Lithium secondary battery

Abstract

The present invention provides a lithium secondary battery comprising: a cathode; an anode; a separator interposed between the cathode and the anode; and a non-aqueous electrolyte, wherein the cathode includes a cathode active material and a first additive, the non-aqueous electrolyte includes a lithium salt, an organic solvent, and a second additive, the first additive includes at least one selected from the group consisting of compounds represented by chemical formula 1-1 and chemical formula 1-2, and the second additive includes a cyclic sulfur oxide-based compound. Chemical Formula 1-1 and Chemical Formula 1-2 are as described in the specification.

Description

Lithium secondary battery The present invention relates to a lithium secondary battery. 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, high operating voltage is required to achieve high energy density of lithium secondary batteries. However, when operating at such high voltage, problems such as electrolyte depletion due to oxidative decomposition reaction of electrolyte, gas generation, and transition metal elution of positive electrode active material occur, resulting in problems such as reduced battery life performance, storage performance, and durability. One object of the present invention is to solve the above-described problems by forming a highly durable film on the surface of a positive electrode, thereby providing a lithium secondary battery having high temperature durability, long-term life performance, and high voltage stability. [1] The present invention provides a lithium secondary battery comprising: a cathode; an anode; a separator interposed between the cathode and the anode; and a non-aqueous electrolyte; wherein the cathode comprises a cathode active material and a first additive, and the non-aqueous electrolyte comprises a lithium salt, an organic solvent, and a second additive, wherein the first additive comprises at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1 and 1-2, and the second additive comprises a cyclic sulfur oxide-based compound. [Chemical Formula 1-1] In the above chemical formula 1-1, Y 11 is nitrogen (N) or R Y11 is a substituted carbon (C), and Y 12 is oxygen (O), sulfur (S), R Y121 Nitrogen (N) or R substituted Y122 and R Y123 is a substituted carbon (C), and Y 13 is nitrogen (N) or R Y13 is a substituted carbon (C), and Y 14 is nitrogen (N) or R Y14 is a substituted carbon (C), and Y 15 is nitrogen (N) or R Y15 is a substituted carbon (C), and at this time, Y 11 and Y 15 At least one of them is nitrogen (N), and Y 11 , Y 12 , Y 13 , Y 14 , and Y 15 At least one of them is carbon (C), and R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y11 , R Y121 , RY122 , R Y123 , R Y13 , R Y14 and R Y15 At least one of them is a substituent represented by the chemical formula 1-a. [Chemical Formula 1-2] In the above chemical formula 1-2, Y 21 is nitrogen (N) or R Y21 is a substituted carbon (C), and Y 22 is nitrogen (N) or R Y22 is a substituted carbon (C), and Y 23 is nitrogen (N) or R Y23 is a substituted carbon (C), and Y 24 is nitrogen (N) or R Y24 is a substituted carbon (C), and Y 25 is nitrogen (N) or R Y25 is a substituted carbon (C), and at this time, Y 21 , Y 22 , Y 23 , Y 24 and Y 25 At least one of them is carbon (C), and R Y21 , R Y22 , R Y23 , R Y24 and R Y25 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y21 , R Y22 , R Y23 , R Y24 and R Y25 At least one of them is a substituent represented by the chemical formula 1-a. [Chemical formula 1-a] In the above chemical formula 1-a, L1 is selected from a direct bond, an ester, an ether, and an alkylene group having 1 to 5 carbon atoms, R1 is a direct bond or an alkylene group having 1 to 5 carbon atoms, and R2 is *-CH=CH2 or *-C≡CH, wherein * is a bonding site. [2] The present invention provides a lithium secondary battery, wherein, in the above [1], the compound represented by the chemical formula 1-1 comprises at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1-A, 1-1-B, 1-1-C, 1-1-D, 1-1-E and 1-1-F. [Chemical Formula 1-1-A] [Chemical Formula 1-1-B] [Chemical Formula 1-1-C] [Chemical Formula 1-1-D] [Chemical Formula 1-1-E] [Chemical Formula 1-1-F] . In the above chemical formulas 1-1-A, 1-1-B, 1-1-C, 1-1-D, 1-1-E and 1-1-F, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 is as defined in chemical formula 1-1. [3] The present invention provides a lithium secondary battery, wherein in one or more of the above [1] to [2], the compound represented by the chemical formula 1-2 includes at least one selected from the group consisting of compounds represented by the following chemical formulas 1-2-A, 1-2-B, 1-2-C, 1-2-D, and 1-2-E. [Chemical Formula 1-2-A] [Chemical Formula 1-2-B] [Chemical Formula 1-2-C] [Chemical Formula 1-2-D] [Chemical Formula 1-2-E] . In the above chemical formulas 1-2-A, 1-2-B, 1-2-C, 1-2-D and 1-2-E, R Y21 , R Y22 , R Y23 , R Y24 and R Y25 is as defined in chemical formula 1-2. [4] The present invention provides a lithium secondary battery, wherein in at least one of the above [1] to [3], the first additive includes a compound represented by the chemical formula 1-1. [5] The present invention provides a lithium secondary battery, wherein in one or more of the above [1] to [4], the compound represented by the chemical formula 1-1 includes at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1-A1 to 1-1-A4. [Chemical Formula 1-1-A1] [Chemical Formula 1-1-A2] [Chemical Formula 1-1-A3] [Chemical Formula 1-1-A4] . [6] The present invention provides a lithium secondary battery in which the first additive is included in the positive electrode in an amount of 0.004 to 8 parts by weight