CN212434665U - Wide-width ultrathin lithium foil and equipment for preparing wide-width ultrathin lithium foil - Google Patents
Wide-width ultrathin lithium foil and equipment for preparing wide-width ultrathin lithium foil Download PDFInfo
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- CN212434665U CN212434665U CN202021467711.7U CN202021467711U CN212434665U CN 212434665 U CN212434665 U CN 212434665U CN 202021467711 U CN202021467711 U CN 202021467711U CN 212434665 U CN212434665 U CN 212434665U
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Abstract
The utility model provides a wide ultra-thin lithium paper tinsel and be used for preparing its equipment. The wide ultra-thin lithium foil includes a support layer and an ultra-thin lithium layer compounded on one surface of the support layer, the ultra-thin lithium layer being a full-thickness lithium metal layer having a width of 200-.
Description
Technical Field
The utility model relates to a technical field is made to the battery, especially relates to a concatenation method and equipment that is used for ultra-thin lithium foil or lithium area of lithium cell.
Background
The lithium battery is widely applied to the fields of aerospace, computers, mobile communication equipment, robots, electric automobiles and the like due to the advantages of high energy density, long cycle life and wide applicable temperature range. With the development of society and the progress of science and technology, the requirements on the energy density and the cycle life of a lithium battery are higher and higher, but the lithium ion battery which only uses graphite as a negative electrode at present cannot meet the social expectation, so that the development of a novel positive and negative electrode material with higher specific capacity is needed. For the negative electrode material, the pre-lithiation work can effectively improve the specific energy of the battery and prolong the service life of the battery. Lithium metal has a high specific capacity (3860mAh/g, 10 times that of graphite negative electrodes) and the lowest redox potential (-3.04V VS standard hydrogen potential). The method has the advantages that the lithium metal is adopted to carry out pre-lithiation treatment on the traditional graphite cathode, so that on one hand, the first coulomb efficiency of the battery can be improved, the specific energy of the battery is increased, and on the other hand, the cycle life of the battery can be effectively prolonged, so that the lithium ion battery has a wider application field.
The coating width of the negative electrode of the conventional lithium battery is generally between 200 and 1000mm, and the production of the metal lithium strip with the width is extremely difficult, especially the ultrathin metal lithium strip with the thickness of 2-100 mu m. When the narrow lithium band is used for carrying out pre-lithiation on the negative electrode, a plurality of metal lithium bands are required to be compounded to meet the lithium supplement requirement, so that the production efficiency of the lithium battery negative electrode pre-lithiation process link is reduced. Therefore, the utility model provides an ultra-thin lithium foil lithium area concatenation method, this method is through with many ultra-thin lithium foil lithium areas through the mode adhesion of pressure complex to new year layer on to realized splicing into the broad width lithium area with the narrow width lithium area, satisfied the lithium ion battery negative pole and lithiated required width in advance, effectively improve the negative pole and lithiate efficiency in advance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ultra-thin lithium paper tinsel of broad width and preparation method and equipment thereof, wherein splice into broad width lithium area with the narrow width lithium area to satisfy the lithium ion battery negative pole and lithiate the demand in advance to broad width lithium area.
The purpose of the utility model can be realized by the following technical scheme.
An aspect of the present invention is to provide a wide ultra-thin lithium foil, which comprises a carrier layer and an ultra-thin lithium layer combined on a surface of the carrier layer, wherein the ultra-thin lithium layer is a whole metal lithium layer having a width of 200-100 mm, a uniform thickness within a range of 2-100 μm, and no wrinkles or surface defects.
Optionally, the thickness of the ultra-thin lithium layer is 50 μm or less, such as 30 microns or less, 20 microns or less, 10 microns or less, or 4-5 microns.
Alternatively, the thickness of the wide ultra-thin lithium foil (the spliced ultra-thin lithium foil) may be in the range of 5 to 100 μm, preferably 10 to 50 μm, and more preferably 10 to 20 μm.
