Specification Title of the invention: additive, non-aqueous electrolyte for lithium secondary battery containing the same, and lithium secondary battery containing the same Technical field [One] Mutual citation with related applications [2] This application claims the benefit of priority based on Korean Patent Application No. 10-2017-0155471 filed on November 21, 2017, and all contents disclosed in the documents of the Korean patent application are included as part of this specification. [3] [4] Technical field [5] The present invention relates to an additive, a non-aqueous electrolyte for a lithium secondary battery containing the same, and a lithium secondary battery including the same, and more particularly, an additive capable of improving the life characteristics and high temperature storage performance of the lithium secondary battery, and a lithium secondary battery containing the same. It relates to a non-aqueous electrolyte for batteries and a lithium secondary battery including the same. [6] Background [7] As technology development and demand for mobile devices and electric vehicles increase, the demand for secondary batteries as an energy source is rapidly increasing, and among secondary batteries, they exhibit high energy density and operating potential, have a long cycle life, and have a low self-discharge rate. Lithium secondary batteries have been commercialized and widely used. [8] A lithium secondary battery is generally composed of a positive electrode, a negative electrode, and an electrolyte. The lithium secondary battery includes a LiLB (lithium ion liquid battery) using a liquid electrolyte, a lithium ion polymer battery (LiPB) using a gel polymer electrolyte, and an LPB using a solid polymer electrolyte according to the type of electrolyte used. lithium polymer battery). [9] Recently, as the application range of lithium secondary batteries has been expanded, there is a growing demand for lithium secondary batteries that can be safely charged even at high voltage while maintaining excellent cycle life characteristics even in harsh environments such as high temperature or low temperature environments, and high voltage charging. Meanwhile, in the case of a lithium secondary battery using a liquid electrolyte, when stored at a high temperature for a long time, an oxidation reaction of the electrolyte occurs on the surfaces of both electrodes, and gas is generated, thereby deforming the structure of the battery. [10] In order to solve the above problems, a method of suppressing the oxidation reaction of the electrolyte by adding a material capable of uniformly forming a film on the surface of both electrodes to the electrolyte has been proposed. There is a need to develop an electrolyte. [11] (Patent Document 0001) Japanese Laid-Open Patent Publication No. 2000-036332 [12] Detailed description of the invention Technical challenge [13] The present invention is to solve the above problems, and to provide an additive capable of remarkably improving high-temperature storage performance and life characteristics of a lithium secondary battery, a non-aqueous electrolyte solution for a lithium secondary battery, and a lithium secondary battery including the same. [14] Means of solving the task [15] In one aspect, the present invention provides an additive including at least one compound selected from the group consisting of compounds represented by the following Chemical Formulas 1 and 2. [16] [Formula 1] [17] [18] [Formula 2] [19] [20] In Formula 1 and Formula 2, [21] R 1 , R 2 , R 4 and R 5 are each independently hydrogen, a halogen group, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, [22] R 3 and R 6 are each independently a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, [23] n1 and n3 are each independently an integer of 0 or 1, [24] n2 is an integer of 1 or 2, [25] A is carbon or oxygen. [26] In another aspect, the present invention is a lithium salt; Organic solvent; And it provides a non-aqueous electrolyte for a lithium secondary battery comprising the additive. [27] In addition, the present invention is a positive electrode; cathode; A separator interposed between the anode and the cathode; And it provides a lithium secondary battery comprising the non-aqueous electrolyte for the lithium secondary battery. [28] Effects of the Invention [29] The additive according to the present invention can form a film on both surfaces of both electrodes by using a compound containing a functional group substituted with two different heteroatoms. [30] In addition, since the compound used in the additive according to the present invention has a constant decomposition potential, functional groups substituted with two different heteroatoms can be uniformly included in the film formed on the surface of both electrodes, thereby inhibiting the decomposition reaction of the electrolyte. Therefore, the battery life characteristics and high-temperature storage characteristics may be improved. [31] Best mode for carrying out the invention [32] Hereinafter, the present invention will be described in more detail to aid understanding of the present invention. [33] The terms or words used in the specification and claims should not be construed as being 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 there is. [34] The terms used in this specification are used only to describe exemplary embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. [35] In the present specification, terms such as "comprise", "include", or "have" are intended to designate the presence of implemented features, numbers, steps, elements, or a combination thereof, and one or more other features or It is to be understood that the possibility of the presence or addition of numbers, steps, components, or combinations thereof is not preliminarily excluded. [36] On the other hand, in the present invention, unless otherwise specified, "*" means the same or different atoms or a connected portion between the terminal portions of the formula. [37] [38] additive [39] The additive according to the present invention includes at least one compound selected from the group consisting of compounds represented by the following Chemical Formulas 1 and 2. [40] [Formula 