based on 100 parts by weight of the positive electrode active material, in at least one of [1] to [5]. [7] The present invention provides a lithium secondary battery in which the first additive is included in the positive electrode in an amount of 0.04 to 4 parts by weight based on 100 parts by weight of the positive electrode active material in at least one of [1] to [6]. [8] The present invention provides a lithium secondary battery, wherein in one or more of the above [1] to [7], the cyclic sulfur oxide compound includes at least one selected from the group consisting of compounds represented by the following chemical formulas 2-a, 2-b, 2-c, 2-d, 2-e, 2-f, and 2-g. [Chemical formula 2-a] In the above chemical formula 2-a, X 11 and X 12 are independently of each other *-O-* or *-C(R X11 )(R X12 )-* but, X 11 and X 12 is at the same time *-C(R X11 )(R X12 )-* is not, R 11 , R 14 , R X11 and R X12 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, R 12 and R 13is independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, a halogen group, or a substituent represented by the following chemical formula 3, or R 12 and R 13 A cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms formed by mutually fused rings, and R 12 and R 13 When forming an aryl group having 6 to 20 carbon atoms, R 11 and R 14 does not exist, i is an integer of 1 or 2, * is the binding site, [Chemical formula 2-b] In the above chemical formula 2-b, R 21 , R 22 , R 23 and R 24 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, [Chemical formula 2-c] In the above chemical formula 2-c, R 31 , R 32 , R 33 and R 34 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, [Chemical formula 2-d] In the above chemical formula 2-d, R 41 , R 42 , R 43 and R 46are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, R 44 and R 45 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, or R 44 and R 45 is a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms formed by mutually fused rings, and R 44 and R 45 When R forms an aryl group having 6 to 20 carbon atoms, 43 and R 46 does not exist, [Chemical formula 2-e] In the above chemical formula 2-e, X 51 and X 52 are independently of each other *-O-* or *-C(R X51 )(R X52 )-* but, X 51 and X 52 is at the same time *-C(R X51 )(R X52 )-* is not, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, j is an integer of 1 or 2, [Chemical formula 2-f] In the above chemical formula 2-f, X 71 and X72 are independently of each other *-O-* or *-C(R X71 )(R X72 )-* but, X 71 and X 72 is at the same time *-C(R X71 )(R X72 )-* is not, X 73 and X 74 are independently of each other *-O-* or *-C(R X73 )(R X74 )-* but, X 73 and X 74 is at the same time *-C(R X73 )(R X74 )-* is not, R X71 , R X72 , R X73 , R X74 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, m and n are integers 1 or 2, independently of each other, * is the binding site, [Chemical formula 2-g] In the above chemical formula 2-g, R 81 , R 82 , R 83 and R 84 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, [Chemical Formula 3] In the above chemical formula 3, L 61 and L 62 are independently a direct bond or an alkylene group having 1 to 5 carbon atoms, A is a substituent represented by the following chemical formula 4, X 61 and X 62are independently of each other *-O-* or *-C(R X61 )(R X62 )-* but, X 11 and X 12 is at the same time *-C(R X61 )(R X62 )-* is not, R 63 , R X61 and R X62 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, R 61 and R 62 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or a halogen group, or R 62 and R 63 A cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, or a cycloalkynyl group having 5 to 20 carbon atoms formed by fused rings, k is an integer of 1 or 2, * is the binding site, [Chemical Formula 4] In the above chemical formula 4, l is an integer of 1 or 2, and * is a binding site. [9] The present invention provides a lithium secondary battery, wherein in one or more of the above [1] to [8], the cyclic sulfur oxide compound comprises at least one selected from the group consisting of compounds represented by the following chemical formulae 2-a-1 to 2-a-25, chemical formula 2-b-1, chemical formula 2-c-1, chemical formula 2-d-1, chemical formula 2-e-1, chemical formula 2-e-2, chemical formula 2-f-1, and chemical formula 2-g-1. [Chemical formula 2-a-1] [Chemical formula 2-a-2] [Chemical formula 2-a-3] [Chemical formula 2-a-4] [Chemical formula 2-a-5] [Chemical formula 2-a-6] [Chemical formula 2-a-7] [Chemical formula 2-a-8] [Chemical formula 2-a-9] [Chemical formula 2-a-10] [Chemical formula 2-a-11] [Chemical formula 2-a-12] [Chemical formula 2-a-13] [Chemical Formula 2-a-14] [Chemical formula 2-a-15] [Chemical formula 2-a-16] [Chemical formula 2-a-17] [Chemical formula 2-a-18] [Chemical Formula 2-a-19] [Chemical formula 2-a-20] [Chemical Formula 2-a-21] [Chemical formula 2-a-22] [Chemical Formula 2-a-23] [Chemical Formula 2-a-24] [Chemical Formula 2-a-25] [Chemical formula 2-b-1] [Chemical formula 2-c-1] [Chemical formula 2-d-1] [Chemical formula 2-e-1] [Chemical formula 2-e-2] [Chemical formula 2-f-1] [Chemical formula 2-g-1] .

[0010] The present invention provides a lithium secondary battery, wherein in one or more of the above [1] to [9], the second additive is included in the non-aqueous electrolyte at 0.01 wt% to 10 wt%.

[0011] The present invention provides a lithium secondary battery, wherein in at least one of the above [1] to

[0010] , the positive electrode active material includes a lithium transition metal oxide of the following chemical formula A. [Chemical Formula A] Li 1+x [Ni a Co b Mn c M 1 d ]O 2+w In the above chemical formula A, 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.

