Method for manufacturing a unit lithium electrode and method for manufacturing an electrode laminate including the same

Abstract

The present invention relates to a method for manufacturing a unit lithium electrode, which includes cutting a sheet-type lithium metal electrode including a current collector, a lithium metal layer formed on one or both surfaces of the current collector, and a protective film adhered to the surface of the lithium metal layer into the size of the unit lithium electrode, and then removing the protective film with an adhesive film having an adhesive layer formed on one surface of a base film, and a method for manufacturing an electrode laminate including the same.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application claims the benefit of priority based on Korean Patent Application No. 10 - 2022 - 0178485 filed on Dec. 19, 2022, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The present invention relates to a method for manufacturing a unit lithium electrode and a method for manufacturing an electrode laminate including the same.

Background Art

[0003] With the increasing development of technology and demand for mobile devices, the demand for secondary batteries as an energy source has increased rapidly. Among such secondary batteries, lithium secondary batteries that exhibit high energy density, operating potential, long cycle life, and low magnetic discharge rate have been commercialized and widely used.

[0004] Typically, in terms of the shape of the battery, there is a high demand for rectangular secondary batteries and pouch - type secondary batteries that are thin and applicable to products such as mobile phones. In terms of materials, there is a high demand for lithium secondary batteries such as lithium - ion batteries and lithium - ion polymer batteries with high energy density, discharge voltage, and output stability.

[0005] Generally, a lithium secondary battery is configured in a structure in which a non - aqueous electrolyte is impregnated in an electrode assembly composed of a positive electrode, a negative electrode, and a porous separator. Also, generally, the positive electrode is manufactured by coating a positive electrode mixture containing a positive electrode active material on an aluminum foil, and the negative electrode is manufactured by coating a negative electrode mixture containing a negative electrode active material on a copper foil.

[0006] Normally, the positive electrode active material is a lithium transition metal oxide, and the negative electrode active material uses a carbon - based material.

[0007] However, recently, lithium metal batteries that use lithium metal itself, which exhibits high energy density, as a negative electrode active material have been commercialized.

[0008] At this time, the lithium metal used as the negative electrode has a low density (0.54 g / cm 3 ), and also has a very low standard reduction potential (3.045 V SHE). Therefore, it is the most spotlighted material as a negative electrode material for high energy density batteries. Also, despite the problems caused by its very high chemical activity, recently, due to the continuous increase and rapid development in the use of mobile communication and portable electronic devices, the demand for the development of high energy density secondary batteries has been continuously increasing. Therefore, the need for the use of lithium metal negative electrodes has been continuously emerging.

[0009] At this time, when using a lithium metal electrode as the negative electrode, since lithium metal has a very high reactivity, it reacts with moisture in the air to produce by-products such as LiOH, Li2O, Li2CO3, and Li3N. This can significantly reduce the performance of the manufactured battery and may even cause internal short circuits. Also, since lithium is a metal with very low strength, there is also the problem that it is difficult to utilize it immediately as a metal.

[0010] Therefore, when using lithium metal as the negative electrode active material, it is common to incorporate a polymer carrier film such as a PET film into the lithium metal electrode as a protective film. However, nevertheless, since the protective film must be removed before assembling the electrode laminate, it is preferable to remove the protective film as late as possible. However, when cutting together with the protective film to manufacture a unit electrode, the lithium metal and the protective film will adhere to the cut surface together due to the cutting pressure. When removing the protective film before cutting, the problem of the reactivity of lithium metal still remains.

[0011] Therefore, it is necessary to develop a technology that can solve such problems and provide a high-quality unit lithium electrode that can be used in lithium metal batteries. Summary of the Invention Problems to be Solved by the Invention

[0012] An object of the present invention is to provide a method for manufacturing a unit lithium electrode capable of effectively removing a protective film from the lithium electrode after cutting it to the size of the unit lithium electrode.

[0013] Another object of the present invention is to provide a method for manufacturing an electrode laminate using the unit lithium electrode after manufacturing the unit lithium electrode.

Means for Solving the Problems

[0014] A method for manufacturing a unit lithium electrode according to an embodiment of the present invention includes: After cutting a sheet-type lithium metal electrode including a current collector, a lithium metal layer formed on one or both surfaces of the current collector, and a protective film attached to the surface of the lithium metal layer to the size of the unit lithium electrode, removing the protective film with an adhesive film having an adhesive layer formed on one surface of a base film.

