Specification Title of the invention: Electrode for lithium secondary battery and its manufacturing method Technical field [One] Cross-reference with related application(s) [2] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0100361 filed on August 27, 2018, and includes all the contents disclosed in the literature of the Korean patent application as part of this specification. [3] The present invention relates to an electrode for a lithium secondary battery that is applied to a lithium secondary battery to increase the cycle performance and efficiency of the battery, and a method of manufacturing the same. Background [4] With the rapid development of the electronics, communication, and computer industries, the fields of application of energy storage technology are expanding to camcorders, mobile phones, notebook computers, PCs, and even electric vehicles. Accordingly, development of a high-performance secondary battery that is light, can be used for a long time, and has high reliability is in progress. [5] Among the currently applied secondary batteries, lithium secondary batteries developed in the early 1990s have a higher operating voltage and higher energy density than conventional batteries such as Ni-MH, Ni-Cd, and sulfuric acid-lead batteries using aqueous electrolyte solutions. Are receiving. [6] Lithium metal, carbon-based material, silicon, and the like are used as negative active materials of lithium secondary batteries, and among them, lithium metal has the advantage of obtaining the highest energy density, and thus, continuous research is being conducted. [7] Lithium electrodes using lithium metal as an active material are generally manufactured by using a flat copper or nickel foil as a current collector and attaching a lithium foil thereon. Alternatively, the lithium foil itself can be used as a lithium electrode without a separate current collector. [8] However, such a lithium electrode has a problem in that lithium dendrite grows unevenly on the surface during the process of depositing and stripping lithium metal on the electrode during battery charging and discharging. Lithium dendrites may cause damage to the separator and cause a short circuit in the lithium secondary battery to deteriorate the safety of the battery, so improvement is required. Detailed description of the invention Technical challenge [9] An object of the present invention is to provide an electrode for a lithium secondary battery and a method of manufacturing the same, which can improve the cycle and efficiency characteristics of a lithium secondary battery by uniform deposition and peeling of lithium metal during battery charging and discharging. Means of solving the task [10] In order to achieve the above object, the present invention, [11] A polymer film having a pattern formed on one surface in which a plurality of hemispherical protrusions having a diameter of 5 to 50 μm are regularly arranged; [12] A conductive metal layer formed on the pattern of the polymer film; And [13] It provides an electrode for a lithium secondary battery comprising a lithium metal layer formed on the conductive metal layer. [14] The height of the hemispherical protrusion may be 3 to 50 μm. [15] Preferably, the diameter of the hemispherical protrusion may be 7 to 40 μm, and the height may be 5 to 40 μm. [16] The interval between the hemispherical protrusions may be 2 to 50 μm. [17] The polymer film may be at least one selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polybutene, polyphenyl sulfide, polyethylene sulfide, polyimide, and Teflon. [18] The polymer film may have a thickness of 5 to 30 μm excluding the height of the hemispherical protrusion. [19] The conductive metals are Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In and It may be one or more selected from the group consisting of Zn. [20] The thickness of the conductive metal layer may be 0.5 to 10 μm. [21] The thickness of the lithium metal layer may be 5 to 50 μm. [22] In addition, the present invention provides a lithium secondary battery including the lithium secondary battery electrode. [23] In addition, the present invention comprises the steps of preparing a polymer film having a pattern formed on one surface in which a plurality of hemispherical protrusions having a diameter of 5 to 50 μm are regularly arranged; [24] Forming a conductive metal layer by electroless plating a conductive metal precursor on the patterned polymer film; And [25] It provides a method of manufacturing an electrode for a lithium secondary battery comprising the step of forming a lithium metal layer by electrolytic plating a lithium metal on the conductive metal layer. [26] The conductive metal precursor is Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, In Or it may be at least one selected from the group consisting of a