Title of Invention: Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same technical field [One] Cross-Citation with Related Application(s) [2] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0160560 dated December 05, 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 relates to a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising the same. background [6] As dependence on electric energy increases in modern society, renewable energy that can increase production without causing environmental problems is emerging as a next-generation power generation system. [7] Since renewable energy exhibits intermittent power generation characteristics, a large-capacity power storage device capable of stably supplying power is essential. Among these power storage devices, a lithium ion battery is in the spotlight as a device with the highest energy density currently being commercialized. [8] A lithium ion battery consists of a positive electrode including a transition metal oxide containing lithium as a positive electrode active material, a negative electrode capable of storing lithium, an electrolyte containing an organic solvent containing lithium salt, and a separator. [9] In the case of the positive electrode, energy is stored through the redox reaction of the transition metal, which results in that the transition metal must be included in the positive electrode material. [10] On the other hand, during repeated charging and discharging, the positive electrode active material structurally collapses, resulting in degradation of battery performance. That is, metal ions eluted from the surface of the anode due to structural collapse of the anode are electro-deposited on the cathode, thereby deteriorating the performance of the battery. This degradation of battery performance tends to be accelerated when the potential of the positive electrode increases or the battery is exposed to high temperatures. [11] In order to control such deterioration behavior, research has been conducted on the application of additives that form a film on the anode, and in addition, studies are being conducted to inhibit the electrodeposition of the eluted transition metal on the cathode or the occurrence of ion substitution. DETAILED DESCRIPTION OF THE INVENTION technical challenge [12] The present invention is to solve the above problems, and to provide a non-aqueous electrolyte for a lithium secondary battery comprising an additive capable of forming a complex with a transition metal ion eluted from a positive electrode. [13] In addition, the present invention is to provide a lithium secondary battery with improved high-rate charge-discharge characteristics by ensuring high-temperature performance by including the non-aqueous electrolyte for a lithium secondary battery. means of solving the problem [14] According to one embodiment, the present invention provides a non-aqueous electrolyte for a lithium secondary battery comprising a compound represented by the following Chemical Formula 1 as a lithium salt, an organic solvent, and an additive. [15] [Formula 1] [16] [17] In Formula 1, [18] R 1 to R 5 are each independently hydrogen, a substituted or unsubstituted C 1 to C 5 alkyl group, or —CN, and at least one of R 1 to R 5 is a —CN group. [19] [20] According to another embodiment, the present invention provides a lithium secondary battery comprising a negative electrode, a positive electrode, a separator interposed between the negative electrode and the positive electrode, and a non-aqueous electrolyte, wherein the non-aqueous electrolyte includes the non-aqueous electrolyte for a lithium secondary battery of the present invention do. Effects of the Invention [21] The compound represented by Chemical Formula 1 included in the non-aqueous electrolyte of the present invention is a compound of a zwitter-ion structure, which is a neutral molecule electrically positive and negative in one molecule, and ions of the non-aqueous electrolyte by zwitter ions Conductivity can be further improved. In addition, the compound represented by Formula 1 can form a stable film on the negative electrode by a double bond included in the molecular structure, and transition eluted from the positive electrode of the lithium secondary battery by at least one cyano group included in the molecular structure It can form complexes with metal ions. Accordingly, it is possible to suppress the electrodeposition or ion substitution of transition metal ions on the cathode. As such, the compound represented by Formula 1 included as an additive may be decomposed before the organic solvent to form a film on the surface of the anode, and may reduce the concentration of foreign metal in the electrolyte. Therefore, since the non-aqueous electrolyte can suppress the continuous decomposition reaction, it is possible to implement a lithium secondary battery with improved