[0012] The present invention provides a lithium secondary battery, wherein in one or more of the above [1] to

[0011] , the negative electrode includes a negative electrode active material, and the negative electrode active material includes at least one selected from the group consisting of a carbon-based active material and a silicon-based active material. The lithium secondary battery of the present invention is characterized by including a nitrogen-containing heteroaromatic compound of a specific chemical formula (chemical formula 1-1 and / or chemical formula 1-2) as a first additive in the positive electrode, and including a cyclic sulfur oxide-based compound as a second additive included in the non-aqueous electrolyte. According to the present invention, by including the first additive in the positive electrode, a film that improves oxidation durability is preemptively formed, and through the second additive that can be decomposed through a chemical reaction with the first additive to form an additional film, oxygen desorption of the positive electrode is suppressed and interface safety between the positive electrode and the non-aqueous electrolyte is secured, thereby enabling the implementation of a lithium secondary battery having excellent life performance, high-temperature storage performance, and resistance reduction effect. The lithium secondary battery of the present invention can exhibit even more desirable effects, particularly when operating at high voltage where problems such as electrolyte depletion, gas generation, and oxygen desorption of the positive electrode active material become severe. 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" represent 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" refers to an alkyl group including 1 to 5 carbon atoms, that is, CH3-, CH3CH2-, CH3CH2CH2-, (CH3)2CH-, CH3CH2CH2CH2-, (CH3)2CHCH2-, CH3CH2CH2CH2CH2-, (CH3)2CHCH2-, CH3CH2CH2CH2CH2-, (CH3)2CHCH2CH2-, etc. Additionally, in the present specification, any alkyl group, alkenyl group, alkynyl group, alkoxy group, aryl group or heteroaryl 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. Lithium secondary battery The present invention relates to a lithium secondary battery. A lithium secondary battery according to the present invention comprises: a cathode; an anode; a separator interposed between the cathode and the anode; and a non-aqueous electrolyte; wherein the cathode comprises a cathode active material and a first additive, the non-aqueous electrolyte comprises a lithium salt, an organic solvent, and a second additive, and the first additive comprises at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1 and 1-2, and the second additive comprises a cyclic sulfur oxide-based compound. [Chemical Formula 1-1] In the above chemical formula 1-1, Y 11 is nitrogen (N) or R Y11 is a substituted carbon (C), and Y 12is oxygen (O), sulfur (S), R Y121 Nitrogen (N) or R substituted Y122 and R Y123 is a substituted carbon (C), and Y 13 is nitrogen (N) or R Y13 is a substituted carbon (C), and Y 14 is nitrogen (N) or R Y14 is a substituted carbon (C), and Y 15 is nitrogen (N) or R Y15 is a substituted carbon (C), and at this time, Y 11 and Y 15 At least one of them is nitrogen (N), and Y 11 , Y 12 , Y 13 , Y 14 , and Y 15 At least one of them is carbon (C), and R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 At least one of them is a substituent represented by the chemical formula 1-a. [Chemical Formula 1-2] In the above chemical formula 1-2, Y 21 is nitrogen (N) or R Y21 is a substituted carbon (C), and Y 22 is nitrogen (N) or R Y22 is a substituted carbon (C), and Y 23 is nitrogen (N) or R Y23 is a substituted carbon (C), and Y 24 is nitrogen (N) or R Y24is a substituted carbon (C), and Y 25 is nitrogen (N) or R Y25 is a substituted carbon (C), and at this time, Y 21 , Y 22 , Y 23 , Y 24 and Y 25 At least one of them is carbon (C), and R Y21 , R Y22 , R Y23 , R Y24 and R Y25 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y21 , R Y22 , R Y23 , R Y24 and R Y25 At least one of them is a substituent represented by the chemical formula 1-a. [Chemical formula 1-a] In the above chemical formula 1-a, L1 is selected from a direct bond, an ester, an ether, and an alkylene group having 1 to 5 carbon atoms, R1 is a direct bond or an alkylene group having 1 to 5 carbon atoms, and R2 is *-CH=CH2 or *-C≡CH, wherein * is a bonding site. The lithium secondary battery of the present invention is characterized by including a nitrogen-containing heteroaromatic compound of a specific chemical formula (chemical formula 1-1 and / or chemical formula 1-2) as a first additive in the positive electrode, and including a cyclic sulfur oxide-based compound as a second additive included in the non-aqueous electrolyte. According to the present invention, by including the first additive in the positive electrode, a film that improves oxidation durability is preemptively formed, and through the second additive that can be decomposed through a chemical reaction with the first additive to form an additional film, oxygen desorption of the positive electrode is suppressed and interface stability between the positive electrode and the non-aqueous electrolyte is secured, thereby enabling the implementation of a lithium secondary battery having excellent life performance, high-temperature storage performance, and resistance reduction effect. The lithium secondary battery of the present invention can exhibit even more desirable effects, particularly when operating at high voltage where problems such as electrolyte depletion, gas generation, and oxygen desorption of the positive electrode active material become severe. The lithium secondary battery includes a negative electrode; a positive electrode; a separator; and a non-aqueous electrolyte. Specifically, the lithium secondary battery includes a negative electrode; a positive electrode opposing the negative electrode; a separator interposed between the negative electrode and the positive electrode; and a non-aqueous electrolyte. The lithium secondary battery can be manufactured by housing an electrode assembly including the negative electrode; a positive electrode opposing the negative electrode; and a separator interposed between the negative electrode and the positive electrode in a battery case, and then injecting a non-aqueous electrolyte. (1) Bipolar The above positive electrode contains 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 Y1 O2(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. Specifically, the positive electrode active material may include a lithium transition metal oxide represented by the following chemical formula A. [Chemical Formula A] Li 1+x [Ni a Co b Mn c M 1 d ]O 2+w In the above chemical formula A, 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. Since the compound represented by the above chemical formula A has a lower nickel content than a high-nickel lithium transition metal oxide (e.g., a lithium transition