1] [41] [42] [Formula 2] [43] [44] In Formula 1 and Formula 2, [45] R 1 , R 2 , R 4 and R 5 are each independently hydrogen, a halogen group, a substituted or unsubstituted alkyl group having 1 to 5 carbon atoms, or a substituted or unsubstituted alkoxy group having 1 to 5 carbon atoms, [46] R 3 and R 6 are each independently a substituted or unsubstituted alkylene group having 1 to 5 carbon atoms, [47] n1 and n3 are each independently an integer of 0 or 1, n2 is an integer of 1 or 2, and A is carbon or oxygen. [48] [49] Lithium secondary batteries using a liquid electrolyte have problems such as deformed battery structure due to an electrolyte oxidation reaction occurring on the surface of an electrode when stored at a high temperature for a long time. Accordingly, in order to solve this problem, research on a method of adding a material capable of forming a film on the surface of both electrodes or a material capable of suppressing an oxidation reaction to the electrolyte is being continued. [50] In general, during an initial charging process of a secondary battery, a solid electrolyte interphase (SEI) film is formed on the surfaces of a positive electrode and a negative electrode due to an electrolyte decomposition reaction. The SEI film has a property of passing lithium ions and blocking the movement of electrons, and serves as a protective film to prevent the electrolyte from continuously decomposing. However, the SEI film does not maintain its lasting performance, especially under high temperature conditions and may be destroyed. Thereafter, the electrolyte decomposition reaction cannot be suppressed by the SEI film during the subsequent charging and discharging process, and charges are irreversibly consumed, thereby reducing the reversible capacity of the battery, thereby deteriorating the performance of the battery. [51] Therefore, in recent years, research on a method of using two or more different additives together to easily form an SEI film on the surface of both electrodes and suppress the electrolyte decomposition reaction is actively being conducted. [52] For example, when a compound containing a sulfur atom (S), which is one of the hetero atoms, is used as an additive, it is possible to form an SEI film on the surface of the anode, as well as salt anion by the unshared electron pair of the sulfur atom. By stabilizing it, the electrolyte solution decomposition reaction can be suppressed. At this time, if a compound containing phosphorus atom (P) is used together as an additive, a film is formed on the surface of the negative electrode as well, and the oxidation reaction of the electrolyte can be suppressed. [53] However, two or more additives in which different hetero atoms are substituted have different electrochemical decomposition potentials for forming the SEI film. In this case, the SEI film may be formed on the surface of both electrodes, but the compounds contained in each additive included in the electrolyte may not be uniformly distributed in the film, and a non-uniform SEI film may be formed on the surfaces of both electrodes. In addition, even if a film is formed on the surfaces of both electrodes, since the SEI film is unstable and it is difficult to effectively suppress the decomposition reaction of the electrolyte, the high temperature storage performance of the battery may be deteriorated. [54] Accordingly, the inventors of the present invention invented to use a compound including all functional groups substituted with two different heteroatoms in one compound as an additive in order to solve the above problems. Specifically, the present inventors devised to use a compound containing both a functional group substituted with a phosphorus atom (P) and a functional group substituted with a sulfur atom (S) as an additive. When all functional groups substituted with different heteroatoms are included in one compound, an SEI film can be formed on the surface of both electrodes, and a functional group substituted with a phosphorus atom (P) and a sulfur atom (S) in the formed SEI film Since the compounds having the substituted functional group can be uniformly distributed, the oxidation reaction of the electrolyte can be effectively suppressed. [55] More specifically, the compound represented by Formula 1 may include at least one compound selected from the group consisting of compounds represented by the following Formulas 1-1 to 1-4. [56] [Formula 1-1] [57] [58] [Formula 1-2] [59] [60] [Formula 1-3] [61] [62] [Formula 1-4] [63] [64] [65] In particular, among the compounds represented by Formula 1, the compounds represented by Formulas 1-1 to 1-3 are substituted with a fluorine atom, which is a halogen, so that a film can be formed well on the surface of the electrode, and the conductivity of the formed film is also increased. I can. In addition, inorganic components such as lithium fluoride (LiF) are increased in the formed film, so that the film can be stably formed. [66] [67] In addition, the compound represented by Formula 2 may include at least one compound selected from the group consisting of compounds represented by Formulas 2-1 and 2-2 below. [68] [Formula 2-1] [69] [70] [Formula 2-2] [71] [72] On the other hand, the compounds represented by Formula 2 further contain a carbon-carbon double bond capable of forming a film on the surface of the negative electrode, so that the SEI film formation effect is excellent. [73] [74] Non-aqueous electrolyte for lithium secondary batteries [75] Next, the non-aqueous electrolyte solution for a lithium secondary battery according to the present invention will be described. [76] The non-aqueous electrolyte for a lithium secondary battery according to another embodiment of the present invention includes a lithium salt, an organic solvent, and an additive. [77] At this time, the additives are the same as those described above. Meanwhile, the additive may be included in an amount of 0.1 to 5 parts by weight, preferably 0.15 to 5 parts by weight, more preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the non-aqueous electrolyte solution for the lithium secondary battery. When the content of the additive is included within the above range, the SEI film