Optionally, the support layer is selected from: polymeric films or release films made from polymers: for example, high-strength filmed polyolefins (polyethylene, polypropylene, polystyrene), polyester films, and the like; inorganic oxide(s): such as alumina; inorganic conductor: such as graphite, carbon nanotubes, graphene; a metal current collector: such as copper, aluminum; the supporting layer is a single layer or a multi-layer composite.
Optionally, the wide ultrathin lithium foil is formed by splicing a plurality of narrow ultrathin lithium foils with the widths of less than 200mm and the thicknesses of less than 100 μm and compounding the narrow ultrathin lithium foils with a carrying layer under pressure.
Optionally, the narrow-width ultrathin lithium foil is an ultrathin lithium foil with a membrane support.
Optionally, the ultra-thin lithium foil in the membrane-supported ultra-thin lithium foil has a thickness of 30 microns or less, such as 20 microns or less, 10 microns or less, or 4-5 microns.
Optionally, the support film in the ultrathin lithium foil with film support is a polymer film or a release film made of a polymer, such as a high-strength thinned polyolefin (polyethylene, polypropylene, polystyrene), a polyester film, and the like.
Alternatively, the ultra-thin lithium foil may be a uniform continuous strip or a strip with spaces.
Optionally, the ultra-thin lithium foil is a non-uniform tape.
Alternatively, the original width of the membrane-supported ultra-thin lithium foil may be in the range of 10-150mm, preferably 50-150 mm;
another aspect of the present invention is directed to provide an apparatus for preparing a wide ultra-thin lithium foil, the apparatus comprising: (1) unreeling unit, including: at least two unwinding assemblies for ultra-thin lithium foil, wherein the ultra-thin lithium foil is supported by a membrane; the unwinding detection sensor is used for detecting whether the ultrathin lithium foil deviates in real time; the deviation rectifying treatment is carried out on the deflected ultrathin lithium foil so as to ensure that the edge/center of the uncoiled ultrathin lithium foil is neat and consistent; and an unwinding assembly for the carrier layer; (2) a roll unit located downstream of the unwinding unit, comprising: a rolling mill; and (3) a take-up unit downstream of the rolling unit, comprising: at least two winding assemblies for supporting the winding of the film; and the winding assembly is used for winding the spliced ultrathin lithium foil.
Optionally, the winding unit further comprises a winding detection sensor and a winding deviation rectifying assembly.
Optionally, the type of the deviation rectifying assembly is unwinding/winding deviation rectifying or process deviation rectifying.
Optionally, at least one of the unwinding assembly and the winding assembly further comprises a tension control assembly.
The technical scheme of the utility model one of following advantage has at least:
1. the narrow-width ultrathin lithium foil can be changed into a wide-width ultrathin lithium foil, and the width range is wide;
2. the process is simple and suitable for roll-to-roll rapid production.
3. The equipment structure is simple and easy to implement, and can be produced rapidly in batches.
Drawings
Fig. 1 is a schematic diagram of the ultra-thin lithium foil splicing process of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic diagram of the lithium ribbon splicing process of the present invention.
Fig. 4 is a top view of fig. 3.
Fig. 5 is a front view of a splicing device of the present invention.
Description of the figure numbers:
PL 11 tape film supported ultra-thin lithium foil PL 22 tape film supported ultra-thin lithium foil P0 carrier layer
Ultrathin lithium foil spliced by 20-rolling mill P1 support film 1P 2 support film 2 PL
Lithium tape No. L11 lithium tape No. L22 lithium tape P.1 upside release film P.2 downside release film
L-spliced lithium belt 10 unreeling assembly 11 unreeling deviation correcting assembly 12 unreeling supporting roller
13 unreel and detect sensor 30 rolling subassembly 31 rolling backing roll 32 rolling rectifying assembly
33 rolling detection sensor
Detailed Description
The following describes a specific embodiment of the present invention. It is to be understood that other various embodiments can be devised and modified by those skilled in the art in light of the teachings of this disclosure without departing from the scope or spirit of the invention. The following detailed description is, therefore, not to be taken in a limiting sense.
