CN117832381A - Dry electrode manufacturing method based on ultrasonic coating - Google Patents
Dry electrode manufacturing method based on ultrasonic coating Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 239000011248 coating agent Substances 0.000 title claims abstract description 31
- 238000000576 coating method Methods 0.000 title claims abstract description 31
- 238000002156 mixing Methods 0.000 claims abstract description 52
- 239000000843 powder Substances 0.000 claims abstract description 42
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 239000000654 additive Substances 0.000 claims abstract description 31
- 230000000996 additive effect Effects 0.000 claims abstract description 31
- 239000011230 binding agent Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000006258 conductive agent Substances 0.000 claims abstract description 25
- 239000013543 active substance Substances 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000009827 uniform distribution Methods 0.000 claims abstract description 3
- 238000004898 kneading Methods 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000010008 shearing Methods 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 7
- 239000007924 injection Substances 0.000 abstract description 7
- 230000000052 comparative effect Effects 0.000 description 26
- 238000002360 preparation method Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 230000008901 benefit Effects 0.000 description 8
- 238000000265 homogenisation Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010924 continuous production Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention relates to the technical field of electrode manufacturing, in particular to a dry electrode manufacturing method based on ultrasonic coating. Which comprises the following steps: the active substances and the conductive agent are put into a screw feeder, conveyed by a feeding screw and premixed to form powder; adding the powder into a double-screw extruder for mixing, and simultaneously adding a binder and an additive into another material injection port of the double-screw extruder; fully mixing the powder, the binder and the additive through a double-screw extruder screw to obtain uniformly distributed fiberized slurry; and (3) transferring the slurry to a current collector, and flattening by using a multi-station ultrasonic scraper and a press roller to perform uniform distribution and thinning control to finish electrode manufacturing. The invention uses ultrasonic scrapers at different stations as key working procedures of coating, the high-precision conveying pump controls the quantity of the slurry, the slurry is directly covered with a current collector, and then the X-RAY and a machine vision detection system are used for quality full detection and feedback, so that the yield loss is small.
Description
Technical Field
The invention relates to the technical field of electrode manufacturing, in particular to a dry electrode manufacturing method based on ultrasonic coating.
Background
One of the components of electronic or electric apparatus and equipment is used as two ends of input or output current in conducting medium, one of the input current is called anode or cathode, and one of the output current is called cathode or cathode, and the electrodes are of various types, such as cathode, anode, welding electrode, electric furnace electrode, etc.
The dry preparation method of the lithium battery electrode as in CN113793917a comprises the following steps: the dry preparation method has good dispersibility, low viscosity, high-efficiency and full breaking and separating capacity, and the uniform mixing of the raw materials can effectively improve the electrode performance of a lithium battery, strengthen the stability of the electrode of the lithium battery, prolong the service life of the electrode of the lithium battery, but has long and complex process, unstable quality, more waste materials, more yield loss, certain difficulty in site multi-material transportation, easy film forming, poor edge control and the like.
In order to overcome the defects of unstable manufacturing and low yield of the current dry electrode, a dry electrode manufacturing method based on ultrasonic coating is provided.
Disclosure of Invention
The invention aims to provide a dry electrode manufacturing method based on ultrasonic coating, which solves the problems in the background technology.
In order to achieve the above object, the present invention provides a dry electrode manufacturing method based on ultrasonic coating, comprising the steps of:
s1, simultaneously feeding active substances and a conductive agent into a screw feeder, conveying through a feeding screw and premixing to form powder;
s2, adding the powder into a double-screw extruder for mixing, and simultaneously adding a binder and an additive into another material injection port of the double-screw extruder;
s3, fully mixing the powder, the binder and the additive through a double-screw extruder screw to obtain uniformly distributed fiberized slurry;
and S4, transferring the slurry to a current collector, and performing uniform distribution and thinning control by using a multi-station ultrasonic scraper and a press roller to finish electrode manufacturing.
As a further improvement of the present technical solution, in S1, the mass ratio of the conductive agent is in the range of 0.5-5.0% of the total mass of the active material and the conductive agent.
As a further improvement of the technical scheme, in the step S1, the rotating speed range of the feeding screw is 30-90 rpm/min.
As a further improvement of the technical scheme, in the step S2, the premixed powder is added into a double-screw extruder for mixing through high-precision weightlessness.
