CN216288514U - Battery electrode plate based on tin phase change - Google Patents
Battery electrode plate based on tin phase change Download PDFInfo
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- CN216288514U CN216288514U CN202122664352.5U CN202122664352U CN216288514U CN 216288514 U CN216288514 U CN 216288514U CN 202122664352 U CN202122664352 U CN 202122664352U CN 216288514 U CN216288514 U CN 216288514U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
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Abstract
The utility model provides a battery electrode plate based on tin phase change. According to the tin phase change-based battery electrode plate, the tin coating is arranged between the current collector and the electrode active substance, and the characteristic that metallic white tin can be quickly converted into flocculent or powdery gray tin at low temperature is utilized, so that the current collector and the electrode active substance are quickly separated. The utility model can also print a layer of conductive agent on the surface of the tin coating by gravure printing, on one hand, the problem of resistance rise of the tin coating caused by oxidation can be prevented; on the other hand, the conductive agent can be embedded into the tin-plated layer with a smooth surface through gravure printing, so that the adhesion degree of the electrode active material and the current collector is improved, and the electrical property and the use safety of the battery are further improved. The method obviously simplifies the steps of separating and recycling the electrode active substances, and has important significance for the preparation and recycling of the electrode slice.
Description
Technical Field
The utility model relates to the technical field of battery devices, in particular to a battery electrode plate based on tin phase change.
Background
A large number of lithium ion batteries are in active retirement each year. The lithium ion battery contains elements such as nickel, cobalt, manganese, phosphorus, lithium and the like, and if the retired lithium ion battery cannot be recycled properly, the environment is easily polluted. On the other hand, for the recovery of metal resources, the dependence of China on resource import can be reduced. The lithium ion battery recovery process at the present stage mainly comprises a fire method and a wet method, and both the two process routes need to consume a large amount of energy and also cause certain burden on the environment.
The anode material of the lithium ion battery is repaired by a novel process, and has the characteristics of less pollution, low energy consumption, simple process flow and the like. However, for the repair process of the lithium ion battery anode material, the anode material needs to be stripped from the aluminum current collector in the pretreatment process. The stripping methods used at present are methods of stripping by using organic solvents or mechanical vibration, but the two methods have poor efficiency, and the aluminum foil is easily broken into fragments to be mixed into the stripped positive electrode material, and the performance of the repaired positive electrode material is affected.
In view of the above, there is a need for an improved electrode tab for a battery based on tin phase transition to solve the above problems.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a battery electrode plate based on tin phase transition. The tin coating is arranged between the current collector and the electrode active substance, and the characteristic that metallic white tin can be quickly converted into flocculent or powdery gray tin at low temperature is utilized, so that the current collector and the electrode active substance are quickly separated, the steps of separating and recycling the electrode active substance are obviously simplified, and the method has important significance for the preparation and recycling of the electrode plate.
In order to realize the purpose of the utility model, the utility model provides a battery electrode plate based on tin phase transition, which comprises a current collector and an electrode active substance, wherein a tin coating is arranged between the current collector and the electrode active substance; and realizing the separation of the electrode active material and the current collector by utilizing the state transition of the tin-plated layer in a low-temperature environment.
As a further development of the utility model, the temperature range of the low-temperature environment is less than 13.2 ℃.
As a further improvement of the utility model, the thickness of the tin-plated layer is 0.5-3.0 μm.
As a further improvement of the utility model, one or more of bismuth, lead, antimony, silver and gold are also added into the tin-plated layer for adjusting the state transition rate and the temperature of the tin-plated layer.
As a further improvement of the present invention, the current collector is an aluminum foil current collector, and the electrode active material is a positive electrode active material.
As a further improvement of the present invention, after the electrode active material is separated from the current collector, the electrode active material is separated from the powdered gray tin by a method of tape gluing roller, vibratory screening or air flow classification.
As a further improvement of the present invention, before the electrode active material is adhered to the surface of the tin-plated layer, an uneven layer is provided on the surface of the tin-plated layer to improve the adhesion effect of the electrode active material.
