Title of the invention: Lithium electrode and lithium secondary battery including the same
Technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0003695 filed on January 11, 2019, and all contents disclosed in the documents of the Korean patent application are incorporated as part of this specification.
[2]
The present invention relates to a lithium electrode capable of improving the performance and life characteristics of a lithium secondary battery, and a lithium secondary battery including the same.
Background
[3]
Until recently, there has been considerable interest in developing a high energy density battery using lithium as a negative electrode. Compared to other electrochemical systems with nickel or cadmium electrodes, lithium intercalated carbon negative electrodes, for example, reducing the energy density of cells by increasing the weight and volume of the negative electrode in the presence of non-electroactive materials Since silver has low weight and high capacity characteristics, it is attracting very interest as a negative active material for an electrochemical cell. A lithium metal negative electrode, or a negative electrode mainly comprising lithium metal, provides an opportunity to construct a battery having a lighter weight and high energy density than a battery such as a lithium-ion, nickel metal hydride or nickel-cadmium battery. These features are highly desirable for batteries for portable electronic devices such as cell phones and laptop computers, where the premium is paid with a low weight.
[4]
A conventional lithium ion battery has an energy density of 700 wh/l by using graphite for the negative electrode and LCO (Lithium Cobalt Oxide) for the positive electrode. However, as fields requiring a high energy density have recently been expanded, the necessity to increase the energy density of a lithium ion battery has been continuously raised. For example, an increase in energy density is also necessary to increase the mileage of an electric vehicle to 500 km or more during a single charge.
[5]
In order to increase the energy density of lithium ion batteries, the use of lithium electrodes is increasing. However, lithium metal has a high reactivity and is difficult to handle and has a problem that is difficult to handle in a process.
[6]
In order to solve this problem, various attempts have been made to manufacture an electrode using lithium metal.
[7]
Korean Patent Registration No. 11738769 forms a polymer film on the surface of a lithium metal electrode, wherein the polymer film comprises at least one of a copolymer of a hydrophobic polymer and an ion conductive polymer, and a mixture of a hydrophobic polymer and an ion conductive polymer. It was made to be effectively protected from moisture. However, when the lithium metal electrode is assembled as a constituent of a battery, the polymer film formed on the surface of the lithium metal electrode acts as a resistance, causing a problem of deteriorating the life and performance of the battery.
[8]
Accordingly, there is a continuous demand for the development of a protective layer that can protect lithium metal from moisture or outside air in a lithium metal electrode and does not degrade battery performance and life.
[9]
[Prior technical literature]
[10]
[Patent Literature]
[11]
Korean Patent Registration No. 17 38769
[12]
Korean Patent Publication No. 2017-0017125
Detailed description of the invention
Technical challenge
[13]
As a result of conducting various studies to solve the above problems, the present inventors produced a lithium electrode including a lithium metal layer and an acrylic polymer layer by a transfer process using an acrylic release film including an acrylic polymer layer. The acrylic polymer layer functions as a release layer in the transfer process when manufacturing a lithium electrode, and functions as a protective layer against lithium metal in the manufactured lithium electrode, and does not act as a resistance by being dissolved in the electrolyte when the battery to which the lithium electrode is applied is driven. Confirmed that it does not.
[14]
Accordingly, an object of the present invention is to provide a lithium electrode including an acrylic polymer layer that functions as a protective layer for lithium metal and a release layer for a transfer process, and a method for manufacturing the same.
[15]
In addition, another object of the present invention is to provide a lithium secondary battery including the lithium electrode as described above.
Means of solving the task
[16]
In order to achieve the above object, the present invention, a lithium metal layer; And an acrylic polymer layer formed on at least one surface of the lithium metal layer.
[17]
The acrylic polymer layer may include an acrylic polymer and an acid release agent.
[18]
The acrylic polymer layer may include 99.9 to 99.99% by weight of an acrylic polymer and 0.01 to 0.1% by weight of an acidic release agent.
[19]
The acrylic polymer may include one or more repeating units selected from the group consisting of acrylate-based repeating units and methacrylate-based repeating units.
[20]
The acrylic polymer is an aromatic vinyl repeating unit; Imide repeating units; Vinyl cyanide repeating units; And a 3- to 6-membered heterocyclic repeating unit substituted with at least one carbonyl group; and at least one repeating unit selected from the group consisting of.
[21]
The acidic release agent may be one or more selected from the group consisting of fatty acid, stearic acid, palmitic acid, and oleic acid.
