WO2013000263A1

WO2013000263A1 - Super polyimide capacitor and preparation method thereof

Info

Publication number: WO2013000263A1
Application number: PCT/CN2011/085102
Authority: WO
Inventors: 吕晓义; 李晓燕; 王�琦; 桑玉贵; 匡晓明; 任金生
Original assignee: 深圳市惠程电气股份有限公司
Priority date: 2011-06-30
Filing date: 2011-12-31
Publication date: 2013-01-03
Also published as: CN102306549A

Abstract

The present invention relates to a super polyimide capacitor. The super polyimide capacitor of the present invention comprises a capacitor housing, an electrolyte solution and a power-core; the power-core is encapsulated in the capacitor housing by sequentially winding or stacking a polyimide diaphragm, a positive plate, another polyimide diaphragm and a negative plate; the positive plate and the negative plate are formed by attaching positive and negative slurries to a current collector; the positive plate and the negative plate are respectively connected to a guide pin threading out of the capacitor housing; the positive and negative slurries comprise the following components by weight percent: 15%-45% of a porous carbon material, 0.5%-10% of a conductive agent, 1%-15% of an adhesive agent and 30%-70% of a solvent. The super polyimide capacitor of the present invention has an energy density of more than 5.6 wh/kg and a power density of more than 6,500 w/kg, with good electrochemical and thermal stability, has wide operational temperature range, and can be used in the fields of electric tools, hybrid power automobiles and solar energy storage and the like.

Description

Polyimide supercapacitor and preparation method thereof

Technical field

The present invention relates to the field of capacitors, and in particular to a polyimide supercapacitor.

Background technique

Supercapacitor is a new type of electrochemical energy storage device between traditional capacitors and batteries. It has higher energy density than traditional capacitors, and its electrostatic capacity can reach tens of thousands of terahertz; it is higher than battery. Its power density and long cycle life make it a combination of traditional capacitors and batteries. It is a promising chemical power source. It has the characteristics of high specific capacity, high power, long life, wide working temperature limit and maintenance-free.

According to the principle of energy storage, supercapacitors can be divided into three categories: electric double layer capacitors (EDLC), Faraday quasi-capacitor supercapacitors and hybrid supercapacitors, in which electric double layer capacitors are mainly formed by electrode Z electrolyte interface charge separation. The electric double layer is used to realize the storage of charge and energy; the Faraday quasi-capacitor supercapacitor mainly realizes the storage of charge and energy by means of the Faraday "quasi-capacitance" generated by the rapid redox reaction on the electrode surface; and the hybrid supercapacitor is a The non-polarized electrode of the battery (such as nickel hydroxide) and the polarized electrode of the electric double layer capacitor (such as activated carbon) are used on the other pole. This hybrid design can greatly increase the energy density of the supercapacitor.

Supercapacitors can be divided into three kinds of supercapacitors: inorganic electrolyte, organic electrolyte and polymer electrolyte. The inorganic electrolytes are mostly used in high concentration of acidic (such as H ₂ S0 ₄ ) or alkaline (such as KOH) aqueous solutions. Neutral aqueous electrolytes are less used; organic electrolytes generally use a quaternary ammonium salt or a lithium salt and a high-conductivity organic solvent (such as acetonitrile) to form a mixed electrolyte, while polymer electrolytes are now only in the laboratory stage, still No commercial products emerged. Instruction manual

In the patent application number 200510110461.5, LiMn ₂ _ _x M _x 0 _{4 is} used for the positive electrode and activated carbon is used for the negative electrode, and the specific energy of the supercapacitor is up to 50 Wh/Kg (calculated based on the total mass of the positive and negative active materials). However, the energy density and power density of such organic hybrid supercapacitors are not ideal, the electrochemical stability is poor, the thermal stability is poor, and the operating temperature range is small, and the cycle life of the capacitor battery is short, which cannot meet the requirements for capacitor batteries.

Summary of the invention

In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a polyimide supercapacitor which adopts a porous carbon material to prepare a large capacity, high power, long cycle life, no pollution, high safety, and maintenance-free super. Capacitor.

Another object of the present invention is to provide a method of preparing a polyimide supercapacitor in conjunction with the polyimide supercapacitor of the present invention.