As a further improvement of the technical scheme, in the step S2, the rotating speed range of the twin-screw extruder during mixing is 40-120 rpm/min.
As a further improvement of the technical scheme, in the step S3, a plurality of mixing structures are arranged on the screw of the double-screw extruder, each mixing structure comprises a transmission section, a shearing section and a kneading section which are connected, powder, a binder and an additive move through the transmission section, and after preliminary dispersion and mixing through the shearing section, the powder, the binder and the additive are kneaded by the kneading section to form fiberized slurry.
As a further improvement of the technical scheme, in the step S3, the rotating speed range of the mixing screw is 40-120 rpm/min.
As a further improvement of the present technical solution, the length of the kneading blocks is in the range of 30-60% in the total length of the mixing structure.
As a further improvement of the technical scheme, in the step S4, the frequency range of the ultrasonic scraper is 20-120 KHz.
As a further improvement of the technical scheme, in the step S4, quality full detection and feedback are carried out through an X-RAY and a machine vision detection system during homogenizing distribution and thinning control, so that closed-loop thickness adjustment and edge adjustment are formed.
In the invention, ultrasonic scrapers at different stations are used as key working procedures of coating, a high-frequency vibration principle is used for fully dispersing dry slurry or high-solid slurry, a scraper gap controls the coating height and the surface flatness, a high-precision conveying pump controls the quantity of the slurry, the slurry is directly covered with a current collector, the processing technology is simple and stable, the yield loss is small, the edge control is excellent, the production is continuous production, the efficiency is high, compared with the traditional wet electrode manufacturing technology, the 1/2 technology process is shortened, and the manufacturing cost is reduced by about 40-50%; compared with the current popular dry electrode preparation technology, the method has the advantages of about 30% in manufacturing cost and obvious advantages in technical implementation.
Compared with the prior art, the invention has the beneficial effects that:
1. in the dry electrode manufacturing method based on ultrasonic coating, ultrasonic scrapers at different stations are used as key working procedures of coating, a high-precision conveying pump is used for controlling the quantity of slurry, the slurry is directly covered with a current collector, the processing technology is simple and stable, and then the quality is fully checked and fed back by an X-RAY and machine vision detection system, so that the yield loss is small.
2. In the dry electrode manufacturing method based on ultrasonic coating, the coating is directly carried out after premixing and mixing, so that the process is shortened, no solvent is used, and the method has extremely high economic benefit and environmental benefit, and compared with the traditional dry electrode manufacturing technology, the method has the advantages of simple process, high practicability and small process loss. The energy density is higher than that of the traditional electrode.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of the mixing screw section of the present invention.
The meaning of each reference sign in the figure is:
1. a transmission section; 2. a shearing section; 3. and (3) a kneading section.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the existing wet electrode manufacturing field, the solvent is used for preparing the grade sheet, the solvent and the moisture are removed by using an oven, the preparation process of removing the assembly injection liquid has the problems of complex process, high cost and unfriendly environment, the solvent is required to be added and removed in the grade sheet preparation, then a large-scale solvent recovery device is arranged, the environment is strictly controlled, the environment is required to be integrally controlled to ISO8 and dew point humidity of-40 ℃, the product process is complex, the process is long, and a large amount of energy is consumed;
in the existing dry electrode manufacturing field, a structure of a tank and a dispersion winch is generally adopted to carry out mixing and pre-fiberizing, then rolling film forming, thinning, trimming and rolling are carried out, finally, current collector coating is carried out, wherein the rolling film forming is further thinned, trimming, rolling and current collector coating are carried out, the process is long and complex, quality is unstable, waste materials are large, and the current collector coating is carried out to further reduce yield loss, a certain difficulty is brought to site multi-material conveying, film forming is easy to break, edge control is poor, and the like.