metal oxide containing nickel in an amount of 70 mol% or more among transition metals), it needs to be driven at a high voltage (e.g., 4.35 V or higher) to increase the energy density of the positive electrode, and when driven at such a high voltage, the positive electrode electrolyte side reaction is aggravated, so there may be a problem that the life performance and storage performance are significantly reduced. However, the lithium secondary battery according to the present invention can exhibit excellent long-term life performance, reduced resistance, and high-temperature storage performance even when driven at a high voltage by organically combining the first additive and the second additive described below. In the above chemical formula A, x can be 0≤x≤0.5, specifically 0≤x≤0.2. In the above chemical formula A, 0.5≤a≤0.7, specifically 0.55≤a≤0.65. In the chemical formula A, 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. In the chemical formula A, specifically, 0≤b≤0.1 may be satisfied. In the above chemical formula A, 0≤b / a≤0.2. Specifically, in the above chemical formula A, 0.05≤b / a≤0.2 may be satisfied. In the chemical formula A, 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 A, 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 cathode active material. Specifically, it may be 1.5 ≤ a / c ≤ 2.5. In the above chemical formula A, 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 the above chemical formula A, a / (b × c) may be 18 to 50, specifically 18 to 40, and more specifically 20 to 35. When within the above range, the contents of nickel, cobalt, and manganese in the chemical formula A are harmoniously adjusted, thereby enhancing the performance improvement effect by forming a positive electrode film through an additive and simultaneously improving the structural stability of the positive electrode active material. The above positive electrode active material may be in the form of particles. Specifically, the positive electrode active material is in the form of a single particle composed of one single nodule or a quasi-single particle which is a complex of 30 or fewer nodules, and specifically, the positive electrode active material may be a quasi-single particle which is a complex of 2 to 20 nodules, more specifically 2 to 10 nodules, or may be in a form including them. In this case, when manufacturing an electrode of the positive electrode active material, particle breakage is prevented, and occurrence of internal cracks due to volume expansion / contraction of the nodules during charge / discharge is prevented, so that the high-temperature life characteristics and high-temperature storage characteristics can be improved. The average particle diameter (D) of the above positive electrode active material 50 ) may be 1 μm to 10 μm, specifically 2 μm to 8 μm, and more specifically 3 μm to 7 μm. When the above range is satisfied, the processability during electrode manufacturing may be excellent, the electrolyte impregnation property may be increased, so that the electrochemical properties may be increased, and the resistance may be reduced and the output characteristics may be improved. The specific surface area of ​​the above positive electrode active material is 0.1 m 2 / g to 3.0m 2 / g, specifically 0.3m 2 / g to 2.5m 2 / g, more specifically 0.4m 2 / g to 1.8m 2 / g. When the above range is satisfied, the rolling characteristics of the electrode can be improved, and particle breakage can be reduced, thereby suppressing side reactions with the electrolyte. Additionally, the anode includes a first additive. The first additive may include at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1 and 1-2. Specifically, the first additive may include a compound represented by the following chemical formula 1-1. In the above chemical formula 1-1, Y 11 is nitrogen (N) or RY11 is a substituted carbon (C), and Y 12 is oxygen (O), sulfur (S), R Y121 Nitrogen (N) or R substituted Y122 and R Y123 is a substituted carbon (C), and Y 13 is nitrogen (N) or R Y13 is a substituted carbon (C), and Y 14 is nitrogen (N) or R Y14 is a substituted carbon (C), and Y 15 is nitrogen (N) or R Y15 is a substituted carbon (C), and at this time, Y 11 and Y 15 At least one of them is nitrogen (N), and Y 11 , Y 12 , Y 13 , Y 14 , and Y 15 At least one of them is carbon (C), and R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 At least one of them is a substituent represented by the chemical formula 1-a. [Chemical Formula 1-2] In the above chemical formula 1-2, Y 21 is nitrogen (N) or R Y21 is a substituted carbon (C), and Y 22 is nitrogen (N) or R Y22 is a substituted carbon (C), and Y 23 is nitrogen (N) or R Y23 is a substituted carbon (C), and Y24 is nitrogen (N) or R Y24 is a substituted carbon (C), and Y 25 is nitrogen (N) or R Y25 is a substituted carbon (C), and at this time, Y 21 , Y 22 , Y 23 , Y 24 and Y 25 At least one of them is carbon (C), and R Y21 , R Y22 , R Y23 , R Y24 and R Y25 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y21 , R Y22 , R Y23 , R Y24 and R Y25 At least one of them is a substituent represented by the chemical formula 1-a. [Chemical formula 1-a] In the above chemical formula 1-a, L1 is selected from a direct bond, an ester, an ether, and an alkylene group having 1 to 5 carbon atoms, R1 is a direct bond or an alkylene group having 1 to 5 carbon atoms, and R2 is *-CH=CH2 or *-C≡CH, wherein * is a bonding site. In general, in situations such as charging / discharging and storage of lithium secondary batteries, reactive oxygen desorption of the positive electrode active material, collapse of the positive electrode active material structure due to the desorption of the reactive oxygen, and dissolution of transition metals may become problems. In the case of the reactive oxygen, it reacts with the organic solvent of the electrolyte to generate byproducts such as CO, CO2, and H2O, and among these, H2O decomposes lithium salt to generate HF, and this HF promotes the desorption of transition metals and desorbs oxygen again, which may accelerate the deterioration of life performance and storage performance. In particular, this problem is further aggravated when operating at high voltage. To solve these problems, the present invention includes the first additive in the positive electrode. The first additive includes at least one compound selected from the compounds represented by the chemical formulas 1-1 and 1-2, and acts as a Lewis base capable of capturing HF, which is a Lewis acid, thereby blocking the generation of reactive oxygen by HF. In addition, the compound represented by the chemical formula 1 contains an unsaturated hydrocarbon (a substituent represented by the chemical formula 1-a) such as a vinyl group or a propargyl group in the structure, so that a highly durable positive electrode film can be easily formed. In addition, the present invention is characterized in that the first additive is included in the positive electrode and not in the non-aqueous