CN214603663U - Surface treatment device for metal lithium strip - Google Patents
Surface treatment device for metal lithium strip Download PDFInfo
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- CN214603663U CN214603663U CN202022419136.XU CN202022419136U CN214603663U CN 214603663 U CN214603663 U CN 214603663U CN 202022419136 U CN202022419136 U CN 202022419136U CN 214603663 U CN214603663 U CN 214603663U
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- lithium metal
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 178
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 62
- 239000002184 metal Substances 0.000 title claims abstract description 62
- 238000004381 surface treatment Methods 0.000 title claims abstract description 36
- 238000004804 winding Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 17
- 238000005096 rolling process Methods 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 4
- 238000002161 passivation Methods 0.000 abstract description 22
- 239000012528 membrane Substances 0.000 abstract description 19
- 230000007547 defect Effects 0.000 abstract description 10
- 210000001787 dendrite Anatomy 0.000 abstract description 5
- 238000005498 polishing Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 5
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- 229910052734 helium Inorganic materials 0.000 description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910018957 MClx Inorganic materials 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- YZSKZXUDGLALTQ-UHFFFAOYSA-N [Li][C] Chemical compound [Li][C] YZSKZXUDGLALTQ-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- OPHUWKNKFYBPDR-UHFFFAOYSA-N copper lithium Chemical compound [Li].[Cu] OPHUWKNKFYBPDR-UHFFFAOYSA-N 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Classifications
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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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model belongs to the technical field of lithium metal batteries, in particular to a surface treatment device for a metal lithium belt, which comprises an unreeling component, a first brush roll pair, a second brush roll pair and a reeling component which are arranged in sequence according to the transmission direction of the metal lithium belt; the surface of the first brush roll pair is provided with a plurality of first bristles; the surface of the second brush roll is provided with a plurality of second bristles; the winding assembly is used for winding the metal lithium belt. The utility model provides a device, the metal lithium area is through first brush roll pair in proper order and second brush roll pair carry out mechanical polishing, first brush roll is to being used for getting rid of the passivation layer on metal lithium area surface, the second brush roll is to being used for further getting rid of the passivation layer on metal lithium area surface, and the surface defect who gets rid of the metal lithium area increases the roughness on metal lithium area surface, be convenient for follow-up even protection film of surface adhesion in the metal lithium area, improve the protection effect of protection film, prevent the production of lithium dendrite, can form superior SEI membrane after surface defect gets rid of, improve lithium metal battery's cyclicity ability.
Description
Technical Field
The utility model belongs to the technical field of lithium metal battery, especially, relate to a metal lithium area surface treatment device.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like.
Among the numerous negative electrode materials for lithium batteries, metallic lithium is considered to be the most desirable negative electrode material for lithium batteries due to its low density, high theoretical capacity and low potential. However, in the cycle process of the lithium metal negative electrode, on one hand, because the lithium metal is unevenly deposited, dendrite is easily generated on the surface, which brings a safety hazard, and on the other hand, because the volume expansion causes the repeated generation of a Solid Electrolyte Interface (SEI), the electrolyte and the lithium metal are consumed, and meanwhile, the impedance of the battery is remarkably increased. In the last decades, there have been continuously studied and reported the treatment of the surface of lithium metal, and the principle of the treatment is that a uniform protective layer is formed on the surface of lithium metal, which can help to solve the above-mentioned problems of lithium metal and improve the cycle performance of lithium metal batteries.
However, because the chemical activity of the metallic lithium is high, a passivation layer is easily formed on the surface of the metallic lithium in the rolling, transportation and storage processes, and the passivation layer easily causes the unevenness of a protective layer formed by the metallic lithium, and particularly, in the process of protecting the surface of the metallic lithium by a chemical method, a grain boundary, a defect or insufficient film formation is easily formed in the protective layer, so that the protective effect of the protective layer is seriously affected. Therefore, a flat lithium metal surface is also important for forming a lithium metal protective layer.
The passivation layer on the surface of the lithium sheet is removed by knife cutting in the literature to form a bright and flat surface, however, the method cannot be applied to the surface treatment of ultra-thin lithium strips (thickness <100 μm). Chinese patent publication No. CN107815724A discloses that a large-scale atomically flat lithium surface can be obtained by polishing a lithium metal surface by an electrochemical method, however, this method is only suitable for a laboratory stage and cannot be used for large-scale continuous production. Therefore, it is highly desirable to develop an industrialized method that can remove the passivation layer on the surface of the lithium metal without affecting the application of the lithium metal in the lithium ion battery.
