This application claims the benefit of priority based on Korean Patent Application No. 2019-0006093 dated January 17, 2019 and Korean Patent Application No. 2020-0005266 dated January 15, 2020, The content is incorporated as part of this specification. [3] [4] technical field [5] The present invention relates to a non-aqueous electrolyte additive, a non-aqueous electrolyte for a lithium secondary battery comprising the same, and a lithium secondary battery. background [6] As personal IT devices and computer networks are developed due to the development of the information society, and the overall society's dependence on electric energy increases accordingly, technology development for efficiently storing and utilizing electric energy is required. [7] Among the technologies developed for this purpose, the most suitable technology for various uses is a secondary battery-based technology. In the case of secondary batteries, interest in this is emerging because they can be miniaturized enough to be applied to personal IT devices, and can also be applied to electric vehicles and power storage devices. Among these secondary battery technologies, a lithium ion battery, which is a battery system with the highest theoretical energy density, is in the spotlight and is currently being applied to various devices. [8] In the case of lithium ion battery systems, unlike the early days when lithium metal was directly applied to the system, a transition metal oxide material containing lithium was used as a cathode material, and a carbon-based material such as graphite and an alloy-based material such as silicon were used as an anode material. It is implemented as a system in which lithium metal is not directly used inside the battery, such as applying a material as an anode. [9] In the case of such a lithium ion battery, it is largely composed of a positive electrode composed of a transition metal oxide containing lithium, a negative electrode capable of storing lithium, an electrolyte as a medium for transferring lithium ions, and a separator. As it is known as a component that has a great influence on stability and safety, many studies are being conducted on it. [10] In this case, the electrolyte solution for a lithium ion battery is composed of a lithium salt, an organic solvent dissolving the same, and a functional additive, and proper selection of these components is important in order to improve the electrochemical properties of the battery. [11] Representative lithium salts currently used include LiPF 6 , LiBF 4 , LiFSI (lithium fluorosulfonyl imide, LiN(SO 2 F) 2 ), LiTFSI (lithium (bis)trifluoromethanesulfonyl imide, LiN(SO 2 CF 3 ) 2 ) or LiBOB ( lithium bis(oxalate) borate, LiB(C 2 O 4 ) 2 ), etc. are used, and in the case of an organic solvent, an ester-based organic solvent or an ether-based organic solvent is used. [12] In the case of such a lithium ion battery, an increase in resistance and a decrease in capacity during charging/discharging or storage at a high temperature are suggested as problems causing performance degradation. In addition, when the side reactions caused by the deterioration of the electrolyte at high temperatures, especially the by-products generated by the decomposition of salts at high temperatures, decompose the coatings formed on the surfaces of the positive and negative electrodes after activation, the passivation ability of the coating is lowered. There is a problem of causing further decomposition of the electrolyte and self-discharge accompanying it. [13] In particular, in the case of a graphite-based negative electrode mainly used as a negative electrode for a lithium ion battery, its operating potential is 0.3 V (vs. Li/Li+) or less, which is lower than the electrochemical stability window of an electrolyte used in a lithium ion battery, so that the electrolyte is reduced first become decomposed This reduction-decomposed electrolyte product forms a solid electrolyte interphase (SEI) film that transmits lithium ions but inhibits further decomposition of the electrolyte. [14] However, as described above, as the coating is decomposed by the salt decomposition products at high temperature, a lithium ion battery is widely used lithium salt of LiPF that the 6 HF with PF is generated by thermal decomposition of 5 the passivation ability of the coating due to deterioration or, or electrodes The surface is deteriorated and the transition metal is eluted from the anode to increase the resistance, and the capacity may decrease due to the loss of the redox center. Moreover, in the case of eluted transition metal ions, they are electrodeposited on the negative electrode, and irreversible capacity increases due to the consumption of electrons due to metal electrodeposition and further electrolyte decomposition, which causes cell capacity decline as well as increased resistance and self-discharge of the graphite negative electrode. can [15] Therefore, in order to secure and maintain the passivation ability of the SEI film even during high-temperature storage, an electrolyte additive that can easily undergo reductive decomposition is introduced, or HF, which is a decomposition product such as LiPF 6 , which is a representative lithium salt generated due to heat/moisture, etc. It is urgent to introduce an additive that can eliminate the cause of battery deterioration