CN117747316A - Preparation method of dry electrode for super capacitor - Google Patents
Preparation method of dry electrode for super capacitor Download PDFInfo
- Publication number
- CN117747316A CN117747316A CN202311647915.7A CN202311647915A CN117747316A CN 117747316 A CN117747316 A CN 117747316A CN 202311647915 A CN202311647915 A CN 202311647915A CN 117747316 A CN117747316 A CN 117747316A
- Authority
- CN
- China
- Prior art keywords
- temperature
- carbon film
- dry electrode
- materials
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000003990 capacitor Substances 0.000 title claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 109
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 14
- 239000000853 adhesive Substances 0.000 claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011888 foil Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 87
- 239000000428 dust Substances 0.000 claims description 8
- 238000010902 jet-milling Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims 1
- 239000012258 stirred mixture Substances 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 239000011149 active material Substances 0.000 abstract description 6
- 238000001125 extrusion Methods 0.000 abstract description 5
- 239000002904 solvent Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 17
- 238000003475 lamination Methods 0.000 description 8
- 238000000576 coating method Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 239000012257 stirred material Substances 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000000498 ball milling Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 238000000935 solvent evaporation Methods 0.000 description 3
- 235000013162 Cocos nucifera Nutrition 0.000 description 2
- 244000060011 Cocos nucifera Species 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 239000006230 acetylene black Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 206010061592 cardiac fibrillation Diseases 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002600 fibrillogenic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003273 ketjen black Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The invention relates to a preparation method of a dry electrode, in particular to a preparation method of a dry electrode of a supercapacitor. The technical scheme adopted by the invention is as follows: the method comprises the following steps: baking the raw materials for removing water, stirring, and mixing and stirring with binder powder according to a certain proportion; heating and then crushing by air flow, wherein the heating and the air flow crushing are carried out at least twice; then heating and then adding the mixture into a roller press for tabletting to prepare a self-supporting carbon film; then rolling for the second time to reduce the thickness of the carbon film; the carbon film and the conductive aluminum foil are pressed together according to the structure of carbon film-aluminum foil-carbon film to prepare the electrode. The invention utilizes the unique property of polytetrafluoroethylene that is easy to fibrillate, fibrillates the adhesive by means of extrusion or high-speed airflow impact, distributes the fibrillated adhesive on the surface of the active particles and crosslinks to form a network, and the problems of low bonding strength between the active material and the current collector, cracks on the pole piece, layering, poor flexibility and the like can be effectively solved. The electrode production process has no solvent introduction, and can reduce about 18% of working hours and 20% of energy consumption after using a dry method.
Description
Field of technology
The invention relates to a preparation method of a dry electrode, in particular to a preparation method of a dry electrode of a supercapacitor.
Background
The super capacitor is a novel energy storage device, and the principle is based on porous carbon, conductive polymer and other materials, and the super capacitor is used for realizing the storage and release of energy by rapidly charging and discharging at an electrode surface-electrolyte interface. The super capacitor mainly comprises an electrode, a diaphragm, a shell and electrolyte solution filled in the device, wherein the electrode is a core component of the super capacitor and plays a decisive role in the performance of the super capacitor.
At present, the mainstream batch production process of the supercapacitor electrode is still a wet process, and the process has the advantages of low production difficulty, high efficiency and mature production equipment, but has the following defects:
1. the production period is long, the electrode manufacturing mainly comprises the processes of slurry mixing, coating, drying, calendaring, slitting, vacuum drying (the drying process takes more than 80 percent of the electrode manufacturing time), and the like, and the whole production period is long;
2. the energy consumption is high, a large amount of electricity is consumed for the volatilization of the solvent in the wet coating and drying process, and the energy consumption for the volatilization of the solvent in the wet coating process is about 50% of the total energy consumption;
3. the bonding strength is a problem in that the binder and the conductive agent float near the surface during the solvent evaporation stage of wet coating, and the active material precipitates, the electrode delaminates, the bonding strength between the active material and the current collector is reduced, and cracks, delamination, poor flexibility, and the like are easily caused.