sulfate, halide, nitrate, or hydroxide of Zn. [27] In the electroless plating step, at least one selected from the group consisting of glycine, formaldehyde, hydrazine and citric acid may be used as a reducing agent. [28] The conductive metal layer may be formed to a thickness of 0.5 to 10 μm. [29] The lithium metal layer may be formed to a thickness of 5 to 50 μm. Effects of the Invention [30] When the electrode for a lithium secondary battery of the present invention is applied to a lithium secondary battery, the deposition and peeling of lithium metal occurs uniformly over the entire surface of the electrode during charging and discharging of the battery, thereby suppressing the formation of non-uniform lithium dendrites. Cycle and efficiency characteristics can be improved. [31] In addition, since the electrode for a lithium secondary battery of the present invention exhibits remarkably higher flexibility compared to a conventional electrode including a metal current collector and an active material layer, processability can be improved during electrode manufacturing and battery assembly. Brief description of the drawing [32] 1 is a cross-sectional view of an electrode for a lithium secondary battery according to an embodiment of the present invention. [33] 2 is a cross-sectional view showing the shape of the polymer film of the present invention. [34] 3 shows a method of manufacturing an electrode for a lithium secondary battery according to an embodiment of the present invention. Mode for carrying out the invention [35] The terms used in the present specification are only used to describe exemplary embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise", "include", or "have" are intended to designate the existence of implemented features, steps, components, or a combination thereof, and one or more other features or steps, It is to be understood that the possibility of the presence or addition of components, or combinations thereof, is not excluded in advance. [36] The present invention will be described in detail below and exemplifying specific embodiments, which can be made various changes and have various forms. However, this is not intended to limit the present invention to a specific form disclosed, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. [37] Likewise, the drawings attached to the present specification to describe the present invention are exemplary embodiments of the present invention, and the present invention may be implemented in various different forms, and the present disclosure is not limited thereto. In this case, parts irrelevant to the description are omitted in the drawings in order to clearly describe the present invention, and similar reference numerals are used for similar parts throughout the specification. In addition, the size and relative size of the components indicated in the drawings are not related to the actual scale, and may be reduced or exaggerated for clarity of description. [38] Electrode for lithium secondary battery and manufacturing method thereof [39] The present invention [40] A polymer film having a pattern formed on one surface in which a plurality of hemispherical protrusions having a diameter of 5 to 50 μm are regularly arranged; [41] A conductive metal layer formed on the pattern of the polymer film; And [42] It relates to an electrode for a lithium secondary battery comprising a lithium metal layer formed on the conductive metal layer. [43] 1 shows a structure of an electrode 100 for a lithium secondary battery according to an embodiment of the present invention. [44] The electrode for a lithium secondary battery of the present invention has a structure in which a conductive metal layer 20 and a lithium metal layer 30 are sequentially stacked on a polymer film 10 having a pattern formed on one surface thereof. The polymer film 10 serves as a support for the conductive metal layer 20 and the lithium metal layer 30, and the pattern formed on the polymer film has a shape in which a plurality of hemispherical protrusions 11 are regularly arranged, Since the thin conductive metal layer 20 and the lithium metal layer 30 are laminated on the pattern shape, the surface of the electrode to be finally manufactured has a plurality of hemispherical protrusions according to the pattern shape of the polymer film 10. In this case, the term'hemispherical protrusion' refers to a hemispherical-like protrusion in which the outer periphery of the protrusion has a curved shape, and does not necessarily mean only a hemispherical shape. [45] When the pattern of the hemispherical protrusion is formed on the electrode surface as described above, it is possible to induce a uniform current flow on the electrode surface during the charging and discharging process of the battery. Accordingly, deposition and peeling of