1]The invention flexible electrode, a secondary battery as its production method and containing the same, specifically a high load while implementing this flexibility the flexible electrode, relates to a process for their preparation, and a secondary battery including the same. [2]This application claims the priority based on the Korea Patent Application No. 10-2017-0063010, filed on May 22, 2017, and all contents disclosed in the specification and drawings of that application are incorporated in this application. BACKGROUND [3] And rechargeable, and the rapidly increasing demand for compact and high capacity secondary battery is possible, as the technical development and demand for mobile devices increases. In addition, a lithium secondary battery having high energy density and voltage of the secondary batteries are commercially available and widely used. [4] The lithium secondary battery consists of a collector an electrode which the active material is applied to, that is, an anode and a cathode porosity of the structure in which the separation membrane of the electrolyte is impregnated, including a lithium salt in an electrode assembly disposed between the electrode foils ( foil) is generally prepared by coating and drying a slurry containing the active material in the form of a current collector, the binder and the conductive material or the like, and forming an active material layer after the step of rolling (pressing). [5] In recent years, and for the high capacity of the battery to increase the density of the active material electrode layer and the porosity, that is to obtain the value of the air gap is reduced increasing demand for loading electrode (high loading). In order to implement the high-load electrode there is generally the electrode layer becomes thicker, a thick electrode layer is easily broken electrode to small bending not only difficult to distribute evenly to the active material, binder and conductive material. [6] Therefore, there are increasing cases to utilize the entire three-dimensional network in the form of a porous electrode in the house in order to produce a favorable bending while implementing a high loading. [7] For example, Korea Patent Laid-Open Publication No. 10-2005-0092676 discloses a foamed metal (foamed metal), a metal fiber (metal fiber), the porous metal (porous metal), the etched metal (etched metal), the back and forth uneven metallized (metal ) re-challenge of the electrode active material in the total porosity of the three-dimensional house, such as pores, in which a slurry prepared by filling with a binder and an organic solvent was prepared in the following, by pressing with a roll press or the like after drying the electrode. [8] As described above, when, using a total porosity house to form an active material layer in a conventional way through the coating, drying and rolling processes of the active material slurry, and a total porosity home stretched in the course of rolling, the problem is the inner material of the active material, such as cracking and it is, thereby it is difficult to perform rolling at a high pressure, which will be evenly filled with the active material in the total thickness of the porous home also was not easy. Detailed Description of the Invention SUMMARY [9] The present invention for solving the above problems, one object of the present invention to provide a flexible electrode is excellent in flexibility while implementing a high loading. [10] Another object of the invention is to provide a method for producing the electrode. [11] A further object of the present invention is to provide a lithium secondary battery including the electrode. Problem solving means [12] According to an aspect of the invention, (i) forming an active material coating layer by coating and drying a plurality of the solids content is 30 to 50% of active material slurry to the total porosity having a pore house; (Ii) the step of solid content to form a more active material coating layer by coating and drying the active material coating layer formed in the active material slurry 30 to 50% in the previous step; And (iii) wherein step (ii) the n times (1≤n≤5) repeated by including the step of forming a multi-layer coating of the active material, the electrode active material layer on the pore inside and surfaces of the said porous house rolling process the manufacturing method of the flexible electrode to form without, is provided. [13] In the above method, steps (ii) and step (iii) may be carried out under reduced pressure of from -1 to -0.01 MPa, preferably from -0.1 MPa. [14] In addition, the porous current collector has a porosity of 60% or more, may have a thickness of from 100 to 400㎛. [15] The porous current collector may be selected from pomhyeong, web-type, the felt (felt) and a mesh-type, stainless steel, aluminum, nickel, titanium, sintered carbon, copper; Carbon, nickel, titanium or silver on the surface-treated stainless steel; Aluminum-cadmium alloy; The surface-treated with a conductive material, a non-conductive polymer; Of a metal, such as aluminum, surface treatment non-conductive polymer; And it may be formed of any one material selected from a conductive polymer. [16] The first active material coating layer may be formed of a porous current collector thickness level, and the second active material coating layer may have a thickness of not more than 50% of the