electrolyte. For example, if the first additive is included in the non-aqueous electrolyte and not in the positive electrode, it is difficult to achieve the positive electrode film formation effect described above due to the first additive being reduced and decomposed at the negative electrode, thereby causing an undesirable increase in resistance, or the first additive being consumed at the negative electrode. Meanwhile, it is difficult to achieve the desired high-temperature durability and long-term life performance improvement effects simply by including the first additive in the positive electrode due to the problem of weakening the structural stability of the positive electrode active material and increasing resistance due to the absence of formation of a sulfur (S)-based film component. Accordingly, the present invention is characterized by including a second additive capable of forming an additional positive electrode film through a chemical reaction with the first additive or a positive electrode film derived therefrom in the non-aqueous electrolyte. Specifically, the non-aqueous electrolyte including the second additive impregnates the positive electrode, and the first additive and the second additive can react with each other in an activation process, etc., to form an additional electrode film. At this time, the compound represented by Chemical Formula 1-1 and / or the compound represented by Chemical Formula 1-2 included in the first additive has sp in its structure. 2Since it contains nitrogen (N) having a hybrid orbital, it is advantageous for reaction with the cyclic sulfur oxide included in the second additive. The electrode film formed by the reaction of the first and second additives is not only advantageous for the structural stability of the positive electrode, but is also effective in reducing resistance. The second additive will be described later. In the above chemical formula 1-1, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 may be independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a. Specifically, in the chemical formula 1-1, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 can be independently selected from hydrogen, a methyl group, and a substituent represented by the following chemical formula 1-a. In this case, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 At least one of the above may be a substituent represented by the chemical formula 1-a. Specifically, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 One of them may be a substituent represented by the above chemical formula 1-a, and the others other than the substituents represented by the above chemical formula 1-a may independently be hydrogen or an alkyl group having 1 to 3 carbon atoms, specifically hydrogen or a methyl group, more specifically hydrogen. In the above chemical formula 1-2, R Y21 , RY22 , R Y23 , R Y24 and R Y25 may be independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a. Specifically, R Y21 , R Y22 , R Y23 , R Y24 and R Y25 can be independently selected from hydrogen, a methyl group, and a substituent represented by the following chemical formula 1-a. In this case, R Y21 , R Y22 , R Y23 , R Y24 and R Y25 At least one of the above may be a substituent represented by the chemical formula 1-a. Specifically, R Y21 , R Y22 , R Y23 , R Y24 and R Y25 Among them, one of which is not a substituent represented by the above chemical formula 1-a, the rest may independently be hydrogen or an alkyl group having 1 to 3 carbon atoms, specifically hydrogen or a methyl group, more specifically hydrogen. At this time, hydrogen or an alkyl group having 1 to 3 carbon atoms does not cause steric hindrance, and thus does not interfere with the anodic film-forming effect of the substituent represented by the above chemical formula 1-a or the HF scavenging effect of the nitrogen-containing heteroaromatic compound of the chemical formula 1-1 and / or chemical formula 1-2. [Chemical formula 1-a] In the above chemical formula 1-a, L1 can be selected from a direct bond, an ester, an ether, and an alkylene group having 1 to 5 carbon atoms. Specifically, L1 can be a direct bond or an ester. More specifically, L1 can be an ester. When L1 is an ester (*-C(=O)O-*), the bonding positions of the two bonding sites (*) are not particularly limited, but the bonding site adjacent to oxygen is bonded to R1, and the bonding site adjacent to the carbonyl carbon is a bonding site that is not bonded to R1, specifically, Y. 11 , Y 12 , Y 13 , Y 14 , or Y 15 ; Y 21 , Y 22 , Y 23 , Y 24 or Y 25 ; can be combined with. R1 can be a direct bond or an alkylene group having 1 to 5 carbon atoms. Specifically, R1 can be a direct bond or an alkylene group having 1 to 3 carbon atoms. R2 can be *-CH=CH2 or *-C≡CH, specifically *-C≡CH. The compound represented by the above chemical formula 1-1 may include at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1-A, 1-1-B, 1-1-C, 1-1-D, 1-1-E and 1-1-F, and specifically may include a compound represented by the following chemical formula 1-1-A. [Chemical Formula 1-1-A] [Chemical Formula 1-1-B] [Chemical Formula 1-1-C] [Chemical Formula 1-1-D] [Chemical Formula 1-1-E] [Chemical Formula 1-1-F] . In the above chemical formulas 1-1-A, 1-1-B, 1-1-C, 1-1-D, 1-1-E and 1-1-F, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 is as defined in chemical formula 1-1. The compound represented by the above chemical formula 1-2 may include at least one selected from the group consisting of compounds represented by the following chemical formulas 1-2-A, 1-2-B, 1-2-C, 1-2-D, and 1-2-E. [Chemical Formula 1-2-A] [Chemical Formula 1-2-B] [Chemical Formula 1-2-C] [Chemical Formula 1-2-D] [Chemical Formula 1-2-E] . In the above chemical formulas 1-2-A, 1-2-B, 1-2-C, 1-2-D and 1-2-E, R Y21 , R Y22 , R Y23 , R Y24 and R Y25 is as defined in chemical formula 1-2. Specifically, the compound represented by the chemical formula 1-1 may include at least one selected from the group consisting of compounds represented by the chemical formulas 1-1-A1 to 1-1-A4 below, and more specifically, may include a compound represented by the chemical formula 1-1-A1. [Chemical Formula 1-1-A1] [Chemical Formula 1-1-A2] [Chemical Formula 1-1-A3] [Chemical Formula 1-1-A4] . The above first additive may be included in the positive electrode in an amount of 0.004 to 8 parts by weight, specifically 0.04 to 4 parts by weight, and more specifically 0.1 to 2 parts by weight, relative to 100 parts by weight of the positive electrode active material. Within the above range, the capacity securing effect due to the inclusion of the positive electrode active material may be sufficiently expressed, while the positive electrode film forming effect due to the above-described first additive may be preferably implemented. 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 and the first additive 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. Descriptions of other positive electrode active materials and the first additive are omitted as they have 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 and the first additive. 