charge/discharge characteristics. Brief description of the drawing [22] The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the above-described content of the present invention, so the present invention is limited to the matters described in those drawings It should not be construed as being limited. [23] 1 is a graph showing the evaluation results of the metal (Co) ion electrodeposition of the non-aqueous electrolyte according to Experimental Example 1. [24] FIG. 2 is a graph showing the measurement result of the decomposition start voltage of the non-aqueous electrolyte of Examples and Comparative Examples according to Experimental Example 2. FIG. [25] 3 is a graph showing the results of evaluation of room temperature output characteristics of the lithium secondary batteries of Examples and Comparative Examples according to Experimental Example 5; [26] 4 is a graph showing the results of evaluation of room temperature output characteristics of the lithium secondary batteries of Examples and Comparative Examples according to Experimental Example 5; Best mode for carrying out the invention [27] Hereinafter, the present invention will be described in more detail. [28] The terms or words used in the present 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. [29] [30] Conventionally (i) by an acid (eg, hydrogen fluoride (HF)) formed by hydrolysis and thermal decomposition of lithium salt or an acid generated by a side reaction between the positive electrode and the electrolyte, or (ii) by repeated charging and discharging The transition metal is easily eluted from the anode into the electrolyte due to the structural change of the anode, and the eluted transition metal ions are re-deposited on the anode, which increases the resistance of the anode. In addition, the transition metal transferred to the negative electrode through the electrolyte is electrodeposited on the negative electrode, causing self-discharge of the negative electrode, and destroying the solid electrolyte interphase (SEI) film that gives the negative electrode passivation ability. increase the interfacial resistance of Since these series of reactions decrease the amount of available lithium ions in the secondary battery, not only the capacity of the secondary battery is deteriorated, but also the resistance of the secondary battery is increased because the decomposition reaction of the electrolyte is accompanied. [31] Moreover, when a metal foreign material is included in the electrode during the manufacture of the electrode, the metal foreign material is electrodeposited on the surface of the negative electrode during initial charging and grows into a dendritic form, thereby causing an internal short circuit of the secondary battery. This phenomenon is a major cause of low voltage failure. [32] In the present invention, it is decomposed before the organic solvent to form a strong film on the surface of the negative electrode, and forms a complex with metal ions or metal foreign substances that cause deterioration and poor behavior as described above, so that the metal ions are transferred to the negative electrode An object of the present invention is to provide a non-aqueous electrolyte for a lithium secondary battery containing an additive capable of preventing electrodeposition, and a lithium secondary battery having improved high-rate charge/discharge characteristics at a high temperature by including the same. [33] [34] Non-aqueous electrolyte for lithium secondary battery [35] According to one embodiment, the present invention [36] Provided is a non-aqueous electrolyte for a lithium secondary battery comprising a compound represented by the following formula (1) as a lithium salt, an organic solvent, and an additive. [37] [Formula 1] [38] [39] In Formula 1, [40] R 1 to R 5 are each independently hydrogen, a substituted or unsubstituted C 1 to C 5 alkyl group, or —CN, and at least one of R 1 to R 5 may be a —CN group. [41] [42] (1) lithium salt [43] First, in the non-aqueous electrolyte for a lithium secondary battery of the present invention, the lithium salt may be used without limitation, those commonly used in the electrolyte for a lithium secondary battery, for example, Li + as a cation, F - as an anion , Cl - , Br - , I - , NO 3 - , N(CN) 2 - , BF 4 - , ClO 4 - , B 10 Cl 10 - , AlCl 4 - , AlO 4 - , PF 6 - , CF 3 SO 3 - , CH 3 CO 2 - , CF 3 CO 2 - , AsF 6 - , SbF 6 - , CH 3 SO 3 - , (CF 3 CF 2 SO 2 ) 2 N - , (CF 3 SO 2 ) 2 N - , (FSO 2 ) 2 N - , BF 2 C 2 O 4 - , BC 4 O 8 - , PF 4 C 2 O 4 - , PF 2 C 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3) 6 P - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH - , CF 3 (CF 2 ) 7 SO 3 - and SCN -At least one selected from the group consisting of may be mentioned. [44] Specifically, the lithium salt is LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 4 