Non-aqueous electrolyte and lithium secondary battery comprising same

Abstract

The present invention provides a non-aqueous electrolyte comprising: a lithium salt; an organic solvent; and an additive, wherein the additive comprises a compound represented by a specific chemical formula. The non-aqueous electrolyte forms a stable film on a positive electrode and a negative electrode, thereby improving long-term durability and lifespan performance of a lithium secondary battery.

Description

Non-aqueous electrolyte and lithium secondary battery containing the same The present invention relates to a non-aqueous electrolyte and a lithium secondary battery including the same. Recently, as the application areas of lithium secondary batteries have rapidly expanded to include not only power supply for electronic devices such as electric, electronic, communication, and computers, but also power storage for large-area devices such as automobiles and power storage devices, the demand for high-capacity, high-output, and high-stability secondary batteries is increasing. The above lithium secondary battery is generally composed of a cathode including a cathode active material, an anode including a cathode active material, an electrolyte that serves as a medium for transferring lithium ions, and a separator. At this time, carbon-based active materials, silicon-based active materials, etc. can be used as the cathode active material. In addition, lithium transition metal oxides such as lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), and lithium nickel-cobalt-manganese composite oxide can be used as the cathode active material. Meanwhile, recently, lithium-transition metal composite oxides having a nickel content of 80 mol% or more relative to the transition metal have been studied in order to increase the energy density of the anode. However, in the case of these high-nickel lithium-transition metal composite oxides, the thermal stability of the anode is deteriorated due to the high nickel content. Or, considering the problem of decreased thermal stability of the anode when increasing the nickel content, the use of lithium transition metal composite oxides with an appropriately low nickel content is also being considered. However, when the nickel content is lowered, the operating voltage for the required energy density must be increased, and when operating at high voltage, problems such as electrolyte side reactions at the anode, decreased high-temperature durability, and increased resistance may occur. In order to achieve high energy density of these anodes and lithium secondary batteries containing them, problems such as thermal stability, high-temperature durability, and electrolyte side reactions need to be solved. One object of the present invention is to solve the above-described problems, and to provide a non-aqueous electrolyte capable of improving the high-temperature durability of the positive and negative electrodes, prevention of electrolyte side reactions, and particularly long-term durability, high life performance, and storage performance. In addition, another object of the present invention is to provide a lithium secondary battery including the non-aqueous electrolyte. [1] The present invention provides a non-aqueous electrolyte comprising a lithium salt; an organic solvent; and an additive; wherein the additive comprises a compound represented by the following chemical formula 1. [Chemical Formula 1] In the above chemical formula 1, R1 is a substituent represented by the following chemical formula 2, L1 is a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, R2 is hydrogen or a substituent represented by the following chemical formula 3, and R a , R b and R c are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN. [Chemical formula 2] In the above chemical formula 2, m is 1 or 2, X1 and X2 are each independently -O- or -C(R 31 )(R 32 )-, but at least one of the above X1 and X2 is -O-, and R 31 Inland R 36are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R4 or -R5-OC(=O)-R6, wherein R4 and R6 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, wherein R5 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, and the substituents of L1, R4, R5 and R6 are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, and * represents a bonding site, R 31 , R 32 , R 33 , R 34 , R 35 , and R 36 Located in one of them. [Chemical Formula 3] In the above chemical formula 3, * is a bonding site and L2 is an alkylene group having 1 to 3 carbon atoms. [2] The present invention provides a non-aqueous electrolyte comprising at least one of the compounds represented by the following chemical formula 1-1 and the following chemical formula 1-2, wherein the compound represented by the above chemical formula 1 in the above [1]. [Chemical Formula 1-1] [Chemical Formula 1-2] In the above chemical formulas 1-1 and 1-2, R a , R b , R c , R1, L1 and L2 are as defined in the chemical formula 1. [3] The present invention provides a non-aqueous electrolyte in at least one of the above [1] and [2], wherein L1 is a methylene group. [4] The present invention provides a non-aqueous electrolyte in which at least one of the above [1] to [3], wherein the substituent represented by the chemical formula 2 is any one of the substituents selected from the following CS-1 to CS-15. [5] The present invention provides a non-aqueous electrolyte wherein in at least one of the above [1] to [4], the substituent represented by the chemical formula 2 is any one selected from the group consisting of CS-1, CS-2, CS-5, CS-8, CS-10 and CS-11. [6] The present invention provides a non-aqueous electrolyte in one or more of the above [1] to [5], wherein L2 is a methylene group. [7] The present invention provides a non-aqueous electrolyte comprising at least one of the compounds represented by the chemical formula 1 in at least one of the above [1] to [6], and represented by the chemical formula 1-A and the chemical formula 1-B. [Chemical Formula 1-A] [Chemical Formula 1-B] In the above chemical formula 1-A and chemical formula 1-B, R a , R band R c is as defined in the chemical formula 1 above. [8] The present invention provides a non-aqueous electrolyte comprising at least one of the compounds represented by the chemical formula 1 in at least one of the above [1] to [7], and represented by the chemical formula 1-a and the chemical formula 1-b. [Chemical formula 1-a] [Chemical Formula 1-b] [9] The present invention provides a non-aqueous electrolyte according to at least one of the above [1] to [8], wherein the additive further comprises a compound represented by the following chemical formula 4. [Chemical Formula 4] In the above chemical formula 4, R a1 , R b1 and R c1 are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN, and L 21 is an alkylene group having 1 to 3 carbon atoms.

[0010] The present invention provides a non-aqueous electrolyte, wherein in at least one of the above [1] to [9], the additive further comprises a compound represented by the following chemical formula 5. In the above chemical formula 5, n is 1 or 2, L 11 and L 12 are each independently a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, R 11 and R 12 are each independently a substituent represented by the following chemical formula 6, [Chemical formula 6] In the above chemical formula 6, m1 is 1 or 2, X 11 is and X 21 are each independently -O- or -C(R 311 )(R 321 ) - but, the above X 11 and X 21 At least one of them is -O-, R 311 , R 321 , R 331 , R 341 , R 351 and R 361 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R 41 or -R 51 -OC(=O)-R 61 And, Above R 41 and R 61 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, Above R 51 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, Above L 11 , L 21 , R 41 , R 51 and R 61 The substituents of are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, * is R as a binding site 311 , R 321 , R 331 , R 341 , R 351 , and R 361 Located in one of the L 11 and L 21 If all are direct bonds, R 11 and R 21 is not CS1-7 at the same time, L 11 and L 21 When all are methylene groups and n is 2, R 11 and R 21 is not CS1-2 at the same time.

[0011] The present invention provides a non-aqueous electrolyte, wherein in at least one of the above [1] to

[0010] , the substituent represented by the chemical formula 6 is selected from the group consisting of CS1-1 to CS1-15 below.

[0012] The present invention provides a non-aqueous electrolyte comprising at least one compound selected from the group consisting of compounds A to Q below, wherein the compound represented by the chemical formula 5 in one or more of the above [1] to

[0011] is: .

[0013] The present invention provides a non-aqueous electrolyte, wherein the compound represented by the chemical formula 1 in at least one of the above [1] to

[0012] is contained in an amount of 0.01 wt% to 10 wt% based on the total weight of the non-aqueous electrolyte.

[0014] The present invention relates to a lithium salt comprising at least one of the above [1] to

[0013] , wherein the lithium salt is LiCl, LiBr, LiI, LiBF4, LiClO4, LiAlO4, LiAlCl4, LiPF6, LiSbF6, LiAsF6, LiB 10 Cl 10 , LiBOB (LiB(C2O4)2), LiCF3SO3, LiFSI (LiN(SO2F)2), LiCH3SO3, LiCF3CO2, LiCH3CO2, and LiBETI (LiN(SO2CF2CF3)2).

[0015] The present invention provides a lithium secondary battery comprising: a cathode; a negative electrode opposing the cathode; a separator interposed between the cathode and the negative electrode; and the non-aqueous electrolyte described above; in at least one of the above [1] to

[0014] .