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 agent 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 includes 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 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. 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 silicon (Si), silicon oxide (SiOx (0 <x<2)로 표시될 수 있음) 및 실리콘-탄소 복합체로 이루어진 군에서 선택된 적어도 1종을 포함할 수 있다. 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 current collector is not particularly limited as long as it has high conductivity without causing chemical changes in the battery. Specifically, the negative 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%. 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, KETJENBLACK®, 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. (4) Non-aqueous electrolyte The above non-aqueous electrolyte comprises a lithium salt, an organic solvent and a second additive. 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 - , 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 - , (FSO2)2N - , CF3CF2(CF3)2CO - , (CF3SO2)2CH - , CH3SO3 - , CF3(CF2)7SO3 - , CF3CO2 - , CH3CO2 - , SCN - and (CF3CF2SO2)2N - It may include at least one selected from the group consisting of: Specifically, the lithium salts are 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). Specifically, the lithium salt may include at least one 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). 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 dissociating a lithium salt in the electrolyte well, 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), and even more specifically, may include ethylene carbonate (EC). 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, ethylmethyl carbonate (EMC), methylpropyl carbonate, and ethylpropyl carbonate, and more specifically may include at least one selected from the group consisting of ethylmethyl carbonate (EMC) and diethyl carbonate (DEC), and even more specifically may include ethylmethyl carbonate (EMC) and diethyl carbonate (DEC). When the linear carbonate organic solvent includes ethyl methyl carbonate (EMC) and diethyl carbonate (DEC), the volume ratio of ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) may be 50:50 to 90:10, specifically 80:20 to 90:10, and more specifically 85:15 to 90:10. 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 10:90 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. 4) Additives The above non-aqueous electrolyte comprises a second additive. The second additive comprises a cyclic sulfur oxide. The cyclic sulfur oxide can form an additional anode film through a chemical reaction with the first additive or a cathode film derived therefrom. Specifically, the nitrogen-containing heteroaromatic compound in the first additive or a cathode film component derived therefrom can form an additional cathode film that can improve the high-temperature durability and long-life performance of the cathode by ring-opening the cyclic sulfur oxide-based compound. In addition, the compound of Chemical Formula 1-1 and / or Chemical Formula 1-2 included in the first additive is sp2 Since nitrogen having a hybrid orbital is contained in the structure, a reaction with the cyclic sulfur oxide can occur stably. The present invention is characterized by including a first additive in the positive electrode and a second additive in the non-aqueous electrolyte at the same time, whereby the film formation of the positive electrode can be smoothly performed without unnecessary consumption due to reduction at the negative electrode or problems of increased negative electrode resistance. For example, if both the first additive and the second additive are included in the non-aqueous electrolyte, the first and second additives react and are consumed during reduction of the negative electrode, so that the effect of improving high-temperature durability due to strengthening the film of the positive electrode cannot be achieved. In addition, if both the first and second additives are included in the positive electrode, the viscosity of the slurry including them increases during the manufacture of the positive electrode, which ultimately causes poor quality of the electrode. On the other hand, if the second additive is included in the positive electrode and the first additive is included in the non-aqueous electrolyte, the problem of uneven formation of the film on the surface of the positive electrode active material occurs due to a side reaction with Li by-products. The above cyclic sulfur oxides may include, for example, propane sultone, propene sultone, ethylene sulfate, ethylene sulfite, and methylene methane disulfonate within the structure. Specifically, the cyclic sulfur oxide may include at least one selected from the group consisting of compounds represented by the following Chemical Formula 2-a, Chemical Formula 2-b, Chemical Formula 2-c, Chemical Formula 2-d, Chemical Formula 2-e, Chemical Formula 2-f, and Chemical Formula 2-g. More specifically, the cyclic sulfur oxide may include a compound represented by the following Chemical Formula 2-a. [Chemical formula 2-a] In the above chemical formula 2-a, X 11 and X 12 are independently of each other *-O-* or *-C(R X11 )(R X12 )-* but, X 11 and X12 is at the same time *-C(R X11 )(R X12 )-*, not R 11 , R 14 , R X11 and R X12 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, and R 12 and R 13 is independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, a halogen group, or a substituent represented by the following chemical formula 3, or R 12 and R 13 A cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms formed by mutually fused rings, and R 12 and R 13 When forming an aryl group having 6 to 20 carbon atoms, R 11 and R 14 does not exist, i is an integer of 1 or 2, and * is a binding site. [Chemical Formula 3] In the above chemical formula 3, L 61 and L 62 are independently a direct bond or an alkylene group having 1 to 5 carbon atoms, A is a substituent represented by the following chemical formula 4, and X 61 and X 62 are independently of each other *-O-* or *-C(R X61 )(R X62 )-* but, X 11 and X 12 is at the same time *-C(R X61 )(R X62 )-*, not R 63 , R X61 and R X62are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, and R 61 and R 62 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or a halogen group, or R 62 and R 63 A cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, or a cycloalkynyl group having 5 to 20 carbon atoms formed by mutually fused rings, k is an integer of 1 or 2, and * is a bonding site. [Chemical Formula 4] In the above chemical formula 4, l is an integer of 1 or 2, and * is a binding site. In the above chemical formula 2-a, X 11 and X 12 are independently of each other *-O-* or *-C(R X11 )(R X12 )-* but, X 11 and X 12 is at the same time *-C(R X11 )(R X12 )-* is not. For example, X 11 and X 12 are all *-O-* or; X 11 is *-C(R X11 )(R