As a further improvement of the utility model, the surface of one side of the tin-plated layer, which is in contact with the electrode active material, is also provided with a layer of conductive agent so as to improve the conductivity of the battery electrode plate.
As a further improvement of the utility model, the conductive agent is embedded into the surface of the tin plating layer by a gravure printing method.
The utility model also provides a method for disassembling the electrode plate of the battery based on tin phase change, which comprises the following steps:
s1, placing the electrode plate of the battery below the state transition temperature of the tin coating to enable white tin in the tin coating to be converted into flocculent or powdery gray tin, and separating the electrode active substance from the current collector;
s2, separating the electrode active substance from the flocculent or powdery gray tin by a method of carrying out adhesive roller, vibration screening or air flow classification to obtain the electrode active substance.
The utility model has the beneficial effects that:
1. according to the tin phase change-based battery electrode plate, the tin coating is arranged between the current collector and the electrode active substance, and the current collector and the electrode active substance are quickly separated by utilizing the characteristic that metallic white tin can be quickly converted into flocculent or powdery gray tin at low temperature. The method has the advantages of high separation efficiency and purity, low energy consumption and little pollution, obviously simplifies the step of separating and recycling the electrode active substances, and has important significance for the preparation and recycling of the electrode slice.
2. According to the utility model, the concave-convex layer is arranged on the surface of the tin coating, so that the surface roughness of the tin coating is improved, the bonding effect of the electrode active substance is further improved, the electrode active substance is prevented from falling off from the tin-plated current collector, the falling anode material is prevented from contacting with the cathode, the internal short circuit is caused, and the safety of the battery is reduced.
3. The utility model preferably prints a layer of conductive agent on the surface of the tin-plated layer by gravure printing, and can simultaneously realize the preparation of the concave-convex layer and the conductive agent. On one hand, the problem of resistance rise of the tin coating due to oxidation can be prevented; on the other hand, the conductive agent can be embedded into the tin-plated layer with a smooth surface through gravure printing, so that the adhesion degree of the electrode active material and the current collector is improved, and the electrical property and the use safety of the battery are further improved.
4. The utility model adjusts the state transition rate and the transition temperature of the tin coating by adding one or more of metals such as bismuth, lead, antimony, silver, gold and the like in the tin coating to adapt to different use environments, thereby having high adjustability and wide application range.
Drawings
Fig. 1 is a schematic structural view of a battery electrode tab based on tin phase transition provided by the present invention.
Fig. 2 is another schematic structural diagram of the electrode tab of the tin-based phase change battery provided by the utility model.
Reference numerals
10-a current collector; 20-tin plating; 21-a relief layer; 30-electrode active material.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown in the specific embodiments, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the electrode sheet for a battery based on tin phase transition according to the present invention includes a current collector 10 and an electrode active material 30. Among them, a tin-plated layer 20 is provided between the current collector 10 and the electrode active material 30. With this arrangement, the separation of the electrode active material 30 from the current collector 10 is achieved by utilizing the state transition of the tin-plated layer 20 in a low-temperature environment, i.e., the metallic white tin (β tin) is rapidly converted into flocculent or powdery gray tin (α tin) at a low temperature. Further, since the tin-plated layer 20 is excellent in ductility, cracks do not occur at the time of rolling or winding of the electrode sheet.
Wherein the temperature range of the low-temperature environment is less than 13.2 ℃, preferably less than 0 ℃, more preferably less than-10 ℃, and more preferably less than-30 ℃. The thickness of the tin-plated layer 20 is generally 0.5 to 3.0 μm, and the influence on the energy density of the battery is small in this range, but not limited thereto, and may be set according to the actual use requirement.
In particular, one or more of metals such as bismuth, lead, antimony, silver, gold, etc. are further added to the tin-plated layer 20 for adjusting the state transition rate and the transition temperature of the tin-plated layer 20. For example, the temperature can be set according to the use environment of the electrode plate of the battery, and when the electrode plate needs to be used in a low-temperature environment, the transition temperature is usually regulated to a lower temperature so as to prevent the electrode active substances from falling off in the use process and influencing the use safety of the battery.