at high temperatures by removing PF 5 and the like. [16] Prior art literature [17] Korean Patent Publication No. 2014-050058 DETAILED DESCRIPTION OF THE INVENTION technical challenge [18] An object of the present invention is to provide a non-aqueous electrolyte additive using a Lewis basic compound capable of reacting quickly with an acid. [19] In addition, in the present invention, it is an object of the present invention to provide a non-aqueous electrolyte for a lithium secondary battery including the non-aqueous electrolyte additive. [20] In addition, the present invention is to provide a lithium secondary battery comprising the non-aqueous electrolyte for a lithium secondary battery. means of solving the problem [21] According to one embodiment, the present invention provides a non-aqueous electrolyte additive, which is a compound represented by the following formula (1). [22] [Formula 1] [23] [24] In Formula 1, [25] R 1 to R 4 are each independently hydrogen or a substituted or unsubstituted C 1 to C 5 alkyl group. [26] According to another embodiment, the present invention provides a non-aqueous electrolyte for a lithium secondary battery comprising the non-aqueous electrolyte additive of the present invention as a lithium salt, an organic solvent, and a first additive. [27] The non-aqueous electrolyte for a lithium secondary battery may further include at least one second additive selected from among vinylene carbonate (VC), 1,3-propanesultone (PS), and ethylene sulfate (Esa). [28] According to another embodiment, the present invention provides a lithium secondary battery comprising the non-aqueous electrolyte for a lithium secondary battery. Effects of the Invention [29] According to the present invention, by including a Lewis base-based compound as a non-aqueous electrolyte additive, not only a stable SEI film is formed on the surface of the anode, but also an acid such as HF/PF 5 formed as a decomposition product of a lithium salt It is possible to provide a non-aqueous electrolyte having a characteristic capable of suppressing the dissolution of the positive electrode by the present invention, and furthermore, by including the same, it is possible to manufacture a lithium secondary battery having improved resistance increase during high-temperature storage. Brief description of the drawing [30] 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. [31] 1 is a graph showing an initial discharge capacity evaluation result of a lithium secondary battery according to Experimental Example 1 of the present invention. [32] 2 is a graph showing the evaluation results of high-temperature storage characteristics of the lithium secondary battery according to Experimental Example 2 of the present invention. [33] 3 is a graph showing the evaluation result of the resistance increase rate of the lithium secondary battery according to Experimental Example 3 of the present invention. [34] 4 is a graph showing the evaluation result of the SEI film formation of the lithium secondary battery according to Experimental Example 4 of the present invention. [35] 5 is a graph showing the metal ion elution evaluation results according to Experimental Example 5 of the present invention. Best mode for carrying out the invention [36] Hereinafter, the present invention will be described in more detail. [37] 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. [38] [39] The passivation ability of the SEI film formed by electrolyte decomposition on the positive/negative surface is a factor that greatly affects the high-temperature storage performance. Meanwhile, acids such as 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 anode surface is degraded by the acid attack, transition metal elution occurs and the surface resistance of the electrode increases due to a change in the local structure of the surface, and the theoretical capacity decreases due to the loss of the redox center, and thus the expression capacity may decrease. In addition, in the case of eluted metal ions, they are electrodeposited on the cathode reacting in a strong reduction potential band, consuming electrons, destroying the film, and revealing a new surface. Rather, there is a problem of continuously decreasing the capacity of the cell by increasing the irreversible capacity. [40] Accordingly, in order to suppress the deterioration of the battery, in the present invention, the deterioration of the SEI film due to PF 5 or HF can be prevented by introducing a Lewis base-based additive during the preparation of the non-aqueous electrolyte, and by removing this acid from the inside of the electrolyte, the positive electrode Elution of transition metals from In addition, in the present invention, by introducing a Lewis base-based additive during the preparation of the non-aqueous electrolyte, it is possible to form a different SEI from the existing additive on the surface of the anode while reducing decomposition, and through the modification of the SEI, the high-temperature storage performance of the secondary battery is further improved characteristics can be obtained. [41] [42] Non-aqueous electrolyte additive [43] First, an embodiment of the present invention provides a non-aqueous electrolyte additive, which is a compound represented by the following formula (1). [44] [Formula 1] [45] [46] In Formula 1, [47] R 