X12 )-* and X 12 can be *-O-*. R 11 , R 14 , R X11 and R X12may be independently selected from hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, and a halogen (which may be F, Cl, Br, or I), and specifically may be independently selected from hydrogen, a methyl group, *-CH=CH2, *-C≡CH, and fluorine (F). R 12 and R 13 can be independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, a halogen group, and specifically, can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH, or fluorine (F). or R 12 and R 13 These may form a fused ring to form a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms. In this case, R 12 and R 13 When forming an aryl group having 6 to 20 carbon atoms, R 11 and R 14 does not exist. For example, R 12 and R 13 When these two fused rings are formed, a benzene group can be formed, and in this case R 11 and R 14 may not exist. or R 12 and R 13 may be independently a substituent represented by the chemical formula 3 above. In the chemical formula 3 above, L 61 and L 62can be independently a direct bond or an alkylene group having 1 to 5 carbon atoms, specifically can be independently a direct bond or an alkylene group having 1 to 3 carbon atoms, more specifically can be independently a direct bond or a methylene group, and even more specifically can each be a methylene group. X 61 and X 62 are independently of each other *-O-* or *-C(R X61 )(R X62 )-* but, X 11 and X 12 is at the same time *-C(R X61 )(R X62 )-* may not be. For example, X 61 and X 62 are all *-O-* or; X 61 is *-C(R X61 )(R X62 )-* and X 62 can be *-O-*. R 63 , R X61 and R X62 may independently be hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, and specifically, may independently be hydrogen, a methyl group *-CH=CH2, *-C≡CH, or fluorine (F). R 61 and R 62 may independently be hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or a halogen group, and specifically, may independently be hydrogen, a methyl group *-CH=CH2, *-C≡CH, or fluorine (F). or R 62 and R 63These may form a fused ring to form a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, or a cycloalkynyl group having 5 to 20 carbon atoms. [Chemical formula 2-b] In the above chemical formula 2-b, R 21 , R 22 , R 23 and R 24 can be independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen. Specifically, R 21 , R 22 , R 23 and R 24 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). [Chemical formula 2-c] In the above chemical formula 2-c, R 31 , R 32 , R 33 and R 34 can be independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen. Specifically, R 31 , R 32 , R 33 and R 34 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). [Chemical formula 2-d] In the above chemical formula 2-d, R 41 , R 42 , R 43 and R 46 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen. Specifically, R41 , R 42 , R 43 and R 46 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). R 44 and R 45 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, or R 44 and R 45 is a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms formed by mutually fused rings, and R 44 and R 45 When R forms an aryl group having 6 to 20 carbon atoms, 43 and R 46 does not exist. Specifically, R 44 and R 45 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). or R 44 and R 45 may form a fused ring with each other to form a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms. In this case, R 44 and R 45 When R forms an aryl group having 6 to 20 carbon atoms, 43 and R 46 does not exist. For example, R 44 and R 45 When they form a fused ring, they can form a benzene group, and in this case, R 43 and R 46 may not exist. [Chemical formula 2-e] In the above chemical formula 2-e, X 51 and X 52 are independently of each other *-O-* or *-C(R X51 )(R X52 )-* but, X 51 and X 52 is at the same time *-C(R X51 )(R X52 )-*, not R 51 , R 52 , R 53 , R 54 , R 55 , R 56 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, and j is an integer of 1 or 2. For example, X 51 and X 52 are all *-O-* or; X 51 is *-C(R X51 )(R X52 )-* and X 52 can be *-O-*. Also, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen. Specifically, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). [Chemical formula 2-f] In the above chemical formula 2-f, X 71 and X 72are independently of each other *-O-* or *-C(R X71 )(R X72 )-* but, X 71 and X 72 is at the same time *-C(R X71 )(R X72 )-*, not X 73 and X 74 are independently of each other *-O-* or *-C(R X73 )(R X74 )-* but, X 73 and X 74 is at the same time *-C(R X73 )(R X74 )-*, not R X71 , R X72 , R X73 , R X74 are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, m and n are each independently an integer of 1 or 2, and * is a bonding site. For example, X 71 and X 72 are all *-O-* or; X 71 is *-C(R X71 )(R X72 )-* and X 72 can be *-O-*. Also, for example, X 73 and X 74 are all *-O-* or; X 73 Silver *-C(R X73 )(R X73 )-* and X 74 can be *-O-*. Also, R X71 , R X72 , R X73 , R X74 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen. Specifically, R X71 , R X72 , R X73 , RX74 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). [Chemical formula 2-g] In the above chemical formula 2-g, R 81 , R 82 , R 83 and R 84 can be independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen. Specifically, R 81 , R 82 , R 83 and R 84 can be independently hydrogen, a methyl group *-CH=CH2, *-C≡CH or fluorine (F). Specifically, the cyclic sulfur oxide may include at least one selected from the group consisting of compounds represented by Chemical Formulae 2-a-1 to 2-a-25, Chemical Formula 2-b-1, Chemical Formula 2-c-1, Chemical Formula 2-d-1, Chemical Formula 2-e-1, Chemical Formula 2-e-2, Chemical Formula 2-f-1, and Chemical Formula 2-g-1. For example, the compound represented by Chemical Formula 2-a may include at least one selected from the group consisting of compounds represented by Chemical Formulae 2-a-1 to 2-a-25. In addition, the compound represented by Chemical Formula 2-b may include a compound represented by Chemical Formula 2-b-1. In addition, the compound represented by Chemical Formula 2-c may include a compound represented by Chemical Formula 2-c-1. In addition, the compound represented by Chemical Formula 2-d may include a compound represented by Chemical Formula 2-d-1. In addition, the compound represented by the chemical formula 2-e may include at least one selected from the group consisting of compounds represented by the chemical formula 2-e-1 and chemical formula 2-e-2. In addition, the compound represented by the chemical formula 2-f may include a compound represented by the chemical formula 2-f-1. More specifically, the cyclic sulfur oxide may include at least one selected from the group consisting of compounds represented by the following chemical formulae 2-a-1 to 2-a-10, chemical formula 2-b-1, chemical formula 2-c-1, chemical formula 2-d-1, chemical formula 2-e-1, chemical formula 2-e-2, and chemical formula 2-f-1. More specifically, the cyclic sulfur oxide may include at least one selected from the group consisting of