In contrast, the dry method can perfectly solve the defect of the wet method process, and the dry pole piece mainly comprises a carbon film, conductive paint and aluminum foil. For dry processes, the product manufacturing process can be simplified to: dry mixing, calendaring, slitting, vacuum drying and the like.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of a dry electrode for a supercapacitor, which solves the problems of long time, low bonding strength between an active material and a current collector, cracks, layering, poor flexibility and the like of a pole piece in the dry manufacturing of the supercapacitor electrode.
The technical scheme adopted by the invention is as follows:
the preparation method of the dry electrode for the supercapacitor comprises the following steps:
respectively placing the activated carbon and the conductive carbon in different ovens, and fully removing water in a high-temperature blasting environment;
adding the fully dehydrated activated carbon and conductive carbon into a stirrer according to a certain proportion for fully stirring;
mixing the stirred powder and the binder powder according to a certain proportion, and adding the mixed materials into a ball mill for stirring;
putting the ball-milled material into a blast oven for heating treatment, and then crushing by a jet mill;
heating and jet milling in the step 4 at least twice;
then adding the mixture into an oven, and carrying out preheating treatment on the materials;
adding the heated material into a roller press for tabletting to prepare a self-supporting carbon film;
performing secondary rolling on the carbon film prepared in the previous step, and reducing the thickness of the carbon film;
and pressing the prepared carbon film and the conductive aluminum foil according to the structure of carbon film-aluminum foil-carbon film to prepare the electrode.
According to the preparation method of the dry electrode for the super capacitor, in the step 9, the temperature of equipment is controlled to be 80-150 ℃, and the line pressure of pressing needs to be controlled to be 150-500N/mm.
According to the preparation method of the dry electrode for the supercapacitor, in the step 4, heating and air current crushing are carried out twice.
According to the preparation method of the dry electrode for the supercapacitor, in the step 1, the baking temperature is set to be 30-80 ℃,
according to the preparation method of the dry electrode for the super capacitor, in the step 4, the temperature of an oven is set at 30-80 ℃, the heating time is 1-3 h, and the air current crushing pressure is 0.6-1.0 MPa;
according to the preparation method of the dry electrode for the supercapacitor, in the step 4, materials after the first jet milling are collected and stirred and mixed, the temperature is controlled to be 5-10 ℃, the stirring speed is 100r/min, and the stirring time is controlled to be 30-90 min.
According to the preparation method of the dry electrode for the supercapacitor, the heating temperature in the step 6 is the same as the rolling temperature in the step 7, and the temperature is set at 80-200 ℃;
according to the preparation method of the dry electrode for the supercapacitor, in the step 7, the speed ratio of the two rollers can be controlled to be 1:0.5-1:0.8, and the line pressure is set to be 300-1000N/mm; in the step 8, the line pressure of the secondary rolling equipment is set to be 200-800N/mm.
According to the preparation method of the dry electrode for the supercapacitor, in the step 4, materials in the cyclone collector and the dust removal collector are added into a spiral strip mixer after jet milling, stirring is carried out at a low temperature, the materials are added into a blast oven after stirring, heating treatment is carried out on the materials, and then the materials are treated through a jet mill.
According to the preparation method of the dry electrode for the super capacitor, the binder is one of polytetrafluoroethylene, polyvinylidene fluoride and polyethylene, and the molecular weight of the binder needs to be more than 6 ten thousand.
The invention utilizes the unique property of polytetrafluoroethylene that is easy to fibrillate, fibrillates the adhesive by means of extrusion or high-speed air flow impact, distributes the fibrillated adhesive on the surface of active particles and crosslinks to form a network, then forms a self-supporting carbon film by extrusion, and finally presses the carbon film on the corroded aluminum foil coated with the conductive coating by means of heating and rolling to form a dry electrode. The electrode production process has no solvent, the energy consumption and the problems caused by solvent evaporation are not existed, the time required by the drying process can be greatly shortened, the bonding strength between the active material and the current collector is low, the problems of cracks, layering, poor flexibility and the like of the electrode plate can be effectively solved, and the working hour and the energy consumption of about 18 percent and 20 percent can be reduced after the dry method is used.
Drawings
FIG. 1 is a cross-sectional scanning electron microscope image of a carbon plate.
FIG. 2 carbon film winding.
Fig. 3 high temperature load test data.