In some embodiments, the current collector 10 is an aluminum foil current collector 10, and the electrode active material 30 is a positive electrode active material. Through the aluminium mass flow body of plating the tin layer, can be convenient for anodal active material to peel off 1 from lithium ion battery electrode piece, realize quick separation and retrieve. For example, when the positive active material is stripped for material repair after the lithium ion battery is out of service, the positive active material with the current collector can be placed in an environment below-30 ℃, and the positive active material is separated from the aluminum current collector by utilizing the characteristic that metallic white tin (beta tin) is rapidly converted into flocculent or powdery gray tin (alpha tin) at low temperature. The separated positive electrode material can separate the positive electrode active material from the powder gray tin by means of adhesive rollers, vibration screening, air flow classification and the like.
The utility model relates to an assembling method of a battery electrode plate based on tin phase change, which comprises the following steps: firstly, selecting a current collector 10, and then preparing a tin coating 20 on one side or two sides of the current collector 10 by spraying, electroplating, thermal spraying and other methods on the surface of the current collector; and then, the electrode active material 30 is adhered to the outer surface of the tin-plated layer 20 through a binder, thus obtaining the electrode plate of the battery. When the pole piece is in a low-temperature state (below minus 30 ℃), the speed of converting white tin (beta tin) into gray tin (alpha tin) is very high, and the engineering efficiency can be greatly improved. In addition, the volume of the tin layer expands when white tin (β tin) is converted into gray tin (α tin), and thus the electrode active material 30 is easily separated from the current collector 10.
In particular, referring to fig. 2, in consideration of the problems that the tin-plated layer 20 is exposed to air and the surface of the tin-plated layer 20 is oxidized into a dense tin oxide film by air, which leads to the decrease of the conductivity of the tin-plated layer 20, and the surface of the tin-plated layer 20 is smooth, if the electrode active material 30 is directly coated on the surface of the tin-plated layer 20, the adhesion degree of the electrode active material 30 is not good, and the electrode plate is easily separated from the tin-plated current collector 10, the utility model further improves the structure of the electrode plate of the battery, specifically as follows:
before the surface of the tin coating 20 is adhered with the electrode active material 30, the surface of the tin coating 20 is firstly provided with the concave-convex layer 21, so that the surface roughness of the tin coating 20 is improved, the bonding effect of the electrode active material 30 is further improved, the electrode active material 30 is prevented from falling off from the tin-plated current collector 10, the falling anode material and the falling cathode are contacted, the internal short circuit is caused, and the safety of the battery is reduced. The relief layer 21 may be structured by gravure printing, chemical etching or plasma treatment, etc. So set up, when tin coating 20 exposes in the air, when the surface is the compact tin oxide film by air oxidation, can also crush the oxide layer, exposes the metallic tin layer under the oxide layer covers to reduce tin coating's resistance.
The surface of the tin-plated layer 20, which is in contact with the electrode active material 30, is further provided with a layer of conductive agent to improve the conductivity of the electrode sheet of the battery. The conductive agent can be SUPER-P, KS-6, conductive graphite, carbon nanotube, graphene, carbon fiber VGCF, acetylene black, Ketjen black, etc. The conductive agent is preferably embedded into the surface of the tin-plated layer 20 by a gravure printing method. By the operation, the conductive agent is embedded into the tin-plated layer 20 with a smooth surface, and the preparation of the concave-convex layer 21 and the conductive agent can be simultaneously realized, so that the conductivity and the use safety of the electrode plate of the battery are improved.
The utility model also provides a method for disassembling the electrode plate of the battery based on tin phase change, which comprises the following steps:
s1, placing a battery electrode plate below the state transition temperature of a tin coating 20 to enable white tin in the tin coating 20 to be converted into flocculent or powdery gray tin, enabling the tin coating 20 to fall off from a current collector 10, and enabling an electrode active substance 30 to fall off from the current collector 10;
and S2, separating the electrode active substance 30 from flocculent or powdery gray tin by methods such as adhesive rollers, vibration screening or airflow classification and the like to obtain the electrode active substance 30.
