CN114267896A - Method for removing coating based on cavitation bubble collapse - Google Patents
Method for removing coating based on cavitation bubble collapse Download PDFInfo
- Publication number
- CN114267896A CN114267896A CN202111578141.8A CN202111578141A CN114267896A CN 114267896 A CN114267896 A CN 114267896A CN 202111578141 A CN202111578141 A CN 202111578141A CN 114267896 A CN114267896 A CN 114267896A
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- Prior art keywords
- cavitation
- coating
- bubble collapse
- lithium ion
- ion battery
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- 238000000576 coating method Methods 0.000 title claims abstract description 41
- 239000011248 coating agent Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 34
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 13
- 229910001416 lithium ion Inorganic materials 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 7
- 230000006378 damage Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000011888 foil Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Abstract
The invention provides a method for removing a coating based on collapse of cavitation bubbles. The method not only can effectively solve the problems of easy substrate damage, substrate corrosion, uneven coating removal and the like in the coating removal process by a mechanical removal method and a chemical removal method, but also can solve various environmental pollutions and human body damages generated in the chemical removal process, is a clean, nondestructive and environment-friendly coating removal method, and can achieve the purpose of effectively recycling materials.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries and material recycling, and relates to a method for removing a coating based on cavitation bubble collapse.
Background
Lithium ion battery coatings suffer from varying degrees of damage and performance degradation during use. Therefore, the problems of coating removal are inevitably faced in recycling and repairing of waste products. The traditional coating removal mainly adopts a manual polishing method of a power sand disc or sand paper, and mainly adopts a polishing sand blasting method, laser cleaning, electromagnetic induction removal and a chemical method aiming at a serious damage area. However, these removal methods cause secondary pollution.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention aims to provide a method for removing a coating based on cavitation bubble collapse.
The technical scheme is as follows:
a method for removing a coating based on cavitation bubble collapse is characterized in that: water is used as a medium, ultrasonic is used as external excitation, and cavitation bubbles in water are induced to generate, so that the cavitation bubbles are collapsed on the surface of a lithium ion battery coating to achieve the purpose of removing the coating.
Further, a high-speed camera is used for observation, and the optimal position of the cavitation bubbles is determined so as to adjust the optimal placement position of the lithium ion battery.
Further, before the cavitation treatment, pretreatment is firstly carried out to preliminarily remove the PVDF binder on the surface of the coating.
Further, an ultrasonic transducer is adopted to generate ultrasonic waves; and fixing the lithium ion battery at the optimal position on the surface of the energy converter through a clamp according to the observation result of the high-speed camera.
Further, in the process of cavitation treatment, the lithium ion battery is turned over, so that coatings on two sides can be uniformly removed, and cavitation bubbles are prevented from continuously performing collapse on the same position.
Furthermore, two ultrasonic vibrators which are arranged side by side are arranged in the ultrasonic transducer and are coated by adopting a stainless steel structure; the device is placed in a glass cylinder for containing water to induce the generation of cavitation bubbles in the water, and the height of the water surface is at least 5cm higher than that of a lithium ion battery.
Compared with the prior art, the method and the optimized scheme thereof not only can effectively solve the problems of easy substrate damage, substrate corrosion, uneven coating removal and the like in the coating removal process by a mechanical removal method and a chemical removal method, but also can solve various environmental pollution and human body injuries generated in the chemical removal process, is a clean, nondestructive and environment-friendly coating removal method, and can achieve the purpose of effectively recycling materials.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of an experimental procedure according to an embodiment of the present invention.
FIG. 2 is a top view of a test device for recovering lithium iron phosphate based on ultrasonic cavitation in an embodiment of the present invention.
FIG. 3 is a schematic diagram of a removal verification test according to an embodiment of the present invention.
In the figure: 1-perspective glass jar; 2-lithium iron phosphate sample; 3-a sample clamp; 4-ultrasonic transducer.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
1. test method
The embodiment aims to recover the coating on the surface of the lithium battery cathode material by using cavitation bubbles generated by ultrasonic collapse. And observing by using a high-speed camera to determine the optimal position for generating cavitation bubbles.
2. Test procedure
The lithium battery anode material mainly comprises aluminum foil and surface anode active substances, wherein the surface active substances form coatings on the front and back surfaces of the aluminum foil. As shown in FIG. 1, this example provides a detailed procedure of an experiment, which is intended to demonstrate the main design point of the inventive scheme.