In order to achieve the above object, the technical solution adopted by the present invention is as follows:

A polyimide supercapacitor comprising a container casing, an electrolyte and a battery core, wherein the battery core is sequentially wound or stacked in the order of a polyimide separator, a positive electrode sheet, a polyimide separator, and a negative electrode sheet. The positive electrode sheet and the negative electrode sheet are made by attaching the positive and negative electrode pastes to the current collector, and the positive and negative electrode sheets are respectively connected to the guide pins, and the guide pins are pierced from the container casing, the positive and negative electrodes. The slurry consists of the following components in terms of mass percentage: porous carbon material 15% - 45%, conductive agent 0.5% - 10%, adhesive 1% - 15%, solvent 30% - 70%.

The positive and negative electrode pastes have a viscosity in the range of 1500 cps to 8500 cps, a solid content ranging from 20% to 60%, and a pH of 6-10.

The porous material is porous carbon material acetylene black, activated carbon, conductive carbon black, natural graphite, artificial graphite, activated carbon fiber, carbon cloth, carbon nanotube, hard carbon, carbon aerogel, one or two of graphite crucible Description

More than one kind of mixture.

The conductive agent used in the present invention is one or a mixture of two or more kinds of conductive carbon black, conductive graphite, SP-Li, Ketjen black, and carbon nanotubes.

The polyimide separator of the present invention has a thickness of 5 to 70 μm, preferably 20 to 40 μm; and has a porosity of 50 to 95%, preferably 90 to 95%.

The solvent may be deionized water or an organic solution, and is selected according to the compatibility of the above components. The electrolyte is an organic electrolyte, wherein the electrolyte is lithium tetrafluoroborate, tetraethylammonium tetrafluoroborate, tetradecyltetrafluoroborate, tetrapropyltetrafluoroborate, tetrabutyltetrafluoroborate , trimethylethyltetrafluoroborate, diethyl dimethyltetrafluoroborate, N-ethyl-N-decylpyrrolidine tetrafluoroborate, lithium hexafluorophosphate, tetraethyl hexafluorophosphate, tetraterpene Hexafluorophosphoric acid amine, tetrapropyl hexafluorophosphoric acid amine, tetrabutyl hexafluorophosphoric acid amine, tridecyl ethyl hexafluorophosphate, triethyl decyl hexafluorophosphate, diethyl dimercapto hexafluorophosphate One or more of the amine phosphates are optionally combined; wherein the organic solvent is ethylene carbonate, propylene carbonate, γ-butyrolactone, dinonyl carbonate, diethyl carbonate, butylene carbonate, ethyl methyl carbonate, One or a mixture of isopropyl carbonate, vinyl sulfite, propylene sulfite, ethyl acetate, and acetonitrile is mixed, and the concentration of the electrolyte is 0.3 mol/L to 4 mol/L.

A method for preparing a polyimide supercapacitor, comprising the steps of:

(1) Preparation of the pole piece: The porous carbon material, the conductive agent, the adhesive, and the solvent are uniformly mixed in proportion, and the electrode slurry having a viscosity of 1500 cps-8500 cps is prepared, coated on the collector fluid, and dried. , rolling, slitting, and tableting to obtain positive and negative electrode sheets;

(2) Preparation of the battery core: The positive and negative electrode sheets are prepared into a battery core by a polyimide diaphragm in a winding or superimposing manner, and the polyimide diaphragm is insulated to separate the pole pieces;

(3) Liquid-filled package: The positive and negative electrodes in the battery are inserted into the shell, and the guide pins are respectively connected, the guide pins are pierced from the container casing, and then the electrolyte is injected and sealed to obtain a polyimide supercapacitor. Instruction manual

The current collector described in the present invention is one of a stainless steel foil, a stainless steel mesh, an aluminum foil, an aluminum mesh, a nickel foil, and a foamed nickel.

The polyimide supercapacitor of the present invention can be made into a capacitor packaged in an aluminum casing or a capacitor in a flexible film package.

Compared with the prior art, the beneficial effects of the invention are as follows: The polyimide supercapacitor prepared by the invention has an energy density of >5.6 11/13⁄4, a power density of >650 (^/13⁄4, and the heat resistance is greatly improved, and the cycle The polyimide supercapacitor of the invention has good electrochemical stability and thermal stability, and has a wide temperature range, and can be applied to electric vehicles, electric tools, hybrid vehicles, solar energy storage and the like.