1 to R 4 are each independently hydrogen or a substituted or unsubstituted C 1 to C 5 alkyl group. [48] Specifically, in Formula 1, R 1 and R 4 are each independently a substituted or unsubstituted C 1 to C 5 alkyl group, R 2 and R 3 are each independently hydrogen or a substituted or unsubstituted C 1 to C 5 may be an alkyl group of [49] More specifically, in Formula 1, R 1 and R 4 are each independently a substituted or unsubstituted C 1 to C 4 alkyl group, R 2 and R 3 are each independently hydrogen or a substituted or unsubstituted C 1 to C 1 3 may be an alkyl group. [50] More specifically, in Formula 1, R 1 and R 4 may be a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms, and R 2 and R 3 may be hydrogen. [51] [52] Since the compound represented by Formula 1 includes a -N-(C=S)-N- functional group functioning as a Lewis base in its structure, such as HF and PF 5 , which are decomposition products generated by anionic decomposition of lithium salts, The Lewis acid can be removed from the inside of the electrolyte. Therefore, it is possible to suppress the deterioration behavior due to the chemical reaction of the surface film of the anode or the cathode resulting from the Lewis acid, thereby preventing further decomposition of the electrolyte in the battery due to the destruction of the film. Therefore, it is possible to finally prevent the battery from self-discharge and deterioration behavior of the battery during high-temperature storage. [53] In addition, since the C = S functional group and -N-CO-O- functional group included in the structure of the compound represented by Formula 1 are easily reduced on the surface of the negative electrode, a stable SEI film with high passivation ability is formed on the surface of the negative electrode. can do. Therefore, it is possible not only to improve the high temperature durability of the anode itself, but also to reduce the amount of transition metals electrodeposited on the anode itself, and furthermore, it is possible to reduce the amount of transition metal electrodeposited on the anode itself. Self-discharge reaction of the coupled or silicon-based negative electrode can be prevented. [54] Through this comprehensive effect, the non-aqueous electrolyte additive, which is a compound represented by Formula 1 of the present invention, can stably form an SEI film and prevent the destruction of the anode/cathode film due to the decomposition of lithium salts, resulting in a self-discharge reaction of the battery. can be suppressed, and through this, characteristics such as initial discharge capacity characteristics of a lithium ion battery and resistance suppression during high temperature storage can be improved. [55] [56] Meanwhile, the compound represented by Formula 1 may be a compound represented by Formula 1a below. [57] [Formula 1a] [58] [59] [60] Non-aqueous electrolyte for lithium secondary battery [61] According to another embodiment, the present invention provides a non-aqueous electrolyte for a lithium secondary battery comprising the non-aqueous electrolyte additive of the present invention as a lithium salt, an organic solvent, and a first additive. [62] [63] Hereinafter, each component of the non-aqueous electrolyte of the present invention will be described in more detail. [64] (1) lithium salt [65] As the lithium salt, those commonly used in electrolytes for lithium secondary batteries may be used without limitation, for example, Li + as a cation of the lithium salt , and F - , Cl - , Br - , I - , NO as an anion. 3 - , N(CN) 2 - , ClO 4 - , BF 4 - , B 10 Cl 10 - , PF 6 - , CF 3 SO 3 - , CH 3 CO 2 - , CF 3 CO 2 - , AsF 6 - , SbF 6 - , AlCl 4 - , AlO 4 - , CH 3 SO 3 - , 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 - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , (CF 3 SO 2 ) 2 N - , (FSO 2 ) 2 N - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH - , (SF 5 ) 3 C - , (CF 3 SO 2 ) 3 C - , CF 3 (CF 2 ) 7 SO 3 - , SCN - and (CF 3 CF 2SO 2 ) 2 N − and at least one selected from the group consisting of. [66] Specifically, the lithium salt is LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , LiAlO 4 , LiCH 3 SO 3 , LiFSI (lithium fluorosulfonyl imide, LiN(SO 2 F) 2 ) ), LiTFSI (lithium (bis)trifluoromethanesulfonimide, LiN(SO 2 CF 3 ) 2 ), and LiBETI (lithium bisperfluoroethanesulfonimide, LiN(SO 2 C 2 F 5 ) 2 ) It may include at least one selected from the group consisting of 2 ). More specifically, lithium salts are LiPF 6 , LiBF 4 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiCH 3 SO 3 , LiFSI, LiTFSI and LiN(C 2 F 5 SO 2 ) 2 may include a danilmul or as mixtures of two or more thereof selected from the group consisting of. [67] The lithium salt may be appropriately changed within the range that can be used in general, and may specifically be included in an amount of 0.1M to 3M, specifically 0.8M to 2.5M in the electrolyte. If the concentration of the lithium salt exceeds 3M, the viscosity of the non-aqueous electrolyte is increased, so that the lithium ion migration effect is reduced, and wettability of the non-aqueous electrolyte is reduced, making it difficult to form a uniform SEI film. [68] [69] (2) organic solvents [70] The organic solvent can be minimized decomposition due to oxidation reaction during the charging and discharging process of the secondary