[0015] Here, the protective film may be one selected from the group consisting of a polymer film, a polymer electrolyte film, a release film, a vapor deposition film, a metal foil, a glass fiber fabric, and a functional multilayer film.

[0016] The method for manufacturing the unit lithium electrode may further include a tab forming cutting step of forming a tab before, after, or simultaneously with cutting the sheet-type lithium metal electrode to the size of the unit lithium electrode.

[0017] On the other hand, the step of removing the protective film can be performed by a method of contacting the adhesive layer of the adhesive film for removal with the surface of the protective film and then peeling it. At this time, the adhesive layer of the adhesive film for removal may be formed entirely on one surface of the base film, or may be formed in a pattern shape such as a line type or a dot type.

[0018] Furthermore, the method for manufacturing the unit lithium electrode may further include a step of pressing the unit lithium electrode after removing the protective film.

[0019] Here, the pressing can be performed by a pair of pressing rollers.

[0020] According to another embodiment of the present invention, the present invention also provides a method for manufacturing an electrode laminate for a lithium metal battery, the method including preparing a unit lithium electrode by the method for manufacturing the unit lithium electrode, and laminating the unit lithium electrode together with a positive electrode and a separator.

[0021] At this time, the electrode laminate can be a bicell in which the electrodes at both ends have the same polarity, a full cell in which the electrodes at both ends have different polarities, a monocell in which a separator and a unit lithium electrode are laminated, or a laminated electrode assembly in which the positive electrode and the unit lithium electrode are alternately arranged two or more times with a separator therebetween.

Advantages of the Invention

[0022] The method for manufacturing a unit lithium electrode according to the present invention, after cutting with the unit lithium electrode, removes the protective film, and by simply removing the protective film using an adhesive film having an adhesive layer formed on one surface, while minimizing the influence on the lithium metal layer due to the removal of the protective film, the protective film can be maintained for as long as possible, and there is an effect of preventing contamination due to the high reactivity of lithium metal.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0024] The terms and words used in this specification and the claims should not be construed in the ordinary dictionary meaning, and based on the principle that the inventor can appropriately define the concept of the terms in order to explain his invention in the best way, they must be construed in a meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. So, at the time of this application, there can be various equivalents and modifications replacing these, and the scope of the present invention is not limited to the embodiments described below.

[0025] Hereinafter, the present invention will be described in detail with reference to the drawings and embodiments. The terms and words used in this specification and the claims should not be construed limited to the common or dictionary meaning, and based on the principle that the inventor can appropriately define the concept of the terms in order to explain his invention in the best way, they must be construed in a meaning and concept consistent with the technical idea of the present invention.

[0026] Also, hereinafter, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention. So, at the time of this application, it must be understood that there are various equivalents and modifications that can replace these.

[0027] According to an embodiment of the present invention, a method for manufacturing a unit lithium electrode, A method for manufacturing a unit lithium electrode is provided, which includes cutting a sheet-type lithium metal electrode including a current collector, a lithium metal layer formed on one or both surfaces of the current collector, and a protective film attached to the surface of the lithium metal layer into the size of the unit lithium electrode, and then removing the protective film with an adhesive film having an adhesive layer formed on one surface of a base film.

[0028] Hereinafter, for convenience of understanding, the method for manufacturing the unit lithium electrode will be described with reference to the drawings.

[0029] FIG. 1 schematically shows a method for manufacturing such a unit lithium electrode, FIG. 2 shows a cross-sectional view of a sheet-type lithium metal electrode used before manufacturing the unit lithium electrode, and FIGS. 3 and 4 schematically show examples of the adhesive film used for manufacturing the unit lithium electrode of the present invention.

[0030] Referring to these drawings, first, a sheet-type lithium metal electrode 110 is provided to manufacture a unit lithium electrode.

[0031] As described above, in the case of lithium metal, since it is very soft and highly reactive, it is not introduced into the process with the lithium metal layer exposed on the surface. Generally, it is introduced with a protective film attached to the lithium metal layer.

[0032] Specifically, the sheet-type lithium metal electrode 110 includes a current collector 111, lithium metal layers 112 formed on both surfaces of the current collector 111, and a protective film 113 attached to the surface of the lithium metal layers 112.

