Title of the invention: Electrode for lithium secondary battery and lithium secondary battery including the same Technical field [One] This application claims priority based on Korean Patent Application No. 10-2018-0092536 filed on August 8, 2018. The present invention relates to an electrode for a lithium secondary battery and a lithium secondary battery including the same, and more particularly, to an electrode for a lithium secondary battery capable of improving nail penetration safety, and a lithium secondary battery including the same. [2] Background [3] Lithium secondary batteries for automobiles that are currently being developed require high energy density and high output. However, this development direction reduces the safety of the battery. In addition, as the demand for lithium secondary batteries is increasing, the demand for safety is increasing. Among them, if the battery pack is penetrated due to external impact or external deformation, it may cause an explosion of a passive device such as an automobile. As such, penetration safety is recognized as an important evaluation item among the safety evaluation items of lithium secondary batteries for automobiles, and several attempts have been made to improve this. [4] In particular, it is known that the explosion caused by penetration of the nail occurs in local IR-heating due to a short-circuit current caused by contact between the nail and the electrode current collector or the electrode active material layer and the electrode current collector. [5] In order to solve such nail penetration safety, it is important to increase the interface resistance between the electrode active material layer and the electrode current collector. Because, due to the short circuit caused by the nail penetration, a high-rate current flows, and at this time, electrons move from the electrode active material to the electrode current collector and the nail. By increasing the resistance in this connection, the short circuit current of the nail penetration is reduced, IR -Because it can reduce heating. [6] Detailed description of the invention Technical challenge [7] Accordingly, an object to be solved by the present invention is to provide an electrode for a lithium secondary battery capable of improving nail penetration safety, and a lithium secondary battery including the same. [8] Means of solving the task [9] A first aspect of the present invention is an electrode current collector; A primer coating layer positioned on at least one surface of the electrode current collector and including a binder and a conductive material; And an electrode active material layer positioned on the primer coating layer, wherein the binder includes a repeating unit derived from vinylidene fluoride (VDF) and a repeating unit derived from hexafluoropropylene (HFP). -co-hexafluoropropylene)), and the content of HFP-derived repeating units in the PVDF-HFP is 2% to 13% by weight, and the primer coating layer has a thickness of 0.8 μm to 5 μm. will be. [10] In the second aspect of the present invention, in the first aspect, the primer coating layer includes the binder in an amount of 10 parts by weight to 80 parts by weight based on 100 parts by weight of a conductive material. [11] In the third aspect of the present invention, in the second aspect, the primer coating layer includes the binder in an amount of 35 to 65 parts by weight based on 100 parts by weight of a conductive material. [12] In a fourth aspect of the present invention, in any one of the first to third aspects, the content of the HFP-derived repeating unit in the PVDF-HFP polymer is 3% to 10% by weight. [13] A fifth aspect of the present invention is that in any one of the first to fourth aspects, the thickness of the primer coating layer is 1 μm to 2 μm. [14] In a sixth aspect of the present invention, in any one of the first to fifth aspects, the thickness of the primer coating layer is 0.01 to 0.05 times the thickness of the electrode active material layer. [15] In a seventh aspect of the present invention, in the sixth aspect, the thickness of the primer coating layer is 0.01 to 0.03 times the thickness of the electrode active material layer. [16] In an eighth aspect of the present invention, according to any one of the first to seventh aspects, in one embodiment of the present invention, the binder has a content of PVDF-HFP of 50% by weight or more relative to 100% by weight of the binder. [17] In a ninth aspect of the present invention, in any one of the first to seventh aspects, the electrode active material layer includes an electrode binder, and PVDF-HFP is 5% by weight or less relative to 100% by weight of the electrode binder. [18] According to another aspect of the present invention, there is provided a lithium secondary battery comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, wherein the positive electrode or the negative electrode is an electrode as described above. [19] Effects of the Invention [20] According to an embodiment of the present invention, a primer coating layer including a PVDF-HFP binder and a conductive material is provided between the electrode current collector and the electrode active material layer, so that the interface resistance between the electrode current collector and the electrode active material layer can be increased, Even if nail penetration occurs, it is possible to reduce the amount of short-circuit current flowing through the nail, ultimately improving the safety of the battery. [21] Furthermore, the HFP contained in the PVDF-HFP can improve the thermal stability of the binder, thereby reducing the temperature inside the battery due to IR-heating. [22] Brief description of the drawing [23] The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the content of the above-described invention, so the present invention is limited to the matters described in such drawings. It is limited and should not be interpreted. [24] 1 schematically shows the structure of an electrode for a lithium secondary battery according to an embodiment of the present invention. Mode for carrying out the invention [25] Hereinafter, the present invention will be described in detail with reference to the drawings. The terms or words used