In view of the above, it is necessary to provide a technical solution to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the defects of the prior art, the device for treating the surface of the metal lithium strip is provided, the passivation layer on the surface of the metal lithium strip can be removed, the flatness of the surface of the metal lithium strip is increased, and the industrial production is easy to realize.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a surface treatment device for a lithium metal strip comprises an unreeling assembly, a first brush roller pair, a second brush roller pair and a reeling assembly which are sequentially arranged in the conveying direction of the lithium metal strip; a plurality of first brush bristles are arranged on the surface of the first brush roll pair; a plurality of second brush bristles are arranged on the surface of the second brush roll pair; the rolling component is used for rolling the metal lithium belt.
As an improvement of lithium metal strip surface treatment device, still include the guide roll, the guide roll includes first guide roll set, second guide roll set and third guide roll set, first guide roll set up in unreel the subassembly with first brush roll is to between, second guide roll set up in first brush roll to with the second brush roll is to between, third guide roll set up in the second brush roll to with between the rolling subassembly. The guide rollers are used for receiving and releasing the metal lithium strips, and the number of the guide rollers can be set according to actual conditions.
As an improvement of the metal lithium strip surface treatment device, the metal lithium strip surface treatment device further comprises a floating roller, wherein the floating roller is arranged between a plurality of guide rollers of the second guide roller set. The floating roller can float up and down, automatically controls the tension, and prevents the lithium metal strip from breaking, blocking and the like in the surface treatment process.
As an improvement of the metal lithium belt surface treatment device, still include from type membrane rolling assembly, from type membrane rolling assembly set up in unreel the subassembly with first brush roll is to between, from type membrane rolling assembly be used for receive with the separation of metal lithium belt from the type membrane. When the metal lithium belt comes, the surface is attached with a release film for protecting the metal lithium belt, the release film winding assembly is used for tearing the release film, and the metal lithium belt is conveyed to the first brush roller for surface treatment.
As an improvement of metal lithium area surface treatment device, still include from the type membrane and unreel the subassembly, from the type membrane unreel the subassembly set up in the second brush roll right with between the rolling subassembly, it is used for releasing from the type membrane cover to unreel the subassembly from the type membrane metal lithium area. After the passivation layer is removed and the flatness is increased, the surface of the metal lithium strip is covered with a release film, so that dust is prevented from being attached to the surface of the metal lithium strip, and the internal short circuit is prevented when the lithium metal battery is assembled.
As an improvement of the lithium metal strip surface treatment device of the present invention, the first brush bristles are made of nylon, polypropylene, polyethylene terephthalate or polybutylene terephthalate, and the number of the first brush roller pairs is at least one pair. The material of the first bristles is preferably a polyethylene terephthalate (PET) material, which has low water absorption and does not adhere to lithium metal, compared to other materials. Wherein the nylon can adopt nylon 612 brush filaments with the diameter of 0.5 mm.
As an improvement of the lithium metal strip surface treatment device of the present invention, the second brush bristles are made of plastic or animal hair, and the second brush roller pair is at least one pair. The second bristles are preferably made of existing materials, wherein the animal hair is wool or horsehair, the raw materials of the wool or horsehair are easy to obtain and low in price, static electricity is not easy to generate, and the flatness of the surface of the metal lithium strip can be increased. Preferably, the second bristles are made of horse hair or polyethylene terephthalate and have a diameter of less than 0.1 mm. It is further preferred that the second bristles have a density greater than that of the first bristles for further increasing the flatness of the surface of the lithium metal strip.
As an improvement of the lithium metal strip surface treatment device, the lithium metal strip surface treatment device further comprises a vacuum-pumping assembly and a dust-collecting assembly, wherein the vacuum-pumping assembly is respectively corresponding to the gap between the first brush roll pair and the second brush roll pair, and the dust-collecting assembly is connected with the vacuum-pumping assembly. Specifically, evacuation subassembly includes pump-line and vacuum pump, and the collection dirt subassembly is the dust removal sack, and the mouth of pipe of pump-line corresponds the setting with the clearance of first brush roller pair, and corresponds the setting with the clearance of second brush roller pair, and when the metal lithium area carried out surface treatment, the passivation layer that the brush roller brushed out was taken out the dust removal sack from pump-line, prevents that the metal lithium dust from burning and exploding.
As an improvement of the metal lithium strip surface treatment device, the metal lithium strip surface treatment device further comprises a positive pressure gas input assembly, wherein the positive pressure gas input assembly is connected with a dryer and/or an inert gas storage tank. Wherein the inert gas comprises nitrogen, argon or helium. The dryer is used for drying air to a dew point below-40 ℃. Specifically, the positive pressure gas input assembly comprises a gas compressor and a gas output pipeline, the pipe orifice of the gas output pipeline is correspondingly arranged with the gap between the first brush roller pair and the second brush roller pair, positive pressure control is realized on the environment where the metal lithium strip is located by the positive pressure gas input assembly, and the contact between the outside air containing moisture and the metal lithium strip can be prevented.
Compared with the prior art, the utility model discloses following beneficial effect has at least: the utility model provides a surface treatment device for a lithium metal belt, which comprises an unreeling component, a first brush roll pair, a second brush roll pair and a reeling component which are arranged in sequence according to the conveying direction of the lithium metal belt; a plurality of first brush bristles are arranged on the surface of the first brush roll pair; a plurality of second brush bristles are arranged on the surface of the second brush roll pair; the rolling component is used for rolling the metal lithium belt. The utility model provides a surface treatment device is taken to lithium metal, the lithium metal area is through first brush roll pair in proper order and second brush roll pair carry out mechanical polishing, first brush roll is to being used for getting rid of the passivation layer on lithium metal area surface, the second brush roll is to being used for further getting rid of the passivation layer on lithium metal area surface, and the surface defect who gets rid of the lithium metal area increases the roughness on lithium metal area surface, be convenient for follow-up even protection film of surface adhesion in lithium metal area, improve the protection effect of protection film, prevent the production of lithium dendrite, can form superior SEI membrane after surface defect gets rid of, improve lithium metal battery's cyclicity ability. In addition, the utility model provides a metal lithium area surface treatment device for through chemistry and electrolysis processing metal lithium area, can realize the large-scale production of industrialization.
Drawings
Fig. 1 is a schematic structural diagram of a device for surface treatment of a lithium metal strip according to an embodiment of the present invention.
Fig. 2 is a Scanning Electron Micrograph (SEM) of # 1 metallic lithium ribbon.
Fig. 3 is a Scanning Electron Micrograph (SEM) of # 2 metallic lithium ribbon.
Fig. 4 is a graph showing the cycle profiles of the 3# lithium metal battery and the 4# lithium metal battery.
The device comprises a metal lithium belt 1, a metal lithium belt 2, an unreeling assembly 3, a first brush roller pair 4, a second brush roller pair 5, a reeling assembly 6, a guide roller 61, a first guide roller set 62, a second guide roller set 63, a third guide roller set 7, a floating roller 8, a release film reeling assembly 9, a release film unreeling assembly 10, a vacuum pumping assembly 11, a dust collecting assembly 12 and a positive pressure gas input assembly.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal "and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.
Examples
As shown in fig. 1, a lithium metal strip surface treatment device comprises an unreeling assembly 2, a first brush roller pair 3, a second brush roller pair 4 and a reeling assembly 5 which are sequentially arranged according to the transmission direction of a lithium metal strip 1; a plurality of first brush bristles are arranged on the surfaces of the first brush roll pairs 3; a plurality of second brush bristles are arranged on the surface of the second brush roller pair 4; the winding component 5 is used for winding the lithium metal strip 1.
The utility model provides a surface treatment device is taken to lithium metal, lithium metal area 1 carries out mechanical polishing to 3 and second brush roll through first brush roll in proper order, first brush roll is used for getting rid of the passivation layer on 1 surface in lithium metal area to 3, the second brush roll is used for further getting rid of the passivation layer on 1 surface in lithium metal area to 4, and get rid of the surface defect in lithium metal area 1 and increase the roughness on 1 surface in lithium metal area, be convenient for follow-up even protection film of surface adhesion in lithium metal area 1, improve the protection effect of protection film, prevent the production of lithium dendrite, can form superior SEI membrane after surface defect gets rid of, improve lithium metal battery's cyclicity performance.
The utility model provides a metal lithium takes surface treatment device for through chemistry and electrolytic treatment metal lithium area 1, can realize the industrialization large-scale production.
Further, the roller winding device further comprises a guide roller 6, wherein the guide roller 6 comprises a first guide roller group 61, a second guide roller group 62 and a third guide roller group 63, the first guide roller group 61 is arranged between the unwinding assembly 2 and the first brush roller pair 3, the second guide roller group 62 is arranged between the first brush roller pair 3 and the second brush roller pair 4, and the third guide roller group 63 is arranged between the second brush roller pair 4 and the winding assembly 5. The guide rollers 6 are used for receiving and releasing the lithium metal strip 1, and the number of the guide rollers 6 can be set according to actual conditions.
Further, the guide roll device also comprises a floating roll 7, and the floating roll 7 is arranged between the guide rolls 6 of the second guide roll group 62. The floating roller 7 can float up and down, automatically control the tension, and prevent the lithium metal strip 1 from breaking, blocking and the like in the surface treatment process. Further preferably, the floating roller 7 is further arranged between the unwinding assembly 2 and the release film winding assembly 8, and the floating roller 7 is further arranged between the winding assembly 5 and the release film unwinding assembly 9.
Further, still including from type membrane rolling subassembly 8, set up between unreeling subassembly 2 and first brush roll pair 3 from type membrane rolling subassembly 8, be used for receiving from the type membrane with the separation of lithium metal strip 1 from type membrane rolling subassembly 8. When the metal lithium belt 1 comes, the surface is attached with the release film for protecting the metal lithium belt 1, the release film winding assembly 8 is used for tearing the release film, and the metal lithium belt 1 is conveyed to the first brush roll for surface treatment of the first brush roll pair 3.
Further, still including unreeling the subassembly 9 from the type membrane, unreeling the subassembly 9 from the type membrane and set up between second brush roller pair 4 and rolling subassembly 5, unreeling the subassembly 9 from the type membrane and being used for releasing to cover lithium metal strip 1 from the type membrane. After the passivation layer of the metal lithium belt 1 is removed and the flatness is increased, the surface of the metal lithium belt 1 is covered with a release film, so that dust is prevented from adhering to the surface of the metal lithium belt 1, and internal short circuit is prevented when the lithium metal battery is assembled.
Further, the first brush bristles are made of nylon, polypropylene, polyethylene terephthalate or polybutylene terephthalate, and the number of the first brush roller pairs 3 is at least one. The material of the first bristles is preferably a polyethylene terephthalate (PET) material, which has low water absorption and does not adhere to lithium metal, compared to other materials. Wherein the nylon can adopt nylon 612 brush filaments with the diameter of 0.5 mm.
Further, the second brush bristles are made of polyethylene terephthalate or animal hair, and the number of the second brush roller pairs 4 is at least one. The second bristles are preferably made of an existing material, wherein the animal hair is wool or horse hair, the raw materials of the wool or the horse hair are easy to obtain and low in price, static electricity is not easy to generate, and the flatness of the surface of the metal lithium strip 1 can be increased. Preferably, the second bristles are made of horse hair or polyethylene terephthalate and have a diameter of less than 0.1 mm. It is further preferable that the density of the second bristles is greater than that of the first bristles for further increasing the flatness of the surface of the lithium metal strip 1.
Furthermore, the brush roller cleaning device further comprises a vacuum-pumping assembly 10 and a dust collecting assembly 11, wherein the vacuum-pumping assembly 10 is arranged corresponding to the gaps between the first brush roller pair 3 and the second brush roller pair 4 respectively, and the dust collecting assembly 11 is connected with the vacuum-pumping assembly 10. Specifically, evacuation subassembly 10 includes pump-line and vacuum pump, and collection dirt subassembly 11 is the dust removal sack, and the mouth of pipe of pump-line corresponds the setting with the clearance of first brush roll to 3, and corresponds the setting with the clearance of second brush roll to 4, and when metal lithium area 1 carried out surface treatment, the passivation layer that the brush roll brushed out was taken out the dust removal sack from pump-line, prevents that the metal lithium dust from burning and exploding.
Further, the device also comprises a positive pressure gas input assembly 12, and a dryer and/or an inert gas storage tank are connected to the positive pressure gas input assembly 12. Wherein the inert gas comprises nitrogen, argon or helium. The dryer is used for drying air to a dew point below-40 ℃. Specifically, malleation gas input assembly 12 includes gas compressor and gaseous output pipeline, and the mouth of pipe of gaseous output pipeline sets up with the clearance correspondence of first brush roller pair 3 and second brush roller pair 4, and malleation gas input assembly 12 realizes malleation control to the environment that lithium metal strip 1 was located, can prevent that the external air that contains moisture from taking 1 contact with lithium metal.
The working process of the device is as follows:
s1, the unwinding assembly 2 unwinds the metal lithium strip 1 coil; the release film winding assembly 8 winds the release film attached to the surface of the lithium metal strip 1, the lithium metal strip 1 is transmitted to a gap between the first brush roller pair 3 through the guide roller 6, the first brush brushes on the surface of the first brush roller pair 3 rub the surface of the lithium metal strip 1, and the passivation layer on the surface of the lithium metal strip 1 is removed; an air exhaust pipeline of the vacuumizing assembly 10 is aligned with a gap of the first brush roll pair 3, passivation layer powder removed from the surface of the metal lithium belt 1 is absorbed into a dust removal cloth bag, positive pressure gas is input into the assembly 12 to work, and the operation space is ensured to be dry air or inert atmosphere;
s2, the metal lithium belt 1 is conveyed to a gap between a second brush roller pair 4 after the tension is adjusted through a second guide roller group 62 and a floating roller 7, a second brush hair on the surface of the second brush roller pair 4 is used for rubbing the surface of the metal lithium belt 1, a passivation layer on the surface of the metal lithium belt 1 is further removed, the flatness of the surface of the metal lithium belt 1 is increased, an air suction pipeline of the vacuumizing assembly 10 is also aligned to the gap between the second brush roller pair 4, passivation layer powder removed on the surface of the metal lithium belt 1 is absorbed into a dust removal cloth bag, the positive pressure gas input assembly 12 works, and the operation space is guaranteed to be dry air or inert atmosphere;
s3, after the lithium metal strip 1 passes through the second brush roller pair 4, the release film unreeling component 9 unreels the release film, attaches to the surface of the processed lithium metal strip 1, and is reeled by the reeling component 5.
And S4, immersing the lithium metal strip 1 in a protective solution, and drying to obtain the surface-treated lithium metal strip 1.
Wherein the method is carried out in a dry environment with a dew point below-40 deg.C or in an oxygen-free and water-free inert gas environment, wherein the inert gas comprises nitrogen, helium or argon. Since lithium metal is chemically active and is easily exploded by exposure to moisture in the air, the dew point needs to be strictly limited.
Wherein, the metal lithium strip 1 comprises a copper lithium composite strip, a carbon lithium composite strip or a lithium metal strip, and the thickness of the metal lithium strip 1 is less than 100 μm. The utility model discloses be particularly useful for the ultra-thin metal lithium area 1 that thickness is less than 100 mu m, be convenient for realize industrial production.
The protective solution comprises at least one of fluoroethylene carbonate, ethyl orthosilicate, silicone oil, 1, 3-dioxolane, tetrahydrofuran and MClx solution, wherein M is As, In, Bi or Zn. Wherein, the soaking time is 4-6 h, and can be specifically set according to the actual condition.
Comparative example
This comparative example provides a lithium metal tape that was placed directly in a protective solution without the device treatment of example 1.
And (3) performance testing:
the metallic lithium ribbon 1 obtained after the treatment using the apparatus in the example was recorded as a # 1 lithium ribbon, the metallic lithium ribbon 1 obtained in the comparative example was recorded as a # 2 lithium ribbon, and scanning electron micrographs of the # 1 lithium ribbon and the # 2 lithium ribbon were respectively shown in fig. 2 to 3, in which the length of a white space in the drawings was 50 μm. As can be seen from the figure, the surface of the No. 1 lithium ribbon is smoother and flatter, while the surface of the No. 2 lithium ribbon has a plurality of protrusions, which indicates that the surface of the No. 2 lithium ribbon has a passivation layer.
The 1# lithium tape and the 2# lithium tape were assembled as a negative electrode tab with a positive electrode tab and a separator into a lithium metal battery, which were recorded as a 3# battery and a 4# battery in this order.