In the description of the present invention, it should be understood that the terms "upper side", "lower side", "number 1", "number 2", etc. are merely for convenience of description and to simplify the description, and thus should not be construed as limiting the present invention.
The utility model provides an ultra-thin lithium paper tinsel concatenation method, include: providing at least two ultrathin lithium foils with membrane supports, wherein each ultrathin lithium foil with membrane supports consists of a support membrane and an ultrathin lithium foil and is provided with a bare lithium surface and a bare membrane surface opposite to the bare lithium surface; unwinding the ultrathin lithium foil with the membrane support, and then tiling the ultrathin lithium foil side by side, wherein the bare lithium surface of the ultrathin lithium foil with the membrane support faces to the same surface; providing a support layer, wherein the adhesion force of the support layer to lithium is larger than the adhesion force of a support film to lithium, and the width of the support layer is larger than or equal to the total width of the ultrathin lithium foil supported by the film; the bare lithium surface of the ultrathin lithium foil with the membrane support is arranged opposite to the carrying layer, and rolling is carried out by using a rolling mill, so that a plurality of ultrathin lithium foils are transferred to the carrying layer from the support membrane, and the splicing of the ultrathin lithium foils is realized.
Specific embodiments of the method for splicing the ultra-thin lithium foil are described below with reference to the accompanying drawings.
In this embodiment, two ultrathin lithium foils supported by a film are spliced as an example, and in other embodiments, two or more ultrathin lithium foils can be spliced. In the embodiment, the width of the selected ultrathin lithium foil with the membrane support is 100mm, the thickness of the support membrane is 60 μm, and the thickness of the ultrathin lithium foil is 10 μm; the diameter of the roll using the rolling mill may be
The supporting layer is a copper foil with a thickness of 10 μm.
Referring to fig. 1 and 2, placing the ultra-thin lithium foil PL1 supported by the tape film No. 1 and the ultra-thin lithium foil PL2 supported by the tape film No. 2 on an unwinding assembly respectively for unwinding, and ensuring that two ultra-thin lithium foils (PL1 and PL2) supported by the tape film are laid side by side; the bare lithium side on both of the membrane-supported ultrathin lithium foils was oriented to the side of the support layer P0. As shown in fig. 2, the spread ultra-thin lithium foil PL1 supported by tape film No. 1 and PL2 supported by tape film No. 2 were aligned in edge alignment and rolled in a rolling mill together with the carrier layer P0. The rolling gap of the rolling mill is kept at 75-80 μm, the pressure is 3-5 tons, and after rolling by the rolling mill, the ultrathin lithium foil on the ultrathin lithium foil PL1 supported by No. 1 tape film and the ultrathin lithium foil PL2 supported by No. 2 tape film are compounded on the supporting layer P0. At the outlet end of the rolling mill, separating the ultrathin lithium foil PL1 supported by the No. 1 belt film and the ultrathin lithium foil PL2 supported by the No. 2 belt film from the supporting layer P0, wherein the ultrathin lithium foil is adhered to the supporting layer P0, and the two ultrathin lithium foils are spliced to form a new spliced ultrathin lithium foil PL supported by the supporting layer P0; the original membrane-supported ultra-thin lithium foil only remained the supported membranes P1 and P2.
Through a large number of experiments of the inventor, the splicing method can successfully finish the splicing of the ultrathin lithium foil by adopting a rolling mill with any roll diameter; the smaller the roll diameter of the rolling mill used, the smaller the rolling pressure required.
The utility model also provides a lithium area concatenation method, include: providing at least two lithium belts, and paving the lithium belts side by side after unreeling; providing anti-sticking layers, wherein the anti-sticking layers are arranged on two sides of the lithium belt, and the width of each anti-sticking layer is larger than the total width of the lithium belt; and (3) rolling the adjacent lithium strips in a rolling mill by keeping the gap between the adjacent lithium strips smaller than zero, so that a plurality of lithium strips are compounded into one lithium strip to complete the splicing of the lithium strips.
