Non-aqueous electrolyte and lithium secondary battery comprising same

Abstract

The present invention relates to a non-aqueous electrolyte comprising a lithium salt, an organic solvent, and an additive, wherein the additive comprises a compound represented by chemical formula 1 below. [Chemical formula 1] In chemical formula 1: R1 is an allyl group or a propargyl group; R2, R3, R4, and R5 are each independently selected from hydrogen and a C1-C5 alkyl group; L is selected from a single bond and a C1-C10 alkylene group; and X is selected from -C(=O)-, -S(=O)-, and -S(=O)2-.

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. As personal IT devices and computer networks have developed due to the development of the information society, and as a result, the overall dependence of society on electric energy has increased, there is a demand for technology development to efficiently store and utilize electric energy. Among the developed technologies, secondary batteries are the most suitable for various applications, and among these secondary batteries, lithium secondary batteries are attracting attention as they can be miniaturized to the point where they can be applied to personal IT devices and have the highest energy density. Typically, lithium secondary batteries are manufactured by injecting or impregnating a non-aqueous electrolyte into an electrode assembly consisting of a cathode, an anode, and a porous separator. The positive active materials of these lithium secondary batteries include lithium-containing cobalt oxide and LiMnO with a layered crystal structure. 2 , LiMn with spinel crystal structure 2 O 4 , lithium-containing nickel oxide (LiNiO 2 ) The use of lithium nickel-cobalt-manganese transition metal oxides, etc. is being considered. Meanwhile, the use of carbon-based active materials and silicon-based active materials is being considered as negative active materials. In particular, lithium secondary batteries for automotive use are becoming increasingly important for high capacity, high output, and long lifespan characteristics. In order to increase the capacity of lithium secondary batteries, it may be considered to use a nickel-rich cathode active material with high energy density but low stability, or to operate lithium secondary batteries at high voltage. However, when a lithium secondary battery is operated under the above conditions, as charge and discharge progresses, the film formed on the surface of the positive / negative electrode or the electrode surface structure may deteriorate due to a side reaction caused by deterioration of the electrolyte, and transition metal ions may be eluted from the surface of the positive electrode. In this way, the eluted transition metal ions are electro-deposited on the negative electrode and reduce the passivation ability of the SEI (Solid electrolyte interface) film of the negative electrode, which causes the problem of deterioration of the negative electrode. This deterioration phenomenon of the secondary battery tends to be further accelerated when the potential of the positive electrode increases or the battery is exposed to high temperatures. In addition, when a lithium secondary battery is used continuously for a long period of time or is left at a high temperature, gas is generated, causing the thickness of the battery to increase, which is called swelling. It is known that the amount of gas generated at this time is determined by the state of the SEI. Therefore, in order to solve these problems, research and development are being attempted on methods to suppress the dissolution of metal ions from the positive electrode and form a stable SEI film on the negative electrode, thereby reducing the swelling phenomenon of lithium secondary batteries and increasing stability at high temperatures. One object of the present invention is to provide a non-aqueous electrolyte capable of forming a highly durable SEI film on a cathode. In addition, another object of the present invention is to provide a lithium secondary battery having improved high-temperature cycle characteristics and high-temperature storage performance, including the non-aqueous electrolyte described above, thereby improving overall performance. [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, R 1 is an allyl or propargyl group, and R2 , R 3 , R 4 and R 5 are independently selected from hydrogen and an alkyl group having 1 to 5 carbon atoms, L is selected from a single bond and an alkylene group having 1 to 10 carbon atoms, and X is -C(=O)-, -S(=O)-, and -S(=O) 2 - is selected from. [2] The present invention, in the above [1], the R 1 provides a non-aqueous electrolyte, which is an allylic acid. [3] The present invention provides a non-aqueous electrolyte in the above [1] or [2], wherein X is selected from -C(=O)- and -S(=O)-. [4] The present invention relates to at least one of the above [1] to [3], wherein R 2 , R 3 , R 4 and R 5 provides a non-aqueous electrolyte which is an alkyl group having 1 to 5 carbon atoms independently of each other. [5] The present invention provides a non-aqueous electrolyte comprising at least one compound represented by the chemical formula 1 in at least one of the above [1] to [4], selected from the group consisting of compounds represented by the following chemical formulas 1-A, 1-B, 1-C, 2-A, 2-B and 2-C. [Chemical Formula 1-A] [Chemical Formula 1-B] [Chemical Formula 1-C] [Chemical Formula 2-A] [Chemical Formula 2-B] [Chemical Formula 2-C] In the above chemical formulas 1-A, 1-B, 1-C, 2-A, 2-B and 2-C, R 2 , R 3 , R 4 and R 5 is as defined in the chemical formula 1 above. [6] The present invention provides a non-aqueous electrolyte, wherein in at least one of the above [1] to [5], the compound represented by the chemical formula 1 comprises at least one selected from the group consisting of compounds represented by the following chemical formulas 1-A-1, 1-A-2, 1-B-1, 1-B-2, 1-C-1, 1-C-2, 2-A-1, 2-A-2, 2-B-1, 2-B-2, 2-C-1, and 2-C-2. [Chemical Formula 1-A-1] [Chemical Formula 1-A-2] [Chemical Formula 1-B-1] [Chemical Formula 1-B-2] [Chemical formula 1-C-1] [Chemical formula 1-C-2] [Chemical Formula 2-A-1] [Chemical Formula 2-A-2] [Chemical Formula 2-B-1] [Chemical Formula 2-B-2] [Chemical formula 2-C-1] [Chemical formula 2-C-2] [7] The present invention provides a non-aqueous electrolyte, wherein the compound represented by the chemical formula 1 is contained in an amount of 0.01 wt% to 10 wt% based on the weight of the non-aqueous electrolyte, in at least one of the above [1] to [6]. [8] The present invention relates to at least one of the above [1] to [7], wherein the lithium salt is LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiPF 6 , LiSbF 6 , LiAsF 6 , LiB 10 Cl 10 , LiBOB(LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiFSI(LiN(SO 2 F) 2 ), LiCH 3 SO 3 , LiCF 3 CO 2 , LiCH 3 CO 2 and LiBETI(LiN(SO 2 CF 2 CF 3 ) 2 ) is provided. A non-aqueous electrolyte comprising at least one selected from the group consisting of: [9] The present invention provides a non-aqueous electrolyte, wherein in at least one of the above [1] to [8], the lithium salt is included in the non-aqueous electrolyte at a molar concentration of 0.5 M to 5.0 M.