in the specification and claims should not be construed as 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 [26] Therefore, the embodiments described in the present specification and the configurations described in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, and thus various It should be understood that there may be equivalents and variations. [27] [28] An embodiment of the present invention, as can be seen in Figure 1, the electrode current collector 10; A primer coating layer 20 positioned on at least one surface of the electrode current collector and including a binder and a conductive material; And an electrode active material layer 30 positioned on the primer coating layer. [29] In one embodiment of the present invention, the electrode current collector 10 is not particularly limited as long as it has conductivity without causing chemical changes to the battery, for example, copper, stainless steel, aluminum, nickel, titanium, The surface of calcined carbon, copper or stainless steel is surface-treated with carbon, nickel, titanium, silver, etc., aluminum-cadmium alloy, and the like may be used. [30] The thickness of the current collector is not particularly limited, but may have a thickness of 3 μm to 500 μm, which is typically applied. [31] [32] In one embodiment of the present invention, the primer coating layer 20 is PVDF-HFP (Poly(vinylidene fluoride-) containing repeating units derived from vinylidene fluoride (VDF) and repeating units derived from hexafluoropropylene (HFP) as a binder. co-hexafluoropropylene)). In one embodiment of the present invention, the content of PVDF-HFP in 100% by weight of the binder may be 50% by weight or more, 80% by weight or more, 90% by weight or more, or 99% by weight or more. [33] The HFP contained in the PVDF-HFP has a property of increasing absorption of an organic electrolyte, and thus the degree of swelling of the PVDF-HFP binder can be adjusted according to the content of HFP. That is, as the content of HFP increases, the swelling of the PVDF-HFP binder increases. [34] However, when PVDF-HFP binder is used as a binder included in the electrode active material layer, the cycle characteristics decrease and the swelling of the battery increases, which may cause deterioration of battery performance. Since it contains a PVDF-HFP binder, the aforementioned side effects are not a problem. [35] That is, the primer coating layer including the PVDF-HFP binder is provided between the electrode current collector and the electrode active material layer, so that the interface resistance between the electrode current collector and the electrode active material layer has little effect on the swelling of the entire electrode. I can. Accordingly, even if the nail penetration occurs, the amount of short-circuit current flowing through the nail can be reduced, and ultimately the safety of the battery can be improved. [36] In addition, the HFP can improve the thermal stability of the binder, thereby reducing the temperature inside the battery due to IR-heating. [37] For this reason, in one embodiment of the present invention, the HFP-derived repeating unit in the primer coating layer between the electrode current collector and the electrode active material layer is 2% by weight to 13% by weight, specifically 3% by weight to 10% by weight, more specifically The PVDF-HFP binder contained in an amount of 3% to 7% by weight was used. When the content of the HFP-derived repeating unit is less than 2% by weight, the swelling of the binder due to HFP is insufficient, thermal stability is not sufficiently secured, and when it exceeds 13% by weight, the adhesion, which is the main function of the binder, is reduced, Due to excessive swelling, the increase in resistance of the primer coating layer becomes too large, and the lifespan characteristics may be deteriorated. [38] In the present invention, the weight content of the repeating unit may be measured using 1 H-NMR, which is a Varian 500 model . [39] In addition, the primer coating layer should be formed to have a very thin thickness compared to the electrode active material layer so that there is little effect on the swelling of the entire electrode. That is, the thickness of the primer coating layer is preferably 0.8 µm to 5 µm, specifically 1 µm to 2 µm, and more specifically 1 µm to 1.5 µm. If the thickness of the primer coating layer is less than 0.8 μm, the resistance increase and swelling increase effect is insufficient, and when the thickness of the primer coating layer is more than 10 μm, the resistance increase and swelling are excessive, resulting in a problem of deteriorating life characteristics. [40] In particular, the thickness of the primer coating layer is preferably adjusted to be 0.01 to 0.05 times, specifically 0.01 to 0.03 times the thickness of the electrode active material layer. [41] On the other hand, the primer coating layer is the PVDF-HFP binder based on 100 parts by weight of the conductive material 10 parts by weight to 80 parts by weight, specifically 35 to 65 parts by weight, more specifically 40 to 50 parts by weight It can be included in content. When the PVDF-HFP binder satisfies the above content range, it is advantageous in that it can provide a safety effect by reducing the amount of short-circuit current when penetrating the battery while maintaining good electrode adhesion, which is the original purpose of the binder. [42] The primer coating layer may be formed by applying a slurry obtained by dispersing the PVDF-HFP binder and a conductive material as described above in a solvent on at least one surface of an electrode current collector. [43] In this case, the conductive material may be a conductive material commonly used in the electrode active material layer, and may include graphite such as natural graphite or artificial graphite; Carbon blacks such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and thermal black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskers such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; It may include one or a mixture of two or more selected from conductive materials such as polyphenylene derivatives. [44] [45] In one embodiment of the present invention, the