battery, and there is no limitation on the type of the organic solvent as long as it can exhibit desired properties together with the additive. For example, a carbonate-based organic solvent, an ether-based organic solvent, or an ester-based organic solvent may be used alone or in combination of two or more. [71] Among the organic solvents, the carbonate-based organic solvent may include at least one of a cyclic carbonate-based organic solvent and a linear carbonate-based organic solvent. Specifically, the cyclic carbonate-based organic solvent is ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene It may include at least one selected from the group consisting of carbonate, 2,3-pentylene carbonate, vinylene carbonate, and fluoroethylene carbonate (FEC), and specifically ethylene carbonate and ethylene carbonate having a high dielectric constant relative to that of ethylene carbonate. as a mixed solvent of propylene carbonate having a low melting point. [72] In addition, the linear carbonate-based organic solvent is a solvent having a low viscosity and low dielectric constant, dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethylmethyl carbonate (EMC), methyl It may include at least one selected from the group consisting of propyl carbonate and ethylpropyl carbonate, and more specifically, dimethyl carbonate. [73] The ether-based organic solvent may be any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether and ethyl propyl ether, or a mixture of two or more thereof, but limited thereto it's not going to be [74] The ester-based organic solvent may include at least one selected from the group consisting of a linear ester-based organic solvent and a cyclic ester-based organic solvent. [75] In this case, the linear ester-based organic solvent is a specific example of any one selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate or A mixture of two or more of them may be typically used, but is not limited thereto. [76] Specific examples of the cyclic ester-based organic solvent include any one or two selected from the group consisting of γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone and ε-caprolactone. The above mixture may be used, but is not limited thereto. [77] As the organic solvent, a high-viscosity cyclic carbonate-based organic solvent capable of dissociating lithium salts in a non-aqueous electrolyte with high dielectric constant may be used. In addition, in order to prepare a non-aqueous electrolyte having a higher electrical conductivity, the organic solvent is combined with the environmental carbonate-based organic solvent, and a low-viscosity, low-dielectric constant linear carbonate-based compound such as dimethyl carbonate and diethyl carbonate, and a linear ester-based compound can be used by mixing in an appropriate ratio. [78] More specifically, the organic solvent may be used by mixing a cyclic carbonate-based compound and a linear carbonate-based compound, and the weight ratio of the cyclic carbonate-based compound to the linear carbonate-based compound in the organic solvent may be 10:90 to 70:30. [79] [80] (3) first additive [81] The non-aqueous electrolyte of the present invention includes the compound represented by Formula 1 as the first additive for the non-aqueous electrolyte. [82] In this case, since the description of the non-aqueous electrolyte additive overlaps with the above description, the description thereof will be omitted. [83] However, with respect to the content of the non-aqueous electrolyte additive, the non-aqueous electrolyte additive may be included in an amount of 0.01 wt % to 5 wt %, specifically 0.1 wt % to 3 wt %, based on the total weight of the non-aqueous electrolyte solution. [84] When the additive is included in the above range, it is possible to manufacture a secondary battery with improved overall performance. If the content of the additive is less than 0.01 wt% , a small amount of HF or PF 5 may be removed, but the effect of continuously removing it may be insignificant. Resistance may increase or the initial capacity may decrease due to side reactions. [85] Accordingly, when the additive is in the range of 0.01 wt% to 5 wt%, specifically 0.1 wt% to 3 wt%, it is possible to more effectively remove HF and PF 5 while maximally suppressing capacity reduction and resistance increase due to side reactions, etc. have. [86] As described above, in the present invention, by including the compound represented by Formula 1, which is the Lewis salt-based compound, as an electrolyte additive, not only a strong SEI film can be formed on the surface of the anode, but also -N- (Lewis base) functional group -N-( By the functional group containing C=S)-N-, by-products that cause battery deterioration during high-temperature storage, for example , Lewis acids such as HF and PF 5 formed due to the decomposition of lithium salts are easily removed ( scavenging), it is possible to improve disadvantages such as deterioration of the SEI film and the elution of transition metals from the anode. [87] That is, in the case of the non-aqueous electrolyte of the present invention containing the compound represented by Formula 1 as an additive, it is possible to remove Lewis acids that can cause self-discharge of the battery by attacking the surface of the positive electrode and the surface of the negative electrode in the