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

DRAWINGS

1 is a schematic view of a polyimide supercapacitor mechanism of the present invention. detailed description

As shown in FIG. 1, the polyimide supercapacitor of the present invention comprises a container case 1, an electrolyte and an electric cell, and the cell is in accordance with a polyimide separator 5, a positive electrode sheet 2, and a polyimide separator 4. The negative electrode sheets 3 are sequentially wound or stacked and packaged in the container casing 1, wherein the positive electrode sheets 2 and the negative electrode sheets 3 are formed by attaching positive and negative electrode pastes to the current collector, and the positive and negative electrode sheets are respectively connected to the guide pins. 6 and the guide pin 7, the guide pin 6 and the guide pin 7 are pierced from the container casing, and the positive and negative electrode slurries are composed of the following components in terms of mass percentage: porous carbon material 15% - 45%, conductive agent 0.5 %-10%, adhesive 1%-15%, solvent 30%-70%.

A method for preparing a polyamidene supercapacitor, comprising the steps of:

(1) Preparation of the pole piece: The porous carbon material, the conductive agent, the adhesive, and the solvent are uniformly mixed in proportion. Instruction manual

After preparing a 1500 cps-8500 cps electrode slurry having a viscosity, coating on a collector fluid, drying, rolling, slitting, and tableting to obtain positive and negative electrode sheets;

(3) Liquid-filled package: The positive and negative electrodes in the battery are inserted into the shell, and the guide pins are respectively connected, the guide pins are pierced from the container casing, and then the electrolyte is injected and sealed to obtain a polyimide supercapacitor.

Example 1:

(1) Production of pole piece: Mixing activated carbon, conductive carbon black, adhesive and deionized water with a total mass of 1000g in a ratio of 45:10:15:30 by mass, and adjusting it in a vacuum mixer. The slurry has a viscosity of 8500 cps, and the slurry is uniformly coated on an aluminum foil, and then dried at 90-100 ° C, dried, rolled, cooled, and cut, and the positive electrode is cut to a length of 98 mm. 12.5mm wide, the negative pole is cut to 115mm long, 12.5mm wide, and its areal density is 90m ² /g

(2) Preparation of the battery cell: A polyimide film having a thickness of 20 μm is used, and the film is stacked and wound in the order of the polyimide film, the positive electrode sheet, the polyimide film, and the negative electrode sheet.

(3) Injecting liquid package: The above-mentioned electric cell is placed in an aluminum container case having a diameter of 10 mm and a height of 20 mm, and an electrolyte is injected therein. The solute in the electrolyte is tetraethylammonium tetrafluoroborate, the solvent is acetonitrile, and electrolysis The concentration of the liquid is 0.3 mol/L, and after sealing, it is formed in a conventional manner to obtain an aluminum package polyimide super capacitor crying.

Supercapacitor performance test: After performance, the performance is tested, 150mA is charged to 2.7V, and then discharged to 0.1V with a constant current of 150mA, cycled 10 times, the discharge capacity obtained after 10 times is 3.3F, and the specific energy is 2.0wh/kg. The specific power is 4600w/kg. The capacitor is placed in a high-temperature impact box, heated to 185 ° C at 5 ° C / min, and thermostated for 2 hours, the appearance of the product does not change, the capacity and ESR value change does not exceed 5%, indicating that the product has good high temperature resistance performance. After the capacitor is discharged through the 150mA charge and discharge cycle for 10,000 times, it is placed Description

The capacitance dropped by 8%.

Example 2:

(1) Production of pole pieces: Mixing activated carbon, conductive carbon black, conductive agent and deionized water with a total mass of 1000 g in a mass ratio of 15:10:15:60, and adjusting to a uniformity in a vacuum mixer The viscosity of the slurry and the slurry was 1500 cps, and the slurry was uniformly coated on an aluminum foil, and then dried, rolled, cooled, and cut at 90-100 ° C, and the positive electrode was cut to 190 mm long, 17.5. The mm is wide, and the negative electrode is cut to a length of 210 mm and a width of 17.5 mm, and its areal density is 92 m ² /g.

(2) Preparation of the battery core: A polyimide separator having a thickness of 25 μm is used, and the positive electrode sheet, the polyimide separator, and the negative electrode sheet are sequentially stacked and wound into a roll in the order of the polyimide separator.

(3) Liquid-filled package: The above-mentioned battery core is placed in an aluminum container case with a diameter of 12.5 mm and a height of 25 mm, and an electrolyte is injected therein. The solute in the electrolyte is tetraethylammonium tetrafluoroborate, the solvent is acetonitrile, and electrolysis The concentration of the liquid is 2mol/L, and after sealing, it is formed in a conventional manner, and the aluminum package polyimide super capacitor is obtained.