electrode active material layer 30 may be formed by applying an electrode slurry obtained by dispersing an active material, an electrode binder, and a conductive material in a solvent on the primer coating layer 20, followed by drying and rolling. have. [46] At this time, when the electrode for a lithium secondary battery according to an embodiment of the present invention is a positive electrode, any material that can be used as a positive electrode active material for a lithium secondary battery may be used as an active material. For example, layered compounds such as lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), or compounds substituted with one or more transition metals; Lithium manganese oxides such as formula Li 1+x Mn 2-x O 4 (wherein x is 0 to 0.33), LiMnO 3 , LiMn 2 O 3 , and LiMnO 2 ; Lithium copper oxide (Li 2 CuO 2 );LiV 3 O 8 ,LiFe 3 O 4 ,V 2 O 5Vanadium oxides such as Cu 2 V 2 O 7 ; Ni site-type lithium nickel oxide represented by the formula 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); Formula LiMn 2 - x M x O 2 (where M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 ~ 0.1), Li 2 Mn 3 MO 8 (where M = Fe, Co, Ni, Cu or Zn) or Li a Ni x Co y Mn z O Lithium manganese composite oxide represented by 2 (0.5 [88] A total of 5 samples were prepared for the manufactured battery, each sample was buffered under the condition of 4.25V, and then a nail with a diameter of 6mm made of iron was placed from the top using a nail penetration tester (KSG-103, Hard Tester Co., Ltd.). Penetrated in the center of the cell At this time, the penetration speed of the nail was kept constant at 12m/min. [89] Whether or not to pass the nail penetration safety for a total of five samples was determined according to the following evaluation criteria, and the number of samples passed is shown in Table 1. [90] [91] Pass: When a nail penetrates, even smog is observed, but no ignition occurs. [92] Failure: Immediately ignites when piercing a nail or delayed ignition within 5 minutes after penetration [93] (Ignition: Observe whether or not sparks or flames are generated due to related pipes) [94] [95] [96] Charging/discharging was performed by applying a current corresponding to 1C (40Ah) in the range of 3 to 4.25V to the manufactured battery. After the charging and discharging was performed in a total of 100 cycles, the capacity retention rate was calculated as follows, and the life characteristics were evaluated. [97] Capacity retention rate (%) = (discharge capacity after 100 cycles / discharge capacity at one cycle) × 100 [98] [99] [Table 1] Primer coating layer Nail penetration stability (passing quantity) Capacity retention rate (%) Content of HFP in PVDF-HFP binder (% by weight) Coating layer thickness (㎛) Example 1 3 1.2 2/5 98.1 Example 2 7 1.2 5/5 90.5 Comparative Example 1 0 1.2 0/5 98.8 Comparative Example 2 20 1.2 5/5 70.9 Comparative Example 3 3 0.3 0/5 98.9 Comparative Example 4 3 10 5/5 62.5 [100] [101] As can be seen in Table 1, PVDF-HFP having a content of HFP-derived repeating units of 2% to 13% by weight is used in the primer coating layer provided between the electrode current collector and the electrode active material layer, and the thickness of the coating layer is 0.8. Examples 1 and 2 satisfying the range of µm to 5 µm secured both nail penetration safety and excellent capacity retention. [102] On the other hand, in Comparative Examples 1 to 4, which did not satisfy all of the HFP content range and the thickness range of the primer coating layer as described above, any one of nail penetration safety and excellent capacity retention was poor. [103] [104] As described above, although the present invention has been described by a limited embodiment and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those of ordinary skill in the technical field to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equal range of the claims to be described in. Claims [Claim 1] Electrode current collector; A primer coating layer positioned on at least one surface of the electrode current collector and including a binder and a conductive material; And an electrode active material layer positioned on the primer coating layer, wherein the binder includes a repeating unit derived from vinylidene fluoride (VDF) and a repeating unit derived from hexafluoropropylene (HFP). -co-hexafluoropropylene)), the content of HFP-derived repeating units in the PVDF-HFP is 2% by weight to 13% by weight, and the primer coating layer has a thickness of 0.8 μm to 5 μm. [Claim 2] The electrode according to claim 1, wherein the primer coating layer comprises 10 parts by weight to 80 parts by weight of the binder based on 100 parts by weight of a conductive material. [Claim 3] The electrode according to claim 2, wherein the primer coating layer comprises 35 to 65 parts by weight of the binder based on 100 parts by weight of the conductive material. [Claim 4] The electrode for a lithium secondary battery according to claim 1, wherein the content of HFP-derived repeating units in the PVDF-HFP polymer is 3% by weight to 10% by weight. [Claim 5] The electrode for a lithium secondary battery according to claim 1, wherein the primer coating layer has a thickness of 1 µm to 2 µm. [Claim 6] The electrode of claim 1, wherein the primer coating layer has a thickness of 0.01 to 0.05 times the thickness of the electrode active material layer. [Claim 7] The electrode for a lithium secondary battery according to claim 6, wherein the primer coating layer has a thickness of 0.01 to 0.03 times the thickness of the electrode active material layer. [Claim 8] The electrode according to claim 1, wherein the binder has a content of PVDF-HFP of 50% by weight or more relative to 100% by weight of the binder. [Claim 9] The electrode for a lithium secondary battery according to claim 1, wherein the electrode active material layer includes an electrode binder, and PVDF-HFP is 5% by weight or less relative to 100% by weight of the electrode binder. [Claim 10] A lithium secondary battery comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, wherein the positive electrode or the negative electrode is an electrode for a lithium secondary battery according to any one of claims 1 to 9.