Specific examples of the lithium ribbon splicing method will be described in detail below with reference to the accompanying drawings.
In this example, a lithium strip with a thickness of 0.1mm and a width of 100mm is selected; rolling mill rolls of diameter
The release layer is selected from a film material, such as a polypropylene film.
Referring to fig. 3 and 4, the lithium tape No. 1L 1 and the lithium tape No. 2L 2 are respectively placed on the unwinding assembly for unwinding, and it is ensured that two lithium tapes (L1 and L2) are laid side by side, and the two lithium tapes have a small overlap, and the width of the overlap (overlap) is controlled within 0.2-1 mm. The upper and lower release films p.1 and p.2 are respectively disposed above and below the lithium tapes L1 and L2 to be unreeled. The upper release film p.1, the spread lithium tapes (L1 and L2), and the lower release film p.2 are rolled together in 3 layers into a rolling mill 20. The pressure of the rolling mill is 5-10 tons, after rolling by the rolling mill 20, the overlapped parts of the No. 1 lithium belt L1 and the No. 2 lithium belt L2 are connected into a whole, and the thickness of the lithium belt is consistent with that of the lithium belt at the part which is not overlapped at the two sides. And (3) winding and rolling the upper anti-sticking film P.1 and the lower anti-sticking film P.2 respectively at the outlet end of the rolling mill 20, splicing the lithium strip L after the middle part is spliced, and rolling the lithium strip L independently, wherein the spliced lithium strip L has the same thickness.
In certain embodiments, the size of the overlapping portions of adjacent lithium strips may be 0.1-10mm, preferably 0.2-2 mm.
In certain embodiments, the release layer may be a polymer or inorganic oxide that is coated/coated on the roll as part of the roll.
In some embodiments, the release layer may also be an ester, which may be coated on the roll.
The utility model also provides an equipment for concatenation, include: a rolling mill; unreel subassembly and rolling subassembly.
The following describes a specific embodiment of the splicing apparatus of the present invention with reference to the drawings.
The splicing apparatus in this embodiment is described by taking an example of splicing two ultrathin lithium foils supported by a film. Referring to fig. 5, the splicing apparatus mainly includes an unwinding assembly 10, a rolling mill 20, and a winding assembly 30.
In this embodiment, the unwinding assembly 10 includes two unwinding assemblies 10.1 and 10.2 for unwinding the ultra-thin lithium foil supported by the tape film and an unwinding assembly 10.3 for unwinding the carrier layer. Optionally, the unwinding assembly 10 further includes a deviation rectifying assembly 11, an unwinding support roller 12, and an unwinding detection sensor 13. The unreeling component 30 comprises two reeling components 30.1 and 30.2 for reeling a support film and a reeling component 30.3 for reeling an ultrathin lithium foil after splicing. Optionally, the winding assembly 30 further includes a winding support roller 31, a winding deviation rectifying assembly 32 and a winding detection sensor 33.
The working principle of the splicing device and the splicing method are described in detail with reference to fig. 1, fig. 2 and fig. 5. The No. 1 ultrathin lithium foil PL1 supported by the tape film is fixed to the unwinding assembly 10.1 for unwinding; the No. 2 ultrathin lithium foil PL2 supported by the tape film is fixed to the unwinding assembly 10.2 for unwinding; in addition, in the unreeling process of the two ultrathin lithium foils (PL1 and PL2) with the membrane supports, the unreeling detection sensor 13 detects whether the ultrathin lithium foils are off tracking in real time, if the ultrathin lithium foils are off tracking, the unreeling deviation-correcting assembly 11 is used for correcting deviation, and the edge/center of the unreeled ultrathin lithium foils with the membrane supports is ensured to be neat and consistent. The carrier layer P0 is fixed to the unwinding assembly 10.3 for unwinding. Two ultra-thin lithium foils (PL1 and PL2) with membrane supports are laid side by side and then enter a rolling mill 20 together with two layers of a supporting layer P0 for rolling treatment. After rolling treatment by the rolling mill 20, the ultrathin lithium foils on the No. 1 tape film supported ultrathin lithium foil PL1 and the No. 2 tape film supported ultrathin lithium foil PL2 are adhered to the supporting layer P0 to form spliced ultrathin lithium foil PL; the spliced ultrathin lithium foil PL is subjected to deviation rectification by using a deviation rectification detection sensor 33 and a winding deviation rectification component 32 and then is wound by using a winding component 30.3; the support films separated from the ultra-thin lithium foil supported by the tape films of No. 1 and No. 2 after rolling by the rolling mill 20 are respectively wound by using winding assemblies 30.1 and 30.2.