[0016] The present invention provides a lithium secondary battery according to the above

[0015] , wherein the positive electrode includes a positive electrode active material, and the positive electrode active material includes a lithium transition metal oxide represented by the following chemical formula P-1. [Chemical formula P-1] Li 1+x [Ni a Co b Mn c M 1 d ]O 2+w In the above chemical formula P-1, 0≤x≤0.5, a+b+c+d = 1, 0.5≤a≤0.7, 0≤b≤0.15, c=1-abd, 0≤d≤0.1, 0≤b / a≤0.2, 1≤a / c≤3, 0≤w≤1, M 1is at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo. The non-aqueous electrolyte of the present invention is characterized by containing as an additive a compound of a specific chemical formula having an imidazolium cation structure substituted with a cyclic sulfur oxide. When the compound is used as an additive, it can continuously contribute to the formation of a film on the positive and negative electrodes even during long-term charge and discharge, so that the effects of improving long-term life performance, high-temperature durability, and thermal stability are excellent. Therefore, a lithium secondary battery including the aforementioned non-aqueous electrolyte can have excellent life performance and high-temperature storage characteristics. In particular, when applied to a lithium secondary battery requiring high energy density and high-voltage operation, significantly excellent life performance and high-temperature storage performance can be achieved. First, before describing the present invention, it should be noted that the terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain his or her own invention in the best way. Meanwhile, the terms used in this specification are only used to describe exemplary embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, it should be understood that the terms “comprise,” “include,” or “have,” etc., are intended to specify the presence of a feature, number, step, component, or combination thereof, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, components, or combinations thereof. In this specification, “%” means weight percent unless otherwise explicitly indicated. Before explaining the present invention, in the description of "carbon number a to b" in the specification, "a" and "b" mean the number of carbon atoms included in a specific functional group. That is, the functional group may include "a" to "b" carbon atoms. In addition, in this specification, unless otherwise defined, "substitution" means that at least one hydrogen bonded to carbon is replaced with an element other than hydrogen, for example, it means replacement with an alkyl group having 1 to 5 carbon atoms or a fluorine element. In this specification, the average particle diameter (D 50 ) can be defined as the particle size corresponding to 50% of the volume accumulation in the particle size distribution curve. The average particle size (D 50 ) can be measured, for example, using a laser diffraction method. The laser diffraction method can generally measure particle diameters from the submicron range to several mm, and can obtain results with high reproducibility and high resolution. Hereinafter, the present invention will be described in more detail. Electrolyte of the dagger The present invention provides a non-aqueous electrolyte, specifically a non-aqueous electrolyte for a lithium secondary battery. More specifically, the non-aqueous electrolyte according to the present invention comprises a lithium salt; an organic solvent; and an additive; and is characterized in that the additive comprises a compound represented by the following chemical formula 1. [Chemical Formula 1] In the above chemical formula 1, R1 is a substituent represented by the following chemical formula 2, L1 is a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, R2 is hydrogen or a substituent represented by the following chemical formula 3, and R a, R b and R c are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN. [Chemical formula 2] In the above chemical formula 2, m is 1 or 2, X1 and X2 are each independently -O- or -C(R 31 )(R 32 )-, but at least one of the above X1 and X2 is -O-, and R 31 Inland R 36 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R4 or -R5-OC(=O)-R6, wherein R4 and R6 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, wherein R5 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, and the substituents of L1, R4, R5 and R6 are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, and * represents a bonding site, R 31 , R 32 , R 33 , R 34 , R 35 , and R 36 Located in one of them. [Chemical Formula 3] In the above chemical formula 3, * is a bonding site and L2 is an alkylene group having 1 to 3 carbon atoms. The non-aqueous electrolyte of the present invention is characterized by containing a compound of a specific chemical formula having an imidazolium cation structure substituted with a cyclic sulfur oxide as an additive. When the compound is used as an additive, it can continuously contribute to the formation of a film of a positive electrode and a negative electrode even during long-term charge and discharge, so that the effects of improving long-term life performance, high-temperature durability, and thermal stability are excellent. Therefore, a lithium secondary battery containing the above-described non-aqueous electrolyte can have excellent life performance and high-temperature storage characteristics. In particular, when applied to a lithium secondary battery requiring high energy density and high-voltage operation, it can achieve significantly excellent life performance and high-temperature storage performance improvement. (1) Lithium salt First, let me explain lithium salts as follows. In the non-aqueous electrolyte for a lithium secondary battery according to one embodiment of the present invention, the lithium salt may be any of those commonly used in electrolytes for lithium secondary batteries without limitation, and for example, Li as a cation + , and the anion is F - , Cl - , Br - , I - , NO3 - , N(CN)2 - , BF4 - , ClO4 - , AlO4 - , AlCl4 - , PF6 - , SbF6 - , AsF6 - , B 10 Cl 10 - , BF2C2O4 - , BC4O8 - , PF4C2O4 - , PF2C4O8 - , (CF3)2PF4 - , (CF3)3PF3 - , (CF3)4PF2 - , (CF3)5PF - , (CF3)6P- , CF3SO3 - , C4F9SO3 - , CF3CF2SO3 - , (CF3SO2)2N - , (FSO2)2N - , CF3CF2(CF3)2CO - , (CF3SO2)2CH - , CH3SO3 - , CF3(CF2)7SO3 - , CF3CO2 - , CH3CO2 - , SCN - and (CF3CF2SO2)2N - At least one selected from the group consisting of LiCl, LiBr, LiI, LiBF4, LiClO4, LiAlO4, LiAlCl4, LiPF6, LiSbF6, LiAsF6, LiB 10 Cl 10 , LiBOB (LiB(C2O4)2), LiCF3SO3, LiTFSI (LiN(SO2CF3)2), LiFSI (LiN(SO2F)2), LiCH3SO3, LiCF3CO2, LiCH3CO2, and LiBETI (LiN(SO2CF2CF3)2). The lithium salt may specifically include a single substance or a mixture of two or more substances selected from the group consisting of LiBF4, LiClO4, LiPF6, LiBOB (LiB(C2O4)2), LiCF3SO3, LiTFSI (LiN(SO2CF3)2), LiFSI (LiN(SO2F)2), and LiBETI (LiN(SO2CF2CF3)2), and more specifically may include LiPF6. The above lithium salt may be appropriately changed within a generally usable range, but may be included in the electrolyte at a concentration of 0.8 M to 3.0 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. At this time, the unit “M” may mean molar concentration, specifically, “mol / L.” When the concentration of the lithium salt satisfies the above range, the viscosity of the non-aqueous electrolyte can be controlled to implement optimal impregnation properties, and the mobility of lithium ions can be improved, thereby obtaining the effect of improving the capacity characteristics and cycle characteristics of the lithium secondary battery. (2) Organic solvent The above organic solvent is a non-aqueous solvent commonly used in lithium secondary batteries, and is not particularly limited as long as decomposition due to oxidation reactions, etc. during the charge / discharge process of the secondary battery can be minimized. Specifically, the organic solvent may include at least one selected from the group consisting of a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, a linear ester-based organic solvent, and a cyclic ester-based organic solvent. Specifically, the organic solvent may include a cyclic carbonate-based organic solvent, a linear carbonate-based organic solvent, or a mixture thereof. The above cyclic carbonate-based organic solvent is a high-viscosity organic solvent having a high dielectric constant and capable of easily dissociating a lithium salt in the electrolyte, and specifically, may include at least one organic solvent selected from the group consisting of ethylene carbonate (EC), fluoroethylene carbonate (FEC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, and vinylene carbonate, and more specifically, may include at least one selected from the group consisting of ethylene carbonate (EC) and fluoroethylene carbonate (FEC). In addition, the linear carbonate-based organic solvent is an organic solvent having low viscosity and low dielectric constant, and specifically may include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethyl methyl carbonate (EMC), methyl propyl carbonate, and ethyl propyl carbonate, and more specifically may include at least one selected from the group consisting of ethyl methyl carbonate (EMC) and diethyl carbonate (DEC). The above organic solvent may be a mixture of a cyclic carbonate-based organic solvent and a linear carbonate-based organic solvent. At this time, the cyclic carbonate-based organic solvent and the linear carbonate-based organic solvent may be mixed in a volume ratio of 5:95 to 40:60, specifically, a volume ratio of 7:93 to 30:70. When the mixing ratio of the cyclic carbonate-based organic solvent and the linear carbonate-based organic solvent satisfies the above range, high dielectric constant and low viscosity characteristics can be simultaneously satisfied, and excellent ion conductivity characteristics can be implemented. In addition, the organic solvent may further include at least one carbonate organic solvent selected from the group consisting of the cyclic carbonate organic solvent and the linear carbonate organic solvent, and at least one ester organic solvent selected from the group consisting of the linear ester organic solvent and the cyclic ester organic solvent, in order to produce an electrolyte having high ionic conductivity. The above linear ester organic solvent may specifically include at least one selected