lithium metal on the surface occurs evenly, resulting in non-uniform lithium den Dryt growth can be significantly inhibited. Accordingly, the electrode for a lithium secondary battery of the present invention can greatly improve stability, cycle characteristics, and efficiency during driving of a lithium secondary battery. On the other hand, as confirmed in the experimental examples to be described later, this uniform current flow induction effect can be obtained when the outer periphery of the protrusion of the pattern has a curved shape, and when the protrusion includes an angled portion such as a cube shape, the current density It is difficult to expect a dispersion effect. Further, even if the outer circumferential portion is a curved hemispherical protrusion, the above effect can be secured only when the diameter of the protrusion satisfies an appropriate range. [46] In order to secure the above effect, the diameter of the hemispherical protrusion 11 in the pattern of the polymer film 10 is 5 μm or more, or 7 μm or more, or 10 μm or more, and 50 μm or less, or 40 μm or less, or It is preferably 30 μm or less. As shown in FIG. 2, the diameter (d) of the hemispherical protrusion means the longest linear distance from one side of the lowermost portion of the hemispherical protrusion to the other side. If the diameter of the hemispherical protrusion is less than 5 μm, the conductive metal layer 20 and the lithium metal layer 30 may be stacked so that the pattern shape may not be clearly visible on the surface of the lithium metal layer of the finally manufactured electrode. If it is too large, it is difficult to secure the effect of uniformizing the current density by patterning, so it is preferable to satisfy the above range. [47] On the other hand, the height h1 of the hemispherical protrusion 11 means the height from the bottom to the top of the hemispherical protrusion, and is 3 μm or more, or 5 μm or more, or 10 μm or more, and 50 μm or less, or 40 μm or less. , Or it is preferably 30 μm or less. It is preferable to be. If the height of the hemispherical protrusion 11 is less than 3 μm, the shape of the pattern may not be clearly revealed on the finally manufactured electrode, and if it exceeds 50 μm, the electrode may become too thick and the energy density may decrease. . [48] In addition, as shown in FIG. 2, the interval g between the hemispherical protrusions 11 refers to the shortest linear distance from the lowermost side of one hemispherical protrusion to the other hemispherical protrusion, and the spacing of the hemispherical protrusions is It is preferably 50 μm or less, or 40 μm or less, or 30 μm or less. Since one hemispherical protrusion can be arranged without any gap with other hemispherical protrusions, the lower limit of the spacing of the hemispherical protrusion is not limited, but 2 μm in consideration of the thickness of the conductive metal layer and the lithium metal layer laminated on the polymer film. It may be desirable to have a spacing of at least 3 μm or more. [49] If the polymer film is too thick, the flexibility of the electrode decreases, and if the polymer film is too thin, it cannot serve as a support, and thus processability may be impaired during electrode manufacturing and battery assembly. Accordingly, the thickness (h2) of the polymer film excluding the height of the hemispherical protrusion is preferably in the range of 5 to 30 μm, or 8 to 15 μm. [50] On the other hand, the material of the polymer film is not particularly limited, but a polymer having a property that has flexibility, does not react easily to an organic electrolyte, and has excellent tensile strength and does not easily break may be suitably used. For example, the material of the polymer film that can be used in the present invention is made of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polybutene, polyphenyl sulfide, polyethylene sulfide, polyimide, and Teflon. One or more selected from the group may be mentioned, but the present invention is not limited thereto. Among them, polyethylene terephthalate (PET), polyimide, or Teflon, which is flexible and has excellent strength, is preferred, and PET is more preferred. [51] In the present invention, the conductive metal layer 20 is made of a conductive metal capable of functioning as a current collector, and the conductive metal may be used without limitation, which is generally used for a negative electrode current collector of a lithium secondary battery. For example, the conductive metal is Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb , In and Zn may be one or more selected from the group consisting of, in consideration of conductivity and economics, preferably Ni, Cu, or Ti may be, more preferably Ni may be. [52] The thickness of the conductive metal layer 20 may be in the range of 