[0010] The present invention provides a non-aqueous electrolyte, wherein in at least one of the above [1] to [9], the organic solvent includes 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.

[0011] The present invention provides a lithium secondary battery including: a positive electrode; a negative electrode opposing the positive electrode; a separator interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte according to at least one of [1] to

[0010] . The non-aqueous electrolyte of the present invention is characterized by using a cyclic borate compound containing an allyl group or a propargyl group in its structure as an additive. The cyclic borate compound according to the present invention can form a SEI film having a high density and high durability while promoting lithium migration characteristics during reduction at an anode. At this time, the allyl group or propargyl group included in the cyclic borate compound can facilitate the access of the cyclic borate compound to the anode during reduction at the anode and improve reactivity, thereby further facilitating the formation of the SEI film derived from the cyclic borate compound described above. Accordingly, a lithium secondary battery including the non-aqueous electrolyte according to the present invention can have improved life performance and storage performance, particularly, improved life performance and storage performance at high temperatures and high voltages. The terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as having 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 manner. It should be understood that the terms “comprise,” “include,” or “have,” as used herein, 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. Meanwhile, before explaining the present invention, unless otherwise specifically stated, "*" in the present invention means a connected portion (bonding site) between terminals of identical or different atoms or chemical formulas. In addition, in the description of "carbon atoms a to b" in the present 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. For example, "an alkyl group having 1 to 5 carbon atoms" means an alkyl group including 1 to 5 carbon atoms, i.e., CH 3 -, CH 3 CH 2 -, CH 3 CH 2 CH 2 -, (CH 3 ) 2 CH-, CH 3 CH 2 CH 2 CH 2 -, (CH 3 ) 2 CHCH 2 -, CH 3 CH 2 CH 2 CH 2 CH 2 -, (CH 3 ) 2 CHCH 2 CH 2 - means back. Additionally, in the present specification, both the alkyl group and the aryl group may be substituted or unsubstituted. The above "substitution" means, unless otherwise defined, that at least one hydrogen bonded to carbon is replaced with an element other than hydrogen, for example, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 12 carbon atoms, a cycloalkenyl group having 3 to 12 carbon atoms, a cycloalkynyl group having 3 to 12 carbon atoms, a heterocycloalkyl group having 3 to 12 carbon atoms, a heterocycloalkenyl group having 3 to 12 carbon atoms, a heterocycloalkynyl group having 2 to 12 carbon atoms, an aryloxy group having 6 to 12 carbon atoms, a halogen atom, a fluoroalkyl group having 1 to 20 carbon atoms, a nitro group, an aryl group having 6 to 20 carbon atoms, a halogen atom, an aryl group having 2 to 20 carbon atoms, a cycloalkyl ... It means substituted with a heteroaryl group having 20 carbon atoms, a haloaryl group having 6 to 20 carbon atoms, etc. Hereinafter, the present invention will be described in more detail. The non-aqueous electrolyte and / or lithium secondary battery according to the present invention comprises at least one of the configurations disclosed below, and may comprise any combination between technically possible configurations among the configurations below. Electrolyte of the dagger The present invention relates to a non-aqueous electrolyte. Specifically, the non-aqueous electrolyte according to the present invention comprises 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, R 1 is an allyl or propargyl group, and R 2 , R 3 , R 4 and R 5are independently selected from hydrogen and an alkyl group having 1 to 5 carbon atoms, L is selected from a single bond and an alkylene group having 1 to 10 carbon atoms, and X is -C(=O)-, -S(=O)-, and -S(=O) 2 - is selected from. (1) Lithium salt As the lithium salt used in the present invention, various lithium salts commonly used in non-aqueous electrolytes for lithium secondary batteries can be used without