According to the technical scheme, the electrode active substances 30 can be quickly separated and recovered in a physical separation mode, and compared with the recovery by a pyrogenic process or a wet process in the prior art, the method has the advantages that the energy consumption is remarkably saved, the environment is not polluted, and the method has a wide application prospect; in addition, the electrode active material 30 recycled by the method is basically free of aluminum, has high purity and high recycling value, and has important significance for sustainable development of the electrode plate of the battery.
In summary, the present invention utilizes the characteristic that metallic white tin can be rapidly transformed into flocculent or powdery gray tin at a low temperature by disposing the tin-plated layer between the current collector and the electrode active material, so that the current collector and the electrode active material are rapidly separated. The utility model also prints a layer of conductive agent on the surface of the tin-plated layer by gravure printing, and can simultaneously realize the preparation of the concave-convex layer and the conductive agent. On one hand, the problem of resistance rise of the tin coating due to oxidation can be prevented; on the other hand, the conductive agent can be embedded into the tin-plated layer with a smooth surface through gravure printing, so that the adhesion degree of the electrode active material and the current collector is improved, and the electrical property and the use safety of the battery are further improved. The method has the advantages of high separation efficiency and purity, low energy consumption and little pollution, obviously simplifies the step of separating and recycling the electrode active substances, and has important significance for the preparation and recycling of the electrode slice.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (8)
1. A battery electrode plate based on tin phase change comprises a current collector and an electrode active substance, and is characterized in that a tin coating is arranged between the current collector and the electrode active substance; separating the electrode active material from the current collector by using the state transition of the tin-plated layer in a low-temperature environment; the temperature range of the low temperature environment is less than 13.2 ℃.
2. The tin phase transition-based battery electrode sheet of claim 1, wherein the low temperature environment has a temperature range of less than 0 ℃.
3. The tin phase transition-based battery electrode tab according to claim 1, wherein the tin-plated layer has a thickness of 0.5-3.0 μm.
4. The tin phase transition-based battery electrode sheet according to claim 1, wherein the current collector is an aluminum foil current collector, and the electrode active material is a positive electrode active material.
5. The tin phase transition-based battery electrode sheet according to claim 1, wherein the electrode active material is separated from the powdered gray tin by a method of tape adhesive roller, vibratory screening or air flow classification after the electrode active material is separated from the current collector.
6. The tin phase transition-based battery electrode tab according to any one of claims 1 to 5, wherein a concavo-convex layer is provided on the surface of the tin-plated layer before the electrode active material is adhered to the surface of the tin-plated layer to improve the binding effect of the electrode active material.
7. The electrode tab for batteries based on tin phase transition as defined in claim 6, wherein the surface of the tin-plated layer on the side contacting the electrode active material is further provided with a layer of conductive agent to improve the conductivity of the electrode tab for batteries.
8. The tin phase transition-based battery electrode sheet according to claim 7, wherein the conductive agent is embedded in the surface of the tin plating layer by a gravure printing method.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122664352.5U CN216288514U (en) | 2021-11-01 | 2021-11-01 | Battery electrode plate based on tin phase change |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122664352.5U CN216288514U (en) | 2021-11-01 | 2021-11-01 | Battery electrode plate based on tin phase change |
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| CN216288514U true CN216288514U (en) | 2022-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006072A (en) * | 2021-11-01 | 2022-02-01 | 武汉蔚能电池资产有限公司 | Easily-detachable battery electrode plate and detaching method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006072A (en) * | 2021-11-01 | 2022-02-01 | 武汉蔚能电池资产有限公司 | Easily-detachable battery electrode plate and detaching method thereof |
| CN114006072B (en) * | 2021-11-01 | 2023-12-26 | 武汉蔚能电池资产有限公司 | Easy-to-detach battery electrode plate and detachment method thereof |
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