyte, polyvinyl alcohol-phosphoric acid gel electrolyte and polyvinyl alcohol-potassium hydroxide gel electrolyte as gel electrolytes.
Then:
example 1
The preparation method comprises the following specific steps:
step 1, coating gel electrolyte with the thickness of 20 microns on the upper surface of an active self-supporting electrode; wherein the active self-supporting electrode is MXene titanium carbide film, and the gel electrolyte is polyvinyl alcohol-sulfuric acid gel electrolyte. And placing the active self-supporting electrode under the vacuum degree of-0.08 Mpa for 3min to obtain an active self-supporting electrode with the upper surface soaked with the gel electrolyte.
And 2, firstly, attaching the other active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, and then coating the gel electrolyte with the thickness of 20 microns on the surface of the active self-supporting electrode. And placing the electrode under vacuum degree of-0.08 Mpa for 3min to obtain multiple layers of active self-supporting electrodes with gel electrolyte soaked on the upper surfaces.
Step 3, firstly, attaching another active self-supporting electrode to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, to obtain an intermediate product; wherein the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer. And then the active self-supporting electrodes at the two ends of the intermediate product are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal, and then the active self-supporting electrodes are packaged in a packaging shell to obtain the solid laminated interdigital electrochemical capacitor similar to the curve shown in figure 1.
Example 2
The preparation method comprises the following specific steps:
step 1, firstly coating a gel electrolyte with the thickness of 25 microns on the upper surface of an active self-supporting electrode; wherein the active self-supporting electrode is MXene titanium carbide film, and the gel electrolyte is polyvinyl alcohol-sulfuric acid gel electrolyte. And placing the active self-supporting electrode under the vacuum degree of-0.09 Mpa for 2.5min to obtain an active self-supporting electrode with the gel electrolyte soaked on the upper surface.
And 2, firstly, attaching the other active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, and then coating the gel electrolyte with the thickness of 25 microns on the surface of the active self-supporting electrode. And placing the multilayer active self-supporting electrode under the vacuum degree of-0.09 Mpa for 2.5min to obtain the multilayer active self-supporting electrode with the gel electrolyte soaked on the upper surface.
Step 3, repeating the process of the step 2 for 8 times, and then attaching another active self-supporting electrode to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, to obtain an intermediate product; wherein the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer. And then the active self-supporting electrodes at the two ends of the intermediate product are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal, and then the active self-supporting electrodes are packaged in a packaging shell to obtain the solid laminated interdigital electrochemical capacitor similar to the curve shown in figure 1.
Example 3
The preparation method comprises the following specific steps:
step 1, firstly, coating a gel electrolyte with the thickness of 30 mu m on the upper surface of an active self-supporting electrode; wherein the active self-supporting electrode is MXene titanium carbide film, and the gel electrolyte is polyvinyl alcohol-sulfuric acid gel electrolyte. And placing the active self-supporting electrode under the vacuum degree of-0.1 Mpa for 2min to obtain an active self-supporting electrode with the gel electrolyte soaked on the upper surface.
And 2, firstly, attaching the other active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, and then coating the gel electrolyte with the thickness of 30 microns on the surface of the active self-supporting electrode. And placing the multilayer active self-supporting electrode under the vacuum degree of-0.1 Mpa for 2min to obtain the multilayer active self-supporting electrode with the gel electrolyte soaked on the upper surface.
Step 3, repeating the process of the step 2 for 15 times, and then attaching another active self-supporting electrode to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, to obtain an intermediate product; wherein the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer. And then the active self-supporting electrodes at the two ends of the intermediate product are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal, and then the active self-supporting electrodes are packaged in a packaging shell to obtain the solid laminated interdigital electrochemical capacitor similar to the curve shown in figure 1.
Example 4
The preparation method comprises the following specific steps:
step 1, firstly coating gel electrolyte with the thickness of 35 mu m on the upper surface of an active self-supporting electrode; wherein the active self-supporting electrode is MXene titanium carbide film, and the gel electrolyte is polyvinyl alcohol-sulfuric acid gel electrolyte. And placing the active self-supporting electrode under the vacuum degree of-0.11 Mpa for 1.5min to obtain the active self-supporting electrode with the gel electrolyte soaked on the upper surface.
And 2, firstly, attaching the other active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, and then coating the gel electrolyte with the thickness of 35 microns on the surface of the active self-supporting electrode. And placing the multilayer active self-supporting electrode under the vacuum degree of-0.11 Mpa for 1.5min to obtain the multilayer active self-supporting electrode with the gel electrolyte soaked on the upper surface.
Step 3, repeating the process of the step 2 for 23 times, and then attaching another active self-supporting electrode to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, to obtain an intermediate product; wherein the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer. And then the active self-supporting electrodes at the two ends of the intermediate product are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal, and then the active self-supporting electrodes are packaged in a packaging shell to obtain the solid laminated interdigital electrochemical capacitor similar to the curve shown in figure 1.