limitation. For example, the lithium salt may be Li as a cation. + , and the anion is F - , Cl - , Br - , I - , NO 3 - , N(CN) 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - , SbF 6 - , AsF 6 - , B 10 Cl 10 - , 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 PF3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , (FSO 2 ) 2 N - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH - , CH 3 SO 3 - , CF 3 (CF 2 ) 7 SO 3 - , CF 3 CO 2 - , CH 3 CO 2 - , SCN - And (CF 3 CF 2 SO 2 ) 2 N - It may include at least one selected from the group consisting of: Specifically, the lithium salts are LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiPF6 , LiSbF 6 , LiAsF 6 , LiB 10 Cl 10 , LiBOB (LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiFSI (LiN(SO 2 F) 2 ), LiCH 3 SO 3 , LiCF 3 CO 2 , LiCH 3 CO 2 and LiBETI (LiN(SO 2 CF 2 CF 3 ) 2 ) may include at least one selected from the group consisting of LiBF. Specifically, the lithium salt is LiBF 4 , LiClO 4 , LiPF 6 , LiBOB (LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiTFSI (LiN(SO 2 CF 3 ) 2 ), LiFSI ((LiN(SO 2 F) 2 ) and LiBETI (LiN(SO 2 CF 2 CF 3 ) 2 ) may include at least one selected from the group consisting of: The lithium salt may be included in the non-aqueous electrolyte at a concentration of 0.5 M to 5 M, specifically at a concentration of 0.8 M to 4 M, and more specifically at a concentration of 0.8 M to 2.0 M. When the concentration of the lithium salt satisfies the above range, the lithium ion yield (Li +The transference number and the degree of dissociation of lithium ions can be improved, thereby improving the output characteristics of the 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 25:75. 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 non-aqueous electrolyte contains an additive. The above additive comprises a compound represented by the following chemical formula 1. [Chemical Formula 1] In the above chemical formula 1, R 1 is an allyl or propargyl group, and R 2 , R 3 , R 4 and R 5 are independently selected from hydrogen and an alkyl group having 1 to 5 carbon atoms, L is selected from a single bond and an alkylene group having 1 to 10 carbon atoms, and X is -C(=O)-, -S(=O)-, and -S(=O) 2 - is selected from. The compound represented by the above chemical formula 1 can be reduced at the negative electrode to form an SEI film on the negative electrode that has excellent lithium mobility characteristics, a high density, and high durability. In general, in the case of cyclic borates, they are substances that can be reduced at the cathode to form an SEI film, but after being solvated with an organic solvent, they are too bulky to approach the cathode, and this reduced accessibility becomes a factor that makes the reaction difficult during cathode reduction. In this regard, the compound represented by the chemical formula 1 according to the present invention has an allylic group (-CH) in its structure. 2 -CH=CH 2 ) or propargyl group (-CH 2 -C≡CH) is bonded to a cyclic borate. Since the allyl group or propargyl group has high reactivity due to LUMO characteristics and easily approaches the cathode, the cyclic borate bonded to the allyl group or propargyl group also easily approaches the cathode, and thus the reactivity of the cyclic borate at the cathode can be promoted. This effect cannot be realized from a substituent (such as an alkyl group) other than an allyl group and a propargyl group. In the chemical formula 1 above, R 1It can be an allyl group or a propargyl group, and more specifically, it can be an allyl group. In the above chemical formula 1, R 2 , R 3 , R 4 and R 5 may be independently selected from hydrogen and an alkyl group having 1 to 5 carbon atoms, specifically, may be independently selected from an alkyl group having 1 to 5 carbon atoms, more specifically, may be independently selected from an alkyl group having 1 to 3 carbon atoms, and even more specifically, may be independently selected from a methyl group and an ethyl group, and even more specifically, may be a methyl group. In the above-mentioned types, R 2 , R 3 , R 4 and R 5 It is possible to realize a SEI film-forming effect with excellent stability and durability without inhibiting the effect according to the combination of a cyclic borate; and an allyl or propargyl group. In the above chemical formula 1, L can be selected from a single