One]Cross Citation with Related Applications [2]This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0122963 filed on October 04, 2019, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification. [3] [4] technical field [5] The present invention includes an electrode active material layer, wherein the electrode active material layer includes an electrode active material and a conductive material, the conductive material comprising: a multi-walled carbon nanotube unit; and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, wherein the carbon nanotube structure is an electrode contained in an amount of 0.01% to 0.5% by weight in the electrode active material layer, and the same It relates to a secondary battery that background [6] Recently, as technology development and demand for mobile devices increase, the demand for batteries as an energy source is rapidly increasing, and accordingly, various researches on batteries capable of meeting various needs are being conducted. In particular, as a power source for such a device, a lithium secondary battery having a high energy density and excellent lifespan and cycle characteristics is being actively researched. [7] A lithium secondary battery includes a positive electrode including a positive electrode active material capable of insertion/desorption of lithium ions, a negative electrode including a negative electrode active material capable of insertion/deintercalation of lithium ions, and an electrode having a microporous separator interposed between the positive electrode and the negative electrode It means a battery in which a non-aqueous electrolyte containing lithium ions is included in the assembly. [8] On the other hand, since conductivity of the electrode cannot be ensured using only the electrode active material, there is a problem in that the resistance of the battery is too high, and the electrode typically includes an additional conductive material. Conventionally, dotted conductive materials such as carbon black have been mainly used, and linear conductive materials such as carbon nanotubes and carbon nanofibers have also been used to further improve conductivity to improve battery capacity. [9] Single-walled carbon nanotubes are one of the above linear conductive materials and improve conductivity in the electrode active material layer based on their elongated shape. Accordingly, in the prior art, an electrode slurry was prepared through a dispersion in which the single-walled carbon nanotubes were completely dispersed and present as single-walled carbon nanotube units one by one, and then an electrode active material layer was prepared through the electrode slurry. In the electrode active material layer, the single-walled carbon nanotube units are separated one by one. However, when charging and discharging of the battery are repeated, the surface of the single-walled carbon nanotube is damaged or the single-walled carbon nanotube is broken, so that it is difficult to maintain the conductive network in the electrode active material layer. Accordingly, the conductive network is blocked or reduced, which deteriorates the lifespan characteristics of the battery. [10] To this end, there is also a method of using multi-walled carbon nanotubes to ensure conductivity even when the surface of the carbon nanotubes is damaged. However, in the case of multi-walled carbon nanotubes, due to the structure formed by growing in units of nodes, they are cut to an excessively short length during the preparation of the dispersion, so there is a limit to improving the conductivity of the electrode. [11] Therefore, there is a need for a method capable of reducing the resistance of the electrode by introducing a new type of conductive material, and improving the input/output characteristics and high temperature lifespan characteristics of the battery. DETAILED DESCRIPTION OF THE INVENTION technical challenge [12] One problem to be solved by the present invention is to provide an electrode that has low resistance and can improve input/output characteristics and high-temperature lifespan characteristics of a battery. [13] Another object to be solved by the present invention is to provide a secondary battery including the electrode. means of solving the problem [14] According to an embodiment of the present invention, an electrode active material layer is included, wherein the electrode active material layer includes an electrode active material and a conductive material, and the conductive material includes: a multi-walled carbon nanotube unit; and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, wherein the carbon nanotube structure is included in an amount of 0.01% to 0.5% by weight in the electrode active material layer. . [15] According to another embodiment of the present invention, a secondary battery including the electrode is provided. Effects of the Invention [16] The electrode according to the present invention includes, as a conductive material, a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other together with a multi-walled carbon nanotube unit. can be maintained Specifically, since the carbon nanotube structure has a shape in which a plurality of single-walled carbon nanotube units are combined side by side, the shape can be maintained even when the battery is repeatedly charged and discharged, so that the