from the group consisting of methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate. In addition, the cyclic ester organic solvent may specifically include at least one selected from the group consisting of γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, and ε-caprolactone. Meanwhile, the organic solvent may be used without limitation by adding an organic solvent commonly used in a non-aqueous electrolyte as needed. For example, at least one organic solvent from among an ether-based organic solvent, a glyme-based solvent, and a nitrile-based organic solvent may be additionally included. As the above ether solvent, any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methyl propyl ether, ethyl propyl ether, 1,3-dioxolane (DOL), and 2,2-bis(trifluoromethyl)-1,3-dioxolane (TFDOL) or a mixture of two or more thereof may be used, but is not limited thereto. The above-mentioned glyme solvent has a high dielectric constant and low surface tension compared to linear carbonate-based organic solvents, and is a solvent with low reactivity with metals, and may include at least one selected from the group consisting of dimethoxyethane (glyme, DME), diethoxyethane, diglyme, tri-glyme, and tetra-glyme (TEGDME), but is not limited thereto. The above nitrile solvent may be at least one selected from the group consisting of acetonitrile, propionitrile, butyronitrile, valeronitrile, caprylonitrile, heptanenitrile, cyclopentane carbonitrile, cyclohexane carbonitrile, 2-fluorobenzonitrile, 4-fluorobenzonitrile, difluorobenzonitrile, trifluorobenzonitrile, phenylacetonitrile, 2-fluorophenylacetonitrile, and 4-fluorophenylacetonitrile, but is not limited thereto. (3) Additives The above additive comprises a compound represented by the following chemical formula 1. [Chemical Formula 1] In the above chemical formula 1, R1 is a substituent represented by the following chemical formula 2, L1 is a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, R2 is hydrogen or a substituent represented by the following chemical formula 3, and R a , R b and R c are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN. [Chemical formula 2] In the above chemical formula 2, m is 1 or 2, X1 and X2 are each independently -O- or -C(R 31 )(R 32 )-, but at least one of the above X1 and X2 is -O-, and R 31 Inland R 36are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R4 or -R5-OC(=O)-R6, wherein R4 and R6 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, wherein R5 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, and the substituents of L1, R4, R5 and R6 are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, and * represents a bonding site, R 31 , R 32 , R 33 , R 34 , R 35 , and R 36 Located in one of them. [Chemical Formula 3] In the above chemical formula 3, * is a bonding site and L2 is an alkylene group having 1 to 3 carbon atoms. The compound represented by the above chemical formula 1 is characterized by containing a compound of a specific chemical formula having an imidazolium cation structure substituted with cyclic sulfur oxide as an additive. The compound is a hetero compound having a cyclic structure in which carbon and nitrogen exist in the structure, and since an electron-rich nitrogen element exists in the structure, electrons can be evenly arranged in the cyclic structure, so that the cyclic structure of the cyclic sulfur oxide can be maintained without immediately ring-opening during charge and discharge. The compound represented by the above chemical formula 1 having such a characteristic can continuously contribute to the formation of films on the positive and negative electrodes during long-term charge and discharge. In particular, in the case of a positive electrode having a high energy density or a positive electrode requiring high-voltage operation, a decrease in the thermal stability of the positive electrode or an electrolyte side reaction at the positive electrode is a problem, and this can be caused by a decrease in the durability of the film or a breakage of the film during long-term operation of the positive electrode. The compound represented by the above chemical formula 1 can continuously contribute to the formation of a positive electrode film during charge and discharge of a lithium secondary battery, and thus has excellent effects in improving long-term life performance, high-temperature durability, and thermal stability. Therefore, a lithium secondary battery including the aforementioned non-aqueous electrolyte can have excellent life performance and high-temperature storage characteristics. In addition, since the compound represented by the above chemical formula 1 has an imidazolium cation in its parent structure, it suppresses the generation of Lewis acids such as HF and PF5, and at the same time, since the nitrogen element acts as a Lewis base to remove the Lewis acid generated in the electrolyte, it is possible to suppress the deterioration behavior of the film on the surface of the positive or negative electrode caused by the Lewis acid, and prevent additional electrolyte decomposition due to this. As a result, self-discharge of a lithium secondary battery can be alleviated, thereby improving high-temperature storage characteristics. In the above chemical formula 1, R1 is a substituent represented by the following chemical formula 2. [Chemical formula 2] In the above chemical formula 2, m can be 1 or 2. Specifically, m can be 2. X1 and X2 are each independently -O- or -C(R 31 )(R 32 )-, but at least one of X1 and X2 is -O-. Specifically, X1 is -O- or and X2 is -C(R 31 )(R 32 ) - it could be. R 31 Inland R 36 may each independently be hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R4 or -R5-OC(=O)-R6. The R4 and R6 may each independently be a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, specifically a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms; an alkenyl group having 2 to 20 carbon atoms, specifically an alkenyl group having 2 to 5 carbon atoms; an alkynyl group having 2 to 20 carbon atoms, specifically an alkynyl group having 2 to 5 carbon atoms; or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, specifically an aryl group having 6 to 10 carbon atoms. The R5 may be a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, specifically a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms. When a substituent is present in the above L1, R4, R5 and R6, the substituents of the above L1, R4, R5 and R6 may each independently be at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3. Specifically, R 31 Inland R 36 can be hydrogen. In the above chemical formula 2, * represents R as a binding site. 31 , R 32 , R 33 , R 34 , R 35 , and R 36 can be located in one of the following. In this case, * is R 31 , R 32 , R33 , R 34 , R 35 , or R 36 It is said to be located at R 31 , R 32 , R 33 , R 34 , R 35 , or R 36 There is no hydrogen or other substituent in R 31 , R 32 , R 33 , R 34 , R 35 , or R 36 This may mean that the carbon adjacent to L1 is directly bonded. The substituent represented by the above chemical formula 2 may be any one selected from the substituents consisting of CS-1 to CS-15 below. When the substituents of CS-1 to CS-15 are applied as R1 of the chemical formula 1, the overall compound has excellent structural stability and can smoothly perform its function as an additive. Specifically, the substituent represented by the above chemical formula 2 may be any one selected from the group consisting of CS-1, CS-2, CS-5, CS-8, CS-10, and CS-11 in terms of structural stability and ease of synthesis. More specifically, specifically, the substituent represented by the above chemical formula 2 may be CS-8. In the above chemical formula 1, L1 may be a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, specifically, it may be a direct bond, a methylene group or an ethylene group, and more specifically, it may be a methylene group in terms of facilitating the synthesis of the compound and suppressing the decomposition of the compound after synthesis. In the above chemical formula 1, R2 can be hydrogen or a substituent represented by the following chemical formula 3. [Chemical Formula 3] The substituent represented by the above chemical formula 3 contains a propargyl functional group that is easily reduced at the terminal, so that an electrode film having high passivation ability can be formed, thereby preventing additional reduction decomposition reactions caused by instability of the film, and improving the high-temperature durability of the electrode. In addition, the propargyl group included in the substituent represented by the above chemical formula 3 can be adsorbed on the surface of metallic impurities included in the positive electrode, thereby suppressing the elution of the impurities, thereby suppressing the deposition of metal ions on the negative electrode surface, thereby preventing internal short circuits. L2 may be an alkylene group having 1 to 3 carbon atoms, specifically a methylene group or an ethylene group, more specifically a methylene group. In the above chemical formula 1, R a , R b and R c can each independently be hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN, and specifically, can each independently be hydrogen or an alkyl group having 1 to 2 carbon atoms, and more specifically, can each be hydrogen. Specifically, the compound represented by the chemical formula 1 may include at least one of the compounds represented by the following chemical formula 1-1 and the following chemical formula 1-2. More specifically, the compound represented by the chemical formula 1 may include the compound represented by the following chemical formula 1-1 and the compound represented by the following chemical formula 1-2. [Chemical Formula 1-1] [Chemical Formula 1-2] In the above chemical formulas 1-1 and 1-2, R a , R b , R c , R1, L1 and L2 are as defined in the chemical formula 1. Specifically, the compound represented by the chemical formula 1 may include at least one of the compounds represented by the following chemical formula 1-A and the following chemical formula 1-B. More specifically, the compound represented by the chemical formula 1 may include the compound represented by the following chemical formula 1-A and the compound represented by the following chemical formula 1-B. [Chemical Formula 1-A] [Chemical Formula 1-B] In the above chemical formula 1-A and chemical formula 1-B, R a , R b and