[22]
[23]
The present invention also includes the steps of (S1) forming a lithium metal layer on an acrylic release film; (S2) transferring the lithium metal layer formed on the acrylic release film to a current collector; And (S3) removing the substrate contained in the acrylic release film.
[24]
The acrylic release film is a substrate; And an acrylic polymer layer formed on at least one surface of the substrate.
[25]
The substrate is polyethylene terephthalate (PET), polyimide (PI), poly(methylmethacrylate), PMMA), cellulose tri-acetate (TAC), polypropylene (PP). , It may include one or more selected from the group consisting of polyethylene (PE) and polycarbonate (PC).
[26]
In the step (S1), it may be to deposit lithium on the acrylic release film to form a lithium metal layer.
[27]
[28]
The present invention also provides a lithium secondary battery including a lithium electrode.
[29]
The lithium secondary battery may include a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte.
[30]
The electrolyte may be a carbonate-based electrolyte.
Effects of the Invention
[31]
According to the present invention, an acrylic polymer layer is formed on at least one surface of a lithium metal layer in a lithium electrode, and the acrylic polymer layer functions as a protective layer for lithium metal.
[32]
In addition, the acrylic polymer layer may function as a release layer when removing the substrate included in the acrylic release film after the transfer process in the manufacturing method of the lithium electrode.
[33]
In addition, the acrylic polymer layer is dissolved in the electrolyte solution contained in the lithium secondary battery and thus does not act as a resistance when the battery is driven. When the electrolyte is a carbonate-based electrolyte, the acrylic polymer is easily dissolved, which may be more advantageous in improving the performance and life characteristics of the battery.
Brief description of the drawing
[34]
1 is an EIS (electrochemical impedance spectroscopy) graph measured for coin cells manufactured in Example 1 and Comparative Example 1, respectively.
Best mode for carrying out invention
[35]
Hereinafter, the present invention will be described in more detail to aid understanding of the present invention.
[36]
The terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention based on the principle that there is.
[37]
[38]
Lithium electrode
[39]
The present invention is a lithium metal layer; And an acrylic polymer layer formed on at least one surface of the lithium metal layer. Specifically, the lithium electrode is a current collector; A lithium metal layer formed on at least one surface of the current collector; And an acrylic polymer layer formed on at least one surface of the lithium metal layer.
[40]
[41]
In the present invention, the acrylic polymer layer functions as a protective layer protecting the lithium metal layer from moisture or outside air. In addition, the acrylic polymer layer may serve as a release layer when removing the substrate contained in the acrylic release film used in the method of manufacturing a lithium electrode as described below.
[42]
The acrylic polymer layer may include an acrylic polymer and an acidic release agent, and may include 99.9 to 99.99% by weight of the acrylic polymer and 0.01 to 0.1% by weight of an acidic release agent.
[43]
[44]
In addition, in the present invention, the acrylic polymer included in the acrylic polymer layer may be a polymer including one or more repeating units selected from the group consisting of acrylate-based repeating units and methacrylate-based repeating units.
[45]
At this time, the methacrylate-based repeating unit may be a methacrylate repeating unit having an aromatic ring, and the methacrylate repeating unit having an aromatic ring is, for example, a methacrylate repeating unit having 6 to 12 carbon atoms. The repeating units derived from acrylate are mentioned, and specifically, phenyl methacrylate, benzyl methacrylate, etc. are mentioned.
[46]
[47]
In addition, the acrylic polymer may include an aromatic vinyl-based repeating unit to improve heat resistance; Imide repeating units; Vinyl cyanide repeating units; And 3 to 6 membered heterocyclic repeating units substituted with at least one carbonyl group; and at least one repeating unit selected from the group consisting of.
[48]
The aromatic vinyl-based repeating unit may be a residue of an aromatic compound containing a vinyl group. The aromatic compound containing a vinyl group means a compound containing an aromatic group or a functional group in the compound and at least one vinyl group introduced therein.
[49]
Specific examples of the imide-based repeating unit include repeating units derived from maleimide, for example, derived from maleimide substituted with an alkyl group having 1 to 10 carbon atoms or maleimide substituted with an aryl group having 6 to 12 carbon atoms May be a repeating unit, specifically, may be a repeating unit derived from cyclohexyl maleide, phenyl maleimide, or the like. The content of the imide-based repeating unit may be about 1 to 30 parts by weight, preferably 5 to 20 parts by weight, more preferably 8 to 15 parts by weight based on 100 parts by weight of the copolymer resin.