[0033] Here, the current collector 111 is not limited to the current collectors used in conventional negative electrodes and can be used in various ways. For example, various metals or alloys such as copper, silver, and nickel can be used. The current collector 111 serves to reinforce the strength of the lithium metal layer provided in the lithium battery as a lithium ion supply source and improve the handleability.

[0034] The lithium metal layer 112 can be attached onto such a current collector 111 by using an adhesive substance, can also be attached by pressure bonding with a plate press, can also be deposited with lithium metal, and can also be formed on the current collector 111 from another substrate by a transfer method. That is, the method of forming the lithium metal layer 112 on the current collector 111 is not limited as long as the lithium metal layer 112 is attached to the current collector 111.

[0035] Such a lithium metal layer 112 serves to provide lithium ions, and its thickness can be formed to be 0.1 micrometer to 30 micrometers, specifically 1 micrometer to 30 micrometers, and more specifically, 5 micrometers to 20 micrometers.

[0036] Beyond the above range, if the thickness is too thin, it is difficult to sufficiently provide lithium ions, and if it is too thick, the volume specific capacity becomes small, which is not preferable.

[0037] The protective film 113 serves to protect the lithium metal from moisture in the air. Here, the protective film 113 can be formed of a polymer film, a polymer electrolyte film, a release film, a vapor deposition film, a metal foil, a glass fiber fabric, a functional multilayer film, etc.

[0038] Here, the polymer film is processed by treating the surface with coating or vapor deposition on films such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride - hexafluoropropene (PVDF - HFP), polyester, polyethylene (PE), polypropylene (PP), polyolefin, and polyamide materials, and various functions can be imparted as needed.

[0039] As the polymer electrolyte film, PEO, polysiloxane, PDMS, PMMA, PAN-based polymers, acrylate-based polymers, etc. can be used. It is possible to impart moisture permeability performance to the surface of the protective film 113, and the moisture permeability of the protective film 113 can be set to 0 to 10 g / m 2 / day.

[0040] For the vapor deposition film, a metal is vapor-deposited on the film to block moisture. Films such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), and nylon are mainly used. As the protective film 113, metal foils such as aluminum foil and copper foil can also be used.

[0041] Since glass fiber has high strength, it is used for the protective film 113 and can enhance the strength of the film. It can also be used by coating polymers such as PVDF, PVDF-HFP, PE, and PP on the glass fiber fabric.

[0042] The functional multilayer film is processed by laminating or coating various resins on a base film and has various functions depending on the selected resin.

[0043] As the protective film 113, in addition to such functional films, films made of general plastic films such as polypropylene, polyethylene, PET, nylon, polyester, polyolefin, and polyamide materials can also be used.

[0044] Or, the protective film 113 may contain a resin having the property of blocking or absorbing moisture.

[0045] The protective film 113 can also be formed by a method of adhering such a film form onto the lithium metal layer 112. In this case, an adhesive substance may be applied to the surface of the protective film 113 facing the lithium metal layer 112, or an adhesive substance may be applied to the lithium metal layer 112 to attach the protective film 113. The protective film 113 itself can also be made of a polymer material containing adhesiveness.

[0046] Alternatively, it can also be formed by a method of coating a protective film composition liquid onto the lithium metal layer 112 and then drying it.

[0047] Here, the thickness of the protective film 113 can be 10 nanometers to 10 micrometers. If it is smaller than this, it may not be able to exhibit a sufficient protective effect against moisture in the air. If it is too thick, it is not economical. Therefore, the thickness can be appropriately selected to the extent that it can protect the lithium metal layer 112.

[0048] Also, the area of the protective film 113 may be the same as or larger than the area of the lithium metal layer 112. If its area is smaller than that of the lithium metal layer 112, the lithium metal layer 112 cannot be effectively protected. On the other hand, if the area of the protective film 113 is larger than the area of the lithium metal layer 112, it is more preferable because it can cover up to the side surface of the lithium metal layer 112.

[0049] According to the present invention, such a sheet-type lithium metal electrode 110 is cut to the size of a unit lithium electrode before the removal of the protective film 113.

[0050] Also, in order to form tabs before, after, or simultaneously with being cut to the size of the unit lithium electrode, a tab-forming cutting process is performed together.

[0051] Here, both the process of cutting the sheet-type lithium metal electrode 110 to the size of a unit lithium electrode and the tab-forming cutting process are performed by cutting machines 141 and 142.