R c is as defined in the chemical formula 1 above. Specifically, the compound represented by the chemical formula 1 may include at least one of the compounds represented by the following chemical formula 1-a and the following chemical formula 1-b. More specifically, the compound represented by the chemical formula 1 may include the compound represented by the following chemical formula 1-a and the compound represented by the following chemical formula 1-b. [Chemical formula 1-a] [Chemical formula 1-b] The compound represented by the above chemical formula 1 may be included in the non-aqueous electrolyte at 0.01 wt% to 10 wt%, specifically at 0.1 wt% to 5 wt%, more specifically at 0.5 wt% to 3 wt%, even more specifically at 0.2 wt% to 1 wt%, and even more specifically at 0.5 wt% to 1 wt%. When it is within the above range, it is preferable in that the effect of improving the high-temperature durability of the secondary battery described above is expressed while preventing an increase in resistance due to excessive use of additives. The additive may further include at least one compound selected from the group consisting of a compound represented by the following chemical formula 4 and a compound represented by the following chemical formula 5, together with the compound represented by the above chemical formula 1. Specifically, the additive may further include a compound represented by the following chemical formula 4 and a compound represented by the following chemical formula 5, together with the compound represented by the above chemical formula 1. The above additive may further include a compound represented by the following chemical formula 4. [Chemical Formula 4] In the above chemical formula 4, R a1 , R b1 and R c1 are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN, and L 21 is an alkylene group having 1 to 3 carbon atoms. In addition, the compound represented by the chemical formula 4 can suppress the generation of Lewis acids such as HF and PF5 through the imidazole group contained therein, and at the same time, the nitrogen element acts as a Lewis base to remove the Lewis acid generated in the electrolyte, so that the deterioration behavior of the film on the surface of the positive or negative electrode caused by the Lewis acid can be suppressed, and additional electrolyte decomposition caused by this can be prevented. As a result, the self-discharge of the lithium secondary battery can be alleviated, and the high-temperature storage characteristics can be improved. In addition, since the compound represented by the above chemical formula 4 contains a propargyl functional group that is easily reduced at the terminal, it can form an electrode film with high passivation ability, thereby preventing additional reduction decomposition reactions caused by instability of the film, and improving the high-temperature durability of the electrode. In addition, the propargyl group included in the compound represented by the above chemical formula 4 can be adsorbed on the surface of metallic impurities included in the positive electrode, thereby suppressing the elution of the impurities, thereby suppressing the deposition of metal ions on the negative electrode surface, and thus preventing internal short circuit. In the above chemical formula 4, R a1 , R b1 and R c1 are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN, and specifically, each can be independently hydrogen or an alkyl group having 1 to 2 carbon atoms, and more specifically, each can be hydrogen. L 21 may be an alkylene group having 1 to 3 carbon atoms, specifically a methylene group or an ethylene group, and more specifically a methylene group. Specifically, the compound represented by the chemical formula 4 may include a compound represented by the following chemical formula 4-1. [Chemical Formula 4-1] When the compound represented by the above chemical formula 4 is included in the non-aqueous electrolyte, the compound represented by the above chemical formula 4 may be included in the non-aqueous electrolyte in an amount of 0.01 wt% to 10 wt%, and specifically, in an amount of 0.1 wt% to 5 wt%. The above additive may further include a compound represented by the following chemical formula 5. [Chemical Formula 5] In the above chemical formula 5, n is 1 or 2, and L 11 and L 12 are each independently a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, and R 11 and R 12 are each independently a substituent represented by the following chemical formula 6. [Chemical formula 6] In the above chemical formula 6, m1 is 1 or 2, and X 11 is and X 21 are each independently -O- or -C(R 311 )(R 321 ) - but, the above X 11 and X 21 At least one of them is -O-, and R 311 , R 321 , R 331 , R 341 , R 351 and R 361 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R 41 or -R 51 -OC(=O)-R 61 And, the above R 41 and R 61 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, and R 51is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, and L 11 , L 21 , R 41 , R 51 and R 61 The substituents of are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, and * is a bonding site for R. 311 , R 321 , R 331 , R 341 , R 351 , and R 361 Located in one of the L 11 and L 21 If all are direct bonds, R 11 and R 21 is not CS1-7 at the same time, but L 11 and L 21 When all are methylene groups and n is 2, R 11 and R 21 is not CS1-2 at the same time. The compound represented by the above chemical formula 5 is characterized by including a sulfur oxide structure at the center, while at least one of both terminals has a cyclic sulfur oxide structure. By employing this chemical structure, when applied as a non-aqueous electrolyte additive, it can induce stable formation of anions, and further, it can enable the formation of a stable SEI layer. In the above chemical formula 5, n is 1 or 2, and specifically can be 2. L 11 and L 12 Each of may independently be a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, and specifically, each of may independently be a methylene group or an ethylene group, and more specifically, each of may be a methylene group. R 11 and R 12are each independently a substituent represented by the chemical formula 6. In the above chemical formula 6, m1 can be 1 or 2, and specifically can be 2. X 11 is and X 21 are each independently -O- or -C(R 311 )(R 321 ) - but, the above X 11 and X 21 At least one of them is -O-. Specifically, X 11 is -O- or and X 21 is -C(R 311 )(R 321 ) - it could be. R 311 , R 321 , R 331 , R 341 , R 351 and R 361 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R 41 or -R 51 -OC(=O)-R 61 It can be. The above R 41 and R 61 may be each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, specifically a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms; an alkenyl group having 2 to 20 carbon atoms, specifically an alkenyl group having 2 to 5 carbon atoms; an alkynyl group having 2 to 20 carbon atoms, specifically an alkynyl group having 2 to 5 carbon atoms; or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, specifically an aryl group having 6 to 10 carbon atoms; 51 L may be a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, specifically a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms. 11 , R 41 , R 51 and R 61 If a substituent is present in L, 11 , R 41 , R51 and R 61 The substituents of may be independently one or more selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3. Specifically, R 311 , R 321 , R 331 , R 341 , R 351 and R 361 can be hydrogen. In the above chemical formula 6, * is a binding site R 311 , R 321 , R 331 , R 341 , R 351 and R 361 can be located in one of the following. In this case, * is R 311 , R 321 , R 331 , R 341 , R 351 or R 361 It is said to be located at R 311 , R 321 , R 331 , R 341 , R 351 and R 361 There is no hydrogen or other substituent in R 311 , R 321 , R 331 , R 341 , R 351 and R 361 Carbon adjacent to L 11 or L 21 This could mean direct coupling. The substituent represented by the chemical formula 6 above may be any one selected from the substituents consisting of CS1-1 to CS1-15 below. The substituents of CS1-1 to CS1-15 are R of chemical formula 6. 11 or R 12When applied, the overall compound has excellent structural stability while also being able to smoothly perform its function as an additive. Specifically, the substituent represented by the chemical formula 6 may be any one selected from the group consisting of CS1-1, CS1-2, CS1-5, CS1-8, CS1-10, and CS1-11 in terms of structural stability and ease of synthesis. More specifically, the substituent represented by the chemical formula 6 may be CS1-8. More specifically, the compound represented by the chemical formula 5 may include at least one compound selected from the group consisting of compounds A to Q below. More specifically, the compound represented by the chemical formula 5 may include at least one compound selected from the group consisting of compound A, compound F, and compound J below. More specifically, the compound represented by the chemical formula 5 may include a compound represented by the chemical formula A below. . When the compound represented by the above chemical formula 5 is included in the non-aqueous electrolyte, the compound represented by the above chemical formula 5 may be included in the non-aqueous electrolyte in an amount of 0.01 wt% to 10 wt%, and specifically, in an amount of 0.1 wt% to 5 wt%. The method for producing the compound represented by the above chemical formula 1 is not particularly limited, and for example, it may be produced by reacting an imidazole compound with a cyclic sulfur oxide-based compound capable of forming an imidazolium cation compound by bonding a cyclic sulfur oxide functional group to a nitrogen position of the imidazole compound by reacting with the imidazole-based compound. For example, it may be produced by reacting a compound represented by the above chemical formula 4 and a compound represented by the above chemical formula 5 to form a compound in the form of an imidazolium cation in which a cyclic sulfur oxide is substituted. The compound represented by the above chemical formula 5 may be produced by reacting an imidazolium cation (R) group with a cyclic sulfur oxide (R). 