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. 2019-0112753 on September 11, 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] In modern society, the dependence on electric energy is increasing, and accordingly, the production of electric energy is further increasing. In order to solve the environmental problems that occurred during this process, new and renewable energy generation is in the spotlight as a next-generation power generation system. In the case of such renewable energy, since it exhibits intermittent power generation characteristics, a large-capacity power storage device is essential to stably supply power. Among these power storage devices, a lithium ion battery is in the spotlight as a device with the highest energy density that has been commercialized. [7] The lithium ion battery includes a positive electrode made of a transition metal oxide containing lithium, a negative electrode capable of storing lithium, an electrolyte containing an organic solvent containing lithium salt, and a separator. [8] In the case of a double anode, energy is stored through the redox reaction of the transition metal, which results in that the transition metal must be included in the cathode material. [9] On the other hand, during repeated charging and discharging, the specific anode structure is collapsed and the transition metal is eluted, or the transition metal is eluted by an acid formed by a side reaction of the electrolyte or hydrolysis/thermal decomposition of lithium salt under high operating potential. There is a problem with melting. [10] In the case of eluted transition metals, solid electrolyte interphase not only increases the resistance of the anode by re-deposition on the anode, but also is electrodeposited on the cathode through an electrolyte to self-discharge the cathode and impart passivation ability to the anode. (SEI) is known as a factor that increases the interfacial resistance of the anode while promoting an additional electrolyte decomposition reaction by breaking the film. [11] Since these series of reactions reduce the amount of available lithium ions in the battery, it is a major cause of deterioration of the capacity of the battery. In addition, when the metal ions electrodeposited on the negative electrode grow into a dendritic form, an internal short circuit of the battery is generated, which leads to a decrease in the safety of the battery. [12] [13] Prior art literature [14] Japanese Laid-Open Patent Publication No. 2012-248311 [15] Korean Patent Publication No. 2018-0025917 DETAILED DESCRIPTION OF THE INVENTION technical challenge [16] An object of the present invention is to provide a non-aqueous electrolyte for a lithium secondary battery that includes an additive that forms a strong film on the surface of a positive electrode and has an excellent effect of removing decomposition products generated from lithium salts. [17] In addition, an object of the present invention is to provide a lithium secondary battery having improved high-temperature storage characteristics and high-temperature cycle characteristics by including the non-aqueous electrolyte for lithium secondary batteries. means of solving the problem [18] In one embodiment of the present invention for achieving the above object, [19] Lithium salt, an organic solvent and a first additive, [20] The first additive provides a non-aqueous electrolyte for a lithium secondary battery comprising a compound represented by the following formula (1). [21] [Formula 1] [22] [23] In Formula 1, [24] R 1 , R 3 , R 4 and R 5 are each independently hydrogen or a substituted or unsubstituted C 1 to C 10 alkyl group, [25] R 2 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms. [26] [27] In another embodiment of the present invention [28] 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. Effects of the Invention [29] The compound represented by Formula 1 contained in the non-aqueous electrolyte of the present invention is a Lewis base-based compound containing a phosphite (PO 3 ) group in the structure, and forms a strong film on the positive electrode during oxidation to transition from the positive electrode It is possible to realize a lithium secondary battery with improved high-temperature storage characteristics and cycle performance by suppressing metal elution and removing decomposition products caused by anion decomposition of lithium salts inside the battery during charging and discharging. Best mode for carrying out the invention [30] Hereinafter, the present invention will be described in more detail. [31] 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. [32] [33] The passivation ability of the SEI film formed by electrolyte decomposition on the surface of the anode/cathode is a factor that greatly affects the high-temperature storage performance. Meanwhile, HF and PF 5 generated by thermal decomposition of LiPF 6 , a lithium salt widely used in lithium ion batteries, are known as one of the factors that deteriorate the film. When the surface of the anode is deteriorated by the acid attack, the transition metal elution occurs, and the surface resistance of the electrode increases due to a change in the local structure of the surface, thereby reducing the expression capacity. In addition, the transition metal constituting the anode is easily eluted into the electrolyte due to the structural change of the anode due to repeated charging and discharging, and the eluted transition metal ions are re-deposited on the anode to increase the resistance of the anode. becomes this Alternatively, the transition metal moved 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. Since these series of reactions reduce the amount of available lithium ions in the battery, not only the capacity of the battery is deteriorated, but also the resistance of the electrolyte is increased because it is accompanied by a decomposition reaction of the electrolyte. . [34] In the present invention, the eluted metal ions that cause such deterioration and poor behavior are removed from the inside of