can be stably maintained on both electrodes, the decomposition reaction of the electrolyte can be suppressed, and the solubility in the non-aqueous electrolyte for a lithium secondary battery is maintained above a certain level and does not react. It is possible to prevent the resistance from increasing by residual additives. [78] The lithium salt is used as an electrolyte salt in a lithium secondary battery, and is used as a medium for transferring ions. Typically, the lithium salt is LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiClO 4 , LiN(C 2 F 5 SO 2 ) 2 , LiN(CF 3 SO 2 ) 2 , CF 3 SO 3 Li, LiC(CF 3 SO 2 ) 3 , LiC 4 BO 8 , LiTFSI, LiFSI, and LiClO 4It may include at least one or more compounds selected from the group consisting of, preferably LiPF 6 or LiFSI, but is not limited thereto. [79] At this time, the lithium salt may be appropriately changed within a range that is usually usable, but for proper ion conductivity and viscosity, a concentration of 0.5 to 3 M, preferably a concentration of 0.8 to 2.5 M, more preferably 0.8 It may be included in a concentration of 2 M. When the lithium salt is included in the concentration range, the impregnation of the electrode may be maintained above a certain level, and charging and discharging of the battery may be performed smoothly. [80] In addition, the organic solvent may be used without particular limitation as long as it can serve as a medium through which ions involved in the electrochemical reaction of a battery can move. Specifically, as the organic solvent, for example, a linear carbonate compound, a cyclic carbonate compound, an ether compound, or an ester compound may be used alone or in combination of two or more, and among them, representatively, a cyclic carbonate compound, a linear carbonate Compounds, or mixtures thereof. [81] Specific examples of the cyclic carbonate compound include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, and It may be any one selected from the group consisting of 2,3-pentylene carbonate, or a mixture of two or more of them. In addition, specific examples of the linear carbonate compound include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, methylethylcarbonate (MEC), ethylmethyl carbonate (EMC), methyl Any one selected from the group consisting of propyl carbonate and ethylpropyl carbonate, or a mixture of two or more of them may be representatively used, but is not limited thereto. [82] In particular, ethylene carbonate and propylene carbonate, which are cyclic carbonates of the carbonate compounds, are highly viscous organic solvents and have high dielectric constants, so they can be preferably used because they dissociate lithium salts in the electrolyte well, and low points such as dimethyl carbonate and diethyl carbonate Also, if a low dielectric constant linear carbonate is mixed in an appropriate ratio, an electrolyte solution having a high electrical conductivity can be prepared, and thus it can be used more preferably. [83] As the ether compound, any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methylpropyl ether, and ethylpropyl ether, or a mixture of two or more of them may be used, but is limited thereto. It is not. [84] As the ester compound, methyl propionate, ethyl propionate (EP), propyl propionate (PP), n-propyl propionate, iso-propyl propionate, n-butyl propionate, iso-butyl Linear esters selected from the group consisting of propionate and tert-butyl propionate; And any one selected from the group consisting of cyclic esters such as γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, and ε-caprolactone, or a mixture of two or more thereof may be used. However, it is not limited thereto. [85] In the present invention, ethylene carbonate and ethylmethyl carbonate may be preferably mixed and used, and the mixing ratio may be 10:90 to 40:60, more preferably 20:80 to 40:60. When the compound is mixed and used as an organic solvent as described above, a non-aqueous electrolyte having an appropriate ionic conductivity can be provided, so that the mobility of lithium ions in the battery can be improved, and the safety of the battery can be improved. [86] [87] [88] Next, a lithium secondary battery according to the present invention will be described. A secondary battery according to another embodiment of the present invention includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte for a lithium secondary battery. Since the non-aqueous electrolyte solution for a lithium secondary battery is the same as described above, a detailed description will be omitted. [89] [90] Specifically, the lithium secondary battery according to the present invention may be manufactured by injecting the non-aqueous electrolyte solution for a lithium secondary battery into an electrode structure comprising the positive electrode, the negative electrode, and a separator interposed between the positive electrode and the negative electrode. At this time, the positive electrode, the negative electrode, and the separator constituting the electrode structure may be all those commonly used in manufacturing a lithium secondary battery. [91] [92] The positive electrode may be prepared by coating a positive electrode mixture slurry including a positive electrode active material, a binder, a conductive material, and a solvent on the positive electrode current collector. [93] The positive electrode current collector is not particularly limited as long as it has conductivity without causing chemical changes to the battery, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or carbon on the surface of aluminum or stainless steel. , Nickel, titanium, silver, or the like may be used. [94] The positive electrode active material is a compound capable of reversible intercalation and deintercalation of lithium, and specifically, may include a lithium composite metal oxide containing lithium and at least one metal such as cobalt, manganese, nickel or aluminum. have. More specifically, the lithium composite metal oxide is a lithium-manganese oxide (eg, LiMnO 2 , LiMn 2 O 4, etc.), a lithium-cobalt oxide (eg, LiCoO 2, etc.), a lithium-nickel oxide (E.g., LiNiO 2 ), lithium-nickel-manganese oxide (e.g., LiNi 1-Y1 Mn Y1 O 2 (here, 0