11 or R 12 ) can easily react with the nitrogen of the imidazole group in the compound represented by the chemical formula 4 because -SO4-, --SO3-, etc., which can perform the role of a leaving group, are bonded. The compound represented by the chemical formula 4 and the compound represented by the compound 5 can form a compound represented by the chemical formula 1, or a part of these compounds can form a compound represented by the chemical formula 1, depending on the adjustment of the equivalent amount during the reaction. On the other hand, when the compound represented by the chemical formula 4 reacts with 1,3-propanesultone (PS), the unshared electron pair of imidazole opens the 1,3-propanesultone, making it difficult to implement the compound of the chemical formula 1. More specifically, the compound represented by the chemical formula 1 can be manufactured or formed by adding the compound represented by the chemical formula 4 and the compound represented by the chemical formula 5 to an organic solvent or a non-aqueous electrolyte, and then allowing a spontaneous reaction of these compounds. Alternatively, the compound represented by the chemical formula 1 can be manufactured or formed by adding the compound represented by the chemical formula 4 and the compound represented by the chemical formula 5 to an organic solvent or a non-aqueous electrolyte, and then sufficiently aging or allowing the compounds to react at room temperature (15°C to 25°C). The above additive may further include an additional additive together with the compound represented by Chemical Formula 1. The above additional additive may be included in the non-aqueous electrolyte to prevent decomposition of the non-aqueous electrolyte in a high-power environment, causing cathode collapse, or to provide low-temperature high-rate discharge characteristics, high-temperature stability, overcharge prevention, and suppression of battery expansion at high temperatures. Specifically, the additional additive may include at least one selected from the group consisting of lithium difluorophosphate (LiDFP), vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, propane sultone, propene sultone, succinonitrile, adiponitrile, ethylene sulfate, lithium bis-(oxalato)borate (LiBOB), 3-trimethoxysilanyl-propyl-N-aniline (TMSPa), and tris(trimethylsilyl) phosphate (TMSPi), and specifically, lithium difluorophosphate (LiDFP). The above additional additive may be included in the non-aqueous electrolyte in an amount of 0.1 wt% to 15 wt%, more specifically 0.3 wt% to 10 wt%. Lithium secondary battery In addition, the present invention provides a lithium secondary battery. Specifically, the lithium secondary battery may include the non-aqueous electrolyte described above. More specifically, a lithium secondary battery according to the present invention is characterized by including a positive electrode; a negative electrode opposing the positive electrode; a separator interposed between the positive electrode and the negative electrode; and the non-aqueous electrolyte described above. The above lithium secondary battery can be manufactured by housing an electrode assembly including the positive electrode; an anode opposite the positive electrode; and a separator interposed between the positive electrode and the negative electrode in a battery case, and then injecting the above-described non-aqueous electrolyte. (1) Bipolar The above positive electrode may include a positive electrode active material. The above positive electrode active material is a compound capable of reversible intercalation and deintercalation of lithium, and specifically, may include a lithium-transition metal composite oxide including lithium and at least one transition metal selected from nickel, cobalt, manganese, and aluminum, preferably a lithium-transition metal composite oxide including lithium and a transition metal selected from nickel, cobalt, and manganese. For example, the lithium transition metal composite oxides include lithium-manganese oxides (e.g., LiMnO2, LiMn2O4, etc.), lithium-cobalt oxides (e.g., LiCoO2, etc.), lithium-nickel oxides (e.g., LiNiO2, etc.), lithium-nickel-manganese oxides (e.g., LiNi 1-Y Mn Y O2(here, 0 <Y<1), LiMn 2-z Ni z O4 (wherein, 0<Z<2) etc.), lithium-nickel-cobalt oxides (e.g., LiNi 1-Y1 Co Y1O2(here, 0 <Y1<1) 등), 리튬-망간-코발트계 산화물(예를 들면, LiCo 1-Y2 Mn Y2 O2(here, 0 <Y2<1), LiMn 2-z1 Co z1 O4 (wherein, 0<Z1<2) etc.), lithium-nickel-manganese-cobalt oxides (e.g., Li(Ni p Co q Mn r1 )O2(where, 0<p<1, 0<q<1, 0<r1<1, p+q+r1=1) or Li(Ni p1 Co q1 Mn r2 )O4 (wherein, 0<p1<2, 0<q1<2, 0<r2<2, p1+q1+r2=2) etc.), or lithium-nickel-cobalt-transition metal (M) oxide (e.g., Li(Ni p2 Co q2 Mn r3 M S2 )O2(wherein, M is selected from the group consisting of Al, Fe, V, Cr, Ti, Ta, Mg and Mo, and p2, q2, r3 and s2 are atomic fractions of independent elements, 0<p2<1, 0<q2<1, 0<r3<1, 0<s2<1, p2+q2+r3+s2=1), etc.), and one or more compounds of these may be included. Among these, the lithium transition metal composite oxide may be LiCoO2, LiMnO2, LiNiO2, lithium nickel-manganese-cobalt oxide (for example, Li(Ni 0.6 Mn 0.2 Co 0.2 )O2, Li(Ni 0.5 Mn 0.3 Co 0.2 )O2, Li(Ni 0.7 Mn 0.15 Co 0.15 )O2 or Li(Ni 0.8 Mn 0.1 Co 0.1)O2, etc.), or lithium nickel cobalt aluminum oxide (e.g., Li(Ni 0.8 Co 0.15 Al 0.05 )O2, etc.), and considering the remarkable improvement effect according to the control of the type and content ratio of the constituent elements forming the lithium transition metal composite oxide, the lithium transition metal composite oxide may be Li(Ni 0.6 Mn 0.2 Co 0.2 )O2, Li(Ni 0.5 Mn 0.3 Co 0.2 )O2, Li(Ni 0.7 Mn 0.15 Co 0.15 )O2 or Li(Ni 0.8 Mn 0.1 Co 0.1 )O2, etc., and one or a mixture of two or more of these may be used. More specifically, the positive electrode active material may include a lithium transition metal oxide represented by the following chemical formula P-1. [Chemical formula P-1] Li 1+x [Ni a Co b Mn c M 1 d ]O 2+w In the chemical formula P-1, 0≤x≤0.5, a+b+c+d = 1, 0.5≤a≤0.7, 0≤b≤0.15, c=1-abd, 0≤d≤0.1, 0≤b / a≤0.2, 1≤a / c≤3, 0≤w≤1, and M 1 is at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo. The compound represented by the above chemical formula P-1 needs to be driven at a high voltage (for example, 4.35 V or higher) to increase the energy density of the positive electrode since the nickel content is lower than that of the high-nickel lithium transition metal oxide. However, during such high-voltage driving, the positive electrode electrolyte side reaction is intensified, so that the life performance and storage performance are greatly reduced, and the high-temperature durability is lowered, which aggravates the problem of increased resistance. This is because the oxidation and decomposition of organic solvents (such as ethylene carbonate) are promoted during high-voltage driving, generating carbon dioxide (CO2), or because Lewis acids such as HF and PF5 formed by the decomposition of lithium salts (such as LiPF6) decompose the positive electrode film, dissolving the transition metal of the positive electrode active material and causing structural collapse. This problem can be solved by using the non-aqueous electrolyte described above. As described above, since the non-aqueous electrolyte described above can continuously provide a film that can improve the durability of the positive electrode, the problem of electrolyte side reactions that is a problem during long-term charge and discharge is significantly prevented, and thus the lithium secondary battery according to the present invention can exhibit remarkably excellent effects in long-term life performance and high-temperature storage performance. In the above chemical formula P-1, x may be 0≤x≤0.5, specifically 0≤x≤0.2. In the above chemical formula P-1, 0.5≤a≤0.7, specifically 0.55≤a≤0.65. In the chemical formula P-1, 0≤b≤0.15. b corresponds to the molar percentage of Co among the metals excluding lithium in the lithium transition metal oxide represented by the chemical formula A. According to the present invention, by lowering the Co content, there is a cost advantage, and by relatively increasing the proportion of Mn, the structural stability of the positive electrode active material can be improved. Specifically, in the chemical formula P-1, 0≤b≤0.1 may be satisfied. In the chemical formula P-1 above, 0≤b / a≤0.2. If b / a exceeds 0.2, the ratio of Co in the transition metal may be very high, which may increase the irreversibility within the structure. Specifically, in the chemical formula P-1 above, 0.05≤b / a≤0.2 may be satisfied. In the chemical formula P-1 above, c = 1-abd, and 1 ≤ a / c ≤ 3. c corresponds to the molar percentage of Mn among the metals excluding lithium in the lithium transition metal oxide represented by the chemical formula P-1 above, and according to the present invention, the molar ratio of Ni to Mn is adjusted to 1 ≤ a / c ≤ 3, thereby improving the structural stability of the positive electrode active material. Specifically, it may be 1.5 ≤ a / c ≤ 2.5. In the above chemical formula P-1, M 1 can be understood as a doping element of a lithium transition metal oxide, and specifically, it can be at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo. At this time, d can be 0≤d≤0.1, specifically, 0≤d≤0.05. In another aspect, the positive electrode active material may include a lithium composite transition metal oxide represented by the following chemical formula P-2. [Chemical formula P-2] Li 1+x1 (Ni a1 Co b1 Mn c1 M 2 d1 )O2 In the above chemical formula P-2, M 2is at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B and Mo, and 1+x1, a1, b1, c1 and d1 are atomic fractions of independent elements, respectively, 0≤x1≤0.2, 0.50≤a1<1, 0 <b1≤0.25, 0<c1≤0.25, 0≤d1≤0.1, a1+b1+c1+d1=1이다. Preferably, a1, b1, c1, and d1 may be 0.70≤a1≤0.95, 0.025≤b1≤0.20, 0.025≤c1≤0.20, and 0≤d1≤0.05, respectively. In addition, a1, b1, c1, and d1 may be 0.80≤a1≤0.95, 0.025≤b1≤0.15, 0.025≤c1≤0.15, and 0≤d1≤0.05, respectively. In addition, a1, b1, c1, and d1 may be 0.85≤a1≤0.90, 0.05≤b1≤0.10, 0.05≤c1≤0.10, and 0≤d1≤0.03, respectively. The above positive electrode may include a positive electrode current collector; and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector. In this case, the positive electrode active material may be included in the positive electrode active material layer. The positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. Specifically, the positive electrode current collector may include at least one selected from the group consisting of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, and an aluminum-cadmium alloy, preferably aluminum. The thickness