Description of the embodiments
The following further describes the details of the present invention:
the invention relates to a preparation method of a dry electrode for a super capacitor, which comprises the following raw materials: activated carbon, conductive carbon, adhesive and conductive aluminum foil. Which comprises the following steps:
and respectively placing the activated carbon and the conductive carbon in different ovens, and carrying out blast baking for 4 hours at the temperature of 100-160 ℃. In the step, the active carbon can be selected from one or more of the mixtures, and the conductive carbon can be selected from one or more of acetylene black, superP, ketjen black, carbon nanotubes and other conductive materials. Proper adjustment can be made according to the temperature and the humidity of the environment where the baking temperature and the baking practice are.
Weighing the activated carbon and the conductive carbon while the activated carbon and the conductive carbon are hot, adding 86-94 parts of the activated carbon and 0.5-6 parts of the conductive carbon into a stirrer for fully mixing, and adjusting the mixing time of materials according to the type and equipment of the added materials.
Firstly, taking out the active carbon and the conductive carbon fully mixed in the previous step, weighing 3-9 parts of binder and 90-98 parts of carbon powder, adding the mixture into a ball mill, selecting the binder which is easy to fibrillate, such as polytetrafluoroethylene, polyvinylidene fluoride, polyethylene and the like, wherein the molecular weight of the binder needs to be more than 6 ten thousand, the temperature of the ball mill needs to be controlled below 10 ℃ in the ball milling process, the temperature of the ball mill is particularly influenced by the type of the binder, the proper adjustment is needed, and the ball milling time can be controlled to be 2-4 hours based on the fact that materials become fragments. The binder that this patent used is polytetrafluoroethylene, and follow-up all parameters are the parameter that uses PTFE, need adjust to follow-up step and the parameter of other kind binders.
Filtering out the ball-milled material, placing the material in a preheated blast oven, setting the temperature of the oven at 30-80 ℃ and heating for 1-3 hours, and adjusting the heating time of the material according to the stacking thickness of the material in the secondary step.
The heated material is processed by the jet mill, and in the process of conveying the material to the jet mill, vibration feeding, suction or spiral feeding of the jet mill can be used, so that uniform and stable feeding of the feeding mechanism is required to be determined. For the pressure of the jet mill, the pressure is generally larger, the mill pressure of 0.6-1.0 MPa can be selected, the feeding mode of sucking materials is needed to be used, the feeding pressure is needed to be slightly larger than the mill pressure, the feeding rate can be set according to 40-80% of the processing capacity of the jet mill, and the feeding rate is specifically needed to be adjusted according to the working mode.
After the material is crushed by air flow, the cyclone collector and the dust collector are used for collecting the material, the collected material is simultaneously added into the ribbon stirrer for stirring and mixing, in the process, the stirring of the material is controlled at a lower temperature to the greatest extent, the temperature is controlled at 5-10 ℃, the stirring of the material is controlled at a lower rotating speed to the greatest extent, the stirring time can be controlled at 30-90 min, the stirring time can be specifically adjusted according to the quantity and the rotating speed of the material, and the time can be appropriately increased when the quantity of the material is larger, so that the materials are fully and uniformly mixed.
And (4) putting the stirred materials into a preheated blast oven again, wherein the temperature and the time of the oven are the same as those of the step (4).
The heated material is processed by the jet mill, the feeding mode of the material in the step is slightly different from that in the step 5, the vibration feeding mode cannot be used in the step, the feeding mode of the material suction by the jet mill is used for carrying out proper lifting on the feeding rate of the material, other parameters are the same as those in the step 5, adjustment is not needed, the step is added with the one-step jet mill process, the main purpose is to promote fibrillation of the adhesive, and in the actual process, the effect of high air pressure can be achieved by increasing the times if the pressure of the jet mill is lower.
And (3) after the material is subjected to jet milling, mixing the materials of the cyclone collector and the dust collector, and adding the mixture into a ribbon blender for blending, wherein parameters are the same as those of the step (6).
Placing the stirred materials in a preheated blast oven, wherein the temperature of the oven is set at 80-200 ℃, the heating time is based on the fact that the center of the materials reaches the set temperature, in the step, the materials are mainly preheated for the next step of pressing the self-supporting carbon film, the temperature of the materials is based on the set temperature of a roller press, the temperature of the materials can be slightly higher than the temperature of the roller press, and fine adjustment can be carried out according to actual conditions.