[50]
In addition, the vinyl cyanide-based repeating unit may include, for example, repeating units derived from acrylonitrile.
[51]
Further, specific examples of the 3 to 6 membered heterocyclic repeating unit substituted with the at least one carbonyl group include a lactone ring unit.
[52]
For example, the acrylic polymer may include one or more selected from the group consisting of polymethyl methacrylate, poly(methyl methacrylate-ethyl acrylate) and poly(methyl methacrylate-methacrylic acid), and , Preferably, the acrylic polymer may be polymethyl methacrylate.
[53]
The content of the acrylic polymer contained in the acrylic polymer layer may include 99.9 to 99.99% by weight, preferably 99.92 to 99.98% by weight, and more preferably 99.94 to 99.96% by weight. If it is less than the above range, the protective function for the lithium metal may be deteriorated, and if it is above the above range, the content of the acidic release agent is relatively reduced, so that the function as a release layer in the manufacturing process may be reduced.
[54]
[55]
In addition, in the present invention, it means an acid-based release agent contained in the acrylic polymer layer.
[56]
Specifically, the acidic release agent may be at least one selected from the group consisting of fatty acid, stearic acid, palmitic acid, and oleic acid, preferably fatty acid. I can.
[57]
The content of the acidic release agent contained in the acrylic polymer layer may include 0.01 to 0.1% by weight, preferably 0.03 to 0.9% by weight, more preferably 0.05 to 0.8% by weight. If it is less than the above range, the release function may be deteriorated when the substrate included in the acrylic release film is removed after the transfer process in the lithium metal manufacturing method as described below. The function as a protective layer may be deteriorated.
[58]
[59]
In addition, in the present invention, the thickness of the acrylic polymer layer may be 0.05 to 3 µm, preferably 0.08 to 2 µm, more preferably 0.1 to 1 µm, and if it is less than the above range, the lithium metal layer is removed from moisture or outside air. The protective function is deteriorated, so that the lithium metal layer is damaged, or the growth of lithium dendrites cannot be prevented. If it exceeds the above range, the electrode becomes thick, which may be disadvantageous for commercialization.
[60]
[61]
As described above, the acrylic polymer layer included in the lithium electrode according to the present invention functions as a protective layer for lithium metal and at the same time serves as a release layer when removing the substrate included in the acrylic release film used in the manufacturing method of the lithium electrode. can do.
[62]
In addition, since the acrylic polymer layer is composed of only C, H, and O, it does not react with lithium metal and thus has excellent stability.
[63]
In addition, in the case of a conventional protective layer for lithium metal contained in a lithium electrode, there is a problem of acting as a resistance when a battery is driven, but there is no room for action because the acrylic polymer layer dissolves in the electrolyte solution when the battery is driven. In particular, when a carbonate-based electrolyte is used, the acrylic polymer layer may be easily dissolved and lost.
[64]
[65]
In the present invention, the lithium metal layer may be formed on one surface of the current collector, and in this case, the acrylic polymer layer may be formed on the entire surface of the lithium metal layer except for a surface in which the lithium metal layer contacts the current collector. have.
[66]
In addition, when the current collector is a porous current collector, a lithium metal layer may be included in the pores in the porous current collector, and in this case, the entire porous current collector except for a terminal connected to the porous current collector and extending to the outside An acrylic polymer layer may be provided on the surface.
[67]
The lithium metal layer may have a thickness of 1 µm to 25 µm, preferably 1 µm to 20 µm, more preferably 5 µm to 15 µm. The thickness of the lithium metal layer may vary depending on the application, and when only lithium metal is used as an electrode, for example, a negative electrode material, it is sufficient if the thickness of the lithium metal layer is in the range of 20 µm to 25 µm, but a silicon oxide negative electrode When lithium metal is used as a material for compensating for irreversibility occurring in the lithium metal layer, the thickness of the lithium metal layer may be about 5 μm to 15 μm. If the thickness of the lithium metal layer is less than the above range, the capacity and life characteristics of the battery may be deteriorated, and if the thickness of the lithium metal layer exceeds the above range, the thickness of the manufactured lithium electrode becomes thick, which may be disadvantageous for commercialization.
[68]
[69]
In the present invention, the current collector may be selected from the group consisting of copper, aluminum, nickel, titanium, calcined carbon, and stainless steel.