0.5 to 10 μm, or 1 to 7 μm, or 2 to 5 μm. If the conductive metal layer 20 is too thick exceeding 10 μm, the energy density may be lowered, resulting in poor battery performance, and the pattern formed on the polymer film 10 may not appear on the surface of the finally manufactured electrode. Cannot be secured. On the contrary, if it is too thin to be less than 0.5 μm, there may be a problem in that the conductive metal layer is not uniformly formed, so that the conductivity is not sufficiently secured, so it is preferable that the above range is satisfied. [53] The electrode for a lithium secondary battery of the present invention contains lithium metal as an active material. The lithium metal layer 30 is formed on the conductive metal layer 20, and preferably has a thickness of 5 μm or more, or 10 μm or more for stable charging and discharging of the electrode. On the other hand, if the lithium metal layer 30 is too thick, the pattern formed on the polymer film 10 cannot appear on the lithium metal layer 30, so that the effects of the present invention cannot be achieved. Therefore, the thickness of the lithium metal layer 30 is preferably 50 μm or less, or 40 μm or less. [54] The method of manufacturing the electrode for a lithium secondary battery of the present invention is not particularly limited, but as an example, a polymer film having a pattern formed on one surface in which a plurality of hemispherical protrusions having a diameter of 5 to 50 μm are regularly arranged as shown in FIG. 3 Preparing; [55] Forming a conductive metal layer by electroless plating a conductive metal precursor on the pattern of the polymer film; And [56] It may be manufactured by a manufacturing method including the step of forming a lithium metal layer by electroplating lithium metal on the conductive metal layer, which may be further embodied by examples to be described later. [57] The polymer film may be commercially available or may be directly manufactured and used. When the polymer film is directly manufactured and used, the manufacturing method is not limited, and extrusion molding, injection molding, and solution casting methods known in the art may be variously applied. A method of forming a pattern on the polymer film is not particularly limited, but a method of forming a pattern by placing a planar polymer film on a mold and pressing and/or heating it may be used. [58] Forming the conductive metal layer may be performed by an electroless plating method using a conductive metal precursor. Electroless plating is a method of depositing a metal on the surface of an object to be treated by reducing metal ions in a metal salt to metal in an aqueous solution, and a conventional electroless plating method known in the art can be used without limitation. [59] Conductive metal precursors used in the electroless plating step are Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Sulfates, halides, nitrates, or hydroxides of Ge, Sb, Pb, In or Zn may be used. The conductive metal precursor is preferably used in the range of 0.1 M to 3 M, or 0.5 M to 1.5 M, so that a sufficient amount of the conductive metal layer can be formed on the polymer film. [60] In the electroless plating step, glycine, formaldehyde, hydrazine, citric acid, and the like may be used as reducing agents, and these reducing agents may be used in an appropriate range depending on the number of moles of the conductive metal precursor used. For example, when the conductive metal precursor contains a monovalent metal ion, the reducing agent may be used in a range of 0.1 to 3 M or 0.5 to 1.5 M, and when a divalent metal ion is included, about twice the concentration ( 0.2 to 6 M or 1 to 3 M range), in the case of containing a trivalent metal ion, it may be used by adjusting it to about 3 times the concentration (0.3 to 9 M or 1.5 to 4.5 M range). [61] On the other hand, in the electroless plating step, the conductive metal precursor solution and the reducing agent solution may be continuously injected at a constant rate without being injected at a time into the electrolytic bath containing the polymer film and water to be treated. When the conductive metal precursor solution and the reducing agent solution are temporarily added to the electrolyzer, the conductive metal layer may not be uniformly formed because electroless plating does not occur uniformly on the polymer film. It is preferable. For example, the conductive metal precursor solution and the reducing agent solution may be added at a rate of 0.05 to 1 ml/min, or 0.1 to 0.5 ml/min, and the input time (reaction time) is 20 minutes to 5 hours, or 30 It can be from minutes to 3 hours. [62] The lithium metal layer may be formed by electrolytic plating of lithium metal. Electrolytic plating may be performed in the presence of a lithium salt in a non-aqueous