bond and an alkylene group having 1 to 10 carbon atoms, and within the above range, the effects of improving the cathode accessibility and reactivity of the cyclic borate according to a vinyl group or a propargyl group can be easily implemented. In the above chemical formula 1, L can be specifically selected from a single bond and an alkylene group having 1 to 3 carbon atoms, and more specifically, can be a single bond. In the above chemical formula 1, X is -C(=O)-, -S(=O)-, and -S(=O) 2 - is selected from. The X is a cyclic borate; and an alkyl group or a propargyl group; and can contribute to improving lithium mobility, durability, and oxidation resistance of the SEI film when forming the SEI film. In the chemical formula 1, X can be specifically selected from -C(=O)- and -S(=O)-. Specifically, the compound represented by the chemical formula 1 may include at least one compound selected from the group consisting of compounds represented by the following chemical formulas 1-A, 1-B, 1-C, 2-A, 2-B, and 2-C. More specifically, the compound represented by the chemical formula 1 may include at least one compound selected from the group consisting of compounds represented by the following chemical formulas 1-A, 1-B, and 1-C. Even more specifically, the compound represented by the chemical formula 1 may include at least one compound selected from the group consisting of compounds represented by the following chemical formulas 1-A and 1-B. [Chemical Formula 1-A] [Chemical Formula 1-B] [Chemical Formula 1-C] [Chemical Formula 2-A] [Chemical Formula 2-B] [Chemical Formula 2-C] In the above chemical formulas 1-A, 1-B, 1-C, 2-A, 2-B and 2-C, R 2 , R 3 , R 4 and R 5 is as defined in the chemical formula 1 above. The compound represented by the chemical formula 1 may include at least one selected from the group consisting of compounds represented by the following chemical formulas 1-A-1, 1-A-2, 1-B-1, 1-B-2, 1-C-1, 1-C-2, 2-A-1, 2-A-2, 2-B-1, 2-B-2, 2-C-1 and 2-C-2, and specifically may include at least one selected from the group consisting of compounds represented by the following chemical formulas 1-A-1, 1-A-2, 1-B-1, 1-B-2, 1-C-1 and 1-C-2, and more specifically may include at least one selected from the group consisting of compounds represented by the following chemical formulas 1-A-1, 1-A-2, 1-B-1 and 1-B-2, and even more specifically may include at least one selected from the group consisting of compounds represented by the following chemical formulas It may include at least one selected from the group consisting of compounds represented by Formula 1-A-1 and Formula 1-A-2. [Chemical Formula 1-A-1] [Chemical Formula 1-A-2] [Chemical Formula 1-B-1] [Chemical Formula 1-B-2] [Chemical formula 1-C-1] [Chemical formula 1-C-2] [Chemical Formula 2-A-1] [Chemical Formula 2-A-2] [Chemical Formula 2-B-1] [Chemical Formula 2-B-2] [Chemical formula 2-C-1] [Chemical formula 2-C-2] The compound represented by the above chemical formula 1 may be included in an amount of 0.01 wt% to 10 wt%, specifically 0.05 wt% to 5 wt%, and more specifically 2 wt% to 4 wt%, based on the weight of the non-aqueous electrolyte. When the compound represented by the above chemical formula 1 is used in the above-described content range, a flexible and durable SEI film can be formed on the negative electrode, while preventing an increase in resistance when added in excessive amounts. 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, LiBOB (lithium bis-(oxalato)borate), lithium difluorophosphate (LiDFP), TMSPa (tris(trimethylsilyl) phosphate), and TMSPi (tris(trimethylsilyl) phosphite), and specifically, lithium It may contain 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 3 wt%. When the non-aqueous electrolyte further includes the additional additive, the weight ratio of the compound represented by the chemical formula 1 and the additional additive may be 45:55 to 99:1, specifically 50:50 to 95:5, and more specifically 70:30 to 85:15, and when within the above range, the life performance and high-temperature storage performance may be improved to a more desirable level. Lithium secondary battery In addition, the present invention provides a lithium secondary battery including the above-described non-aqueous electrolyte. Specifically, a lithium secondary battery according to the present invention includes a positive electrode; an anode opposite to 