(1) Pretreatment: the sample pretreatment modes are four, namely 100 ℃ water bath heating weighing, 700 ℃ muffle furnace step-by-step high-temperature treatment and organic solvent methanol treatment
(2) The sample is fixed to the transducer surface. The manner of attachment is shown in figure 2.
Two parallel ultrasonic vibrators (with the frequency of 40KHZ and the power of 0-100W adjustable) are arranged in the transducer, a stainless steel structure is adopted for cladding, and a stainless steel pipe is arranged on the stainless steel structure and is used for connecting a power line of the transducer.
The ultrasonic transducer 4 is arranged in the see-through glass cylinder 1, and a flash lamp and a high-speed camera are arranged right in front to observe the generation of cavitation bubbles and the removal effect of the coating.
And fixing a lithium iron phosphate sample 2 (replacing a lithium ion battery) at a position on the surface of the transducer where more cavitation bubbles are generated by adopting a sample clamp 3.
(3) And adding clear water into the container, wherein the water level is 5cm higher than the sample.
(4) And (3) carrying out debugging tests of camera focal length, pixels, horizontal resolution, backlight compensation and the like in the ultrasonic cavitation process, setting the ultrasonic power to 80W, and starting an ultrasonic generator. And observing the position of the generated cavitation bubbles.
(5) The number of frames taken per unit time by the high-speed camera was set to 10000 frames/sec using a PC.
(6) And starting the ultrasonic generator. The front and back turning over is carried out on the sample after every five minutes, so that coatings on two sides of the sample can be uniformly removed, and the collapse of cavitation bubbles at the same position is avoided, so that the structure of the sample is damaged.
(7) After 15 minutes, complete peeling of the sample surface coating was observed.
(8) And taking out the sample, and drying the sample at constant temperature in vacuum at 60 ℃ for 0.5 h.
(9) And weighing the mass of the sample after the coating is removed, and calculating the removal efficiency.
The test for the removal portion provided in this example was completed, and as shown in fig. 3, a verification test for material recovery was performed as follows.
And uniformly mixing the recovered anode coating material, acetylene black and PVDF in a sample tube according to the mass ratio of 8:1: 1.
(10) 4 to 5 drops of NMP solvent are added dropwise to the above-mentioned substance until the above-mentioned mixed sample becomes viscous.
(11) And putting the sample tube into a ball mill for ball milling for 30-50 min, and fully mixing.
(12) Weighing the blank aluminum foil, and coating the aluminum foil by using a brush.
(13) And (5) after the sample coating is finished, putting the sample into a drying box, and drying the sample at 80 ℃ for one night.
(14) Taking out the prepared pole piece, and putting the pole piece into a tablet press for tabletting.
(15) And putting the pole piece into a battery shell for assembly.
The assembly sequence is as follows: anode shell
Pole piece
Diaphragm
Lithium block
Electrolyte solution
Foamed nickel
Cathode shell
(the entire assembly process is carried out in a glove box)
(16) Tabletting by a tabletting machine, standing for 2h to fully soak the substances in the battery, and measuring the cycle performance of the battery.
3. Test results
The coating removal efficiency can reach 77.5%. The secondary regeneration electrochemical performance of the recovered coating is good, and the capacitance ratio can reach 145 mAh/g.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
The present invention is not limited to the above preferred embodiments, and other various methods for removing the coating based on cavitation bubble collapse can be derived by anyone in the light of the present patent, and all equivalent changes and modifications made in the claims of the present invention shall fall within the scope of the present patent.
Claims (6)
1. A method for removing a coating based on cavitation bubble collapse is characterized in that: water is used as a medium, ultrasonic is used as external excitation, and cavitation bubbles in water are induced to generate, so that the cavitation bubbles are collapsed on the surface of a lithium ion battery coating to achieve the purpose of removing the coating.
2. The method for achieving coating removal based on cavitation bubble collapse as claimed in claim 1, characterized in that: and observing by using a high-speed camera, and determining the optimal position of the generated cavitation bubbles so as to adjust the optimal placement position of the lithium ion battery.
3. The method for achieving coating removal based on cavitation bubble collapse as claimed in claim 1, characterized in that: before cavitation treatment, pretreatment is firstly carried out to preliminarily remove the PVDF binder on the surface of the coating.