electrolyte. By alleviating self-discharge of the battery, high-temperature storage performance can be improved. [88] [89] (4) second additive [90] In addition, the non-aqueous electrolyte for a lithium secondary battery of the present invention forms a stable film on the surface of the negative electrode and the positive electrode in addition to the effect expressed by the electrolyte additive, thereby improving the capacity characteristics and cycle characteristics during high temperature storage, and implementing the effect of reducing resistance. To this end, in addition to the compound represented by Formula 1 as the first additive, another second additive may be further included. [91] Second additives that may be additionally included include vinylene carbonate (VC), 1,3-propane sultone (PS), and ethylene, which are known to form a more stable SEI film on the surface of the anode during the initial activation process of the secondary battery. At least one additive of Ethylene Sulfate (Esa) may be applied. [92] On the other hand, the vinylene carbonate (VC), 1,3-propane sultone (PS) and ethylene sulfate (Ethylene Sulfate; Esa) are each 10 wt% or less based on the total weight of the non-aqueous electrolyte, specifically 0.1 wt% to 7 wt% % may be included. [93] When the content of each of the compounds exceeds 10% by weight, there is a possibility that side reactions in the electrolyte solution may be excessively generated during charging and discharging of the battery, and are not sufficiently decomposed at high temperature, so that unreacted substances or precipitates are present in the electrolyte solution at room temperature , and thus the lifespan or resistance characteristics of the secondary battery may be reduced. [94] In particular, the total content of the second additive may be 15 wt% or less, specifically 0.1 wt% to 15 wt%, specifically 0.1 to 10 wt%, based on the total weight of the non-aqueous electrolyte, and preferably 0.5 to 10 wt% It may be included in weight %, and more preferably, may be included in 1.0 to 7.0 weight %. [95] That is, in order to secure the high temperature durability of the non-aqueous electrolyte, the second additive must be included in at least 0.1 wt%, and the content of each compound exceeds 10 wt%, or the total content of the second additive exceeds 15 wt% When this is done, since the content of the organic solvent and lithium salt may be relatively reduced, beyond the role of the additive, there is a risk of deteriorating the basic performance of the battery, so it is necessary to appropriately adjust the content range within the above range . [96] [97] (5) SEI-forming additives [98] In addition, the non-aqueous electrolyte of the present invention forms a stable film on the surface of the negative electrode and the positive electrode, suppresses the decomposition of the solvent in the non-aqueous electrolyte, and further contains an additional additive that can serve as a complement to improve the mobility of lithium ions can do. [99] The additive is not particularly limited as long as it is an additive for forming SEI capable of forming a stable film on the surfaces of the anode and the anode. [100] Specifically, the SEI-forming additive is, for example, a halogen-substituted or unsubstituted cyclic carbonate-based compound, a nitrile-based compound, a phosphate-based compound, a borate-based compound, a lithium salt-based compound, a sulfate-based compound, a sultone-based compound, a fluorinated benzene-based compound At least one SEI-forming additive selected from the group consisting of compounds and silane-based compounds may be included. [101] Specifically, the halogen-substituted cyclic carbonate-based compound may include fluoroethylene carbonate (FEC)), and the halogen-unsubstituted cyclic carbonate-based compound forms a stable SEI film mainly on the surface of the negative electrode when the battery is activated. durability can be improved. Examples of the cyclic carbonate-based compound include vinylethylene carbonate. [102] The halogen-substituted or unsubstituted cyclic carbonate-based compound may be included in an amount of 5 wt% or less based on the total weight of the non-aqueous electrolyte. When the content of the halogen-substituted carbonate-based compound exceeds 5% by weight, cell swelling inhibition performance and initial resistance may be deteriorated. [103] In addition, the nitrile-based compound is succinonitrile, adiponitrile, acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentane carbonitrile, cyclohexane carbonitrile, 2-fluoro At least selected from the group consisting of robenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile one or more compounds. [104] When the nitrile-based compound is used together with the above-described electrolyte additive, an effect of improving high-temperature characteristics can be expected by stabilizing the anode/cathode film. That is, it can serve as a complement in forming the anode SEI film, inhibit the decomposition of the solvent in the non-aqueous electrolyte, and improve the mobility of lithium ions. The nitrile-based compound may be included in an amount of 8 wt% or less based on the total weight of the non-aqueous electrolyte. When the total weight of the nitrile-based compound in the non-aqueous electrolyte exceeds 8 wt %, resistance increases