[70]
In addition, when the current collector is a porous current collector including pores, a lithium metal layer may be included in the pores in the porous current collector, and in this case, except for a terminal connected to the porous current collector and extending to the outside, the porous current collector An acrylic polymer layer may be provided on the entire surface. In addition, when pores are included in the porous current collector, sufficient battery capacity can be secured, and an effect of inhibiting formation of lithium dendrites can be obtained.
[71]
The method of filling the lithium metal into the pores of the porous current collector is not particularly limited and may be various. For example, lithium metal is filled into the pores by an electroplating method, a melting method, or a thin film manufacturing technique, or a method of uniformly filling lithium particles into the pores of a current collector by a paste application method is mentioned.
[72]
[73]
Method of manufacturing lithium electrode
[74]
The present invention also includes the steps of (S1) forming a lithium metal layer on an acrylic release film; (S2) transferring the lithium metal layer formed on the acrylic release film to a current collector; And (S3) removing the substrate contained in the acrylic release film.
[75]
[76]
Step (S1)
[77]
In step (S1), a lithium metal layer may be formed on the acrylic release film.
[78]
In the present invention, the acrylic release film is a substrate; And an acrylic polymer layer formed on at least one surface of the substrate.
[79]
In the present invention, the acrylic release film is a substrate; And an acrylic polymer layer formed on at least one surface of the substrate.
[80]
The substrate can withstand process conditions such as high temperature in the step of depositing lithium metal, and the lithium metal layer is transferred onto the substrate rather than the current collector during the winding process for transferring the deposited lithium metal layer to the current collector. It may have a feature that can prevent the peeling problem.
[81]
For example, the substrate is polyethylene terephthalate (PET), polyimide (PI), poly(methylmethacrylate), PMMA), cellulose tri-acetate (TAC), polypropylene ( It may be one or more selected from the group consisting of polypropylene, PP), polyethylene (PE), and polycarbonate (PC).
[82]
In addition, the thickness of the substrate may be 20 to 50 ㎛, preferably 25 to 45 ㎛, more preferably 30 to 40 ㎛. If it is less than the above range, it may be difficult to withstand conditions such as a high temperature of a process for forming a lithium metal layer on the acrylic release film, for example, a process such as deposition, and if it exceeds the above range, releasability may be reduced.
[83]
[84]
In addition, the acrylic polymer layer may minimize the formation of a surface oxide film (native layer) by protecting the lithium metal from an external environment such as moisture or outside air in a series of processes for manufacturing a lithium electrode.
[85]
The composition and physical properties of the acrylic polymer layer are the same as described above.
[86]
[87]
Step (S2)
[88]
In step (S2), the lithium metal layer formed on the acrylic release film may be transferred to a current collector.
[89]
The current collector may have the same type and physical property as described above.
[90]
[91]
Step (S3)
[92]
In step (S3), the substrate included in the acrylic release film may be removed.
[93]
As described above, the acrylic release film includes a substrate and an acrylic coating layer formed on at least one surface of the substrate, and after the step (S2), a current collector, a lithium metal layer, the acrylic coating layer, and the substrate are sequentially stacked. State.
[94]
Therefore, since the acrylic coating layer functions as a release layer, the substrate may be separated to prepare a lithium electrode in which a current collector, a lithium metal layer, and an acrylic coating layer are sequentially stacked.
[95]
[96]
Lithium secondary battery
[97]
The present invention also relates to a lithium secondary battery including the lithium electrode as described above.
[98]
In the lithium secondary battery, the lithium electrode may be included as a negative electrode, and the lithium secondary battery may include an electrolyte provided between the negative electrode and the positive electrode.
[99]
In particular, since the lithium electrode includes an acrylic polymer layer that functions as a protective layer for lithium metal, it is preferable to apply it to a lithium secondary battery using a carbonate-based electrolyte so that the acrylic polymer layer does not act as a resistance when the battery is driven. can do.
[100]
When a lithium electrode including the acrylic polymer layer is applied to a lithium secondary battery using the carbonate-based electrolyte, the acrylic polymer layer is easily dissolved in the carbonate-based electrolyte and disappears when the battery is driven, so that it does not act as a resistance.
[101]
[102]
The shape of the lithium secondary battery is not limited, and may be, for example, a coin type, a flat plate type, a cylinder type, a horn type, a button type, a sheet type, or a stack type. In addition, the lithium secondary battery may be manufactured as a flow battery, further including tanks for storing positive and negative electrolytes, and pumps for moving the respective electrolytes to the electrode cells.
[103]
The electrolyte may be an electrolyte in which the negative electrode and the positive electrode are impregnated.