solvent, and the non-aqueous solvent includes 1,4-dioxane, 1,2-dimethoxyethane, tetrahydrofuran, dichloromethane, N-methylpyrrolidone, Propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, gamma-butyrolactone, 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydroxy franc , 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxolane, 4-methyl-1,3-dioxene, diethyl ether, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, Methyl formate, methyl acetate, phosphoric acid tryster, trimethoxy methane, dioxolane derivative, sulfolane, methylsulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivative, tetrahydrofuran derivative, ether, One or more selected from the group consisting of organic solvents such as methyl propionate and ethyl propionate may be used. [63] In addition, the lithium salt is LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiSCN, LiC 4 BO 8 , LiCF 3 CO 2 , LiCH 3 SO 3 , LiCF 3 SO 3 , LiN(SO 2 F) 2 , LiN(SO 2 CF 3 ) 2, LiN(SO 2 C 2 F 5 ) 2 , LiC 4 F 9 SO 3 , LiC(CF 3 SO 2 ) 3 , (CF 3 SO 2 ) 2 NLi, lithium chloroborane, lithium lower aliphatic carboxylic acid, tetraphenylboric acid At least one selected from the group consisting of lithium and lithium imide may be used. Among these, it is more preferable to use at least one selected from the group consisting of LiN(SO 2 F) 2 , LiCl, and LiPF 6 in consideration of reactivity . [64] The process conditions of the electrolytic plating step are not particularly limited, but as an example, a polymer film having a conductive metal layer formed in an electrolytic bath containing the non-aqueous solvent and lithium salt is put, and 0.1 to 10 mA/cm at room temperature in the range of 20 to 30°C. It can be carried out by a method of applying a current of 2 . [65] Lithium secondary battery [66] The present invention provides a lithium secondary battery including the above-described lithium secondary battery electrode. The lithium secondary battery of the present invention includes a positive electrode, a negative electrode, a separator interposed therebetween, and an electrolyte, and the electrode for a lithium secondary battery is preferably used as a negative electrode. As described above, by using the lithium electrode of the present invention as a negative electrode, the lithium secondary battery of the present invention remarkably suppresses the growth of lithium dendrites during charging and discharging, thereby securing the cycle and efficiency characteristics of the battery, and improving battery stability. I can. [67] The configuration of the positive electrode, the separator, and the electrolyte of the lithium secondary battery is not particularly limited in the present invention, and follows what is known in the art. [68] (1) anode [69] The positive electrode includes a positive electrode active material formed on the positive electrode current collector. [70] The positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes to the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or carbon, nickel on the surface of aluminum or stainless steel , Titanium, silver, or the like may be used. At this time, the positive electrode current collector may use various forms such as a film, sheet, foil, net, porous material, foam, non-woven fabric, etc. having fine irregularities formed on the surface so as to increase adhesion to the positive electrode active material. [71] As the positive electrode active material constituting the electrode layer, any positive electrode active material available in the art may be used. As a specific example of such a positive active material, lithium metal; Lithium cobalt oxides such as LiCoO 2 ; Li 1+x Mn 2-x O 4 (wherein x is 0 to 0.33), LiMnO 3 , LiMn 2 O 3 , Lithium manganese oxides such as LiMnO 2 ; Lithium copper oxides such as Li 2 CuO 2 ; LiV 3 O 8 , LiFe 3 O 4 , V 2 O 5 , Cu 2 V 2 O 7Vanadium oxides such as; LiNi 1-x M x O 2 (here, M=Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x=0.01 to 0.3) lithium nickel-based oxide; LiMn 2-x MxO 2 (here, M=Co, Ni, Fe, Cr, Zn or Ta, and x=0.01 to 0.1) or Li 2 Mn 3 MO 8 (where M=Fe, Co, Ni, Cu Or a lithium manganese composite oxide represented by Zn); Li(Ni a Co b Mn c )O 2 (here, lithium-nickel-manganese- represented by 0 [90] After soaking a PET film (10 µm thick excluding the height of the protrusions) with a pattern of hemispherical protrusions (10 µm in diameter, 10 µm in height and 5 µm spacing between protrusions) in a water tank, Nickel sulfate (1M) and Glycine (1M) was administered at a rate of 0.15 mL/min to perform Ni electroless plating for 2 hours. The prepared Ni/PET film (Ni layer thickness of 2 μm) was washed with distilled water and dried. [91] Put the prepared Ni/PET film in a 1,4-dioxane (DX): 1,2-dimethoxyethane (DME) solution (1:2, v/v) in which 1M LiFSI is dissolved and 1 at room