[0052] On the one hand, when the current collector 111, the lithium metal layer 112, and the protective film 113 are all cut simultaneously as in the present invention, the current collector 111, the lithium metal layer 112, and the protective film 113 are pushed in the cutting direction at the cut surface by the cutting pressure, and a sticking phenomenon occurs.

[0053] However, a method for effectively removing only the protective film 113 in such a form is not known.

[0054] Therefore, the inventor of the present application devised a method that can effectively remove only the protective film 113 in a very simple manner after cutting to the size of the unit lithium electrode.

[0055] Specifically, the protective film 113 is removed by an adhesive film 130 in which an adhesive layer 132 is formed on one surface of a base film 131.

[0056] Specifically, as shown in FIG. 1, after positioning the adhesive film 130 so that the adhesive layer 132 of the adhesive film 130 contacts the surface of the protective film 113, the adhesive layer 132 of the adhesive film 130 is brought into contact with the surface of the protective film 113. By such an adhesive force, the protective film 113 is adhered to the adhesive film 130, and then the adhesive film 130 is moved in a direction away from the unit lithium metal to separate the protective film 113 from the lithium metal layer 112.

[0057] In the case of such a method, the protective film 113 can be removed in a very simple manner using the adhesive film 130, and the influence on the surface of the lithium metal layer 112 can be minimized.

[0058] At the same time, after cutting the sheet-type lithium metal electrode 110 into unit lithium electrodes 120, the protective film 113 is removed immediately before laminating with the positive electrode and the separator, so that the external exposure of the lithium metal layer 112 is minimized and it can be effectively protected from contamination.

[0059] Here, the adhesive layer 132 of the adhesive film 130 may be entirely formed on one side of the base film 131 as shown in FIG. 1, but as shown in FIG. 3, the adhesive layer 132' may be formed in a dot pattern shape on one side of the base film 131', or as shown in FIG. 4, the adhesive layer 132'' may be formed in a line pattern shape on one side of the base film 131''.

[0060] That is, the adhesive layer 132 is not limited as long as it can effectively remove the protective film 113 by using the adhesive force, and can be formed in various forms.

[0061] Also, although the form of the adhesive film 130 is not limited, in order to remove only the protective film 113 from the lithium metal layer 112 without affecting other components, both ends are bent in the opposite direction facing the protective film 113, that is, bent into a U shape, and can be used in the process of removing the protective film 113. In this case, a linear contact or surface contact is made with the protective film 113 to form an adhesive force.

[0062] Thus, in order to remove the protective film 113 by the adhesive film 130, the adhesive force between the adhesive film 130 and the protective film 113 must be greater than the adhesive force between the protective film 113 and the lithium metal layer 112.

[0063] Therefore, within the range that satisfies such an adhesive force, the formation area of the adhesive layer 132 is determined on one side of the base film 131. For example, the adhesive layer 132 can be formed in an area of 30% to 100% based on the entire area of the base film 131.

[0064] If it is lower than the above range, sufficient adhesive force cannot be obtained.

[0065] In addition, as the base film 131 constituting the adhesive film 130, a substance similar to the protective film 113 can be used, and specifically, it may be a polymer film. For example, the base film can be made of PVDF, PVDF-HFP, polyester, polyethylene (PE), polypropylene (PP), polyolefin, or polyamide material.

[0066] As the adhesive layer 132, for example, polydopamine, olefin-based adhesives, silicone-based adhesives, acrylic-based adhesives, rubber-based adhesives, epoxy-based adhesives, etc. can be used. Specifically, an acrylic-based adhesive with excellent adhesive strength can be used.

[0067] As described above, for the unit lithium electrode 120 from which the protective film 113 has been removed, a step of pressing the unit lithium electrode 120 can be performed to smooth the surface of the lithium metal layer 112 and at the same time hold the cell as a whole.

[0068] Here, the pressing can be performed by a pair of rollers 150. At this time, considering the soft characteristics of the lithium metal layer 112, the pressure can be appropriately selected within a range where the surface of the lithium metal layer 112 becomes smooth and is not damaged. For example, it can be performed in the range of 0.1 kgf / mm to 50 kgf / mm.

[0069] The unit lithium electrode 120 manufactured in this way can be laminated together with the separator 220 and the positive electrode 210 immediately after the protective film 113 is removed to manufacture the electrode laminate 200.