4. The method for achieving coating removal based on cavitation bubble collapse as claimed in claim 2, characterized in that: generating ultrasonic waves by adopting an ultrasonic transducer; and fixing the lithium ion battery at the optimal position on the surface of the energy converter through a clamp according to the observation result of the high-speed camera.
5. The method for achieving coating removal based on cavitation bubble collapse as claimed in claim 4, characterized in that: in the process of cavitation treatment, the lithium ion battery is turned over, so that coatings on two sides can be uniformly removed, and cavitation bubbles are prevented from continuously performing collapse on the same position.
6. The method for achieving coating removal based on cavitation bubble collapse as claimed in claim 4, characterized in that: two ultrasonic vibrators which are arranged side by side are arranged in the ultrasonic transducer and are coated by adopting a stainless steel structure; the device is placed in a glass cylinder for containing water to induce the generation of cavitation bubbles in the water, and the height of the water surface is at least 5cm higher than that of a lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111578141.8A CN114267896A (en) | 2021-12-22 | 2021-12-22 | Method for removing coating based on cavitation bubble collapse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111578141.8A CN114267896A (en) | 2021-12-22 | 2021-12-22 | Method for removing coating based on cavitation bubble collapse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114267896A true CN114267896A (en) | 2022-04-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111578141.8A Pending CN114267896A (en) | 2021-12-22 | 2021-12-22 | Method for removing coating based on cavitation bubble collapse |
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|---|---|
| CN (1) | CN114267896A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1547593A (en) * | 1975-07-04 | 1979-06-20 | Goof Sven Karl Lennart | Apparatus for removing material coatings from interior surfaces of containers |
| JP2007287626A (en) * | 2006-04-20 | 2007-11-01 | Fdk Corp | Manufacturing method of electrode for fuel cell and electrode for fuel cell |
| CN105742742A (en) * | 2016-03-09 | 2016-07-06 | 中航锂电（洛阳）有限公司 | Method for eliminating foreign gas in lithium-ion battery |
| CN107649467A (en) * | 2017-09-05 | 2018-02-02 | 哈尔滨学院 | Pipeline cavitation cleaning performance detecting system |
| CN107666970A (en) * | 2015-04-24 | 2018-02-06 | 韦伯超声波股份公司 | The apparatus and method of component burr are removed with ultrasonic wave |
| CN108832216A (en) * | 2018-06-14 | 2018-11-16 | 合肥工业大学 | A kind of pre-treating method of waste power lithium battery recycling |
| CN110508566A (en) * | 2019-08-27 | 2019-11-29 | 天津科技大学 | Surface descaling method based on multifrequency leakage supersonic guide-wave |
| CN113369699A (en) * | 2021-06-22 | 2021-09-10 | 山东大学 | Method for removing graphite on surface of diamond by using laser-induced bubble cavitation |
-
2021
- 2021-12-22 CN CN202111578141.8A patent/CN114267896A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1547593A (en) * | 1975-07-04 | 1979-06-20 | Goof Sven Karl Lennart | Apparatus for removing material coatings from interior surfaces of containers |
| JP2007287626A (en) * | 2006-04-20 | 2007-11-01 | Fdk Corp | Manufacturing method of electrode for fuel cell and electrode for fuel cell |
| CN107666970A (en) * | 2015-04-24 | 2018-02-06 | 韦伯超声波股份公司 | The apparatus and method of component burr are removed with ultrasonic wave |
| CN105742742A (en) * | 2016-03-09 | 2016-07-06 | 中航锂电（洛阳）有限公司 | Method for eliminating foreign gas in lithium-ion battery |
| CN107649467A (en) * | 2017-09-05 | 2018-02-02 | 哈尔滨学院 | Pipeline cavitation cleaning performance detecting system |
| CN108832216A (en) * | 2018-06-14 | 2018-11-16 | 合肥工业大学 | A kind of pre-treating method of waste power lithium battery recycling |
| CN110508566A (en) * | 2019-08-27 | 2019-11-29 | 天津科技大学 | Surface descaling method based on multifrequency leakage supersonic guide-wave |
| CN113369699A (en) * | 2021-06-22 | 2021-09-10 | 山东大学 | Method for removing graphite on surface of diamond by using laser-induced bubble cavitation |
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