Supercapacitor performance test: After performance, the performance is tested. 500mA is charged to 2.7V, and then discharged to 0.1V with a constant current of 500mA. The cycle is 10 times. After 10 times, the discharge capacity is 10.0F and the specific energy is 2.4wh/kg. The specific power is 6000w/kg. The capacitor is placed in a high-temperature impact box, heated to 185 ° C at 5 ° C / min, and thermostated for 2 hours, the appearance of the product does not change, the capacity and ESR value changes not more than 3%, indicating that the product has good resistance High temperature performance. After discharging the capacitor for 10,000 cycles, the discharge capacity of the capacitor dropped by 7%.

Example 3:

(1) Production of pole pieces: Mixing activated carbon, conductive graphite, adhesive and deionized water with a total shield of 1000% in a mass ratio of 30: 5: 10: 55, and adjusting them in a vacuum mixer. The slurry, the viscosity of the slurry is 5500 cps, the slurry is uniformly coated on the aluminum foil, and then dried at 90-100 ° C, Instruction manual

After rolling and cooling, the positive electrode is cut to 625 mm long and 44 mm wide, and the negative electrode is cut to be 660 mm long and 44 mm wide, and the areal density is 100 m ² /g.

(2) Preparation of the battery cell: A polyimide separator having a thickness of 35 μm was used, and the polyimide separator, the positive electrode sheet, the polyimide separator, and the negative electrode sheet were sequentially stacked and wound into a roll.

(3) Injection molding: The above-mentioned battery cells are placed in an aluminum container case having a diameter of 22 mm and a height of 56 mm, and an electrolyte is injected therein. The solute in the electrolyte is tetraethylammonium tetrafluoroborate, and the solvent is acetonitrile. The concentration of the liquid was 4 mol/L, and after sealing, it was formed in a conventional manner to obtain a polyimide supercapacitor.

Performance test of supercapacitor: After performance, the performance is tested, 5000mA is charged to 2.7V, and then discharged to 0.1V with a constant current of 5000mA, cycle 10 times, the discharge capacity obtained after 10 times is 100F, and the specific energy is 3.9wh/kg. The power is 6108w/kg. The capacitor is placed in a high-temperature impact box, heated to 185 ° C at 5 ° C / min, and thermostated for 2 hours, the appearance of the product does not change, the capacity and ESR value change does not exceed 5%, indicating that the product has good high temperature resistance performance. After the capacitor was discharged through 5000 mA for 10,000 cycles, its discharge capacity decreased by 8.5%.

Example 4:

(1) Production of pole pieces: Mixing activated carbon, Ketjen black, adhesive, and deionized with a total mass of 2000g in a ratio of 15:5:10:70 by mass ratio, and adjusting to a uniformity in a vacuum mixer. The slurry, the viscosity of the slurry was 1500 cps, the slurry was uniformly coated on an aluminum foil, and then dried, rolled, cooled, and cut at 90-100 ° C, and the positive electrode was cut to 1700 mm long and 48 mm wide. The negative electrode was cut to a length of 1750 mm and a width of 48 mm, and its areal density was 90 m ² /g.

(2) Preparation of the battery cell: A polyimide separator having a thickness of 35 μm is used, and the positive electrode sheet, the polyimide separator, and the negative electrode sheet are sequentially stacked and wound into a roll in the order of the polyimide separator.

(3) Liquid-filled package: The above-mentioned battery core is placed in an aluminum container case having a diameter of 35 mm and a height of 61 mm, and an electrolyte is injected therein. The electrolyte shield is tetraethylammonium tetrafluoroborate, and the solvent is acetonitrile. Electricity Description

The concentration of the solution was 3 mol/L, and after sealing, it was formed in a conventional manner to obtain an aluminum-packaged polyimide supercapacitor.

Supercapacitor performance test: After performance, the performance is tested. 20A is charged to 2.7V, and then discharged to 0.1V with a constant current of 20A. The cycle is 10 times. After 10 times, the discharge capacity is 350F and the specific energy is 3.45 wh/kg. The power is 5600w/kg. The capacitor is placed in a high-temperature impact box, heated to 185 ° C at 5 ° C / min, and thermostated for 2 hours, the appearance of the product does not change, its capacity and ESR value does not change more than 5%, indicating that the product has good high temperature resistance performance. After the capacitor has been charged and discharged for 20 times through 20A, its discharge capacity does not decrease by more than 8%.