The roller of the roller press is required to be preheated firstly, after the set temperature is reached and the temperature is stable, the preheated material is added into a trough, a continuous self-supporting carbon film is rolled under the conditions of high temperature and high pressure, the carbon film with edge defects is cut off, and the rest part is rolled. In the step, the temperature setting in the tabletting process is the same as that in the step 10, the line pressure of the rollers is set to 300-1000N/mm, the specific setting needs to be adjusted according to the types of materials used and the different processing methods, the differential speed of the rollers needs to be set in the rolling process, and the speed ratio of the two rollers can be controlled to be 1:0.5-1:0.8.
The rolled carbon film is rolled for the second time, the step is mainly used for adjusting the thickness of the carbon film, the roll gap is required to be properly increased in the step, the step cannot use differential speed, the pressure of equipment is required to be properly reduced, and the line pressure can be set to be 200-800N/mm, and other parameters are the same as those in the step 11.
The prepared self-supporting carbon film and the conductive aluminum foil enter a roller press for pressing according to a sandwich structure of the carbon film-aluminum foil-carbon film, the temperature of equipment is required to be controlled to be 80-150 ℃ in the process, the thickness of the carbon film is required to be adjusted according to the thickness of the carbon film, the thickness of the carbon film is required to be properly increased, the line pressure for compounding is required to be controlled to be 150-500N/mm, and the compounding pressure is required to be properly reduced along with the thickness of the carbon film.
And (3) carrying out secondary lamination on the compounded pole piece by using a roller press, wherein the lower temperature is used as much as possible or heating is not carried out in the secondary lamination process, and the pressure is the same as that of the step (13).
And assembling the 400F capacitor by using the prepared dry pole piece, and testing the high-temperature load performance of the capacitor.
The above is exemplified by specific parameters
Examples
Embodiments of the present invention are further described below with reference to specific examples.
The embodiment provides a preparation method of a dry electrode for a super capacitor, which comprises the following raw materials: activated carbon, conductive carbon, adhesive and conductive aluminum foil.
Firstly, the active carbon and the conductive carbon are required to be respectively placed in different ovens, and are baked for 4 hours in an environment of 150 ℃. In the step, the active carbon can be selected from one or a mixture of a plurality of active carbons, the active carbon prepared by a commercial coconut shell physical activation method is selected, and the conductive carbon has strong selective conductivity and is Keqin black ECP-600JD.
And secondly, weighing the baked active carbon and the conductive carbon while the active carbon and the conductive carbon are hot, and fully mixing 86 parts of the active carbon and 5 parts of the conductive carbon in a V-shaped stirrer.
And thirdly, taking out the fully mixed active carbon and conductive carbon in the previous step, weighing 9 parts of PTFE binder powder and carbon powder, mixing, and adding the mixture into a horizontal ball mill, wherein the temperature of the ball mill is controlled below 10 ℃. The ball milling time can be controlled to be 2-4 hours, and the condition that the materials become into fragments is the criterion.
And fourthly, filtering out the ball-milled material, placing the material in a preheated blast oven, setting the temperature of the oven at 70 ℃, and continuing to heat the material for 1h after the central position of the material reaches the set temperature.
And fifthly, treating the heated material by using a jet mill in a material sucking mode. The crushing pressure of 0.9MPa is selected, the feeding pressure of the material is selected to be 0.95MPa, and the feeding is performed according to the 50% efficiency of the processing capacity of the equipment.
And sixthly, collecting the materials of the cyclone collector and the dust collector after the materials are subjected to jet milling, adding the collected materials into a ribbon blender for blending and mixing, controlling the blending of the materials at a lower temperature and a lower rotating speed as much as possible, preferably 10 ℃ and a blending speed of 100r/min, and setting the blending time to 60min.
And seventh, putting the stirred materials into a preheated blast oven again, wherein the temperature and time of the oven are the same as those of the fourth step.
And eighth step, the materials heated in the last step are processed by a jet mill, in the feeding mode of the materials in the step, the crushing pressure and the feeding pressure are the same as those in the fifth step, and the feeding speed of the materials can be properly improved, so that the materials can be fed according to 70% of the processing capacity of equipment.