thickness of the porous house. [17] According to another aspect of the invention, the porous current collectors, and a flexible electrode comprising an electrode active material layer formed on the pore inside and surfaces of the said porous home, the porous current collector with the thickness ratio of the flexible electrode having a plurality of pores It is 1: 1.05 to 1: 1.2 is a flexible electrode is provided. [18] Further, the porous current collector with the thickness ratio of the flexible electrode is 1: 1.05 to 1: 1.1 or 1: 1.05 to 1: 1.08, or 1: 1.08 to 1: 1.2 may be. [19] In the flexible electrode, the pores present in the porous entire house has an average diameter of 5 to 100㎛, the electrode active material layer has been filled the pores of the porous entire house, the loading amount of the active material from 3.0 to 20.0 mAh / cm 2 , and the total porosity of the electrode including the porous current collector and the electrode active material layer may be 10 to 50%. [20] The porosity of the entire electrode including the porous current collector and the electrode active material layer may preferably be 20 to 40% range. [21] The flexible electrode in performing the bending test using a bar (bar) of the 15R (diameter 30mm), the flexibility is excellent in the bending process, so that cracks occur or the active material when repeating more than 1000 desorption. [22] In accordance with another aspect of the invention is a lithium secondary battery comprising the flexible electrode is provided. Effects of the Invention [23] According to the invention, and uniformly filled with the coating and drying of the porous lower house throughout the active material slurry had a solids content of active material in high density in the number of pores of the porous full house through a series of steps to perform one, rolling (non- press) by decreasing the porosity of the electrode without a step, it is possible to provide the flexible electrode of a high load. Brief Description of the Drawings [24] Figure 1 is a photomicrograph showing the three-dimensional porous collector used in the fine pores of an embodiment of the present invention. [25] Figure 2 schematically shows the manufacturing process of the flexible electrode in accordance with one embodiment of the invention. [26] 3a and 3b shows a charge-discharge curve of a battery including the electrode prepared in each of Example 2 and Comparative Example 1. [27] Figure 4 shows the Example 2 and Comparative Example 4, the discharge rate (C-rate) of the battery including the electrode prepared from. Best Mode for Carrying Out the Invention [28] Hereinafter, the specification and are should not be construed as limited to the term general and dictionary meanings used in the claims, the inventor has properly define terms to describe his own invention in the best way on the basis of the principle that can be interpreted based on the meanings and concepts corresponding to technical aspects of the present invention. [29] One embodiment of the present invention to be, the production process related to the manufacturing method of the flexible electrode, characterized in that for forming, without the rolling process the electrode coating on the pore interior and a surface of a porous house comprising the steps of specifically can: [30] (I) forming a coating and drying the coating layer and active material, a plurality of the solids content is 30 to 50% of active material slurry to the total porosity having a pore house; [31] (Ii) the step of solid content to form a more active material coating layer by coating and drying the active material coating layer formed in the active material slurry 30 to 50% in the previous step; And [32] (Iii) forming a multi-layer coating of the active material to more repeating n times (1≤n≤5) wherein step (ii). [33] According to the invention, the solid content and the viscosity is repeatedly coating and drying a total porosity house with a low active material slurry, it is possible to form the electrode active material layer with no rolling step in a multi-layer. [34] Figure 2 shows a series of steps of forming the flexible as schematically showing the manufacturing process of the electrode, e.g., four times coating the active material slurry of low solid content in the entire porous collector electrode active material layer according to an embodiment of the present invention; . [35] As shown in FIG. 2, 100 to a solids content in the entire porous collector having a thickness of 400㎛ is less than 50%, preferably from pores present on the collector if the primary coating and drying a slurry of the active material from 30 to 50% this part can be filled with active material. At this time, when the solid content exceeds 50%, as the viscosity is high and the flow of the slurry decreases, it is difficult that sufficient flow of the slurry into the pores of the collector there is a problem in that the slurry is left outside the pore. In addition, the coating layer may be formed of a porous current collector thickness level may be carried out in drying of the coating layer is at least 130 ℃ temperature for at least 15 minutes. Here, the "coating layer is porous home to that formed in a total thickness level" is the slurry will be filling the pores of the total porosity house high only during a coating layer corresponding to the entire thickness of the porous house