due to an increase in a film formed on the surface of the electrode, and battery performance may deteriorate. [105] In addition, since the phosphate-based compound stabilizes PF 6 anions in the electrolyte and helps to form anode and cathode films, durability of the battery can be improved. Such phosphate-based compounds include lithium difluoro(bisoxalato)phosphate (LiDFOP), lithium difluorophosphate (LiDFP, LiPO 2 F 2 ), tetramethyl trimethyl silyl phosphate (LiTFOP), and tris(2,2, and at least one compound selected from the group consisting of 2-trifluoroethyl)phosphate (TFEPa), and may be included in an amount of 3 wt% or less based on the total weight of the non-aqueous electrolyte. [106] The borate compound promotes ion pair separation of lithium salts, can improve lithium ion mobility, reduce the interfacial resistance of the SEI film, and materials such as LiF that are generated during battery reaction and are not easily separated By dissociating, problems such as generation of hydrofluoric acid gas can be solved. Such borate-based compounds may include lithium bioxalyl borate (LiBOB, LiB(C 2 O 4 ) 2 ), lithium oxalyldifluoroborate, or tetramethyl trimethylsilyl borate (TMSB), based on the total weight of the non-aqueous electrolyte. It may be included in an amount of 3% by weight or less. [107] In addition, the lithium salt-based compound is a compound different from the lithium salt contained in the non-aqueous electrolyte, and may include at least one compound selected from the group consisting of LiODFB and LiBF 4 , and 3% by weight or less based on the total weight of the non-aqueous electrolyte. may include [108] The sulfate-based compound may include trimethylene sulfate (TMS) or methyl trimethylene sulfate (MTMS), and may be included in an amount of 3 wt% or less based on the total weight of the non-aqueous electrolyte. [109] The sultone-based compound is selected from the group consisting of 1,4-butane sultone, ethensultone, 1,3-propene sultone (PRS), 1,4-butene sultone, and 1-methyl-1,3-propene sultone. and at least one compound, which may be included in an amount of 0.3 wt% to 5 wt%, specifically 1 wt% to 5 wt%, based on the total weight of the non-aqueous electrolyte. When the content of the sultone-based compound in the non-aqueous electrolyte exceeds 5 wt %, an excessively thick film is formed on the electrode surface, which may cause an increase in resistance and deterioration of output. may deteriorate. [110] The fluorinated benzene-based compound may include fluorobenzene. [111] In addition, the silane-based compound may include a compound containing silicon such as tetravinylsilane, and in the case of such a compound, it may be included in an amount of 2 wt% or less based on the total weight of the non-aqueous electrolyte. [112] The SEI-forming additive may be used in a mixture of two or more, and may be included in an amount of 10 wt% or less, specifically 0.01 wt% to 10 wt%, preferably 0.1 to 5.0 wt%, based on the total weight of the non-aqueous electrolyte. . [113] When the content of the additive for forming SEI is less than 0.01 wt %, the high temperature storage characteristics and gas reduction effect to be realized from the additive are insignificant, and when the content of the additive for forming SEI exceeds 10 wt %, the electrolyte solution during charging and discharging of the battery There is a possibility that side reactions within the body may occur excessively. In particular, when the additive for forming SEI is added in excess, it may not be sufficiently decomposed and may exist as unreacted or precipitated in the electrolyte at room temperature. Accordingly, the resistance may increase and the lifespan characteristics of the secondary battery may be deteriorated. [114] [115] lithium secondary battery [116] Further, in one 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. [117] [118] Specifically, the lithium secondary battery of the present invention can be manufactured by injecting the non-aqueous electrolyte of the present invention into an electrode assembly in which a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes are sequentially stacked. In this case, as the positive electrode, the negative electrode, and the separator constituting the electrode assembly, all of those conventionally used for manufacturing a lithium secondary battery may be used. [119] [120] On the other hand, the positive electrode and the negative electrode constituting the lithium secondary battery of the present invention may be manufactured and used in a conventional manner. [121] (1) Anode [122] First, the positive electrode may be manufactured by forming a positive electrode mixture layer on a positive electrode current collector. The positive electrode mixture layer may be formed 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. [123] 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. [124] The positive active material is a compound capable of reversible intercalation and deintercalation of lithium, and may include a lithium transition metal oxide including lithium and one or more metals selected from cobalt, manganese, nickel, or aluminum, Specifically, a lithium-nickel-manganese-cobalt-based oxide having high battery capacity characteristics and safety (for example, Li(Ni p Co q Mn r1 )O 2 (here, 0 < p < 1, 0 < q < 1, 0