Example 5

(1) Production of pole pieces: Mixing activated carbon, Ketjen black, adhesive and deionized water with a total mass of 2000 g in a ratio of 45:5:10:40 by mass, and adjusting them in a vacuum mixer. The slurry, the viscosity of the slurry is 7500 cps, the slurry is applied to the aluminum foil, and then dried at 90-100 ° C, crushed, cooled and cut, and the positive electrode is cut into 100*154 *0.130mm, the negative electrode is cut to 100*154*0.0130mm, and its areal density is 90m ² /g.

(2) Preparation of the battery cell: A polyimide separator with a thickness of 35 μm is used, and 18 positive electrodes and polyimide separators are sequentially stacked in the order of a polyimide separator, a positive electrode sheet, a polyimide separator, and a negative electrode sheet. 19 negative electrodes.

(3) Injection molding: The above-mentioned battery cells are placed in an aluminum plastic film container casing, and an electrolyte is injected therein. The solute in the electrolyte is tetraethylammonium tetrafluoroborate, the solvent is acetonitrile, and the concentration of the electrolyte is 3 mol. /L, after sealing, it is formed in a conventional manner to obtain a plastic film flexible package polyimide supercapacitor.

Supercapacitor performance test: After performance, the performance is tested. 60A is charged to 2.7V, and then discharged to 0.1V with a constant current of 60A. The cycle is 10 times. After 10 times, the discharge capacity is 1200F and the specific energy is 5.2wh/kg. The power is 5800w/kg. The capacitor is placed in a high temperature impact box and heated to 5 ° C / min to Description

At 185 ° C, and the temperature is 2 hours, the appearance of the product does not change, and the change in capacity and ESR value does not exceed 5%, indicating that the product has good high temperature resistance. After the capacitor is discharged through the 60A charge and discharge cycle for 10,000 times, its discharge capacity does not decrease by more than 10%.

Example 6:

(1) Preparation of pole pieces: Mixing activated carbon, conductive graphite, PVDF, NMP (N-methylpyrrolidone) with a total mass of 2000g, in a mass ratio of 15:10:15:60, in a vacuum mixer The slurry was adjusted to a homogenous hook, and the viscosity of the slurry was 2000 cps. The slurry was uniformly coated on an aluminum foil, then dried at 130-140 ° C, crushed, cooled, and cut. The positive electrode was cut to 1700 mm long and 48 mm wide, and the negative electrode was cut to 1750 mm long and 48 mm wide, and its areal density was 90 m ² /g.

(3) Injection molding: The above-mentioned battery cells are placed in an aluminum container case having a diameter of 35 mm and a height of 61 mm, and an electrolyte is injected therein. The solute in the electrolyte is tetraethylammonium tetrafluoroborate, and the solvent is acetonitrile. The concentration of the liquid was 3 mol/L, and after sealing, it was formed in a conventional manner to obtain an aluminum-packaged polyimide supercapacitor.

Supercapacitor performance test: After performance, the performance is tested. 20A is charged to 2.7V, and then discharged to 0.1V with a constant current of 20A. The cycle is 10 times. After 10 times, the discharge capacity is 400F and the specific energy is 3.75 wh/kg. The power is 6600w/kg. The capacitor is placed in a high-temperature impact box, heated to 185 ° C at 5 ° C / min, and thermostated for 2 hours, the appearance of the product does not change, its capacity and ESR value does not change more than 5%, indicating that the product has good high temperature resistance performance. After the capacitor was charged and discharged for 20 times through 20A, its discharge capacity decreased by 8%.

Example 7

(1) Production of pole pieces: a total mass of 2000g of activated carbon, carbon nanotubes, adhesive PVDF, Instruction manual

NMP was mixed at a mass ratio of 45:5:10:40, and a uniform slurry was adjusted in a vacuum mixer to have a slurry viscosity of 8500 cps. The slurry was uniformly coated on an aluminum foil, and then dried, rolled, and cut at 130-140 °C. The positive electrode is cut to 100* 154*0.130mm, and the negative electrode is cut to 100* 154*0.0130mm, and its areal density is 90m ² /g.

(2) Preparation of the battery cell: A polyimide separator with a thickness of 35 μm is used, and 18 positive electrodes and a polyimide film are laminated in this order according to the polyimide separator, the positive electrode sheet, the polyimide separator and the negative electrode sheet. 19 negative electrodes.