the battery to prevent electrodeposition on the negative electrode or positive electrode, and at the same time form a strong film on the surface of the positive electrode to suppress the elution of transition metals. An object of the present invention is to provide a non-aqueous electrolyte for a lithium secondary battery comprising a, and a lithium secondary battery comprising the same. [35] [36] Non-aqueous electrolyte for lithium secondary battery [37] Specifically, in one embodiment of the present invention [38] Lithium salt, an organic solvent and a first additive, [39] There is provided a non-aqueous electrolyte for a lithium secondary battery comprising a compound represented by the following formula (1) as the first additive. [40] [Formula 1] [41] [42] In Formula 1, [43] R 1 , R 3 , R 4 and R 5 are each independently hydrogen or a substituted or unsubstituted C 1 to C 10 alkyl group, [44] R 2 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms. [45] [46] lithium salt [47] First, in the non-aqueous electrolyte for a lithium secondary battery of the present invention, the lithium salt can 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. [48] 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 types In addition to these, lithium salts commonly used in electrolytes for lithium secondary batteries may be used without limitation. [49] The lithium salt can 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 1.0 M to 3.0 M, in order to obtain an optimal effect of forming a film for preventing corrosion of the electrode surface. can [50] 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 [51] [52] (2) organic solvents [53] In the nonaqueous 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 organic solvent thereof. [54] 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 [55] 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. [56] The cyclic carbonate organic solvent and the linear carbonate organic solvent may be included in a volume ratio of 10:90 to 50:50, specifically 15:85 to 30:70 in order to secure high ionic conductivity. [57] In addition, the organic solvent has a lower melting point than the cyclic carbonate-based organic solvent and/or the linear carbonate-based organic solvent, and has high stability at high temperature, in order to prepare an electrolyte solution having high ionic conductivity, a linear ester-based organic solvent and a cyclic ester At least one or more ester-based organic solvents among organic solvents may be further included. [58] 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 [59] 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 [60] Meanwhile, as the organic solvent, an organic solvent commonly used in an electrolyte 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. [61] [62] (3) additives [63] The non-aqueous electrolyte for a lithium secondary battery of the present invention may include a compound represented by the following Chemical Formula 1 as a first additive. [64] [Formula 1] [65] [66] In Formula 1, [67] R 1 , R 3 , R 4 and R 5 are each independently hydrogen or a substituted or unsubstituted C 1 to C 10 alkyl group, [68] R 2 is a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms. [69] [70] Specifically, in Formula 1, R 1 , R 3 , R 4 and R 5 are each independently hydrogen or a substituted or unsubstituted C 1 to C 8 alkyl group, R 2 is a substituted or unsubstituted C 1 to C 8 may be an alkylene group of [71] In addition, in Formula 1, R 1 , R 3 , R 4 and R 5 are each independently a substituted or unsubstituted C 1 to C 6 alkyl group, and R 2 is a substituted or unsubstituted C 1 to C 6 alkylene. it can be a gimmick [72] In addition, in Formula 1, R 1 , R 3 , R 4 and R 5 are each independently a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms, and R 2 is a substituted or unsubstituted alkylene having 1 to 4 carbon atoms. it can be a gimmick [73] In addition, in Formula 1, R 1 , R 3 , R 4 and R 5 are each independently a substituted or unsubstituted C 1 to C 3 alkyl group, and R 2 is a substituted or unsubstituted C 1 to C 3 alkylene. it can be a gimmick [74] Specifically, the compound represented by Formula 1 may be a compound represented by Formula 1a below. [75] [Formula 1a] [76] [77] [78] Since the compound represented by Formula 1 contains a phosphite (PO 3 ) group in its structure, it forms a strong film on the positive electrode while being oxidized, thereby suppressing the transition metal elution of the positive electrode and furthermore, by alleviating self-discharge of the secondary battery, high-temperature storage and Cycle performance can be improved. In addition, the compound represented by Formula 1 may act as a Lewis base to react with Lewis acids such as HF and PF 5 , which are decomposition products generated by decomposition of anions, to remove them. Therefore, it is possible to suppress the deterioration behavior due to the chemical reaction of the surface film of the anode or the anode caused by the Lewis acid, and thus it is possible to prevent further decomposition of the electrolyte solution of the battery due to the destruction of the film. [79] [80] Meanwhile, the compound of Formula 1 may be included in an amount of 0.1 wt% to 5 wt%, specifically 0.1 wt% to 3 wt%, based on the total weight of the non-aqueous electrolyte. [81] 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, if the content of the compound represented by Formula 1 is less than 0.1 wt %, HF or PF 5 may be initially removed, but as time passes, the removal effect is insignificant, and the positive electrode protection effect may be reduced. In addition, when the content of the compound represented by Formula 1 exceeds 5.0 wt %, side reactions and by-products may occur due to an excess of additives, thereby increasing the resistance of the secondary battery when stored at a high temperature. [82] Therefore, when the compound represented by Formula 1 is included in 0.1 wt% to 5 wt%, specifically 0.1 wt% to 3 wt%, while minimizing disadvantages such as side reactions, capacity reduction