And ninth, after the material is crushed by air flow, mixing the materials of the cyclone collector and the dust collector, and adding the mixture into a ribbon blender for blending, wherein parameters are the same as those in the sixth step.
And tenth, placing the stirred materials in a preheated blast oven, wherein the temperature of the oven is set at 160 ℃, the heating time is based on the condition that the center of the materials reaches the set temperature, and stopping heating after the core position reaches the set temperature.
And eleventh, firstly preheating a roller of the roller press, setting the temperature to be 150 ℃ to reach the set temperature, after the temperature is stable, adding the preheated material into a trough, rolling a continuous self-supporting carbon film under the linear pressure of 0.055t/mm, cutting off the carbon film with edge defects, and carrying out rolling treatment on the rest part. In this step, the speed ratio of the two rollers is controlled at 1:0.5.
And twelfth, rolling the rolled carbon film for the second time, wherein the line pressure used by the second rolling is 400N/mm, the differential speed is not used any more, and other parameters are the same as those in the eleventh step.
And thirteenth step, the self-supporting carbon film and the conductive aluminum foil prepared in the last step enter a roller press for lamination according to a sandwich structure of the carbon film-aluminum foil-carbon film, wherein the temperature of equipment is controlled at 120 ℃ in the process, and a pole piece is laminated by using 300N/mm line pressure.
And fourteenth step, the compounded pole piece is subjected to secondary lamination by using a roller press, heating is not performed in the secondary lamination process, and the pressure is the same as that in the thirteenth step.
Fifteenth step, the prepared dry pole piece is used for assembling the capacitor, the high-temperature load performance of the capacitor is tested, and the pole piece parameters are as follows:
| items | Length/mm | Thickness of pole piece/mm | Width/mm | Conductivity s/cm |
| Parameters (parameters) | 2200 | 0.33 | 48.1 | 1.93 |
Examples
Embodiments of the present invention are further described below with reference to specific examples.
The embodiment provides a preparation method of a dry electrode for a super capacitor, which comprises the following raw materials: activated carbon, conductive carbon, adhesive and conductive aluminum foil.
Firstly, the active carbon and the conductive carbon are required to be respectively placed in different ovens, and are baked for 4 hours in an environment of 100 ℃. In this step, the active carbon may be selected from one or more of the mixtures, and the present patent selects the active carbon prepared by a commercial coconut shell physical activation method and the conductive carbon is selected from SuperP.
And secondly, weighing the baked active carbon and the conductive carbon while the active carbon and the conductive carbon are hot, and fully mixing 94 parts of the active carbon and 0.5 part of the conductive carbon in a V-shaped stirrer.
And thirdly, taking out the fully mixed active carbon and conductive carbon in the previous step, weighing 3 parts of PTFE binder powder and 98 parts of carbon powder, mixing, and adding into a horizontal ball mill, wherein the temperature of the ball mill is controlled below 10 ℃. The ball milling time can be controlled to be 3-4 hours, and the condition that the materials become into fragments is the criterion.
And fourthly, filtering out the ball-milled material, placing the material in a preheated blast oven, setting the temperature of the oven at 30 ℃, and continuing to heat for 3 hours after the central position of the material reaches the set temperature.
And fifthly, treating the heated material by using a jet mill in a material sucking mode. The crushing pressure of 0.6MPa is selected, the feeding pressure of the material is selected to be 0.75MPa, and the feeding is performed according to the efficiency of 70% of the processing capacity of the equipment.
And sixthly, collecting the materials of the cyclone collector and the dust collector after the materials are subjected to jet milling, adding the collected materials into a ribbon blender for blending and mixing, controlling the blending of the materials at a lower temperature and a lower rotating speed as much as possible, preferably 50 ℃ and a blending speed of 100r/min, and setting the blending time to 90min.
And seventh, putting the stirred materials into a preheated blast oven again, wherein the temperature and time of the oven are the same as those of the fourth step.
And eighth step, the materials heated in the last step are processed by a jet mill, in the feeding mode of the materials in the step, the crushing pressure and the feeding pressure are the same as those in the fifth step, and the feeding speed of the materials can be properly improved, so that the materials can be fed according to 70% of the processing capacity of equipment.
And ninth, after the material is crushed by air flow, mixing the materials of the cyclone collector and the dust collector, and adding the mixture into a ribbon blender for blending, wherein parameters are the same as those in the sixth step.