temperature (25°C). Li electroplating was performed by applying a current of mA/cm 2 . At this time, PESC05 from PNE solution was used as the electroplating equipment. Through this, a lithium metal plated with a thickness of 20 μm, Li/Ni/PET were sequentially stacked and an electrode for a lithium secondary battery having a plurality of regular hemispherical protrusions was obtained. [92] [93] After preparing a symmetric cell in which the prepared lithium secondary battery electrode was disposed on both sides with a polyolefin separator interposed therebetween, 1M LiPF in a solvent mixed with ethylene carbonate (EC) and diethyl carbonate (DEC) in a volume ratio of 50:50 The electrolytic solution in which 6 was dissolved was injected to prepare a coin-type battery. [94] [95] The above prepared lithium secondary cell electrode (cathode) and, as a positive electrode active material LiCoO 2 96 wt.%, Denka black (conductive material) 2% by weight of PVdF (Polyvinylidene fluoride, a binder), 2 wt% NMP (N-Methyl-2- pyrrolidone) was added to one side of an aluminum current collector to a thickness of 65 µm, and a positive electrode made by drying and rolling was placed on both sides with a polyolefin separator interposed therebetween, and then ethylene carbonate ( EC) and diethyl carbonate (DEC) in a volume ratio of 50:50 was injected into a solvent in which 1M LiPF 6 was dissolved in an electrolyte to prepare a coin-type battery. [96] Example 2 [97] In the same manner as in Example 1, except that a PET film having a hemispherical protrusion having a diameter of 20 μm was used, an electrode for a lithium secondary battery and a coin-type battery including the same were manufactured. [98] Example 3 [99] In the same manner as in Example 1, except that a PET film having a hemispherical protrusion having a diameter of 40 μm was used, an electrode for a lithium secondary battery and a coin-type battery including the same were manufactured. [100] Example 4 [101] In the same manner as in Example 1, except that a PET film having a hemispherical protrusion height of 20 μm was used, an electrode for a lithium secondary battery and a coin-type battery including the same were manufactured. [102] Example 5 [103] A lithium secondary battery electrode and a coin-type battery including the same were manufactured in the same manner as in Example 1, except that a PET film having a hemispherical protrusion spacing of 10 µm was used. [104] Comparative Example 1 [105] In the same manner as in Example 1, except that a PET film without a pattern of a hemispherical protrusion was used, an electrode for a lithium secondary battery and a coin-type battery including the same were manufactured. [106] Comparative Example 2 [107] A coin-type battery was manufactured in the same manner as in Example 1, except that a lithium metal foil (20 μm) without any treatment was used as an electrode for a lithium secondary battery. [108] Comparative Example 3 [109] In the same manner as in Example 1, except that the shape of the hemispherical protrusion as a PET film was not a hemispherical shape, but a cube shape with a side length of 10 μm, a lithium secondary battery electrode and a coin-type battery including the same were prepared. . [110] Comparative Example 4 [111] In the same manner as in Example 1, except that a PET film having a hemispherical protrusion having a diameter of 4 μm was used, an electrode for a lithium secondary battery and a coin-type battery including the same were manufactured. [112] Comparative Example 5 [113] In the same manner as in Example 1, except that a PET film having a hemispherical protrusion having a diameter of 60 μm was used, an electrode for a lithium secondary battery and a coin-type battery including the same were manufactured. [114] Experimental Example 1 [115] Each coin-type symmetric cell prepared in Examples and Comparative Examples was repeatedly charged and discharged for 1 hour at a current density of 1 mA/cm 2 using an electrochemical charger (PNE Solution, PESC05) . At this time, the 100th cycle overvoltage compared to the first cycle overvoltage is shown in Table 1 below. [116] Experimental Example 2 [117] Each coin-type full cell prepared in the above Examples and Comparative Examples was charged and discharged using an electrochemical charger (PNE Solution, PESC05). Charging is a voltage of 4.4 V vs. Until Li/Li+, discharge is 3.0 V vs. It was applied until it became Li/Li+, and the current density was applied at 0.5C-rate. At this time, the discharge capacity of the 100th cycle compared to the discharge capacity of the first cycle is compared and shown in Table 1 below. [118] [Table 1] [119] As a result of the experiment, in the case of Examples 1 to 5, it was found that the rate of increase in overvoltage of the 100th cycle was significantly lower than