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. Since the description of the non-aqueous electrolyte has been provided above, the cathode, anode, and separator will be described below. (1) Bipolar 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. The above positive electrode collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. Specifically, the positive electrode 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 negative 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 positive electrode active material layer is disposed on at least one surface of the positive electrode current collector. Specifically, the positive electrode active material layer may be disposed on one surface or both surfaces of the positive electrode current collector. The above positive electrode active material layer 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 oxide may be a lithium-manganese oxide (e.g., LiMnO). 2 , LiMn 2 O 4 etc.), lithium-cobalt oxides (e.g., LiCoO 2 etc.), lithium-nickel oxides (e.g., LiNiO 2 etc.), lithium-nickel-manganese oxides (e.g., LiNi 1-Y Mn Y O 2 (Here, 0 <Y<1), LiMn 2-z Ni z O 4 (wherein, 0<Z<2) etc.), lithium-nickel-cobalt oxides (e.g., LiNi 1-Y1 Co Y1 O 2 (Here, 0 <Y1<1) 등), 리튬-망간-코발트계 산화물(예를 들면, LiCo 1-Y2 Mn Y2 O 2 (Here, 0 <Y2<1), LiMn 2-z1 Co z1 O 4 (wherein, 0<Z1<2) etc.), lithium-nickel-manganese-cobalt oxides (e.g., Li(Ni p Co q Mn r1 )O 2 (Here, 0<p<1, 0<q<1, 0<r1<1, p+q+r1=1) or Li(Ni p1 Co q1 Mn r2 )O 4(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 )O 2 (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 among these may be included. Among these, the lithium transition metal composite oxide is LiCoO in that it can increase the capacity characteristics and stability of the battery. 2 , LiMnO 2 , LiNiO 2 , lithium nickel-manganese-cobalt oxide (e.g., Li(Ni 0.6 Mn 0.2 Co 0.2 )O 2 , Li(Ni 0.5 Mn 0.3 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 or Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 etc.), or lithium nickel cobalt aluminum oxide (e.g., Li(Ni 0.8 Co 0.15 Al 0.05 )O 2 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 )O 2, Li(Ni 0.5 Mn 0.3 Co 0.2 )O 2 , Li(Ni 0.7 Mn 0.15 Co 0.15 )O 2 or Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 These may be any one of these or a mixture of two or more of these may be used. More specifically, the cathode active material may be a lithium-transition metal composite oxide, and may contain nickel in an amount of 60 mol% or more based on the total mole number of transition metals included in the lithium-transition metal composite oxide. Specifically, the cathode active material may be a lithium-transition metal composite oxide, wherein the transition metal includes nickel; and at least one selected from manganese, cobalt, and aluminum, and may contain nickel in an amount of 60 mol% or more, specifically 60 to 90 mol%, based on the total mole number of transition metals. When such a lithium-transition metal composite oxide using a high nickel content is used together with the above-described non-aqueous electrolyte, it is preferable in that it can reduce by-products in a gas phase generated by structural collapse. In addition, the positive electrode active material may include a lithium composite transition metal oxide represented by the following chemical formula A. [Chemical Formula A] Li 1+x (Ni a Co b Mn c M d )O 2 In the chemical formula A, M 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, and 1+x, a, b, c and d are atomic fractions of independent elements, respectively, 0≤x≤0.2, 0.50≤a<1, 0 <b≤0.25, 0<c≤0.25, 0≤d≤0.1, a+b+c+d=1이다. Preferably, a, b, c and d may be 0.70≤a≤0.95, 0.025≤b≤0.20, 0.025≤c≤0.20, 0≤d≤0.05, respectively. Additionally, a, b, c, and d may be 0.80≤a≤0.95, 0.025≤b≤0.15, 0.025≤c≤0.15, and 0≤d≤0.05, respectively. Additionally, a, b, c, and d may be 0.85≤a≤0.90, 0.05≤b≤0.10, 0.05≤c≤0.10, and 0≤d≤0.03, respectively. 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. The above-described positive electrode active material layer may further include a binder and / or a conductive material together with the above-described 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 black 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 110 ㎛. 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 is opposite to the above anode. 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. 