And tenth, placing the stirred materials in a preheated blast oven, wherein the temperature of the oven is set at 100 ℃, the heating time is based on the condition that the center of the materials reaches the set temperature, and stopping heating after the core position reaches the set temperature.
And eleventh, firstly preheating a roller of the roller press, setting the temperature to be 150 ℃ to reach the set temperature, after the temperature is stable, adding the preheated material into a trough, rolling a continuous self-supporting carbon film under the line pressure of 539N/mm, cutting off the carbon film with edge defects, and carrying out rolling treatment on the rest part. In this step, the speed ratio of the two rollers is controlled at 1:0.8.
And twelfth, rolling the rolled carbon film for the second time, wherein the line pressure used by the second rolling is 400N/mm, the differential speed is not used any more, and other parameters are the same as those in the eleventh step.
And thirteenth step, the self-supporting carbon film and the conductive aluminum foil prepared in the last step enter a roller press for lamination according to a sandwich structure of the carbon film-aluminum foil-carbon film, wherein the temperature of equipment is controlled at 120 ℃ in the process, and a pole piece is laminated by using 300N/mm line pressure.
And fourteenth step, the compounded pole piece is subjected to secondary lamination by using a roller press, heating is not performed in the secondary lamination process, and the pressure is the same as that in the thirteenth step.
Fifteenth, the capacitor is assembled by using the prepared dry pole piece.
The preparation method of the invention utilizes the characteristic that polytetrafluoroethylene is easy to fibrillate, the adhesive is fibrillated through high-speed airflow impact and extrusion steps, the fibrillated adhesive is distributed on the surfaces of active particles and crosslinked to form a network, then a self-supporting carbon film is formed through extrusion, and finally the carbon film is pressed on the corrosion aluminum foil coated with the conductive coating through a heating and rolling mode to form a dry electrode.
The method has the advantages that no solvent is introduced in the electrode production process, the energy consumption and the problems caused by solvent evaporation are not existed, the time required by the drying process can be greatly shortened, the bonding strength between the active material and the current collector is low, the problems of cracks, layering, poor flexibility and the like of the pole piece can be effectively solved, and the labor hour and the energy consumption of 20 percent can be reduced by about 18 percent after the dry method is used.
The above example is only a preferred embodiment of the invention and is not intended to limit the invention in any way, and other variants are possible within the scope of the claims. All such improvements, modifications, and alterations should be seen as being within the spirit and scope of the invention.
Claims (10)
1. A preparation method of a dry electrode for a super capacitor is characterized by comprising the following steps of: comprises the following steps of
1) Respectively placing the activated carbon and the conductive carbon in different ovens, and fully removing water in a high-temperature blasting environment;
2) Adding the fully dehydrated activated carbon and conductive carbon into a stirrer according to a certain proportion for fully stirring;
3) Mixing the stirred powder and the binder powder according to a certain proportion, and adding the mixed materials into a ball mill for stirring;
4) Putting the ball-milled material into a blast oven for heating treatment, and then crushing by a jet mill;
5) Heating and jet milling in the step 4 at least twice;
6) Then adding the mixture into an oven, and carrying out preheating treatment on the materials;
7) Adding the heated material into a roller press for tabletting to prepare a self-supporting carbon film;
8) Performing secondary rolling on the carbon film prepared in the previous step, and reducing the thickness of the carbon film;
9) And pressing the prepared carbon film and the conductive aluminum foil according to the structure of carbon film-aluminum foil-carbon film to prepare the electrode.
2. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein: in the step 9, the temperature of the equipment is controlled to be 80-150 ℃, and the line pressure of pressing is required to be controlled to be 150-500N/mm.
3. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein: in step 4, heating and air-jet pulverizing are performed twice.
4. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein:
in the step 1, the baking temperature is set to be 30-80 ℃.
5. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein:
in the step 4, the temperature of the oven is set at 30-80 ℃, the heating time is 1-3 h, and the air current crushing pressure is 0.6-1.0 MPa.
6. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein:
in the step 4, materials after the first jet milling are collected and stirred and mixed, the temperature is controlled to be 5-10 ℃, the stirring speed is 100r/min, and the stirring time is controlled to be 30-90 min.
7. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein: the heating temperature in the step 6 is the same as the rolling temperature in the step 7, and the temperature is set at 80-200 ℃.
8. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein: in the step 7, the speed ratio of the two rollers can be controlled to be 1:0.5-1:0.8, and the line pressure is set to be 300-1000N/mm; in the step 8, the line pressure of the secondary rolling equipment is set to be 200-800N/mm.
9. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein: in the step 4, after the air current is crushed, the materials in the cyclone collector and the dust collector are added into a ribbon mixer, the mixture is stirred at a low temperature, the stirred mixture is added into a blast oven, the materials are heated, and then the materials are processed through the air current crusher.
10. The method for manufacturing a dry electrode for a supercapacitor according to claim 1, wherein: the adhesive is one of polytetrafluoroethylene, polyvinylidene fluoride and polyethylene, and the molecular weight of the adhesive needs to be more than 6 ten thousand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311647915.7A CN117747316A (en) | 2023-12-05 | 2023-12-05 | Preparation method of dry electrode for super capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311647915.7A CN117747316A (en) | 2023-12-05 | 2023-12-05 | Preparation method of dry electrode for super capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117747316A true CN117747316A (en) | 2024-03-22 |
Family
ID=90249938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311647915.7A Pending CN117747316A (en) | 2023-12-05 | 2023-12-05 | Preparation method of dry electrode for super capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117747316A (en) |
-
2023
- 2023-12-05 CN CN202311647915.7A patent/CN117747316A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111342053A (en) | Flexible integrated electrode plate and preparation method and application thereof | |
| JP5952387B2 (en) | Carbon sheet manufacturing method used for electrodes | |
| CN113611825B (en) | Preparation process of lithium battery electrode piece | |
| KR102696472B1 (en) | Powder for electrode to manufacture dry electrode for secondary battery, manufacturing method thereof, manufacturing method of dry electrode using the same, dry electrode, secondary battery comprising dry electrode, energy storage device, and manufacturing apparatus of dry electrode | |
| JP2014522563A5 (en) | ||
| CN114441408B (en) | Method for monitoring fibrosis degree in dry-method film forming process, dry-method film forming method, preparation method of dry-method electrode slice and application | |
| CN113871561A (en) | Preparation method of dry-method electrode pole piece, electrode pole piece and battery cell | |
| KR20240054956A (en) | ELECTRODE FOR electrochemical devise comprising Dry electrode film and method for MANUFACTURING the same | |
| CN112142120A (en) | Method for producing cobaltosic oxide by calcining aluminum and manganese doped small-particle-size cobalt carbonate | |
| KR20230033001A (en) | Method of manufacturing an electrode comprising a dry electrode film and an electrode for an electrochemical device therefrom | |
| CN115207290A (en) | Super capacitor and lithium ion battery electrode film and preparation method thereof | |
| CN117747316A (en) | Preparation method of dry electrode for super capacitor | |
| CN116799155A (en) | Dry electrode manufacturing method of negative electrode artificial graphite material | |
| CN108232195B (en) | Pole piece forming method of water-based ion battery based on polytetrafluoroethylene binder | |
| CN117199261A (en) | Dry pole piece, preparation method thereof and secondary battery | |
| CN112909217B (en) | Regulating and controlling method for positive electrode pore structure of lithium-sulfur battery | |
| KR20230025359A (en) | Electrode for electrochemical devise comprising dry electrode film and method for manufacturing the same | |
| WO2022141866A1 (en) | Positive electrode catalyst of magnesium metal-air battery, and continuous coating preparation method therefor | |
| CN111384408B (en) | Porous anode support body of solid oxide fuel cell and preparation method thereof | |
| CN113839009A (en) | Negative electrode slurry and preparation method thereof, negative electrode plate and secondary battery | |
| CN111146401A (en) | Preparation method of battery pole piece and battery | |
| CN117254053B (en) | High-conductivity bipolar plate and preparation method and application thereof | |
| CN112466681A (en) | Electrode and preparation method thereof | |
| KR102661426B1 (en) | ELECTRODE FOR electrochemical devise comprising Dry electrode film and method for MANUFACTURING the same | |
| CN114094120B (en) | Integrated graphite electrode for vanadium battery and vanadium battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |