CN211645374U - Microporous film surface deposition device, microporous film and secondary battery - Google Patents
Microporous film surface deposition device, microporous film and secondary battery Download PDFInfo
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- CN211645374U CN211645374U CN201921720333.6U CN201921720333U CN211645374U CN 211645374 U CN211645374 U CN 211645374U CN 201921720333 U CN201921720333 U CN 201921720333U CN 211645374 U CN211645374 U CN 211645374U
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Abstract
The application discloses micropore film surface deposition device relates to the diaphragm field of making for secondary cell. This application is through dividing a plurality of different regions in the box to let in specific gas in different regions, make the micropore film pass the removal in-process of box, first breather pipe ventilate simultaneously to the different parts on micropore film surface, can realize a continuous, efficient ALD mode of handling.
Description
Technical Field
The application relates to the field of manufacturing of diaphragms for secondary batteries, in particular to a microporous film surface deposition device, a microporous film and a secondary battery.
Background
At present, a secondary battery system adopting liquid electrolyte, such as a lithium ion battery and the like, needs to adopt a diaphragm material to separate a positive electrode and a negative electrode, so as to avoid short circuit. The diaphragm material mainly comprises a polymer film or non-woven fabric which is made of high polymer materials such as Polyethylene (PE), polypropylene (PP), Polytetrafluoroethylene (PTFE) and the like and contains a microporous structure. The electrolyte exists in the microporous structure, and the conduction of ions between the positive electrode and the negative electrode is realized.
In order to improve the heat resistance and the electrochemical performance of the diaphragm material, most of the PP/PE microporous membranes are coated with oxide particles to form a ceramic layer, and the ceramic layer is improved to a certain extent, but the thickness of the coated ceramic layer is generally 1-4um, and the problems of adhesion between inorganic micro-nano particles and a diaphragm polymer, agglomeration of micro-nano particles and maintenance of diaphragm porosity are mostly involved, so that the technical defects which cannot be avoided exist,
in order to overcome the defects, a method for depositing oxide on the surface of the diaphragm by a deposition mode is provided. For example, chinese patent application publication No. CN106960933A discloses a "separator for a secondary battery having excellent heat resistance and shutdown characteristics", in which a heat-resistant coating layer is formed on at least one surface of a polymer base material by an Atomic Layer Deposition (ALD) method, thereby overcoming the defects of a coating process, improving the heat resistance and shutdown characteristics of the separator, and improving the safety of the battery. However, in this solution, the substrate is processed by the existing ALD apparatus, and different gas phase precursors are alternately introduced into the reactor to perform chemical adsorption and reaction on the substrate to form a deposited film, i.e. the substrate needs to be atomically deposited many times to form a uniform and stable heat-resistant coating. Therefore, the prior art lacks a deposition device specially applied to microporous film materials, and can not perform continuous and efficient deposition treatment.
Disclosure of Invention
The purpose of the application is to provide a microporous film surface deposition device and a method, which are used for depositing oxide on the surface of a diaphragm material for a secondary battery.
In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: a microporous thin film surface deposition apparatus comprising: the box body is provided with a plurality of first areas and a plurality of second areas, and the first areas and the second areas are alternately arranged; a plurality of breather pipes, this breather pipe evenly distributed is in the top of microporous film, and the breather pipe inserts the box, and the air supply is connected to the breather pipe, and the breather pipe is used for ventilating to microporous film surface, and the breather pipe includes: the first breather pipe is arranged in the first area and used for introducing first reaction gas into the box body; and the second vent pipe is arranged in the second area and is used for introducing second reaction gas into the box body.
In the technical scheme, the plurality of different areas are divided in the box body, and specific gas is introduced into the different areas, so that the microporous film can simultaneously ventilate different parts of the surface of the microporous film by the first ventilating pipe and the first ventilating pipe in the moving process of penetrating through the box body, and the ALD cycle can be realized for multiple times.
Further, according to the embodiment of the application, the box body further comprises a plurality of third areas, and the third areas are arranged between any pair of the first areas and the second areas.
Further, according to this application embodiment, wherein, above-mentioned breather pipe still includes the third breather pipe, and the third breather pipe sets up in the third region, and the third breather pipe is used for letting in non-reacting gas to the box.
Further, according to the embodiment of the present application, wherein the distance between the vent pipe and the surface of the microporous film is 0.2-2 cm.
Further, according to this application embodiment, wherein, the box still includes infrared heating device, and this infrared heating device heats the box inside, guarantees the reaction temperature of first reactant gas and second reactant gas in the box.
Further, according to the embodiment of the present application, wherein, the box further includes: an inlet provided at a side of the case for introducing the microporous membrane into the case; and the outlet is arranged on the other side surface of the box body, the outlet is arranged opposite to the inlet, and the outlet is used for leading the microporous film out of the box body.
Further in accordance with an embodiment of the present application, wherein the inlet comprises a first pinch roller for pinching the microporous film.
Further in accordance with an embodiment of the present application, wherein the outlet comprises a second pinch roller for pinching the microporous film.
Further, according to the embodiment of the present application, wherein the microporous film surface deposition apparatus further comprises a suction device disposed below the microporous film, the suction device is configured to suck the gas in the tank out of the tank.
Further, according to an embodiment of the present application, wherein, the above-mentioned suction device includes: the air suction pipe is aligned to the surface of the microporous film and used for absorbing the gas passing through the pores on the microporous film, and the air suction pipe passes through the box body; and the air suction pump is arranged outside the box body and is connected with the air suction pipe.
Further, according to the embodiment of the present application, wherein the distance between the suction pipe and the surface of the microporous membrane is 0.2-2 cm.
Further, according to the embodiment of the present application, an end of the air intake pipe is in a shape of a horn.
Further, according to the embodiment of the present application, wherein the apparatus for depositing a microporous film surface further comprises a vacuum pumping device, the vacuum pumping device is connected to the box.
In addition, the embodiment of the application also provides another technical scheme: a microporous film surface deposition method comprising: and in the moving process of the microporous film passing through the box body, alternately introducing a first reaction gas and a second reaction gas into the surface of the microporous film in a plurality of areas, so that the first reaction gas and the second reaction gas react on the surface of the micropores and form a deposition layer.
In the above technical solution, the embodiments of the present application provide
Further, according to the embodiment of the present application, wherein the first reaction gas is a metal compound vapor.
Further in accordance with an embodiment of the present application, wherein the metal compound vapor includes a metal compound of at least one metal selected from the group consisting of aluminum, calcium, magnesium silicon, titanium, and zirconium.
Further, according to the embodiment of the present application, wherein the metal compound vapor is Trimethylaluminum (TMA).
Further, according to the embodiment of the present application, wherein the second reaction gas is a vapor of a non-metallic compound.
Further in accordance with an embodiment of the present application, wherein the second reactive gas comprises a non-metallic compound selected from at least one of carbon, nitrogen, sulfur, and oxygen.
Further, according to the embodiment of the present application, wherein the second reactive gas is water vapor.
Further, according to the embodiment of the present application, wherein a non-reactive gas is introduced to the surface of the microporous membrane between any one of the sets of the first reactive gas and the second reactive gas.
Further, according to the embodiment of the present application, wherein the non-reactive gas is an inert gas.
Further, according to the embodiment of the present application, wherein the non-reactive gas is nitrogen.
Further, according to an embodiment of the present application, wherein the ventilation amount of the first reactive gas or the second reactive gas in any one of the zones is controlled by adjusting the width of the zone.
Further, according to an embodiment of the present application, wherein the ventilation amount of the non-reactive gas in any one of the zones is controlled by adjusting the width of the zone.
Further, according to the embodiment of the present application, wherein the moving speed of the microporous film is 10 m/min to 120 m/min.
Further, according to the embodiment of the present application, while the first reactive gas and the second reactive gas are introduced into the microporous film, the excess unreacted first reactive gas and the second reactive gas are discharged out of the chamber through the gas suction device below the microporous film.
Further, according to the embodiment of the application, wherein the vacuum environment is maintained in the box body, and the vacuum degree is 10-7mTorr (millitorr) -100 Torr.
Secondly, the embodiment of the application also discloses a microporous film which is prepared by adopting the microporous film surface deposition method.
Finally, the embodiment of the application also discloses a secondary battery which is provided with the microporous film.
Compared with the prior art, the method has the following technical effects: this application embodiment is through dividing a plurality of different regions in the box to let in specific gas in different regions, make the micropore film pass the removal in-process of box, first breather pipe ventilate simultaneously to the different parts on micropore film surface, can realize a continuous, efficient ALD mode of treatment.
Drawings
The present application is further described below with reference to the drawings and examples.
FIG. 1 is a schematic structural diagram of a microporous thin film surface deposition apparatus according to the present application.
Fig. 2 is a partial sectional view of fig. 1.
Fig. 3 is a schematic diagram of region division in the present application.
In the attached drawings
1. Breather pipe 2, box 3, micropore film
4. Guide shaft 5, air suction pipe 6 and air suction pump
7. Vacuumizing device 8, air source 9 and infrared heating device
10. Pinch roller 11, trumpet port 12, first area
13. Second region 14, third region
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
As shown in fig. 1 to 3, the present application discloses a microporous thin film surface deposition apparatus for depositing an oxide on a surface of a separator material for a secondary battery by an Atomic Layer Deposition (ALD) method, mainly comprising: a box 2, this box 2 is the rectangle, and the both ends of box 2 are provided with entry and export, and entry and export are rectangular shape, set up in the middle part at box 2 both ends, and the size of entry and export and the thickness and the width of microporous film 3 are to the adaptation, make microporous film 3 can pass from the middle part of box 2, divide into two parts from top to bottom with box 2. Specifically, on both sides of the case 2, guide shafts 4 are provided for introducing or extracting the microporous film 3 into or from the case 2.
The case 2 has a plurality of first areas 12 and second areas 13, and the first areas 12 and the second areas 13 may be divided by actual partitions or may be virtually divided, and the arrangement is not limited to the present application. The first areas 12 and the second areas 13 are alternately arranged in the box body 2, and the sequence between the single first areas and the single second areas is not limited. Between any set of first and second regions, a third region 14 is provided. Specifically, as in the present embodiment, a first portion of the microporous film 3 after entering the box body 2 is divided into a first area, a third area is set behind the first area, a second area is set behind the third area, another third area is set behind the second area, and so on until the internal space of the box body 2 is completely divided.
In the microporous film deposition apparatus disclosed in the present application, still include a plurality of breather pipes 1, the even cartridge of these a plurality of breather pipes 1 is in the top of box 2, makes the mouth of pipe of breather pipe 1 aim at the upper surface and the evenly distributed of microporous film 3, and breather pipe 1 connects air supply 8. The aeration pipes distributed in the first area 12 are first aeration pipes, and the first aeration pipes introduce first reaction gas to the surface of part of the microporous film in the first area 12; the vent pipes distributed in the second area 13 are second vent pipes, and the second vent pipes introduce second reaction gas to the surface of the part of the microporous film in the second area 13; the vent pipes distributed in the third area 14 are third vent pipes, and the third vent pipes introduce non-reactive gas to the surface of part of the microporous film in the third area 14.
In the above technical scheme, in the embodiment of the present application, a plurality of different regions are divided in the box body 2, and specific gas is introduced into the different regions, so that in the moving process of the microporous film 3 through the box body, the first vent pipe and the third vent pipe simultaneously ventilate different parts of the surface of the microporous film 3, and multiple ALD circulation can be realized.
Specifically, as in the present embodiment, for any part of the surface of the microporous membrane, during the movement of the microporous membrane, when the microporous membrane passes through one of the first regions, the first reactive gas is received and a monolayer is formed on the part of the surface of the microporous membrane; then entering a third area adjacent to the first area, and purging the part of the surface of the microporous membrane by a non-reactive gas; then, entering a second area adjacent to the third area, and receiving a second reaction gas, wherein the second reaction gas reacts with the first monolayer deposited on the surface of the given part of the microporous film to form a deposition layer; and finally, entering another third area adjacent to the second area, and receiving the non-reaction gas for purging, so as to finish an ALD cycle, and the like until the part of the microporous film passes through the box body. In the process that the whole microporous film passes through the box body, any part of the surface of the microporous film can form a deposition layer with a specified thickness through multiple times of deposition, purging, reaction of the second reaction gas and re-purging of the first reaction gas, so that a continuous and efficient ALD treatment mode can be realized by using the microporous film surface deposition device.
In the technical scheme, the distance between the vent pipe 1 and the surface of the microporous film 3 is 0.2-2cm, so that higher deposition efficiency can be ensured.
In the above technical scheme, the infrared heating device 9 is arranged in the box body to heat the interior of the box body 2, so that the reaction temperature in the box body 2 is ensured. In the present application, the temperature inside the chamber 2 is determined according to the reaction temperature of the first reaction gas, while taking into consideration a temperature range in which damage to the substrate can be avoided. In order to improve the deposition efficiency, it is preferable to perform at the highest temperature from the aforementioned viewpoint. In addition, the temperature of the gas introduced into the box body is kept consistent with that in the box body.
In the above technical solution, the inlet and outlet at two ends of the box body 2 are respectively provided with the pinch rollers 10, the first pinch roller is positioned at the inlet, the second pinch roller is positioned at the outlet, and the first pinch roller and the second pinch roller are used for clamping the microporous film.
In the microporous film surface deposition device disclosed by the application, a suction device is arranged below the microporous film 3 and used for discharging the excessive other materials which are not deposited or reacted in the box body out of the box body. Specifically, the suction device includes a suction pipe 5 and a suction pump 6. The air suction pump 6 is arranged below the box body and connected with the air suction pipe 5 to provide suction force for the air suction pipe 5 to absorb air. The air suction pipe 5 is inserted at the bottom of the box body 2, the pipe orifice is aligned with the microporous film 3 and absorbs the air passing through the pores of the microporous film 3, and the distance between the air suction pipe 5 and the lower surface of the microporous film 3 is 0.2-2 cm. The end of the suction pipe 5 is formed in a horn shape so as to cover the entire lower surface of the microporous membrane 3 in the casing as much as possible. In the embodiment of the present application, only one suction pipe 5 is provided, and the lower surface of the microporous film 3 is covered by the trumpet-shaped port 11, but a plurality of suction pipes may be provided, each suction pipe corresponding to a plurality of first regions, second regions, and third regions one-to-one, respectively absorbing the redundant gas in the above regions, and each suction pipe having a trumpet-shaped port for covering the lower surface of the microporous film in a single region. Therefore, the arrangement of the air suction pipe is not limited to the present application.
In the microporous film surface deposition device disclosed by the application, a vacuumizing device 7 is further arranged, and the vacuumizing device 7 is connected with the box body 2, so that a vacuum environment is kept in the box body 2.
The application also discloses a method for depositing the surface of the microporous film, namely, in the moving process of the microporous film passing through the box body, the first reaction gas and the second reaction gas are alternately introduced to the surface of the microporous film in a plurality of areas, so that the first reaction gas and the second reaction gas react on the surface of the microporous film and form a deposition layer. Specifically, in the embodiment of the present application, a plurality of first regions and second regions are divided in a box body, the first regions and the second regions are alternately arranged, and a first reactive gas and a second reactive gas are respectively introduced into the first regions and the second regions, so that multiple ALD cycles can be realized in the moving process of the microporous film.
In the above technical solution, the first reaction gas is a metal compound vapor, and specifically includes at least one non-metal compound selected from carbon, nitrogen, sulfur and oxygen, preferably Trimethylaluminum (TMA).
In the above technical solution, the second reaction gas is a non-metal compound vapor, specifically including at least one non-metal compound selected from carbon, nitrogen, sulfur and oxygen, and preferably water vapor (H)2O)。
In the microporous film surface deposition method disclosed by the application, a non-reactive gas is introduced between any one group of the first reactive gas and the second reactive gas to the microporous film surface. The non-reactive gas is an inert gas, preferably nitrogen (N)2). And the non-reaction gas purges the surface of the microporous membrane, and removes the excess un-deposited first reaction gas and the excess un-reacted second reaction gas.
In a microporous thin film surface deposition method disclosed in the present application, the amount of ventilation of a first reactive gas, a second reactive gas, or a non-reactive gas is controlled by adjusting the width of each ventilation area. Specifically, in the embodiments of the present application, the width of the venting region may be adjusted according to the requirements of the ALD process. For example, if TMA is directly introduced into the aeration region at the inlet, the distance between the regions can be appropriately reduced due to the problem of a smaller number of hydroxyl groups on the surface of the membrane; if water is introduced first, the spacing of the regions can be enlarged. On the other hand, if water is introduced into another aeration region adjacent to the above region, the space between the regions and the amount of air taken in need to be increased due to the surface tension of water and the micropores in the membrane surface.
In a method for depositing a microporous film on a surface, the moving speed of the microporous film is 10 m/min to 120 m/min. For the method for depositing the surface of the microporous film in the embodiment of the present application, the moving speed of the microporous film in the box body also affects the thickness of the surface deposition layer, and ultimately affects the deposition efficiency. Therefore, the moving speed of the microporous film is related to the deposition thickness required by the process and the ventilation of the reaction gas, and the moving speed of the microporous film can be controlled within the range of 10 m/min to 120 m/min according to the deposition thickness required by the process and the ventilation of the reaction gas in the specific operation process of the technical personnel.
In a method for depositing a microporous film surface disclosed in the present application, excess undeposited or reacted gas is discharged from a chamber below a microporous film while venting air to the upper surface of the microporous film.
In the microporous film surface deposition method disclosed by the application, a vacuum environment is kept in a box body, and the vacuum degree is 10-7mTorr (millitorr) -100 Torr.
In the application, the microporous film can be prepared for a secondary battery by the microporous film surface deposition device and the microporous film surface deposition method, and the microporous film surface is deposited with a layer of oxide with uniform thickness, so that the heat resistance and the electrochemical performance of the microporous film can be improved.
Compared with the prior art, the microporous film surface deposition device and the microporous film surface deposition method disclosed by the application provide a continuous and efficient ALD treatment mode. In the prior art, due to the fact that ALD (atomic layer deposition) circulation needs to be carried out on the surface of the microporous film for multiple times, the carried treatment process is discontinuous and repeated, in the application, ALD circulation can be carried out for multiple times in the moving process of the microporous film, and the efficiency of the deposition process on the surface of the microporous film is greatly improved. In addition, because the microporous film generally has a high aspect ratio, the deposition process in the prior art cannot be used for large-scale mass production, and the length of the microporous film is limited due to equipment reasons.
Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.
Claims (15)
1. A microporous film surface deposition apparatus, comprising:
the microporous membrane penetrates through the middle part of the box body, the box body is provided with a plurality of first areas and a plurality of second areas, and the first areas and the second areas are alternately arranged;
a plurality of breather pipes, breather pipe evenly distributed is in the top of micropore film, the breather pipe inserts the box, the breather pipe is used for connecting the air supply and to the micropore film surface is ventilated, the breather pipe includes:
the first breather pipe is arranged in the first area and is used for introducing first reaction gas into the box body;
and the second vent pipe is arranged in the second area and is used for introducing second reaction gas into the box body.
2. The microporous membrane surface deposition apparatus of claim 1, wherein the housing further comprises:
a plurality of third regions disposed between any pair of the first and second regions.
3. The microporous film surface deposition apparatus of claim 2, wherein the breather tube further comprises: and the third air passing pipe is arranged in the third area and is used for introducing non-reaction gas into the box body.
4. A microporous membrane surface deposition apparatus according to any of claims 1-3, wherein the distance between the breather pipe and the microporous membrane surface is 0.2-2 cm.
5. The microporous membrane surface deposition apparatus of claim 1, wherein the housing further comprises:
and the infrared heating device heats the interior of the box body and ensures the reaction temperature of the first reaction gas and the second reaction gas in the box body.
6. The microporous membrane surface deposition apparatus of claim 1, wherein the housing further comprises:
an inlet provided at a side of the case, the inlet for introducing the microporous membrane into the case;
and the outlet is arranged on the other side surface of the box body, the outlet is arranged opposite to the inlet, and the outlet is used for leading the microporous film out of the box body.
7. The microporous membrane surface deposition apparatus of claim 6, wherein the inlet comprises:
a first pinch roller for pinching the microporous film.
8. The microporous membrane surface deposition apparatus of claim 6, wherein the outlet comprises:
a second pinch roller for pinching the microporous film.
9. The microporous film surface deposition apparatus of claim 1, further comprising:
and the air suction device is arranged below the microporous film and is used for sucking the gas in the box body out of the box body.
10. The microporous film surface deposition apparatus of claim 9, wherein the getter device comprises:
the air suction pipe is aligned to the surface of the microporous membrane and used for absorbing the gas passing through the pores on the microporous membrane, and the air suction pipe is inserted into the box body;
the air suction pump is arranged outside the box body and is connected with the air suction pipe.
11. The microporous membrane surface deposition apparatus of claim 10, wherein the distance between the suction pipe and the microporous membrane surface is 0.2-2 cm.
12. The microporous film surface deposition apparatus of claim 10, wherein the end of the suction pipe is flared.
13. The microporous film surface deposition apparatus of claim 1, further comprising:
and the vacuumizing device is connected with the box body.
14. A microporous film produced by surface deposition of a microporous film according to any one of claims 1 to 13.
15. A secondary battery having a microporous film according to claim 14.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110791748A (en) * | 2019-10-15 | 2020-02-14 | 江苏卓高新材料科技有限公司 | Microporous film surface deposition device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110791748A (en) * | 2019-10-15 | 2020-02-14 | 江苏卓高新材料科技有限公司 | Microporous film surface deposition device and method |
| CN110791748B (en) * | 2019-10-15 | 2024-05-28 | 江苏卓高新材料科技有限公司 | Microporous film surface deposition device and method |
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