conductive network can be smoothly maintained. In addition, since the carbon nanotube structure has a long length, it contributes to the formation of a long-length conductive network, and the multi-walled carbon nanotube unit is mainly disposed on the surface of the electrode active material and contributes to the formation of a short-length conductive network, so that the overall uniformity and a dense conductive network can be derived. Accordingly, the resistance of the electrode may be maintained at a low level, and the input/output characteristics and high temperature lifespan characteristics of the battery may be improved. Brief description of the drawing [17] 1 is an SEM photograph of a multi-walled carbon nanotube (A) and a carbon nanotube structure (B, C) used in an embodiment of the present invention. [18] 2 is a TEM photograph and SEM photograph of a carbon nanotube structure (A) used in Examples of the present invention and a single-walled carbon nanotube unit (B) used in Comparative Examples. [19] 3 is a SEM photograph of the electrode of Example 1 of the present invention. [20] 4 is a SEM photograph of the electrode of Comparative Example 2 of the present invention. [21] 5 is a SEM photograph of the electrode of Comparative Example 4 of the present invention. Modes for carrying out the invention [22] The terms or words used in this specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. Based on the principle that there is, it should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention. [23] The terminology used herein is used to describe exemplary embodiments only, and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. [24] In the present specification, terms such as "comprise", "comprising" or "have" are intended to designate the presence of an embodied feature, number, step, element, or a combination thereof, but one or more other features or It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, elements, or combinations thereof. [25] In this specification, "%" means % by weight unless otherwise explicitly indicated. [26] In this specification, "specific surface area" is measured by the BET method, and specifically, it can be calculated from the amount of nitrogen gas adsorbed under liquid nitrogen temperature (77 K) using BELSORP-mini II of BEL Japan. [27] In the present specification, the average particle diameter (D 50 ) may be defined as a particle diameter corresponding to 50% of the cumulative volume in the particle size distribution curve of the particles. The average particle diameter (D 50 ) may be measured using, for example, a laser diffraction method. In general, the laser diffraction method can measure a particle diameter of several mm from a submicron region, and can obtain results of high reproducibility and high resolution. [28] In the present invention, the single-walled carbon nanotube unit means a tube-shaped unit with one wall composed of carbon atoms, and the multi-walled carbon nanotube unit is a tube-shaped unit with multiple walls composed of carbon atoms in one tube. means [29] Hereinafter, the present invention will be specifically described. [30] [31] electrode [32] [33] The electrode according to the present invention includes an electrode active material layer, wherein the electrode active material layer includes an electrode active material and a conductive material, and the conductive material includes: a multi-walled carbon nanotube unit; and a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other, wherein the carbon nanotube structure may be included in an amount of 0.01 wt% to 0.5 wt% in the electrode active material layer. [34] [35] The electrode may include an electrode active material layer. The electrode may further include a current collector, in which case the electrode active material layer may be disposed on one or both surfaces of the current collector. [36] The current collector is not particularly limited as long as it is a material having conductivity without causing chemical change in the battery, for example, copper, stainless steel, aluminum, nickel, titanium, alloys thereof, carbon, nickel, titanium on their surface , silver or the like surface-treated or calcined carbon may be used. [37] The current collector may typically have a thickness of 3 μm to 500 μm, and may form fine irregularities on the surface of the current collector to strengthen the bonding force of the electrode active material. In addition, the electrode current collector may be used in various forms such as, for example, a film, a sheet, a foil, a net, a porous body, a foam, a nonwoven body, and the like. [38] [39] The electrode active material layer may include an electrode active material and a conductive material. [40] The electrode active material may be a positive active material or a negative active material generally used in the art, and the type is not particularly limited. [41] For example, a lithium oxide including lithium and one or more metals such as cobalt, manganese, nickel, or aluminum may be used as the positive electrode active material. More specifically, the lithium oxide is a lithium-manganese oxide (eg, LiMnO 2 , LiMn 2 O, etc.), a lithium-cobalt-based oxide (eg, LiCoO 2 etc.), a lithium-nickel-based oxide (eg, For example, LiNiO 2 etc.), lithium-nickel-manganese oxide (for example, LiNi 1-Y1 Mn Y1 O 2 (here, 0