[104]
The lithium secondary battery may further include a separator provided between the negative electrode and the positive electrode. Any separation membrane positioned between the cathode and the anode may be used as long as it separates or insulates the cathode and the anode from each other and enables ion transport between the cathode and the anode. For example, it may be a non-conductive porous film or an insulating porous film. More specifically, a polymer nonwoven fabric such as a nonwoven fabric made of polypropylene or a nonwoven fabric made of polyphenylene sulfide; Alternatively, a porous film of an olefin-based resin such as polyethylene or polypropylene may be exemplified, and two or more types of these may be used in combination.
[105]
The lithium secondary battery may further include a positive electrode electrolyte on a positive electrode side and a negative electrolyte solution on a negative electrode side separated by a separator. The positive electrolyte and negative electrolyte may each contain a solvent and an electrolytic salt. The positive electrode electrolyte and the negative electrode electrolyte may be the same as or different from each other.
[106]
The electrolyte may be an aqueous electrolyte or a non-aqueous electrolyte. The aqueous electrolyte solution may contain water as a solvent, and the nonaqueous electrolyte solution may contain a nonaqueous solvent as a solvent.
[107]
The non-aqueous solvent may be selected from those generally used in the art, and is not particularly limited, but for example, carbonate, ester, ether, ketone, organosulfur, organophosphorous ) System, an aprotic solvent, and a combination thereof.
[108]
The electrolytic salt refers to dissociation into cations and anions in water or a non-aqueous organic solvent, and is not particularly limited as long as lithium ions can be transferred in a lithium secondary battery, and those generally used in the art may be selected.
[109]
The concentration of the electrolytic salt in the electrolyte may be 0.1 M or more and 3 M or less. In this case, the charge/discharge characteristics of the lithium secondary battery can be effectively expressed.
[110]
The electrolyte may be a solid electrolyte film or a polymer electrolyte film.
[111]
Materials of the solid electrolyte membrane and the polymer electrolyte membrane are not particularly limited, and those generally used in the art may be employed. For example, the solid electrolyte membrane may include a composite metal oxide, and the polymer electrolyte membrane may be a membrane in which a conductive polymer is provided inside a porous substrate.
[112]
The positive electrode refers to an electrode that accepts electrons when the battery is discharged in a lithium secondary battery and reduces lithium-containing ions. On the contrary, when the battery is charged, it acts as a negative electrode (anode), and the positive electrode active material is oxidized to emit electrons and lose lithium-containing ions.
[113]
The positive electrode may include a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector.
[114]
In the present specification, the material of the positive electrode active material of the positive electrode active material layer is not particularly limited as long as it is applied to a lithium secondary battery together with the negative electrode to reduce lithium-containing ions during discharge and oxidize during charging. For example, it may be a transition metal oxide or a composite material based on sulfur (S), specifically LiCoO 2 , LiNiO 2 , LiFePO 4 , LiMn 2 O 4 , LiNi x Co y MnzO 2 (here, x+y+ z=1), Li 2 FeSiO 4 , Li 2 FePO 4 F, and may include at least one of Li 2 MnO 3 .
[115]
In addition, when the positive electrode is a composite material based on sulfur (S), the lithium secondary battery may be a lithium sulfur battery, and the composite material based on the sulfur (S) is not particularly limited, and is generally used in the art. It can be applied by selecting the anode material used as.
[116]
The present specification provides a battery module including the lithium secondary battery as a unit battery.
[117]
The battery module may be formed by stacking with a bipolar plate provided between two or more lithium secondary batteries according to an exemplary embodiment of the present specification.
[118]
When the lithium secondary battery is a lithium air battery, the bipolar plate may be porous to supply air supplied from the outside to a positive electrode included in each lithium air battery. For example, it may include porous stainless steel or porous ceramic.
[119]
The battery module may be specifically used as a power source for an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device.
Mode for carrying out the invention
[120]
Hereinafter, preferred embodiments are presented to aid in the understanding of the present invention, but the following examples are only illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that changes and modifications fall within the appended claims.
[121]
[122]
Example 1
[123]
Lithium was deposited on one side of a 20 m long acrylic release film (I-One Film Co., Ltd.) by a thermal evaporation method to form a 20 µm-thick lithium metal layer. At this time, the evaporation equipment was ULVAC's EWK-030 equipment, and the line speed was set to 0.1 m/min, the temperature of the lithium source part was 500℃, and the temperature of the main roll was set to -25℃. The acrylic release film (I-One Film Co., Ltd.) has a structure in which an acrylic polymer layer is formed on a PET substrate.