[0070] FIG. 1 shows the electrode laminate 200 in a form where the positive electrode 210 is laminated with the unit lithium electrode 120 with the separator 220 in between. However, the electrode laminate is not limited to such a structure and can be manufactured in various forms of electrode laminates.

[0071] For example, the electrode laminate can be a bicell in which the electrodes at both ends have the same polarity, a full cell in which the electrodes at both ends have different polarities, a moncell in which a separator and a unit lithium electrode are laminated, or a laminated electrode assembly in which a positive electrode and the unit lithium electrodes are alternately arranged two or more times with a separator therebetween.

[0072] Specifically, the bicell can have a structure laminated with a positive electrode / separator / unit lithium electrode / separator / positive electrode or a unit lithium electrode / separator / positive electrode / separator / unit lithium electrode. The full cell can also have a structure laminated with a positive electrode / separator / unit lithium electrode as shown in FIG. 1. The moncell can have a structure in which one or two unit lithium electrodes and a separator are laminated.

[0073] Thus, after being laminated with a bicell, a full cell, or a moncell, it can be arranged on a separation film and wound in one direction to form a stack-and-folding type electrode assembly, wound in a zigzag to form a zigzag type electrode assembly, or laminated and laminated with a separator therebetween to form a stack-and-lamination type electrode assembly.

[0074] Alternatively, as described above, it can also mean a laminated electrode assembly in which two or more, that is, a plurality of unit lithium electrodes and a plurality of positive electrodes are alternately arranged at once with a separator therebetween.

[0075] Here, the positive electrode is manufactured by applying a positive electrode slurry containing a positive electrode active material, a conductive agent, and a binder to a positive electrode current collector, and drying and rolling the same.

[0076] The positive current collector is not particularly limited as long as it does not cause a chemical change in the battery and has conductivity. For example, stainless steel, aluminum, nickel, titanium, fired carbon, or those obtained by surface treatment of the surface of aluminum or stainless steel with carbon, nickel, titanium, silver, etc. can be used. Further, the positive current collector can have a thickness of 3 μm to 500 μm, and fine irregularities can be formed on the surface of the current collector to enhance the adhesive force of the positive electrode active material. For example, it can be used in various forms such as films, sheets, foils, nets, porous bodies, foams, non-woven fabrics, etc.

[0077] The positive electrode active material includes, for example, layered compounds such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), and compounds substituted with one or more transition metals; chemical formula Li 1+x Mn 2-x O4 (where x is 0 to 0.33), lithium manganese oxides such as LiMnO3, LiMn2O3, LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, LiV3O4, V2O5, Cu2V2O7; chemical formula LiNi 1-x M x O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x = 0.01 to 0.3) represented by Ni-site type lithium nickel oxide; chemical formula LiMn 2-x M x O2 (where M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1) or lithium manganese composite oxide represented by Li2Mn3MO8 (where M = Fe, Co, Ni, Cu or Zn); LiNi x Mn 2-x O4 represented by spinel structure lithium manganese composite oxide; LiMn2O4 in which a part of the chemical formula of Li is substituted with alkaline earth metal ions; disulfide compounds; Fe2(MoO4)3, etc. can be included, but are not limited thereto.

[0078] The conductive agent is used to impart conductivity to the electrode and can be used without particular limitation as long as it has electron conductivity and does not cause chemical changes in the battery being constructed. Specific examples include carbon-based materials such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, summer black, and carbon fiber; graphite such as natural graphite and artificial graphite; metal powders or metal fibers such as copper, nickel, aluminum, and silver; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; or conductive polymers such as polyphenylene derivatives. One of these alone or a mixture of two or more can be used. The conductive agent can be contained in an amount of 1 wt% to 30 wt%, specifically 1 wt% to 10 wt%, and more specifically 1 wt% to 5 wt% based on the total weight of the positive electrode material.

[0079] The binder plays a role in improving the adhesion between the positive electrode active material particles and the adhesive force between the positive electrode active material and the current collector. Specific examples include polyvinylidene fluoride (PVDF), vinylidene fluoride - hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, polyacrylonitrile, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene - propylene - diene polymer (EPDM), sulfonated - EPDM, styrene butadiene rubber (SBR), fluororubber, or various copolymers thereof. One of these alone or a mixture of two or more can be used. The binder can be contained in an amount of 1 wt% to 30 wt%, specifically 1 wt% to 10 wt%, and more specifically 1 wt% to 5 wt% based on the total weight of the positive electrode material.