Accordingly, referring to fig. 1-2, an object of the present embodiment is to provide a dry electrode manufacturing method based on ultrasonic coating, comprising the following steps:
s1, simultaneously feeding an active substance and a conductive agent into a screw feeder, conveying and premixing the active substance and the conductive agent through a feeding screw to form powder, wherein the mass ratio of the conductive agent in the total mass of the active substance and the conductive agent is 0.5-5.0%, the rotating speed of the feeding screw is 30-90 rpm/min, and the proper rotating speed is favorable for uniform feeding and ensures uniform mixing of the active substance and the conductive agent;
s2, adding the premixed powder into a double-screw extruder through a high-precision weightlessness scale, adding a binder and an additive into the other material injection port of the double-screw extruder, wherein the rotating speed range of the double-screw extruder during mixing is 40-120 rpm/min, and the high-precision weightlessness scale is automatic weighing equipment for realizing high-precision continuous quantitative feeding in a static weighing mode, so that the powder, particles, flaky dry powder materials and the like can be reliably, accurately and stably fed, the waste of the materials is reduced, and the consistency of the mixture is improved;
s3, fully mixing the powder, the binder and the additive through a screw of a double-screw extruder to obtain uniformly distributed fiberized slurry, wherein a plurality of mixing structures are arranged on the screw of the double-screw extruder, each mixing structure comprises a transmission section 1, a shearing section 2 and a kneading section 3 which are connected, the powder, the binder and the additive move through the transmission section 1, the powder, the binder and the additive are primarily dispersed and mixed through the shearing section 2, the kneading section 3 kneads the powder, the binder and the additive to form the fiberized slurry, the rotating speed range of the mixing screw is 40-120 rpm/min, the length ratio of the kneading section 3 is 30-60% in the total length of the mixing structures, and the high-precision structure and the small working section on the mixing screw are utilized to fully mix the powder, the binder and the additive, so that uniformly distributed fiberized tissue, namely the fiberized slurry is obtained;
s4, transferring the slurry to a current collector by using a high-precision pump, homogenizing and thinning the slurry by using a specially designed multi-station high-frequency ultrasonic scraper and a press roller to finish electrode manufacturing, wherein the frequency range of the ultrasonic scraper is 20-120 KHz, and for the slurry which is not hardened and still soft in texture, the high-frequency ultrasonic scraper can perform accurate homogenizing distribution on the premise of avoiding adhesion, and perform quality full detection and feedback by using an X-RAY and a machine vision detection system to form a closed loop to adjust the thickness and edges when performing homogenizing distribution and thinning control, for example, an X-RAY is emitted by an X-RAY generator, penetrates the inside of the electrode, is subjected to X-RAY imaging and photographing by using a machine vision detection system, processes the image by related software, performs automatic measurement and judgment, and finally meets the product process requirements.
In the invention, ultrasonic scrapers at different stations are used as key working procedures of coating, a high-frequency vibration principle is used for fully dispersing dry slurry or high-solid slurry, a scraper gap controls the coating height and the surface flatness, a high-precision conveying pump controls the quantity of the slurry, the slurry is directly covered with a current collector, the processing technology is simple and stable, the yield loss is small, the edge control is excellent, the production is continuous production, the efficiency is high, compared with the traditional wet electrode manufacturing technology, the 1/2 technology process is shortened, and the manufacturing cost is reduced by about 40-50%; compared with the current popular dry electrode preparation technology, the method has the advantages of about 30% in manufacturing cost and obvious advantages in technical implementation.
The following specific examples are provided to further illustrate a dry electrode manufacturing method based on ultrasonic coating according to the differences of process parameters in the preparation process.
Example 1: s1, simultaneously feeding an active substance and a conductive agent into a screw feeder, conveying and premixing the active substance and the conductive agent through a feeding screw to form powder, wherein the mass ratio of the conductive agent in the total mass of the active substance and the conductive agent is 1.0%, and the rotating speed of the feeding screw is 80 rpm/min;
s2, adding the premixed powder into a double-screw extruder through high-precision weightlessness, mixing, and simultaneously adding a binder and an additive into the other material injection port of the double-screw extruder, wherein the rotating speed of the double-screw extruder during mixing is 110 rpm/min;
s3, fully mixing the powder, the binder and the additive through a screw of a double-screw extruder to obtain uniformly distributed fiberized slurry, wherein the screw of the double-screw extruder is provided with a plurality of mixing structures, each mixing structure comprises a transmission section 1, a shearing section 2 and a kneading section 3 which are connected, the powder, the binder and the additive move through the transmission section 1, the powder, the binder and the additive are primarily dispersed and mixed through the shearing section 2, the kneading section 3 kneads the powder, the binder and the additive to form the fiberized slurry, the rotating speed of the mixing screw is 300 rpm/min, and the length of the kneading section 3 accounts for 30% in the total length of the mixing structures;
s4, transferring the slurry to a current collector by using a high-precision pump, performing homogenization distribution and thinning control by using a specially designed multi-station high-frequency ultrasonic scraper and a press roller to finish electrode manufacturing, wherein the frequency of the ultrasonic scraper is 40 KHz, and performing quality full detection and feedback by using an X-RAY and a machine vision detection system when performing homogenization distribution and thinning to form a closed loop to adjust thickness and edges.