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiCH 3 SO 3 , LiFSI (Lithium bis(fluorosulfonyl)imide, LiN(SO 2 F) 2), LiBETI (lithium bis(perfluoroethanesulfonyl)imide, LiN(SO 2 CF 2 CF 3 ) 2 and LiTFSI (lithium bis(trifluoromethanesulfonyl)imide, LiN(SO 2 CF 3 ) 2 ) A single substance or two or more kinds selected from the group consisting of In addition to these, lithium salts commonly used in electrolytes for lithium secondary batteries may be used without limitation. [45] The lithium salt may be appropriately changed within the range that can be used in general, but to be included in the electrolyte at a concentration of 0.8 M to 4.0 M, specifically, at a concentration of 1.0M to 3.0M, in order to obtain an optimal effect of forming a film for preventing corrosion of the electrode surface. can [46] If the concentration of the lithium salt is less than 0.8 M, the effect of improving the low-temperature output of the lithium secondary battery and improving the cycle characteristics during high-temperature storage is insignificant. can [47] [48] (2) organic solvents [49] In the non-aqueous electrolyte for a lithium secondary battery according to the present specification, the organic solvent may include a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, or a mixed non-aqueous organic solvent thereof. [50] The cyclic carbonate-based organic solvent is a high-viscosity organic solvent that has a high dielectric constant and can well dissociate lithium salts in the electrolyte, and specific examples thereof include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene. At least one organic solvent selected from the group consisting of carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate and vinylene carbonate, among them, ethylene carbonate may include. [51] In addition, the linear carbonate-based organic solvent is an organic solvent having a low viscosity and a low dielectric constant, and representative examples thereof include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethylmethyl carbonate ( EMC), at least one organic solvent selected from the group consisting of methyl propyl carbonate and ethyl propyl carbonate may be used, and specifically, ethyl methyl carbonate (EMC) may be included. [52] The organic solvent is preferably a mixed organic solvent of a cyclic carbonate-based organic solvent and a linear carbonate-based organic solvent in order to prepare an electrolyte solution having high ionic conductivity. [53] In addition, the organic solvent may further include a linear ester-based organic solvent and/or a cyclic ester-based organic solvent to the cyclic carbonate-based organic solvent and/or the linear carbonate-based organic solvent. [54] Specific examples of the linear ester-based organic solvent include at least one organic solvent selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate and butyl propionate. can be heard [55] In addition, the cyclic ester-based organic solvent includes at least one organic solvent selected from the group consisting of γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone and ε-caprolactone. can [56] Meanwhile, as the organic solvent, an organic solvent commonly used in an electrolyte solution for a lithium secondary battery may be added without limitation, if necessary. For example, at least one organic solvent of an ether-based organic solvent, an amide-based organic solvent, and a nitrile-based organic solvent may be further included. [57] [58] (3) additives [59] The non-aqueous electrolyte for a lithium secondary battery of the present invention may include a compound represented by the following formula (1) as an additive. [60] [Formula 1] [61] [62] In Formula 1, [63] R 1 to R 5 are each independently hydrogen, a substituted or unsubstituted C 1 to C 5 alkyl group, or —CN, and at least one of R 1 to R 5 may be a —CN group. [64] In addition, in Formula 1, R 1 to R 5 are each independently hydrogen, a substituted or unsubstituted C 1 to C 3 alkyl group, or —CN, and at least one of R 1 to R 5 may be a —CN group. [65] Specifically, in Formula 1, R 1 is -CN, R 2 to R 5 are each independently hydrogen, a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, or -CN, and at least one of R 2 to R 5 The above may be a -CN group. [66] More specifically, in Formula 1, R 1 is -CN, R 2 to R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms or -CN, and at least one or more of R 2 to R 5 may be a -CN group. [67] More specifically, in Formula 1, R 1 is -CN, R 2 and R 3 are -CN, and R 4 and R 5 may be a substituted or unsubstituted C1-C3 alkyl group. [68] Preferably, the compound represented by Formula 1 is a compound represented by Formula 1a, such as N-[3-cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-N -Ethyl-ethaniminium inner salt (N-[3-Cyano-3-[4-(dicyanomethyl)phenyl]-2-propenylidene]-N-ethyl-ethaniminium inner salt) may