formed, a larger coating layer than the total porosity home thickness meaning it can not be formed. [36] After the first coating, the first active material and back to active material slurry secondary coating and drying on the coating layer, the porous home pores of the electrode with the full, that is micheo the support pores of the porous current collector porosity, and the first active material coating layer of an addition filled sikimyeo again filled with the active material, where as the inside of the house total porosity the pore, but also the surface thereof can be coated. The solid content of the active material in the slurry during one In analogy to the active material coating layer, the second coating being less than 50%. On the other hand, the second active material coating layer is to be formed such that less than 50%, preferably 30 to 45% of the total thickness of the porous house, which is advantageous from the viewpoint of preventing an excessive increase in the thickness of the final electrode. Further, drying of the coating layer can be carried out at more than 130 ℃ temperature for at least 15 minutes. [37] In the same way, and repeating the coating and drying of the tertiary and quaternary, wherein the coating layer thickness is advantageous in terms of controlled thickness to the final electrode coating layer thickness that is thinner than before. That is, as the repetition of the coating is added to reduce the amount of slurry to be coated, so that the porosity of the electrode including the current collector and the electrode active material layer decreases. [38] In this way perform repetitive coating, as the pores of the porous electrodes comprises the entire house is fully uniformly filled with the active material, the porosity of the electrode is reduced. [39] According to the same manner as described above, in the conventional flexible electrode production method and to implement the loading electrode, three-dimensional case of coating and drying a high solids content of the slurry throughout the porous collector having the micropores active material a of the collector pore mothayeo fill sufficiently, to go through a rolling process to increase the active material density, the active material density desired failure to sufficiently perform a rolling process to overcome the shortcomings did not raise in order to prevent the entire house stretched in the process. [40] That is, with the flexible electrode manufacturing method according to an embodiment of the present invention without the need for the rolling process, the active material inside the whole porous collector having a three-dimensional fine-pore pore can be filled with a high density, porous home to implement the high-loaded electrode even if the total thickness of the thickened can be uniformly inserted into the active material in the pores of the porous full house in a sufficient amount. Further, according to the performing the iterative coating and the active material to the surface of the entire porous house it may be coated, where it is possible to ensure the flexibility of the end electrode, by adjusting the coating thickness. [41] [42] In the process according to one embodiment of the present invention, the step (ii) and step (iii) may take advantage of a vacuum process to the driving force (driving force) for moving the active material slurry, for example from -1 to -0.01 MPa, preferably It may increase the packing efficiency of the active material by inducing an additional movement of the active material in the pores of the porous full house uncoated when the coating former case of performing coating under a reduced pressure of -0.1 MPa. [43] [44] In the process according to one embodiment of the invention, the porous current collector is the average diameter of the type having 5 to 100㎛, preferably the fine pores of 35 to 50㎛ dimension, and examples thereof include pomhyeong, web-type, the felt (felt) it can be given a shape, a mesh shape or the like. Figure 1 is a photomicrograph showing the three-dimensional porous collector micropores of use in the present invention. [45] The diameter of the porous current collector 3D micropores can be measured by the method commonly used in the art, such as scanning electron microscopy (SEM) may be measured by the image observation, to satisfy the above average particle diameter range with when high loads are possible while still implementing the advantageous electrode produced in bending. For example, when the range of the average diameter of the fine pores are to be set in consideration of the size of the active material, in which the active material is not entering the inlet size it can be small, only a conductive material or a binder, if 5㎛ less than, greater than the active material has 100㎛ supporting the electrode material including the difficult may happen that their elimination. [46] Material of the entire house is porous stainless steel, aluminum, nickel, titanium, sintered carbon, copper; Carbon, nickel, titanium or silver on the surface-treated stainless steel; Aluminum-cadmium alloy; The surface-treated with a conductive material, a non-conductive polymer; Of a metal, such as aluminum, surface treatment non-conductive polymer; Or it may be a conductive polymer. In particular, there is an aluminum-coated polyethylene terephthalate (PET) felt in terms of flexibility can be preferably used