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 negative electrode active material layer is disposed on at least one surface of the negative electrode current collector. Specifically, the negative electrode active material layer may be disposed on one surface or both surfaces of the negative electrode current collector. The above negative active material layer may include a negative active material. The above negative active material is a material capable of reversibly inserting / de-inserting lithium ions, and may include at least one selected from the group consisting of a carbon-based active material, a silicon-based active material, and lithium metal, and specifically, may include at least one selected from among a carbon-based active material and a silicon-based active material, and more specifically, may include a silicon-based active material. The above carbon-based active material may include at least one selected from the group consisting of artificial graphite, natural graphite, hard carbon, soft carbon, carbon black, graphene, and fibrous carbon, and preferably may include at least one selected from the group consisting 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. The above silicon-based active material is SiO x It may include at least one selected from compounds represented by (0≤x<2) and silicon-carbon composites. SiO 2 Since the silicon-based active material 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. When the above silicon-based active material is used as an anode active material, a flexible and durable SEI layer can be formed on the surface of the anode by the non-aqueous electrolyte described above, thereby preventing damage to the SEI layer due to volume expansion of the silicon-based active material, and preventing an increase in the thickness of the SEI layer and consumption of the electrolyte due to exposure of a new silicon-based active material surface due to volume expansion, which is very desirable. 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 charge and discharge. 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%. 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 100 µm, preferably 50 µm to 80 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 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 30:70 was used as an organic solvent. LiPF as lithium salt in the above organic solvent 6 , a non-aqueous electrolyte was prepared by adding a compound represented by the following chemical formula 1-A-1 as an additive. The above LiPF 6 was included in the nonaqueous electrolyte at a molar concentration of 1 M. The compound represented by the following chemical formula 1-A-1 was included in the non-aqueous electrolyte at 3 wt%. [Chemical Formula 1-A-1] (Lithium secondary battery manufacturing) Cathode active material (Li[Ni 0.85 Co 0.05 Mn 0.07 Al 0.03 ]O 2 ) : A cathode mixture slurry (solid content 75.5 wt%) was prepared by adding a conductive agent (carbon nanotube): binder (polyvinylidene fluoride) to a solvent, N-methyl-2-pyrrolidone (NMP), in a weight ratio of 97.74:0.70:1.56. The cathode mixture slurry was applied to one surface of a cathode current collector (Al thin film) having a thickness of 12 ㎛, and drying and roll pressing were performed to prepare a cathode. A negative electrode mixture slurry (solid content 26 wt%) was prepared by adding negative active material (natural graphite): conductive material (carbon black): binder (styrene-butadiene rubber (SBR)-carboxymethyl cellulose (CMC)) in a weight ratio of 96.15:1.55:2.30 to distilled water as a solvent. The negative electrode mixture slurry was applied to one surface of a 15 μm thick negative electrode current collector (Cu thin film), and dried and roll pressed to form a negative electrode active material layer (thickness: 179.8 μm), thereby preparing 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 represented by the chemical formula 1-A-1 was added to the non-aqueous electrolyte in an amount of 0.05 wt% instead of 3 wt%. 