Supercapacitor performance test: After performance, the performance is tested. 60A is charged to 2.7V, and then discharged to 0.1V with 60A constant current. The cycle is 10 times. After 10 times, the discharge capacity is 1300F and the specific energy is 5.6wh/kg. The power is 6500w/kg. The capacitor is placed in a high-temperature impact box, heated to 185 ° C at 5 ° C / min, and thermostated for 2 hours, the appearance of the product does not change, its capacity and ESR value does not change more than 5%, indicating that the product has good high temperature resistance performance. After the capacitor was charged and discharged for 60 times through 60A, its discharge capacity decreased by 8%.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention belong to the present invention. protected range.

Claims

Claim

A polyimide supercapacitor comprising a container casing, an electrolyte and an electric cell, characterized in that: the cell is in the order of a polyimide film, a positive electrode sheet, a polyimide film, and a negative electrode sheet. The film is sequentially wound or stacked in a container casing, wherein the positive electrode and the negative electrode plate are made by attaching the positive and negative electrode pastes to the current collector, and the positive and negative electrode sheets are respectively connected to the guide pins, and the guide pins are pierced from the container casing. The positive and negative electrode slurry is composed of the following components in terms of mass percentage: porous carbon material 15%-45%, conductive agent 0.5%-10%, adhesive 1%-15%, solvent 30%-70 %„

2. The polyimine supercapacitor according to claim 1, wherein: the positive and negative slurry have a viscosity in the range of 1500 cps to 8500 cps, a solid content ranging from 20% to 60%, and a pH of 6-10. .

3. The polyimide supercapacitor according to claim 1, wherein the porous material is porous carbon material acetylene black, activated carbon, conductive carbon black, natural graphite, artificial graphite, activated carbon fiber, carbon cloth, carbon One or a mixture of two or more of nanotubes, hard carbon, carbon aerogel, and graphene.

The polyimide supercapacitor according to claim 1, wherein the conductive agent is one or a mixture of two or more of conductive carbon black, conductive graphite, ketjen black, and carbon nanotube.

The polyimide supercapacitor according to claim 1, wherein the polyimide separator has a thickness of 5 to 70 μm and a porosity of 50 to 95%.

6. The polyimide supercapacitor according to claim 1, wherein: the electrolyte is an organic electrolyte, wherein the electrolyte is lithium tetrafluoroborate, tetraethylammonium tetrafluoroborate, tetrakis(tetrafluoro)tetrafluoro Boric acid amine, tetrapropyltetrafluoroborate amine, tetrabutyltetrafluoroborate amine, tridecylethyltetrafluoroborate, diethyldithiotetrafluoroborate, Ν-ethyl-Ν-methylpyrrole Alkyl tetrafluoroborate, lithium hexafluorophosphate, tetraethyl hexafluorophosphate, tetramethyl hexafluorophosphate, tetrapropyl hexafluorophosphate, tetrabutyl hexafluorophosphate, tridecylethyl hexafluorophosphate, One or more of triethylsulfonyl hexafluorophosphate and diethyldimercapto hexafluorophosphate; wherein the solvent is ethylene carbonate, propylene carbonate, γ-butyrolactone, diterpene carbonate Ester, diethyl carbonate, butylene carbonate, ethyl cerium carbonate, propyl propyl carbonate, vinyl sulfite, Claim

One or more of acrylic acid acrylate, ethyl acetate, and acetonitrile, and the concentration of the electrolyte is

7. The method of preparing a polyimide supercapacitor according to claim 1, characterized in that it comprises the following steps:

(1) Preparation of the pole piece: The porous carbon material, the conductive agent, the adhesive, and the solvent are uniformly mixed in proportion, and the electrode slurry having a viscosity of 1500 cps to 8500 cps is prepared, coated on the current collector, and dried. Rolling, slitting, and tableting to obtain positive and negative electrode sheets;

(3) Liquid-filled package: The positive and negative electrodes in the battery are inserted into the shell, and the guide pins are respectively connected, the guide pins are pierced from the container casing, and then the organic electrolyte is injected and sealed to obtain a polyimide supercapacitor.

The method of preparing a polyimide supercapacitor according to claim 7, wherein the current collector is one of a stainless steel foil, a stainless steel mesh, an aluminum foil, an aluminum mesh, a nickel foil, and a foamed nickel.

9. The method of preparing a polyimide supercapacitor according to claim 7, wherein the polyimide supercapacitor is an aluminum packaging capacitor or a plastic film flexible packaging capacitor.