The cycle performance test was performed on the 3# battery and the 4# battery, respectively, and the test results are shown in fig. 4. As can be seen from fig. 4, the cycle performance of the 3# battery is better because the 1# metallic lithium strip 1 sequentially passes through the first brush roller pair 3 and the second brush roller pair 4 for mechanical polishing, the first brush roller pair 3 is used for removing the passivation layer on the surface of the metallic lithium strip 1, the second brush roller pair 4 is used for further removing the passivation layer on the surface of the metallic lithium strip 1, and removing the surface defects of the metallic lithium strip 1 to increase the flatness of the surface of the metallic lithium strip 1, so that a uniform protective film can be attached to the surface of the metallic lithium strip 1 subsequently, the protective effect of the protective film is improved, the generation of lithium dendrites is prevented, and a superior SEI film can be formed after the surface defects are removed, thereby improving the cycle performance of the lithium metal battery.
Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (7)
1. A surface treatment device for a lithium metal strip is characterized by comprising an unreeling assembly, a first brush roller pair, a second brush roller pair and a reeling assembly which are sequentially arranged in the conveying direction of the lithium metal strip; a plurality of first brush bristles are arranged on the surface of the first brush roll pair; a plurality of second brush bristles are arranged on the surface of the second brush roll pair; the rolling component is used for rolling the metal lithium belt.
2. The lithium metal strip surface treatment device of claim 1, further comprising guide rollers including a first guide roller set disposed between the unwinding assembly and the first pair of brush rollers, a second guide roller set disposed between the first pair of brush rollers and the second pair of brush rollers, and a third guide roller set disposed between the second pair of brush rollers and the winding assembly.
3. The lithium metal strip surface treatment device according to claim 2, further comprising a dancer roll disposed between the plurality of guide rolls of the second guide roll group.
4. The device for surface treatment of the lithium metal strip of claim 1, further comprising a release film winding assembly disposed between the unwinding assembly and the pair of first brush rollers, the release film winding assembly configured to receive a release film separated from the lithium metal strip.
5. The device for surface treatment of the lithium metal strip of claim 1, further comprising a release film unwinding assembly, wherein the release film unwinding assembly is arranged between the second pair of brush rollers and the winding assembly, and the release film unwinding assembly is used for releasing a release film to cover the lithium metal strip.
6. The lithium metal strip surface treatment device according to claim 1, further comprising a vacuum-pumping assembly and a dust collecting assembly, wherein the vacuum-pumping assembly is disposed corresponding to gaps of the first pair of brush rollers and the second pair of brush rollers, respectively, and the dust collecting assembly is connected to the vacuum-pumping assembly.
7. The device for treating the surface of the lithium metal strip according to claim 1, further comprising a positive pressure gas input assembly, wherein a dryer and/or an inert gas storage tank is connected to the positive pressure gas input assembly.
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| CN202022419136.XU CN214603663U (en) | 2020-10-27 | 2020-10-27 | Surface treatment device for metal lithium strip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112157557A (en) * | 2020-10-27 | 2021-01-01 | 湖南立方新能源科技有限责任公司 | Surface treatment device and surface treatment method for metal lithium belt and lithium metal battery |
| CN116371701A (en) * | 2023-04-26 | 2023-07-04 | 蜂巢能源科技股份有限公司 | Process and device for pre-oiling lithium calendering |
-
2020
- 2020-10-27 CN CN202022419136.XU patent/CN214603663U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112157557A (en) * | 2020-10-27 | 2021-01-01 | 湖南立方新能源科技有限责任公司 | Surface treatment device and surface treatment method for metal lithium belt and lithium metal battery |
| CN116371701A (en) * | 2023-04-26 | 2023-07-04 | 蜂巢能源科技股份有限公司 | Process and device for pre-oiling lithium calendering |
| CN116371701B (en) * | 2023-04-26 | 2024-03-22 | 蜂巢能源科技股份有限公司 | Process and device for pre-oiling lithium calendering |
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Denomination of utility model: A metal lithium strip surface treatment device Granted publication date: 20211105 Pledgee: Agricultural Bank of China Limited Zhuzhou branch Pledgor: HUNAN LIFANG NEW ENERGY SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2024980042821 |