that of Comparative Examples 1 to 2, and the discharge capacity of the 100th cycle was significantly higher than that of the first cycle. The reason is considered to be that the electrode surface has a hemispherical pattern, and the deposition and peeling of lithium uniformly occurred on the entire electrode surface during battery charging and discharging. On the other hand, in Comparative Examples 1 to 2 without a pattern on the electrode surface, the overvoltage rapidly increased and the discharge capacity was significantly decreased.As a result, the current was concentrated in a specific part of the lithium metal surface, resulting in uneven deposition and peeling of lithium. It can be confirmed that it was done. [120] On the other hand, as in Comparative Example 3, when the protrusion shape of the pattern is angular in the shape of a cube rather than a hemispherical shape, the overvoltage increase rate was higher than that of Examples 1 to 5, and the discharge capacity was lowered, which is the current to the angled corner. This is believed to be due to the increased density inhibiting uniform charging and discharging. [121] In addition, in the case of Comparative Examples 4 to 5, the overvoltage increase rate was higher and the discharge capacity was lower than in Examples 1 to 5, because the diameter of the hemispherical protrusion was too small or too large, so that the effect of uniformly distributing the current was somewhat inferior. It is judged as. From the above results, it can be confirmed that the diameter of the hemispherical protrusion must satisfy the range of 5 to 50 μm in order to secure the effect of the present invention. [122] [Explanation of code] [123] 10: polymer film with a pattern formed on one side [124] 11: hemispherical protrusion [125] 20: conductive metal layer [126] 30: lithium metal layer [127] 100: lithium secondary battery electrode Claims [Claim 1] A polymer film having a pattern formed on one surface in which a plurality of hemispherical protrusions having a diameter of 5 to 50 μm are regularly arranged; A conductive metal layer formed on the pattern of the polymer film; And comprising a lithium metal layer formed on the conductive metal layer, a lithium secondary battery electrode. [Claim 2] The electrode for a lithium secondary battery according to claim 1, wherein the hemispherical protrusion has a height of 3 to 50 μm. [Claim 3] The electrode of claim 1, wherein the hemispherical protrusion has a diameter of 7 to 40 μm and a height of 5 to 40 μm. [Claim 4] The electrode according to claim 1, wherein the interval between the hemispherical protrusions is 2 to 50 μm. [Claim 5] The method of claim 1, wherein the polymer film is selected from the group consisting of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polybutene, polyphenyl sulfide, polyethylene sulfide, polyimide, and Teflon. An electrode for a lithium secondary battery of more than one species. [Claim 6] The electrode according to claim 1, wherein the polymer film has a thickness of 5 to 30 μm excluding the height of the hemispherical protrusion. [Claim 7] The method of claim 1, wherein the conductive metal is Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, An electrode for a lithium secondary battery, which is at least one selected from the group consisting of Sb, Pb, In, and Zn. [Claim 8] The electrode according to claim 1, wherein the conductive metal layer has a thickness of 0.5 to 10 μm. [Claim 9] The electrode according to claim 1, wherein the lithium metal layer has a thickness of 5 to 50 μm. [Claim 10] A lithium secondary battery comprising the electrode for a lithium secondary battery according to any one of claims 1 to 9. [Claim 11] Preparing a polymer film having a pattern formed on one surface in which a plurality of hemispherical protrusions having a diameter of 5 to 50 μm are regularly arranged; Forming a conductive metal layer by electroless plating a conductive metal precursor on the pattern of the polymer film; And forming a lithium metal layer by electrolytic plating a lithium metal on the conductive metal layer. [Claim 12] The method of claim 11, wherein the conductive metal precursor is Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge , Sb, Pb, In or Zn sulfate, halide, nitrate, or at least one selected from the group consisting of hydroxide, a method of manufacturing an electrode for a lithium secondary battery. [Claim 13] The method of claim 11, wherein the electroless plating step uses at least one selected from the group consisting of glycine, formaldehyde, hydrazine, and citric acid as a reducing agent. [Claim 14] The method of claim 11, wherein the conductive metal layer is formed to a thickness of 0.5 to 10 μm. [Claim 15] The method of claim 11, wherein the lithium metal layer is formed to a thickness of 5 to 50 μm.