of the above positive electrode collector can typically have a thickness of 3 to 500 μm. The above-mentioned positive electrode current collector may form fine irregularities on the surface to strengthen the bonding strength of the positive electrode active material. For example, the above-mentioned positive electrode current collector may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, a non-woven fabric, etc. The above positive electrode active material layer can be disposed on at least one side of the positive electrode current collector, specifically, on one side or both sides of the positive electrode current collector. The above-mentioned positive electrode active material may be included in the positive electrode active material layer at 80 to 99 wt%, preferably 92 to 98.5 wt%, taking into account sufficient capacity of the positive electrode active material. Description of other positive electrode active materials is omitted as it has been described above. The above positive electrode active material layer may further include a binder and / or a conductive material together with the positive electrode active material. The above binder is a component that assists in the binding of the active material and the conductive material and the binding to the current collector, and specifically, may include at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, and fluororubber, preferably polyvinylidene fluoride. The above binder may be included in the positive electrode active material layer at 1 to 20 wt%, preferably 1.2 to 10 wt%, in order to sufficiently secure binding force between components such as the positive electrode active material. The conductive material may be used to assist and improve conductivity in a secondary battery, and is not particularly limited as long as it has conductivity without causing a chemical change. Specifically, the positive electrode conductive material may include at least one selected from the group consisting of graphite such as natural graphite or artificial graphite; carbon black such as carbon black, acetylene black, Ketjen black, channel black, paneth black, lamp black, thermal black, etc.; conductive fibers such as carbon fibers or metal fibers; conductive tubes such as carbon nanotubes; fluorocarbons; metal powders such as aluminum or nickel powder; conductive whiskers such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; and polyphenylene derivatives, and preferably, the positive electrode conductive material may include carbon nanotubes in terms of improving conductivity. The above-mentioned conductive material may be included in the positive electrode active material layer at 1 wt% to 20 wt%, preferably 1.2 wt% to 10 wt%, in order to sufficiently secure electrical conductivity. The thickness of the above positive electrode active material layer may be 30 ㎛ to 400 ㎛, preferably 40 ㎛ to 200 ㎛. The above positive electrode can be manufactured by coating a positive electrode slurry including a positive electrode active material and optionally a binder, a conductive material, and a solvent for forming a positive electrode slurry on the positive electrode current collector, and then drying and rolling. The solvent for forming the positive electrode slurry may include an organic solvent such as NMP (N-methyl-2-pyrrolidone). The solid content of the positive electrode slurry may be 40 wt% to 90 wt%, specifically 50 wt% to 80 wt%. (2) Cathode The above cathode can be opposed to the above anode. The above negative electrode may include a negative electrode active material. The above negative active material is a material capable of reversibly inserting / deleting lithium ions, and may include at least one selected from the group consisting of a carbon-based active material, a (semi)metal-based active material, and lithium metal, and specifically may include at least one selected from a carbon-based active material and a (semi)metal-based active material. The above carbon-based active material may include at least one selected from the group consisting of graphite, hard carbon, soft carbon, carbon black, graphene, and fibrous carbon, and preferably may include graphite. The graphite may be, for example, at least one of artificial graphite and natural graphite. The average particle diameter (D) of the above carbon-based active material 50 ) may be 10 ㎛ to 30 ㎛, preferably 15 ㎛ to 25 ㎛, in order to ensure structural stability during charging and discharging and reduce side reactions with the electrolyte. Specifically, the (semi)metal-based active material may include at least one (semi)metal selected from the group consisting of Cu, Ni, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, V, Ti, and Sn; an alloy of lithium and at least one (semi)metal selected from the group consisting of Cu, Ni, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, V, Ti, and Sn; an oxide of at least one (semi)metal selected from the group consisting of Cu, Ni, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, V, Ti, and Sn; lithium titanium oxide (LTO); lithium vanadium oxide; etc. More specifically, the (semi)metal-based active material may include a silicon-based active material. The above silicon-based active material is SiO xIt may include a compound represented by (0≤x<2). In the case of SiO2, since it does not react with lithium ions and thus cannot store lithium, it is preferable that x is within the above range, and more preferably, the silicon-based active material may be SiO. The average particle diameter (D) of the above silicon-based active material 50 ) may be 1 ㎛ to 30 ㎛, preferably 2 ㎛ to 15 ㎛, in order to reduce side reactions with the electrolyte while ensuring structural stability during charging and discharging. The above negative electrode may include a negative electrode current collector; and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. In this case, the negative electrode active material may be included in the negative electrode active material layer. The above negative electrode current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. Specifically, the negative electrode current collector may be made of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface-treated with carbon, nickel, titanium, silver, etc., an aluminum-cadmium alloy, etc. The above negative electrode collector may typically have a thickness of 3 to 500 μm. The above negative electrode current collector may form fine irregularities on the surface to strengthen the bonding strength of the negative electrode active material. For example, the above negative electrode current collector may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, a non-woven fabric, etc. The above negative electrode active material layer may be disposed on at least one surface of the negative electrode current collector, specifically, one surface or both surfaces of the negative electrode current collector. The above negative active material may be included in the negative active material layer in an amount of 60 to 99 wt%, preferably 75 to 95 wt%. Description of other positive electrode active materials is omitted as it has been described above. The above negative electrode active material layer may further include a binder and / or a conductive material together with the negative electrode active material. The above binder is used to improve the performance of the battery by improving the adhesion between the negative electrode active material layer and the negative electrode current collector, and may include, for example, at least one selected from the group consisting of polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinylidene fluoride (PVDF), polyacrylonitrile, polymethylmethacrylate, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, polyacrylic acid, ethylene-propylene-diene monomer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluororubber, and materials in which hydrogens of these are substituted with Li, Na or Ca, etc., and also may include various copolymers thereof. may include: The above binder may be included in the negative electrode active material layer in an amount of 0.5 wt% to 10 wt%, preferably 1 wt% to 5 wt%. The conductive material is not particularly limited as long as it is conductive and does not cause a chemical change in the battery, and for example, graphite such as natural graphite or artificial graphite; carbon black such as carbon black, acetylene black, Ketjen black, channel black, paneth black, lamp black, thermal black, etc.; conductive fibers such as carbon fibers or metal fibers; conductive tubes such as carbon nanotubes; fluorocarbon; metal powder such as aluminum or nickel powder; conductive whiskers such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc. can be used. The above-mentioned conductive agent may be included in the negative electrode active material layer in an amount of 0.5 wt% to 10 wt%, preferably 1 wt% to 5 wt%. The thickness of the above negative active material layer may be 10 µm to 200 µm, preferably 20 µm to 150 µm. The above negative electrode can be manufactured by coating a negative electrode slurry including a negative electrode active material, a binder, a conductive material and / or a solvent for forming a negative electrode slurry on at least one surface of a negative electrode current collector, and then drying and rolling. The solvent for forming the negative electrode slurry may include at least one selected from the group consisting of distilled water, NMP (N-methyl-2-pyrrolidone), ethanol, methanol, and isopropyl alcohol, preferably distilled water, in order to facilitate dispersion of the negative electrode active material, binder, and / or conductive agent, for example. The solid content of the negative electrode slurry may be 30 wt% to 80 wt%, specifically 40 wt% to 70 wt%. (3) Membrane The above separator may be interposed between the anode and the cathode. In addition, as a separator, a conventional porous polymer film that has been conventionally used as a separator, for example, a porous polymer film made of a polyolefin polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, and an ethylene / methacrylate copolymer, may be used alone or in a laminated manner, or a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high-melting-point glass fiber, polyethylene terephthalate fiber, etc. may be used, but is not limited thereto. In addition, a coated separator