Art [1] Mutual citations and related applications [2] This application claims the benefit of priority based on the date of July 15, Korea Patent Application No. 10-2016-0089735 and 07 years May 13, 2017 Date of Korea Patent Application No. 10-2017-0089109, 2016, and of the Korea Patent Application everything described in the literature are included as part of the specification. [3] Art [4] The present invention relates to a negative electrode and a secondary battery including the same, the negative electrode current collector; Disposed on the current collector to a first active material layer includes at least one or more concave indentations towards the current collector; The stress relief portion disposed in the cavity; And disposed on the first electrode coating portion may include a second active material layer spaced apart from the current collector. BACKGROUND [5] And the demand for the use of alternative energy and clean energy increased due to the rapid increase in the use of fossil fuels, is the development, storage areas are areas that have been studied most actively in that part using an electrochemical reaction. [6] Typical examples include a secondary battery of the present electrochemical device using such an electrochemical energy, and the trend that more and more expanding its area of ​​use. Recently, represents a and rapidly increasing, and such a secondary battery of high energy density and operating potential demand for secondary batteries as an energy source, as a portable computer, a portable telephone, an increase technology development and need for a portable apparatus such as a camera cycle life the long self-discharge rate is a number of studies been performed for low lithium secondary batteries, are also commercially available and widely used. [7] In general, the secondary battery is composed of a positive electrode, a negative electrode, an electrolyte, and a separator, the first lithium ions emitted from the positive electrode active material by the first charge is inserted into the anode active material such as carbon particles, while reciprocating the positive electrode such as to be desorbed back during discharge because it serves to transmit energy it is possible to charge and discharge. [8] In order to be of high energy density battery manufacture, the battery capacity must be large in the negative electrode. In a negative electrode active material and using the Group 14, such as transition metals and their oxides of the group 15 in addition to the graphite. However, in case of the active material layer containing the material, since it is applied to a volume of over-expansion stress it is excessive the electrode collector and active material layer in accordance with charge and discharge, is eliminated or the peeling of the active material layer of the active material particles occurred. As a result, the battery life or reduced, may cause a problem that the stability is lowered. [9] In order to solve the problems of the desorption or stripping, using a high adhesion or binder, but a way to put the other additives is introduced, a situation does not remove an excessive stress applied to the electrode current collector and the active material layer. [10] Therefore, a situation that is required to have a cathode capable of maintaining a high capacity, relax the stress applied to the electrode current collector and the active material layer. Detailed Description of the Invention SUMMARY [11] One object of the present invention to provide a negative electrode capable of maintaining a high capacity, relax the stress applied to the electrode current collector and the active material layer. Problem solving means [12] One embodiment of the invention the current collector; Disposed on the current collector to a first active material layer includes at least one or more concave indentations towards the current collector; The stress relief portion disposed in the cavity; And disposed on the first active material layer provides a negative electrode comprising a second electrode active material layer is separated from the current collector. [13] Another embodiment of the present invention provides a secondary battery including the cathode. Effects of the Invention [14] A negative electrode in accordance with one embodiment of the present invention uses a transition metal, an alloy thereof, and a transition metal such as an alloy of each oxide to the active material, a high-capacity battery can be obtained. In addition, the stress relief portion is disposed in the recess of the first active material layer, since the stress applied to the collector and the active material layer can be alleviated, and peeling of the active material layer and the desorption of the active material particles can be prevented. Brief Description of the Drawings [15] 1 is a cross-sectional view of a cathode according to an embodiment of the present invention. [16] Figure 2 is a schematic cross-sectional view of a cathode according to another embodiment of the present invention. [17] Figure 3 is a cross-sectional view of a cathode according to another embodiment of the present invention. [18] Figure 4 is a schematic cross-sectional view of a cathode according to another embodiment of the present invention. Mode for the Invention [19] Hereinafter, the present invention will be described to assist understanding of the present invention in more detail. [20] That the present disclosure and should not be construed as limited to the term general and dictionary meanings used in the claims, the inventor can adequately define terms to describe his own invention in the best way It interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle. [21] Used herein it is to be used to describe only the exemplary embodiments, and are not intended to limit the present invention. Expression in the singular number include a plural forms unless the context clearly indicates otherwise. [22] In this specification, "it comprise", "comprising is" or "gajida" and terms are exemplary of characteristics, numbers, steps, components or geotyiji to be a combination thereof specify the presence, of one or more other characteristics or more or of numbers, steps, components, or the presence or possibility of combinations thereof and are not intended to preclude. Also, in this specification, it is disposed "on", as well as when the two contact configuration, and spaced apart a predetermined interval to be understood as comprising a structure arranged in the vertical direction. [23] [24] When the negative electrode in accordance with one embodiment of the present invention, with reference to Figure 1, the current collector 100; The current collector being arranged on a (100) the first active material layer 110 that includes at least at least one recess (110a) recessed toward the body (100) the current collector; The strain relief disposed in the cavity (110a) unit 120; And it disposed on the first active material layer 110, and may be a negative electrode comprising a second electrode coating portion 130 is spaced apart from the body (100), the current collector. [25] The current collector is, as with a conductivity without causing chemical changes in the secondary battery, for example, copper, stainless steel, aluminum, nickel, titanium, sintered carbon, or carbon on the surface of aluminum, stainless steel, nickel, titanium, silver and the like to a surface treatment can be used as such. [26] The first active material layer may be disposed on the current collector, the first active material layer may be disposed on the current collector, and can be specifically disposed on one side or both sides of the current collector. The first active material layer may include the first electrode active material particles and a first binder. [27] The first active material particles may be graphite-based materials, transition metals, transition metal oxides, transition metal alloy, an oxide of a transition metal alloy, and a transition metal complex containing at least one active material particle selected from the group consisting of. The graphite-based material may be at least one selected from the group consisting of artificial graphite, natural graphite, graphitized carbon fiber and graphitized mesocarbon microbeads. The transition metal may be a Group 14 or Group 15 transition metal, and may be any one of, specifically the transition metal is a silicon-based materials, tin based materials, either of germanium based materials. The transition metal contained in the transition metal oxide, transition metal alloy, an oxide of a transition metal alloy, and a transition metal-containing composite material can be the above-described transition metal. For example, if the transition metal is a silicon-based material, wherein the first active material particles and the second active material particles are Si, SiOx (0