and resistance increase due to additives, While forming a strong film on the surface of the anode, acids such as HF and PF 5 , which are decomposition products of lithium salts, can be more effectively removed. [83] [84] (4) second additive [85] In addition, the non-aqueous electrolyte for a lithium secondary battery of the present invention prevents negative electrode collapse due to decomposition of the non-aqueous electrolyte in a high-output environment, or has low-temperature high-rate discharge characteristics, high-temperature stability, overcharge prevention, and battery expansion inhibition effect at high temperature. In order to improve it, if necessary, second additives may be further included in the non-aqueous electrolyte. [86] Representative examples of the second additive include a cyclic carbonate-based compound, a halogen-substituted carbonate-based compound, a sultone-based compound, a sulfate-based compound, a phosphate-based compound, a borate-based compound, a nitrile-based compound, a benzene-based compound, an amine-based compound, and a silane-based compound At least one second additive selected from the group consisting of a compound and a lithium salt-based compound may be included. [87] The cyclic carbonate-based compound may include vinylene carbonate (VC) or vinylethylene carbonate. [88] The halogen-substituted carbonate-based compound may include fluoroethylene carbonate (FEC)). [89] The sultone-based compound includes 1,3-propane sultone (PS), 1,4-butane sultone, ethenesultone, 1,3-propene sultone (PRS), 1,4-butene sultone, and 1-methyl-1,3 - at least one compound selected from the group consisting of propene sultone. [90] The sulfate-based compound may include ethylene sulfate (Esa), trimethylene sulfate (TMS), or methyl trimethylene sulfate (MTMS). [91] The phosphate-based compound is lithium difluoro (bisoxalato) phosphate, lithium difluoro phosphate, tetramethyl trimethyl silyl phosphate, trimethyl silyl phosphate, tris (2,2,2-trifluoroethyl) phosphate and tris ( and at least one compound selected from the group consisting of trifluoroethyl) phosphate. [92] The borate-based compound may include tetraphenylborate, lithium oxalyldifluoroborate (LiODFB), or lithium bisoxalatoborate (LiBOB, LiB(C 2 O 4 ) 2 ). [93] The nitrile-based compound is succinonitrile, adiponitrile, acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentane carbonitrile, cyclohexane carbonitrile, 2-fluorobenzo At least one selected from the group consisting of nitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile compounds can be mentioned. [94] The benzene-based compound may include fluorobenzene, the amine-based compound may include triethanolamine or ethylenediamine, and the silane-based compound may include tetravinylsilane. [95] The lithium salt-based compound is a compound different from the lithium salt included in the non-aqueous electrolyte, and may include at least one compound selected from the group consisting of LiPO 2 F 2 or LiBF 4 . [96] Among these second additives, when vinylene carbonate, vinylethylene carbonate, or succinonitrile is included, a more robust SEI film may be formed on the surface of the anode during the initial activation process of the secondary battery. In addition, when the LiBF 4 is included, generation of a gas that may be generated due to the decomposition of the electrolyte at a high temperature is suppressed, thereby improving the high temperature stability of the secondary battery. [97] [98] Meanwhile, two or more kinds of the second additives may be mixed and used, and may be included in an amount of less than 50% by weight, specifically 0.01 to 10% by weight, preferably 0.05 to 5% by weight based on the total weight of the non-aqueous electrolyte. can When the content of the second additive is less than 0.01% by weight, the effect of improving low-temperature output and high-temperature storage characteristics and high-temperature lifespan characteristics of the battery is insignificant, and when the content of the second additive is 50% by weight or more, the battery is charged and discharged when the content of the second additive is 50% by weight or more. There is a possibility that a side reaction in the electrolyte solution may occur excessively. In particular, when the additives for forming the SEI film are added in excess, they may not be sufficiently decomposed at a high temperature, and thus may remain unreacted or precipitated in the electrolyte at room temperature. Accordingly, a side reaction in which the lifespan or resistance characteristic of the secondary battery is deteriorated may occur. [99] [100] lithium secondary battery [101] In another embodiment of the present invention, there is provided a lithium secondary battery comprising the non-aqueous electrolyte for a lithium secondary battery of the present invention. [102] [103] On the other hand, the lithium secondary battery of the present invention can 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 adding the non-aqueous electrolyte of the present invention. [104] 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, and will be described in detail below. [105] (1) Anode [106] 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. [107] The positive electrode current collector is not particularly limited as long as it has conductivity without causing a chemical change in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or carbon on the surface of aluminum or stainless steel. , nickel, titanium, silver, etc. may be used. [108] 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 at least one metal selected from the group and lithium composite metal oxide including lithium and one or more metals such as cobalt, manganese, nickel, or aluminum including lithium. [109] More specifically, the lithium composite metal oxide is a lithium-manganese-based oxide (eg, LiMnO 2 , LiMn 2 O 4 , etc.), a lithium-cobalt-based oxide (eg, LiCoO 2 etc.), lithium-nickel-based oxide (eg, LiNiO 2 , etc.), lithium-nickel-manganese oxide (eg, LiNi 1-Y Mn Y O 2 (0