[0080] The separation membrane separates the negative electrode and the positive electrode and provides a migration path for lithium ions. It can be used without particular limitation as long as it is usually used as a separator in a lithium secondary battery. In particular, those with low resistance to ion migration of the electrolyte and excellent electrolyte moisture retention ability are preferred. Specifically, a porous polymer film, for example, a porous polymer film made of a polyolefin-based polymer such as a homopolymer of ethylene, a homopolymer of propylene, an ethylene / butene copolymer, an ethylene / hexene copolymer, and an ethylene / methacrylate copolymer, or a laminate structure of two or more layers thereof can be used. Also, a normal porous nonwoven fabric, for example, a nonwoven fabric of high melting point glass fiber, polyethylene terephthalate fiber, etc. can be used. Further, in order to ensure heat resistance or mechanical strength, a coated separation membrane containing a ceramic component or a polymer substance can be used, and it can be selectively used in a single layer or a multilayer structure.

[0081] As described above, according to the present invention, since the unit lithium electrode is protected by the protective film 113 as long as possible until immediately before the lamination of the positive electrode and the separation membrane, the exposure time of the lithium metal layer 112 can be reduced, and the removal method of the protective film 113 can also minimize the surface damage of the lithium metal layer 112, so that it can have better quality.

[0082] Also, the electrode laminate manufactured as described above can be manufactured into a lithium metal battery with excellent quality after being manufactured as an electrode assembly, then incorporated into a battery case together with an electrolyte, and then sealed.

[0083] Regarding other components of the lithium metal battery, since they are known to those skilled in the art, descriptions thereof are omitted in this specification.

[0084] Those skilled in the art in the field to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above content.

Claims

1. A method for manufacturing a unit lithium electrode, comprising: Cutting a sheet-type lithium metal electrode including a current collector, a lithium metal layer formed on one or both surfaces of the current collector, and a protective film attached to the surface of the lithium metal layer into the size of the unit lithium electrode, and then removing the protective film with an adhesive film having an adhesive layer formed on one surface of a base film. The method for manufacturing a unit lithium electrode.

2. The method for manufacturing a unit lithium electrode according to claim 1, wherein the protective film is one selected from the group consisting of a polymer film, a polymer electrolyte film, a release film, a vapor deposition film, a metal foil, a glass fiber fabric, and a functional multilayer film.

3. The method for manufacturing a unit lithium electrode according to claim 1, further comprising a tab forming cutting step of forming a tab before, after, or simultaneously with cutting the sheet-type lithium metal electrode into the size of the unit lithium electrode.

4. The method for manufacturing a unit lithium electrode according to claim 1, wherein the step of removing the protective film is performed by a method of contacting the adhesive layer of the adhesive film with the surface of the protective film and then peeling it off.

5. The method for manufacturing a unit lithium electrode according to any one of claims 1 to 4, wherein the adhesive layer of the adhesive film is formed entirely on one surface of the base film or in a pattern shape such as a line type or a dot type.

6. The method for manufacturing a unit lithium electrode according to any one of claims 1 to 4, wherein the adhesive film is used in the step of removing the protective film in a form in which both ends are bent in a direction opposite to the surface facing the protective film.

7. The method for manufacturing a unit lithium electrode according to any one of claims 1 to 4, further comprising a step of pressing the unit lithium electrode after removing the protective film.

8. The method for manufacturing a unit lithium electrode according to claim 7, wherein the pressing is performed by a pair of pressing rollers.

9. A method for manufacturing an electrode laminate for a lithium metal battery, comprising: Preparing a unit lithium electrode by the method for manufacturing a unit lithium electrode according to any one of claims 1 to 4, and laminating the unit lithium electrode together with a separator or a positive electrode and a separator. The method for manufacturing an electrode laminate.

10. The manufacturing method of the electrode laminate according to claim 9, wherein the electrode laminate is a bicell in which the electrodes at both ends have the same polarity, a full cell in which the electrodes at both ends have different polarities, a monocell in which a separator and a unit lithium electrode are laminated, or a laminated electrode assembly in which a positive electrode and the unit lithium electrode are alternately arranged two or more times with a separator therebetween.

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