Example 5
The preparation method comprises the following specific steps:
step 1, firstly coating gel electrolyte with the thickness of 40 mu m on the upper surface of an active self-supporting electrode; wherein the active self-supporting electrode is MXene titanium carbide film, and the gel electrolyte is polyvinyl alcohol-sulfuric acid gel electrolyte. And placing the active self-supporting electrode under the vacuum degree of-0.12 Mpa for 1min to obtain an active self-supporting electrode with the gel electrolyte soaked on the upper surface.
And 2, firstly, attaching the other active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, and then coating the gel electrolyte with the thickness of 40 microns on the surface of the active self-supporting electrode. And placing the multilayer active self-supporting electrode under the vacuum degree of-0.12 Mpa for 1min to obtain the multilayer active self-supporting electrode with the gel electrolyte soaked on the upper surface.
Step 3, repeating the process of the step 2 for 30 times, and then attaching another active self-supporting electrode to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, to obtain an intermediate product; wherein the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the inner layer. And then, after the active self-supporting electrodes at two ends of the intermediate product are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal, the active self-supporting electrodes are packaged in a packaging shell to obtain the solid laminated interdigital electrochemical capacitor shown by the curve in figure 1.
Then MXene titanium carbide film or MXene carbon nanotube composite film or MXene graphene composite film as active self-supporting electrode, and polyvinyl alcohol-sulfuric acid gel electrolyte or polyvinyl alcohol-phosphoric acid gel electrolyte or polyvinyl alcohol-potassium hydroxide gel electrolyte as gel electrolyte are respectively selected, and the above-mentioned examples 1-5 are repeated, so that the solid-state laminated interdigital electrochemical capacitor shown by the curve in figure 1 or similar can be obtained.
It will be apparent to those skilled in the art that various modifications and variations can be made in the solid state stacked interdigitated electrochemical capacitor of the present invention and its method of fabrication without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims (5)

1. A solid-state laminated interdigital electrochemical capacitor is composed of an active self-supporting electrode, an electrolyte layer and an electrode leading-out terminal, and is characterized in that:
the active self-supporting electrode and the electrolyte layer are alternately superposed;
two adjacent active self-supporting electrodes alternately superposed with the electrolyte layer are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal in a back-to-back manner;
the active self-supporting electrode is an MXene titanium carbide film, an MXene carbon nanotube composite film or an MXene graphene composite film;
the electrolyte layer is a gel electrolyte;
the preparation method of the solid-state laminated interdigital electrochemical capacitor mainly comprises the following steps:
step 1, firstly coating gel electrolyte with the thickness of 20-40 mu m on the upper surface of the active self-supporting electrode, and then placing the active self-supporting electrode in vacuum for at least 1min to obtain the active self-supporting electrode with the gel electrolyte soaked on the upper surface;
step 2, firstly, attaching another active self-supporting electrode to the surface of the active self-supporting electrode soaked with the gel electrolyte, coating the gel electrolyte with the thickness of 20-40 mu m on the surface of the active self-supporting electrode, and then placing the active self-supporting electrode in vacuum for at least 1min to obtain a plurality of layers of active self-supporting electrodes with the surfaces soaked with the gel electrolyte;
step 3, after the process of the step 2 is repeated for more than zero times, another active self-supporting electrode is attached to one surface of the multilayer active self-supporting electrode, which is soaked with the gel electrolyte, so as to obtain an intermediate product, and then the active self-supporting electrodes at two ends of the intermediate product are respectively and electrically connected with the positive electrode lead-out terminal and the negative electrode lead-out terminal, so that the solid laminated interdigital electrochemical capacitor is prepared;
the conductivity of the active self-supporting electrode is more than or equal to 2000S/cm, and the mass load per unit area and the thickness of the active self-supporting electrode at the outermost layer are half of those of the active self-supporting electrode at the inner layer.
2. The solid state stacked interdigitated electrochemical capacitor of claim 1 wherein said solid state stacked interdigitated electrochemical capacitor is externally encased by an encapsulating jacket.
3. The solid state stacked interdigitated electrochemical capacitor of claim 2 wherein the number of active self-supporting electrodes in the alternating stack of active self-supporting electrodes and electrolyte layers is 3 or more.
4. The solid state stacked interdigitated electrochemical capacitor of claim 3 wherein said gel electrolyte is a polyvinyl alcohol-sulfuric acid gel electrolyte, or a polyvinyl alcohol-phosphoric acid gel electrolyte, or a polyvinyl alcohol-potassium hydroxide gel electrolyte.
5. The solid state stacked interdigitated electrochemical capacitor of claim 1 wherein the vacuum in step 1 is less than-0.08 Mpa.
CN201911068720.0A 2019-11-05 2019-11-05 Solid laminated interdigital electrochemical capacitor and preparation method thereof Active CN110828197B (en)

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