in the present invention. [47] The thickness of the porous collector and is not particularly limited as long as consistent with the purposes of implementing the loaded electrode, for example, it may be 100 to 400㎛, preferably 100 to 140㎛. Further, the bending of the electrode when the porosity of all the porous collector is more than 60%, preferably 70 to 80% range, that is advantageous in flexibility. [48] [49] On the other hand, the active material slurry used in the coating in each step of the manufacturing method according to the invention and dispersing the active material in a solvent, can be obtained by mixing and stirring a binder, a conductive material or the like as needed, a slurry as mentioned above is the solid content is preferably less than 50%. [50] Coating method of the active material slurry is not particularly limited if the method commonly used in the art. For example, a method such as coating, Meyer bar coating method, gravure coating method, dip coating method, spray coating method may be used with the slot die. [51] The active material when the electrode according to the present invention is used as the positive electrode, LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4 , LiFePO 4 , and LiNi 1 -xy- z Co x M1 y M2 z O 2(M1 and M2 are each independently selected from Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, at least one selected from the group consisting of Mg and Mo, x, y and z are oxides independently of each other as the atomic fraction of the element composition 0 = x <0.5, 0≤ = y <0.5, 0≤ = z <0.5, 0 [119] Good: Tally generation of cracks or the active material in more than one thousand times the bending recovery [120] Medium: Tally generation of cracks or the active material in less than 500 times to 1,000 times the bending recovery [121] Bad: desorption occurrence of cracks or the active material in less than 500 times the bending recovery [122] [123] TABLE 1 Example 1 Example 2 * Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Whether using porous collector O O O O X O The solid content 40% 40% 65% 65% 65% 65% Whether performing rolling Non-Rolling Non-Rolling Rolling Rolling Rolling Non-Rolling Porous home and compare the total thickness of the final electrode 120㎛:130㎛(1:1.08) 120㎛:130㎛(1:1.08) 120㎛:120㎛(1:1) No measurement (stretching occurs) - 70㎛:105㎛(1:1.5) Porosity (%) 35 30 70 30 30 40 Active material loading amount (mAh / cm 2 ) 4.5 5 2.0 Not measured 5 5 flexibility good good good middle Bad Bad * Additional pressure conditions in the slurry coating [124] As can be seen in Table 1, Examples 1 to 2 lower porosity of the electrode is from 10 to 50% comprising an electrode active material layer formed by coating a low solids content of the slurry on the entire porous house several times in accordance with the invention to not only meet the high loading implement electrode, flexibility was also excellent. In particular, the embodiment of Example 2, the electrode was further increase the loading amount of the electrode active material according to a further lowered porosity according to the application of the reduced pressure condition at the time of forming multi-layer coating. On the other hand, the electrode of Comparative Example 1 is a high-solids slurry to the total porosity house but it is produced by rolling after a single coating at a relatively low pressure flexibility is obtained, and depending on the porosity of the hard coals of the loading implement electrode. [125] Electrode of Comparative Example 2, the stress (stress) when, the total porosity house the stretching was applied to bending were the shape is modified according to the application of high pressure as conventional rolling step after a single coating with high solid content of the slurry throughout the porous house it was difficult to endure. [126] Reference electrode of Example 3 is prepared in the whole house Al foil in a conventional manner, by a process apyeop porosity did not satisfy the flexibility can not withstand the stress was applied, when the bend, but controlled. [127] Then, the reference electrode of Example 4 using the high solids slurry, and the porous current collector with the end electrode is 1 thickness ratio of: were to, bad flexibility to increase the thickness of the electrode coating as exceeding 1.2, on the end collector surface It occurred the peeling of the electrode coating layer. [128] [129] Experimental Example 3: discharge capacity test [130] Example 2 and Comparative Example 1 emitted another the electrode produced in then used as an anode and, via a polyethylene separator between the lithium electrode anode and a counter electrode, ethylene carbonate (EC), ethyl methyl carbonate (DEC) 50: in a solvent mixture in a volume ratio of 50 1M LiPF 6 to the injection of the molten electrolyte was prepared a coin-type half cell. [131] Until the voltage of the half-cell prepared in a current of 0.2C-rate in this 4.45V constant current (CC) charging, and then a constant voltage (CV) mode at 4.45V while maintaining the cut at a current of 0.05C-rate - It was off (cut-off). It was allowed to stand for 10 minutes and then discharged at a constant current (CC) of 0.2C, and cut-rate from 3V - then off (cut-off), by measuring the battery capacity. The results are shown in Table 2 and Figures 3a and 3b. [132] TABLE 2 Example 2 Comparative Example 1 Discharging capacity (mAh / g) 