Example 2: s1, simultaneously feeding an active substance and a conductive agent into a screw feeder, conveying and premixing the active substance and the conductive agent through a feeding screw to form powder, wherein the mass ratio of the conductive agent in the total mass of the active substance and the conductive agent is 3.0%, and the rotating speed of the feeding screw is 70 rpm/min;
s2, adding the premixed powder into a double-screw extruder through high-precision weightlessness, mixing, and simultaneously adding a binder and an additive into the other material injection port of the double-screw extruder, wherein the rotating speed of the double-screw extruder is 90 rpm/min during mixing;
s3, fully mixing the powder, the binder and the additive through a screw of a double-screw extruder to obtain uniformly distributed fiberized slurry, wherein the screw of the double-screw extruder is provided with a plurality of mixing structures, each mixing structure comprises a transmission section 1, a shearing section 2 and a kneading section 3 which are connected, the powder, the binder and the additive move through the transmission section 1, the powder, the binder and the additive are primarily dispersed and mixed through the shearing section 2, the kneading section 3 kneads the powder, the binder and the additive to form the fiberized slurry, the rotating speed of the mixing screw is 90 rpm/min, and the length of the kneading section 3 accounts for 50% of the total length of the mixing structures;
s4, transferring the slurry to a current collector by using a high-precision pump, performing homogenization distribution and thinning control by using a specially designed multi-station high-frequency ultrasonic scraper and a press roller to finish electrode manufacturing, wherein the frequency of the ultrasonic scraper is 36 KHz, and performing quality full detection and feedback by using an X-RAY and a machine vision detection system during the homogenization distribution and thinning control to form a closed loop to adjust the thickness and the edge.
Example 3: s1, simultaneously feeding an active substance and a conductive agent into a screw feeder, conveying and premixing the active substance and the conductive agent through a feeding screw to form powder, wherein the mass ratio of the conductive agent in the total mass of the active substance and the conductive agent is 5.0%, and the rotating speed of the feeding screw is 60 rpm/min;
s2, adding the premixed powder into a double-screw extruder through high-precision weightlessness, mixing, and simultaneously adding a binder and an additive into the other material injection port of the double-screw extruder, wherein the rotating speed of the double-screw extruder is 80 rpm/min during mixing;
s3, fully mixing the powder, the binder and the additive through a screw of a double-screw extruder to obtain uniformly distributed fiberized slurry, wherein the screw of the double-screw extruder is provided with a plurality of mixing structures, each mixing structure comprises a transmission section 1, a shearing section 2 and a kneading section 3 which are connected, the powder, the binder and the additive move through the transmission section 1, the powder, the binder and the additive are primarily dispersed and mixed through the shearing section 2, the kneading section 3 kneads the powder, the binder and the additive to form the fiberized slurry, the rotating speed of the mixing screw is 80 rpm/min, and the length of the kneading section 3 accounts for 60% in the total length of the mixing structures;
s4, transferring the slurry to a current collector by using a high-precision pump, performing homogenization distribution and thinning control by using a specially designed multi-station high-frequency ultrasonic scraper and a press roller to finish electrode manufacturing, wherein the frequency of the ultrasonic scraper is 50 KHz, and performing quality full detection and feedback by using an X-RAY and a machine vision detection system during the homogenization distribution and thinning control to form a closed loop to adjust the thickness and the edge.
Table 1 comparison of process parameters in examples 1-3;
；
comparative example 1:
the preparation method of the embodiment 1 is adopted in the comparative example, the mass ratio of the conductive agent is set to 8.0%, the rest is unchanged, the specific steps are similar to the embodiment 1, and the comparative example is not repeated.