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 represented by the chemical formula 1-A-1 was added to the non-aqueous electrolyte in an amount of 5 wt% instead of 3 wt%. Example 4 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that a compound represented by the following chemical formula 1-B-1 was added to the non-aqueous electrolyte in an amount of 3 wt% instead of 3 wt% of the compound represented by the above chemical formula 1-A-1. [Chemical Formula 1-B-1] Example 5 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 4, except that the compound represented by the chemical formula 1-B-1 was added to the non-aqueous electrolyte in an amount of 0.05 wt% instead of 3 wt%. Example 6 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 4, except that the compound represented by the chemical formula 1-B-1 was added to the non-aqueous electrolyte in an amount of 5 wt% instead of 3 wt%. 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 1-A-1 was not added. Comparative Example 2 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that a compound represented by the following chemical formula 3 was added to the non-aqueous electrolyte in an amount of 3 wt% instead of 3 wt% of the compound represented by the above chemical formula 1-A-1. [Chemical Formula 3] Comparative Example 3 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that a compound represented by the following chemical formula 4 was added to the non-aqueous electrolyte in an amount of 3 wt% instead of 3 wt% of the compound represented by the above chemical formula 1-A-1. [Chemical Formula 4] Comparative Example 4 A non-aqueous electrolyte and a lithium secondary battery were manufactured in the same manner as in Example 1, except that a compound represented by the following chemical formula 5 was added to the non-aqueous electrolyte in an amount of 3 wt% instead of 3 wt% of the compound represented by the above chemical formula 1-A-1. [Chemical Formula 5] Experimental example Experimental Example 1: Evaluation of High Temperature Cycle Performance The lithium secondary batteries manufactured in Examples 1 to 6 and Comparative Examples 1 to 4 above were charged to 4.2 V, 0.05 C using an electrochemical charger / discharger under CC / CV, 1 C conditions at 45°C, and then discharged to 3.0 V under CC, 0.5 C conditions, which constituted one cycle, and 200 charge / discharge cycles were performed. 1-1: Capacity maintenance rate evaluation 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)} × 100 1-2: Resistance Increase Rate Evaluation 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 3 below. Resistance Increase Rate (%) = (Resistance after 200 cycles - Initial resistance) / Initial resistance × 100 Experimental Example 2: Evaluation of High Temperature Storage Performance The lithium secondary batteries manufactured in Examples 1 to 6 and Comparative Examples 1 to 4 above were charged to 4.2 V, 0.05 C under CC / CV, 0.33 C conditions at 25°C and discharged to 2.5 V at 0.33 C to perform initial charge / discharge. After that, they were charged to 4.2 V, 0.05 C under CC / CV, 0.33 C conditions at 25°C and then stored at 60°C for 8 weeks. 2-1: Capacity maintenance rate evaluation After 8 weeks of storage, the lithium secondary battery was charged to 4.2 V, 0.05 C at 25°C under 0.33 C conditions and discharged to 3.0 V at 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 1 below. Capacity retention rate (%) = (discharge capacity after 8 weeks of storage / initial discharge capacity) × 100 2-2: Resistance Increase Rate Evaluation During the initial charge and discharge, after checking the capacity at room temperature, the battery was charged to SOC 50 based on the discharge capacity, discharged for 10 seconds with a 3C current, and the resistance was measured by 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 1 below. Resistance Increase Rate (%) = (Final Resistance - Initial Resistance) / (Initial Resistance) × 100 Experimental Example 1 Experimental Example 2 Capacity Maintenance Rate (%) Resistance Increase Rate (%) Capacity Maintenance Rate (%) Resistance Increase Rate (%) Example 1,926,955 Example 2,928,957 Example 3,906,948 Example 4,937,966 Example 5,928,968 Example 6,917,957 Comparative Example 1,763,47238 Comparative Example 2,773,37535 Comparative Example 3,773,37436 Comparative Example 4,694,27040 Referring to Table 1 above, it can be confirmed that the lithium secondary batteries of Examples 1 to 6 using the non-aqueous electrolyte according to the present invention exhibit remarkably superior capacity retention rates and low resistance increase rates during high-temperature cycle charge / discharge and high-temperature storage compared to Comparative Examples 1 to 3 that do not.