be. [69] [Formula 1a] [70] [71] [72] The compound represented by Formula 1 included as an electrolyte additive in the present invention is a compound having a zwitterion ion structure, which is a neutral molecule electrically positive and negative in one molecule. Therefore, in the case of a non-aqueous electrolyte including the same, ionic conductivity may be further improved by the zwitterion of the compound represented by Formula 1 . In addition, it is possible to form a stable film on the negative electrode due to the double bond contained in the molecule. [73] In particular, the compound represented by Formula 1 includes at least one cyano group together with a zwitterion in a molecule, and such a cyano group forms a complex with a transition metal ion eluted from the positive electrode of a lithium secondary battery, so that the metal ion is Electrodeposition on the cathode or ion substitution can be suppressed. Therefore, the non-aqueous electrolyte containing such a compound as an additive is decomposed before the organic solvent to form a film on the surface of the anode, and the concentration of metal foreign substances in the electrolyte is reduced, thereby suppressing the continuous decomposition reaction of the non-aqueous electrolyte. Accordingly, when the non-aqueous electrolyte including the compound represented by Formula 1 is provided, a lithium secondary battery having improved high-rate charge/discharge characteristics can be realized. [74] [75] Meanwhile, the compound of Formula 1 may be included in an amount of 0.05 wt% to 1 wt%, specifically 0.1 wt% to 1 wt%, based on the total weight of the non-aqueous electrolyte. [76] When the compound represented by Formula 1 is included in the above range, it is possible to manufacture a secondary battery with improved overall performance. For example, when the compound represented by Formula 1 is included in the range of 0.05 wt% to 1 wt%, while maximally suppressing disadvantages such as side reactions due to additives, capacity reduction, and resistance increase, the removal of forming a complex with metal ions At the same time, a strong film can be formed on the surface of the anode. If the content of the compound represented by Formula 1 exceeds 1% by weight, not only the initial capacity is lowered, but also the solubility of the additive in the non-aqueous organic solvent is lowered, so side reactions and resistance due to the additive may increase. . For example, since the compound represented by Formula 1 in the non-aqueous electrolyte has low solubility in the non-aqueous organic solvent, when it is contained in excess of 1 wt % in the non-aqueous electrolyte, it remains undissolved and causes side reactions. It is not easy to implement a secondary battery. [77] [78] lithium secondary battery [79] Further, in another embodiment of the present invention, there is provided a lithium secondary battery including the non-aqueous electrolyte for a lithium secondary battery of the present invention. [80] Specifically, the lithium secondary battery of the present invention may be manufactured by forming an electrode assembly in which a positive electrode, a negative electrode, and a separator are sequentially stacked between the positive and negative electrodes, stored in a battery case, and then by adding the non-aqueous electrolyte of the present invention. . The method for manufacturing the lithium secondary battery of the present invention may be manufactured and applied according to a conventional method known in the art. [81] On the other hand, the positive electrode, the negative electrode, and the separator constituting the lithium secondary battery of the present invention are as described later. [82] [83] (1) Anode [84] The positive electrode may be prepared by coating a positive electrode slurry including a positive electrode active material, a binder, a conductive material, and a solvent on a positive electrode current collector, followed by drying and rolling. [85] The positive electrode current collector is not particularly limited as long as it has conductivity without causing a chemical change in the secondary battery. For example, on the surface of stainless steel, aluminum, nickel, titanium, sintered carbon, or aluminum or stainless steel. Carbon, nickel, titanium, silver or the like surface-treated may be used. [86] The positive active material is a compound capable of reversible intercalation and deintercalation of lithium, and is specifically made of nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe) and aluminum (Al). It may include a lithium composite metal oxide including at least one metal selected from the group and lithium. [87] More specifically, the lithium composite metal oxide is a lithium-manganese oxide (eg, LiMnO 2 , LiMn 2 O 4 , etc.), lithium-nickel-manganese-cobalt-based oxide (eg, Li(Ni p Co q ) Mn r1 )O 2 (0