containing a ceramic component or a polymer material to secure heat resistance or mechanical strength may be used, and may optionally be used in a single-layer or multi-layer structure. There is no particular limitation on the external shape of the lithium secondary battery of the present invention, but it may be in the shape of a cylinder, a square, a pouch, or a coin using a can. Hereinafter, the present invention will be described in more detail through specific examples. However, the following examples are merely examples to help understand the present invention and do not limit the scope of the present invention. It will be obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present description, and it is natural that such changes and modifications fall within the scope of the appended patent claims. Examples and Comparative Examples Example 1 (Manufacture of non-aqueous electrolyte) A mixture of ethylene carbonate (EC) and ethyl methyl carbonate (EMC) in a volume ratio of 20:80 was used as an organic solvent. A non-aqueous electrolyte was prepared by adding LiPF6 as a lithium salt, a compound represented by the chemical formula 4-1 as an additive, and the compound A to the organic solvent. The above LiPF6 was included in the non-aqueous electrolyte at a molar concentration of 1.2 M. The compound represented by the above chemical formula 4-1 was included in the non-aqueous electrolyte at a content of 1 wt%. The above compound A was included in the non-aqueous electrolyte at a content of 1 wt%. The above non-aqueous electrolyte was aged at room temperature for 72 hours, and the compound represented by the above chemical formula 4-1 and the above compound A were reacted with each other. The components in the non-aqueous electrolyte aged for 72 hours were 1 As a result of analysis using H-NMR and LC-MS, the compound represented by the chemical formula 1-a and the compound represented by the chemical formula 1-b were formed at 0.5 wt% in the non-aqueous electrolyte, the compound represented by the chemical formula 4-1 remained at 0.75 wt% in the non-aqueous electrolyte, and the compound A remained at 0.7 wt% in the non-aqueous electrolyte. (Lithium secondary battery manufacturing) Cathode active material (Li[Ni 0.6 Co 0.1 Mn 0.3 ]O2): Conductive (carbon nanotube): Binder (PVDF) was added to the solvent N-methyl-2-pyrrolidone (NMP) in a weight ratio of 97.74:0.70:1.56 to prepare a positive electrode mixture slurry (solid content 75.5 wt%). The positive electrode mixture slurry was applied to one surface of a positive electrode current collector (Al thin film) having a thickness of 12 μm, and dried and roll pressed to form a positive electrode active material layer (thickness: 136.6 μm), which was used as a positive electrode. A negative electrode mixture slurry (solid content 26 wt%) was prepared by adding negative active material (natural graphite): conductive agent (carbon black): binder (SBR-CMC) to distilled water as a solvent in a weight ratio of 96.15:1.55:2.30. The negative electrode mixture slurry was applied to one surface of a negative electrode current collector (Cu thin film) having a thickness of 8 ㎛, and drying and roll pressing were performed to prepare a negative electrode. A polyethylene porous film separator was interposed between the positive and negative electrodes manufactured above in a dry room, and then the non-aqueous electrolyte manufactured above was injected to manufacture a secondary battery. Example 2 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound A was added to the non-aqueous electrolyte in an amount of 5 wt% instead of 1 wt%. After aging the non-aqueous electrolyte at room temperature for 72 hours, the compound represented by the chemical formula 4-1 and the compound A reacted with each other to form 0.5 wt% of the compound represented by the chemical formula 1-a and the compound represented by the chemical formula 1-b. 0.75 wt% of the compound represented by the chemical formula 4-1 remained, and 4.75 wt% of the compound A remained. Example 3 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound A was added to the non-aqueous electrolyte in an amount of 0.5 wt% instead of 1 wt%. After aging the non-aqueous electrolyte at room temperature for 72 hours, the compound represented by the chemical formula 4-1 and the compound A reacted with each other to form 0.2 wt% of the compound represented by the chemical formula 1-a and the compound represented by the chemical formula 1-b. 0.9 wt% of the compound represented by the chemical formula 4-1 remained, and 0.4 wt% of the compound A remained. Example 4 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound represented by the compound 4-1 was added to the non-aqueous electrolyte in an amount of 5 wt% instead of 1 wt%. After aging the non-aqueous electrolyte at room temperature for 72 hours, the compound represented by the chemical formula 4-1 and the compound A reacted with each other to form 0.5 wt% of the compound represented by the chemical formula 1-a and the compound represented by the chemical formula 1-b. 4.75 wt% of the compound represented by the chemical formula 4-1 remained, and 0.75 wt% of the compound A remained. Example 5 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound represented by the compound 4-1 was added to the non-aqueous electrolyte at 0.5 wt% instead of 1 wt%. After aging the non-aqueous electrolyte at room temperature for 72 hours, the compound represented by the chemical formula 4-1 and the compound A reacted with each other to form 0.2 wt% of the compound represented by the chemical formula 1-a and the compound represented by the chemical formula 1-b. 0.4 wt% of the compound represented by the chemical formula 4-1 remained, and 0.9 wt% of the compound A remained. Comparative Example 1 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound represented by the chemical formula 4-1 and the compound A were not added to the non-aqueous electrolyte. Comparative Example 2 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound represented by the chemical formula 4-1 was not added to the non-aqueous electrolyte. Comparative Example 3 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the compound A was not added to the non-aqueous electrolyte. Comparative Example 4 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that 1 wt% of 1,3-propane sultone (PS) was added instead of 1 wt% of the compound A in the non-aqueous electrolyte. Experimental example Experimental Example 1: Evaluation of High Temperature Cycle Performance The lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 4 above were charged to 4.4 V, 0.05 C using an electrochemical charger / discharger under CC / CV, 0.33 C conditions at 45°C, and then discharged to 2.5 V under CC, 0.33 C conditions, which was considered one cycle, to perform 200 charge / discharge cycles. (1) Capacity maintenance rate The capacity retention rate is calculated using the formula below, and the results are shown in Table 1 below. Capacity retention rate (%) = {(discharge capacity after 200 cycles / discharge capacity after 1 cycle)} Х 100 (2) Resistance increase rate After one cycle of charge and discharge, the discharge capacity after one cycle was measured using an electrochemical charger / discharger, the SOC was adjusted to 50%, and then a 2.5C pulse was applied for 10 seconds, and the initial resistance was calculated through the difference between the voltage before and after pulse application. After 200 cycles of charge and discharge, the resistance after 200 cycles was calculated using the same method as above, and the resistance increase rate was calculated using the equation below, and the results are shown in Table 1 below. Resistance Increase Rate (%) = (Resistance after 200 cycles - Initial resistance) / Initial resistance × 100 Capacity retention rate (%) Resistance increase rate (%) Example 1958 Example 29410 Example 39511 Example 49612 Example 59510 Comparative Example 17236 Comparative Example 27630 Comparative Example 37728 Comparative Example 48025 Referring to Table 1, it can be confirmed that the lithium secondary batteries of Examples 1 to 5 using a non-aqueous electrolyte including a compound represented by Chemical Formula 1 exhibit superior high-temperature cycle performance compared to the comparative examples. Experimental Example 2: Evaluation of High Temperature Storage Performance The lithium secondary batteries manufactured in Examples 1 to 5 and Comparative Examples 1 to 4 above were charged to 4.4 V, 0.05 C under CC / CV, 0.33 C conditions at 25°C and discharged to 2.5 V under CC, 0.33 C conditions to perform initial charge / discharge, and then charged to 4.4 V, 0.05 C under CC / CV, 0.33 C conditions at 25°C and stored at 60°C for 8 weeks. (1) Capacity maintenance rate After 8 weeks of storage, the lithium secondary battery was charged to 4.4 V, 0.05 C under CC / CV, 0.33 C conditions at 25°C and discharged to 2.5 V under CC, 0.33 C to measure the capacity during discharge. The capacity retention rate was evaluated according to the following formula, and the results are shown in Table 2 below. Capacity retention (%) = (discharge capacity after 8 weeks of storage / initial discharge capacity) Х 100 (2) Resistance increase rate After the initial charge and discharge mentioned above, the capacity was checked at room temperature, then charged to 50% of SOC based on the discharge capacity, discharged for 10 seconds with a current of 2.5C, and the resistance was measured from the voltage drop difference at this time, which was used as the initial resistance. After 8 weeks of storage at 60℃, the resistance was measured using the same method, which was used as the final resistance, and the resistance increase rate was calculated using the following formula. The results are shown in Table 2 below. Resistance Increase Rate (%) = (Final Resistance - Initial Resistance) / (Initial Resistance) Х 100 Capacity retention rate (%) Resistance increase rate (%) Example 1949 Example 2919 Example 39311 Example 49110 Example 59210 Comparative Example 17032 Comparative Example 27324 Comparative Example 37225 Comparative Example 47920 Referring to Table 2, it can be confirmed that the lithium secondary batteries of Examples 1 to 5 using a non-aqueous electrolyte including a compound represented by Chemical Formula 1 exhibit superior high-temperature storage performance compared to the comparative examples.