Comparative example 2:
the preparation method of the example 1 is adopted in the comparative example, the rotating speed of the feeding screw is set to be 100 rpm/min, the rest is unchanged, the specific steps are similar to those of the example 1, and the comparative example is not repeated.
Table 2 comparison of the process parameters in example 1 with comparative examples 1-2;
；
comparative example 3:
the preparation method of the comparative example 2 is adopted, the rotating speed of the twin-screw extruder is set to 140 rpm/min, the rest is unchanged, the specific steps are similar to those of the example 2, and the comparative example is not repeated.
Comparative example 4:
the preparation method of the comparative example 2 is adopted, the screw speed of the twin-screw extruder is set to be 30 rpm/min, the rest is unchanged, the specific steps are similar to those of the example 2, and the comparative example is not repeated.
Table 3 example 2 is compared with the process parameters in comparative examples 3-4;
；
comparative example 5:
the comparative example was prepared by the method of example 3, the length ratio of the kneading block 3 was set to 65%, the rest was unchanged, and the specific procedure was similar to that of example 3, and the comparative example was not repeated.
Comparative example 6:
the comparative example adopts the preparation method of example 3, the ultrasonic doctor frequency is set to 150 KHz, the rest is unchanged, the specific steps are similar to those of example 3, and the comparative example is not repeated.
Table 4 comparison of the process parameters in example 3 with comparative examples 5-6;
；
test example:
the electrode was produced according to the production methods provided in examples 1 to 3 and comparative examples 1 to 6, respectively, and was mounted on a lithium battery, and the volumetric energy density of the lithium battery was measured according to GB/T36276-2018 lithium ion battery for electric power storage, and the measured results were shown in table 5.
Table 5 volumetric energy density of the electrodes of examples versus comparative examples;
；
as can be seen from table 5, the volumetric energy densities of the lithium batteries prepared in examples 1 to 3 and comparative examples 1 to 6 were higher than those of the lithium batteries prepared in comparative examples, and the volumetric energy densities of the lithium batteries prepared in examples were not lower than 173W h/kg, while the volumetric energy densities of the lithium batteries prepared in comparative examples using different process parameters were lower than 172W h/kg, so that the volumetric energy densities of the electrodes prepared in examples were higher under the working conditions of the present example.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A dry electrode manufacturing method based on ultrasonic coating, characterized by comprising the following steps:
s1, simultaneously feeding active substances and a conductive agent into a screw feeder, conveying through a feeding screw and premixing to form powder;
s2, adding the powder into a double-screw extruder, and simultaneously adding a binder and an additive into the other material port of the double-screw extruder;
s3, fully mixing the powder, the binder and the additive through a double-screw extruder screw to obtain uniformly distributed fiberized slurry;
and S4, transferring the slurry to a current collector, and performing uniform distribution and thinning control by using a multi-station ultrasonic scraper and a press roller to finish electrode manufacturing.
2. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the S1, the mass ratio of the conductive agent in the total mass of the active substance and the conductive agent is in the range of 0.5-5.0%.
3. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S1, the rotating speed range of the feeding screw is 30-90 rpm/min.
4. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S2, the premixed powder is added into a double-screw extruder for mixing through a high-precision weightlessness scale.
5. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S2, the rotating speed range of the twin-screw extruder during mixing is 40-120 rpm/min.
6. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S3, a plurality of mixing structures are arranged on the screw of the double-screw extruder, each mixing structure comprises a transmission section (1), a shearing section (2) and a kneading section (3) which are connected, powder, a binder and an additive move through the transmission section (1), and after preliminary dispersion and mixing of the shearing section (2), the kneading section (3) kneads the powder, the binder and the additive to form fiberized slurry.
7. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S3, the rotating speed range of the mixing screw is 40-120 rpm/min.
8. The method for manufacturing an electrode according to claim 6, wherein the dry electrode is formed by ultrasonic coating, characterized in that: the length of the kneading blocks (3) is in the range of 30 to 60% in the total length of the mixing structure.
9. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S4, the frequency range of the ultrasonic scraper is 20-120 KHz.
10. The dry electrode manufacturing method based on ultrasonic coating according to claim 1, wherein: in the step S4, quality full detection and feedback are carried out through an X-RAY and a machine vision detection system during homogenizing distribution and thinning control, so that closed-loop thickness adjustment and edge adjustment are formed.
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