[124]
After transferring the lithium metal layer with Cu foil (UACJ, 20 μm, C100 grade), the substrate contained in the acrylic release film was removed to prepare a lithium electrode.
[125]
The lithium electrodes were punched into a circular shape with a size of 14 pi (anode size for 2032 coin cell) and 15 pi (cathode size for 2032 coin cell), respectively, and carbonate-based electrolyte (EC+EMC(EC:EMC=3:7 (v/ v)) + LiPF 6 1M) and a Li/Li symmetry cell was prepared as a 2032 coin cell. In this case, EC is Ethylene Carbonate, and EMC is Ethyl-Methyl Carbonate.
[126]
[127]
Comparative Example 1
[128]
Lithium was deposited on one surface of a Cu foil (UACJ, 20 µm, C100 grade) by thermal evaporation to form a 20 µm-thick lithium metal layer to prepare a lithium electrode.
[129]
In addition, a coin cell was manufactured using the lithium electrode in the same manner as in Example 1.
[130]
[131]
Experimental Example 1
[132]
EIS (electrochemical impedance spectroscopy) was measured by setting the coin cells prepared in Example 1 and Comparative Example 1 at a frequency of 10 mHz to 1 MHz in Potentiostat (Bio Logic Corporation, VMP-3000)).
[133]
1 is an EIS graph measured for coin cells manufactured in Example 1 and Comparative Example 1, respectively.
[134]
Referring to FIG. 1, Example 1 using a lithium electrode including a protective layer for lithium metal and an acrylic polymer layer functioning as a release layer in the manufacturing process of a lithium electrode and a comparative example in which a protective layer for lithium metal was not included 1 shows that there is little difference in resistance.
[135]
From this, it can be seen that in the lithium electrode of Example 1, the acrylic polymer layer serving as a protective layer for lithium metal does not act as a resistance when the battery is driven.
[136]
[137]
In the above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following description by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be made.
[138]
Claims
[Claim 1]
Lithium metal layer; And an acrylic polymer layer formed on at least one surface of the lithium metal layer.
[Claim 2]
The lithium electrode according to claim 1, wherein the acrylic polymer layer comprises an acrylic polymer and an acidic release agent.
[Claim 3]
The lithium electrode of claim 1, wherein the acrylic polymer layer contains 99.9 to 99.99% by weight of an acrylic polymer and 0.01 to 0.1% by weight of an acidic release agent.
[Claim 4]
The lithium electrode according to claim 2, wherein the acrylic polymer comprises one or more repeating units selected from the group consisting of acrylate-based repeating units and methacrylate-based repeating units.
[Claim 5]
The method of claim 4, wherein the acrylic polymer is an aromatic vinyl repeating unit; Imide repeating units; Vinyl cyanide repeating units; And a 3 to 6 membered heterocyclic repeating unit substituted with at least one carbonyl group; the lithium electrode further comprises at least one repeating unit selected from the group consisting of.
[Claim 6]
The lithium electrode of claim 2, wherein the acidic release agent is at least one selected from the group consisting of fatty acid, stearic acid, palmitic acid, and oleic acid.
[Claim 7]
(S1) forming a lithium metal layer on the acrylic release film; (S2) transferring the lithium metal layer formed on the acrylic release film to a current collector; And (S3) removing the substrate contained in the acrylic release film; containing, a method of manufacturing a lithium electrode.
[Claim 8]
The method of claim 7, wherein the acrylic release film is a substrate; And an acrylic polymer layer formed on at least one surface of the substrate.
[Claim 9]
The method of claim 7, wherein the substrate is polyethylene terephthalate (PET), polyimide (PI), poly(methylmethacrylate), PMMA), cellulose tri-acetate (TAC), poly Propylene (Polypropylene, PP), polyethylene (Polyethylene, PE), and polycarbonate (Polycarbonate, PC) containing at least one selected from the group consisting of, a method of manufacturing a lithium electrode.
[Claim 10]
The method of claim 7, wherein in the step (S1), a lithium metal layer is formed by depositing lithium on the acrylic release film.
[Claim 11]
A lithium secondary battery comprising the lithium electrode of any one of claims 1 to 6.
[Claim 12]
The lithium secondary battery of claim 11, wherein the lithium secondary battery includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and an electrolyte.
[Claim 13]
The lithium secondary battery according to claim 12, wherein the electrolyte is a carbonate-based electrolyte.