Claims

1. Lithium salt; organic solvent; and containing additives; The above additive is a non-aqueous electrolyte comprising a compound represented by the following chemical formula 1: [Chemical Formula 1] In the above chemical formula 1, R1 is a substituent represented by the following chemical formula 2, L1 is a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, R2 is hydrogen or a substituent represented by the following chemical formula 3, R a , R b and R c are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN, [Chemical formula 2] In the above chemical formula 2, m is 1 or 2, X1 and X2 are each independently -O- or -C(R 31 )(R 32 )-but at least one of the above X1 and X2 is -O-, R 31 Inland R 36 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R4 or -R5-OC(=O)-R6, The above R4 and R6 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, The above R5 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, The substituents of the above L1, R4, R5 and R6 are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, * is R as a binding site 31 , R 32 , R 33 , R 34 , R 35 , and R 36 Located in one of the [Chemical Formula 3] In the above chemical formula 3, * is the binding site, L2 is an alkylene group having 1 to 3 carbon atoms.

2. In claim 1, The compound represented by the above chemical formula 1 is a non-aqueous electrolyte comprising at least one of the compounds represented by the following chemical formula 1-1 and the following chemical formula 1-2: [Chemical Formula 1-1] [Chemical Formula 1-2] In the above chemical formulas 1-1 and 1-2, R a , R b , R c , R1, L1 and L2 are as defined in the chemical formula 1.

3. In claim 1, L1 is a non-aqueous electrolyte with a methylene group.

4. In claim 1, A non-aqueous electrolyte in which the substituent represented by the chemical formula 2 is one selected from the substituents consisting of CS-1 to CS-15 below: .

5. In claim 1, A non-aqueous electrolyte, wherein the substituent represented by the chemical formula 2 is any one selected from the group consisting of CS-1, CS-2, CS-5, CS-8, CS-10, and CS-11.

6. In claim 1, L2 is a non-aqueous electrolyte with a methylene group.

7. In claim 1, The compound represented by the above chemical formula 1 is a non-aqueous electrolyte comprising at least one of the compounds represented by the following chemical formulas 1-A and 1-B: [Chemical Formula 1-A] [Chemical Formula 1-B] In the above chemical formula 1-A and chemical formula 1-B, R a , R b and R c is as defined in the chemical formula 1 above.

8. In claim 1, The compound represented by the above chemical formula 1 is a non-aqueous electrolyte comprising at least one of the compounds represented by the following chemical formulas 1-a and 1-b: [Chemical formula 1-a] [Chemical formula 1-b] .

9. In claim 1, The above additive is a non-aqueous electrolyte further comprising a compound represented by the following chemical formula 4: [Chemical Formula 4] In the above chemical formula 4, R a1 , R b1 and R c1 are each independently hydrogen, an alkyl group having 1 to 3 carbon atoms, or -CN, L 21 is an alkylene group having 1 to 3 carbon atoms.

10. In claim 1, The above additive is a non-aqueous electrolyte further comprising a compound represented by the following chemical formula 5: [Chemical Formula 5] In the above chemical formula 5, n is 1 or 2, L 11 and L 12 are each independently a direct bond or a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, R 11 and R 12 are each independently a substituent represented by the following chemical formula 6, [Chemical formula 6] In the above chemical formula 6, m1 is 1 or 2, X 11 is and X 21 are each independently -O- or -C(R 311 )(R 321 ) - but, the above X 11 and X 21 At least one of them is -O-, R 311 , R 321 , R 331 , R 341 , R 351 and R 361 are each independently hydrogen, an alkyl group having 1 to 6 carbon atoms, -C(=O)-R 41 or -R 51 -OC(=O)-R 61 And, Above R 41 and R 61 are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, Above R 51 is a substituted or unsubstituted alkylene group having 1 to 6 carbon atoms, Above L 11 , L 21 , R 41 , R 51 and R 61 The substituents of are each independently at least one selected from the group consisting of deuterium, -F, -Cl, -Br, -I, -CN, -NO2 and -SO3, * is R as a binding site 311 , R 321 , R 331 , R 341 , R 351 , and R 361 Located in one of the L 11 and L 21 If all are direct bonds, R 11 and R 21 is not CS1-7 at the same time, L 11 and L 21 When all are methylene groups and n is 2, R 11 and R 21 is not CS1-2 at the same time.

11. In claim 10, A non-aqueous electrolyte in which the substituent represented by the chemical formula 6 is selected from the group consisting of CS1-1 to CS1-15 below: .

12. In claim 11, The compound represented by the above chemical formula 5 is a non-aqueous electrolyte comprising at least one compound selected from the group consisting of compounds A to Q below: .

13. In claim 1, A non-aqueous electrolyte in which the compound represented by the above chemical formula 1 is contained in an amount of 0.01 wt% to 10 wt% based on the total weight of the non-aqueous electrolyte.

14. In claim 1, The above lithium salts are LiCl, LiBr, LiI, LiBF4, LiClO4, LiAlO4, LiAlCl4, LiPF6, LiSbF6, LiAsF6, LiB 10 Cl 10 A non-aqueous electrolyte comprising at least one selected from the group consisting of LiBOB (LiB(C2O4)2), LiCF3SO3, LiFSI (LiN(SO2F)2), LiCH3SO3, LiCF3CO2, LiCH3CO2, and LiBETI (LiN(SO2CF2CF3)2).

15. Bipolar; A cathode opposite to the above anode; A separator interposed between the positive electrode and the negative electrode; and A lithium secondary battery comprising a non-aqueous electrolyte according to claim 1.

16. In claim 15, The above positive electrode contains a positive electrode active material, The above positive electrode active material is a lithium secondary battery including a lithium transition metal oxide represented by the following chemical formula P-1: [Chemical formula P-1] Li 1+x [Ni a Co b Mr c M 1 d ]O 2+w In the above chemical formula P-1, 0≤x≤0.5, a+b+c+d = 1, 0.5≤a≤0.7, 0≤b≤0.15, c=1-abd, 0≤d≤0.1, 0≤b / a≤0.2, 1≤a / c≤3, 0≤w≤1, M 1 is at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo.

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