Claims

1. Containing lithium salt, organic solvent and 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, R 1 is an allyl or propargyl group, R 2 , R 3 , R 4 and R 5 are independently selected from hydrogen and alkyl groups having 1 to 5 carbon atoms, L is selected from a single bond and an alkylene group having 1 to 10 carbon atoms, X is -C(=O)-, -S(=O)-, and -S(=O) 2 - is selected from.

2. In claim 1, Above R 1 Silver is an allyl group, non-aqueous electrolyte.

3. In claim 1, The above X is a non-aqueous electrolyte selected from -C(=O)- and -S(=O)-.

4. In claim 1, Above R 2 , R 3 , R 4 and R 5 A non-aqueous electrolyte which is an alkyl group having 1 to 5 carbon atoms independently of each other.

5. In claim 1, The compound represented by the above chemical formula 1 is a non-aqueous electrolyte comprising at least one selected from the group consisting of compounds represented by the following chemical formulas 1-A, 1-B, 1-C, 2-A, 2-B and 2-C: [Chemical Formula 1-A] [Chemical Formula 1-B] [Chemical Formula 1-C] [Chemical Formula 2-A] [Chemical Formula 2-B] [Chemical Formula 2-C] In the above chemical formulas 1-A, 1-B, 1-C, 2-A, 2-B and 2-C, R 2 , R 3 , R 4 and R 5 is as defined in the chemical formula 1 above.

6. In claim 1, The compound represented by the above chemical formula 1 is a non-aqueous electrolyte including at least one selected from the group consisting of compounds represented by the following chemical formulas 1-A-1, 1-A-2, 1-B-1, 1-B-2, 1-C-1, 1-C-2, 2-A-1, 2-A-2, 2-B-1, 2-B-2, 2-C-1, and 2-C-2: [Chemical Formula 1-A-1] [Chemical Formula 1-A-2] [Chemical Formula 1-B-1] [Chemical Formula 1-B-2] [Chemical formula 1-C-1] [Chemical formula 1-C-2] [Chemical Formula 2-A-1] [Chemical Formula 2-A-2] [Chemical Formula 2-B-1] [Chemical Formula 2-B-2] [Chemical formula 2-C-1] [Chemical formula 2-C-2] .

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

8. In claim 1, The above lithium salts are LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiAlO 4 , LiAlCl 4 , LiPF 6 , LiSbF 6 , LiAsF 6 , LiB 10 Cl 10 , LiBOB(LiB(C 2 O 4 ) 2 ), LiCF 3 SO 3 , LiFSI(LiN(SO 2 F) 2 ), LiCH 3 SO 3 , LiCF 3 CO 2 , LiCH 3 CO 2 and LiBETI(LiN(SO 2 CF 2 CF 3 ) 2 ) A non-aqueous electrolyte comprising at least one member selected from the group consisting of:

9. In claim 1, A non-aqueous electrolyte, wherein the lithium salt is contained in the non-aqueous electrolyte at a molar concentration of 0.5 M to 5.0 M.

10. In claim 1, A non-aqueous electrolyte wherein the organic solvent comprises 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.

11. 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.

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