175 130 [133] And Table 2, were superior to Example 2, the discharge capacity of the half-cell electrode in Comparative Example 1 containing the As can be seen in the charge-discharge curves of Figures 3a and 3b. That is, in the case of Comparative Example 1 exhibited a lower capacity than design capacity (175mAh / g), which the total porosity home as to avoid problems caused by a total porosity home stretched during the rolling process of the electrode slightly adjusting the rolling degree within the pore in contact between the entire active material with water, a conductive material and a home made rather weak, it is believed that the decreased electrode capacity per unit area. [134] [135] Experimental Example 4: discharge rate (C-rate) test [136] In order to evaluate the battery performance of the porous collector and the thickness ratio of the final electrode, the second embodiment and the comparative example the electrode prepared in the Example 3 by the same manner as described in using four coin-type was prepared for half-cell , by performing the charging and discharging it is shown the discharge rate (C-rate) for each cell in FIG. [137] As can be seen in Figure 4, Example 2 and Comparative Example electrode 4 are even with the same loading amount, the thickness ratio of the porous current collector and the end electrode is 1: Examples satisfying the range of 1.2: 1.05 to 1 2 of Comparative example 4, the electrode outside of the half-cell ratio using the thickness of the electrode (with a thickness ratio of 1: 5) exhibited higher discharge rate than the battery (s) used. Claims [Claim 1](I) forming a coating and drying the coating layer and active material, a plurality of the solids content is 30 to 50% of active material slurry to the total porosity having a pore house; (Ii) the step of solid content to form a more active material coating layer by coating and drying the active material coating layer formed in the active material slurry 30 to 50% in the previous step; And (iii) wherein step (ii) the n times (1≤n≤5) repeated by including the step of forming a multi-layer coating of the active material, the electrode active material layer on the pore inside and surfaces of the said porous house rolling process the method of the flexible electrode to form no. [Claim 2] The method of claim 1, wherein the method for manufacturing a flexible electrode that performs under a reduced pressure of said step (ii) and step (iii) -1 to -0.01 MPa. [Claim 3] The method of claim 1, wherein the porous current collector is a flexible method for producing an electrode having a thickness of 100 to 400㎛. [Claim 4] The method of claim 1, wherein the porous collector is method of producing a flexible electrode having a porosity of 60% or more. [Claim 5] The method of claim 1, wherein the first active material coating layer manufacturing method of the flexible electrode is formed of a porous current collector thickness level. [Claim 6] The method of claim 1, wherein the second active material coating layer manufacturing method of the flexible electrode which is formed to a thickness of not more than 50% of the thickness of the porous house. [Claim 7] The method of claim 1, wherein the porous current collector is a flexible electrode method is selected from the pomhyeong, web-type, the felt (felt) type and a mesh type. [Claim 8] The method of claim 1, wherein the porous current collector is stainless steel, aluminum, nickel, titanium, sintered carbon, copper; Carbon, nickel, titanium or silver on the surface-treated stainless steel; Aluminum-cadmium alloy; The surface-treated with a conductive material, a non-conductive polymer; Of a metal, such as aluminum, surface treatment non-conductive polymer; And a process for producing a flexible electrode made of any one material selected from a conductive polymer. [Claim 9] Total porosity collector having a plurality of pores, and a flexible electrode comprising an electrode active material layer formed on the pore inside and surfaces of the said porous home, the porous current collector with the thickness ratio of the flexible electrode is 1: 1.05 to 1: 1.2 the flexible electrode. [Claim 10] 10. The method of claim 9, wherein the porous current collector with the thickness ratio of the flexible electrode is 1: 1.05 to 1: 1.1, the flexible electrode. [Claim 11] The method of claim 9, wherein pores present in the porous entire house has an average diameter of 5 to 100㎛, the electrode active material layer has been filled the pores of the porous entire house, the loading amount of the active material from 3.0 to 20.0 mAh / cm 2 , and the porous current collector and the flexible electrode has a porosity of the whole electrode including the electrode active material layers 10 to 50%. [Claim 12] Of claim 9 in which said porous collector and the flexible electrode to the overall porosity of the electrode including the electrode active material layer characterized in that 20 to 40%. [Claim 13] 10. The method of claim 9, at the time of bending test performed using a bar (bar) of the 15R (diameter 30mm) on the flexible electrode, a flexible, characterized in that the bending process takes place is of a crack or the active material when repeating more than 1000 Tally electrode. [Claim 14] Claim 9 through Claim 13, wherein the lithium secondary battery comprising a flexible electrode according to any one of Items.