In the embodiment, the two ultrathin lithium foils supported by the film are spliced, in some embodiments, the unwinding assembly may be two, three or even more, and optionally, the unwinding assembly further includes a deviation rectifying assembly and/or a tension control assembly; in some embodiments, the winding assembly may be two, three or more, and optionally, the winding assembly further includes a deviation correcting assembly and/or a tension control assembly.
Although the present invention has been disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (8)
1. A wide ultra-thin lithium foil is characterized in that,
the wide ultra-thin lithium foil includes a supporting layer and an ultra-thin lithium layer compounded on one surface of the supporting layer,
the ultra-thin lithium layer is a full-thickness metallic lithium layer having a width of 200-.
2. The wide ultra-thin lithium foil as claimed in claim 1, wherein the ultra-thin lithium layer has a thickness of 50 μm or less.
3. The wide ultra-thin lithium foil as claimed in claim 1, wherein the wide ultra-thin lithium foil has a thickness of 5 to 100 μm.
4. The wide ultra-thin lithium foil as claimed in claim 1, wherein the wide ultra-thin lithium foil is formed by laminating a plurality of ultra-thin lithium foils having a width of 200mm or less and a thickness of 100 μm or less, and laminating the laminated lithium foils with a carrier layer.
5. An apparatus for preparing a wide-width ultra-thin lithium foil, the apparatus comprising:
unreeling unit, including:
at least two unwinding assemblies for ultra-thin lithium foil, wherein the ultra-thin lithium foil is supported by a membrane;
the unwinding detection sensor is used for detecting whether the ultrathin lithium foil deviates in real time;
the deviation rectifying treatment is carried out on the deflected ultrathin lithium foil so as to ensure that the edge/center of the uncoiled ultrathin lithium foil is neat and consistent; and
the unwinding assembly is used for supporting the layer;
a roll unit located downstream of the unwinding unit, comprising:
a rolling mill;
a take-up unit downstream of the rolling unit, comprising:
at least two winding assemblies for supporting the winding of the film; and
a rolling subassembly that is used for ultra-thin lithium paper tinsel rolling after the concatenation.
6. The apparatus of claim 5, wherein the take-up unit further comprises a take-up detection sensor and a take-up deviation correction assembly.
7. The apparatus of claim 5 or 6, wherein the deskew module is of the type unreeling/reeling deskew or process deskew.
8. The apparatus of claim 5 or 6, wherein at least one of the unwinding assembly and the winding assembly further comprises a tension control assembly.
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| CN202021467711.7U CN212434665U (en) | 2020-07-23 | 2020-07-23 | Wide-width ultrathin lithium foil and equipment for preparing wide-width ultrathin lithium foil |
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| CN202021467711.7U CN212434665U (en) | 2020-07-23 | 2020-07-23 | Wide-width ultrathin lithium foil and equipment for preparing wide-width ultrathin lithium foil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113732058A (en) * | 2021-08-13 | 2021-12-03 | 奉新赣锋锂业有限公司 | Preparation method of ultra-wide and ultra-thin metal lithium and alloy strip thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113732058A (en) * | 2021-08-13 | 2021-12-03 | 奉新赣锋锂业有限公司 | Preparation method of ultra-wide and ultra-thin metal lithium and alloy strip thereof |
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