compounds represented by Chemical Formula 2-a-1, Chemical Formula 2-a-2, Chemical Formula 2-a-3, Chemical Formula 2-a-4, Chemical Formula 2-a-6, Chemical Formula 2-a-10, and Chemical Formula 2-b-1 below. Even more specifically, the cyclic sulfur oxide may include at least one selected from the group consisting of compounds represented by Chemical Formula 2-a-1, Chemical Formula 2-a-4, Chemical Formula 2-a-10, and Chemical Formula 2-b-1 below. Even more specifically, the cyclic sulfur oxide may include at least one selected from the group consisting of compounds represented by Chemical Formula 2-a-1, Chemical Formula 2-a-10, and Chemical Formula 2-b-1 below. Even more specifically, the cyclic sulfur oxide may include a compound represented by Chemical Formula 2-a-10 below. [Chemical formula 2-a-1] [Chemical formula 2-a-2] [Chemical formula 2-a-3] [Chemical formula 2-a-4] [Chemical formula 2-a-5] [Chemical formula 2-a-6] [Chemical formula 2-a-7] [Chemical formula 2-a-8] [Chemical formula 2-a-9] [Chemical formula 2-a-10] [Chemical formula 2-a-11] [Chemical formula 2-a-12] [Chemical formula 2-a-13] [Chemical Formula 2-a-14] [Chemical formula 2-a-15] [Chemical formula 2-a-16] [Chemical formula 2-a-17] [Chemical formula 2-a-18] [Chemical Formula 2-a-19] [Chemical formula 2-a-20] [Chemical Formula 2-a-21] [Chemical formula 2-a-22] [Chemical Formula 2-a-23] [Chemical Formula 2-a-24] [Chemical Formula 2-a-25] [Chemical formula 2-b-1] [Chemical formula 2-c-1] [Chemical formula 2-d-1] [Chemical formula 2-e-1] [Chemical formula 2-e-2] [Chemical formula 2-f-1] [Chemical formula 2-g-1] . . The second additive may be included in the non-aqueous electrolyte at 0.01 wt% to 10 wt%, specifically 0.05 wt% to 7 wt%, more specifically 0.1 wt% to 2 wt%, and more specifically 0.5 wt% to 1.5 wt%. When the second additive is used in the content range described above, the reactive oxygen capture effect occurring during initial activation can be sufficiently exerted, and concerns about increased resistance when added in excessive amounts can be prevented. The weight ratio of the first additive included in the positive electrode and the weight of the second additive included in the non-aqueous electrolyte may be 5:95 to 95:5, specifically 10:90 to 92:8, more specifically 30:70 to 70:30, and even more specifically 40:60 to 60:40. When the weight ratio is as described above, the effects of the combined use of the first additive and the second additive are harmoniously achieved, and as a result, the effects of improving the high-temperature life performance, high-temperature storage performance, and safety of the lithium secondary battery can be preferably expressed. The above additive may further include an additional additive (which may be designated as a third additive) along with the first additive and the second additive. The additional additive may be included in the non-aqueous electrolyte to prevent the non-aqueous electrolyte from being decomposed in a high-power environment and 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 be at least one selected from the group consisting of vinylene carbonate, vinyl ethylene carbonate, fluoroethylene carbonate, succinonitrile, adiponitrile, ethylene sulfate, lithium bis-(oxalato)borate (LiBOB), 3-trimethoxysilanyl-propyl-N-aniline (TMSPa), and tris(trimethylsilyl) phosphate (TMSPi), and specifically, vinylene carbonate. The above additional additive may be included in the non-aqueous electrolyte in an amount of 0.1 wt% to 15 wt%. 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) As an organic solvent, a mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) in a volume ratio of 20:70:10 was used. A non-aqueous electrolyte was prepared by adding LiPF6 as a lithium salt and a compound represented by the chemical formula 2-a-1 as a second additive to the above 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 chemical formula 2-a-1 was included in the non-aqueous electrolyte at 1 wt%. (Lithium secondary battery manufacturing) Positive active material (Li[Ni 0.6 Co 0.1 Mn 0.3 ]O2): First additive (compound represented by chemical formula 1-1-A1): Conductive agent (carbon nanotube): Binder (polyvinylidene fluoride) was added to N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 97.00:0.08:1.52:1.40 to prepare a cathode slurry (solid content 72 wt%). The cathode slurry was applied to one surface of a cathode current collector (Al thin film) having a thickness of 12 μm, dried and roll pressed to form a cathode active material layer (thickness: 115 μm), which was used as a cathode. A negative electrode slurry (solid content: 54 wt%) was prepared by adding negative electrode active material (a mixture of graphite and silicon-carbon composite in a weight ratio of 95:5): conductive material (a mixture of graphite and silicon-carbon composite in a weight ratio of 95:5): binder (styrene-butadiene rubber and carboxymethyl cellulose) to distilled water as a solvent in a weight ratio of 94.9:0.5:4.6. The negative electrode slurry was applied to one surface of a 6 μm thick negative electrode collector (Cu thin film), dried, and roll pressed to form a negative electrode active material layer (thickness: 160 μm), which was used as 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 lithium 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 a compound represented by the chemical formula 2-a-4 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the compound represented by the chemical formula 2-a-1 as a second additive. 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 2-b-1 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the compound represented by the chemical formula 2-a-1 as a second additive. 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 chemical formula 2-a-10 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the compound represented by the chemical formula 2-a-1 as a second additive. 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 chemical formula 2-a-2 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the compound represented by the chemical formula 2-a-1 as a second additive. Example 6 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 chemical formula 2-a-3 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the compound represented by the chemical formula 2-a-1 as a second additive. Example 7 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 chemical formula 2-a-6 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the compound represented by the chemical formula 2-a-1 as a second additive. Comparative Example 1 (Manufacture of non-aqueous electrolyte) A non-aqueous electrolyte was prepared in the same manner as in Example 1, except that the second additive (a compound represented by the chemical formula 2-a-1) was not added to the non-aqueous electrolyte. (Lithium secondary battery manufacturing) Positive active material (Li[Ni 0.6 Co 0.1 Mn 0.3 ]O2): Conductive agent (carbon nanotube): Binder (polyvinylidene fluoride) was added to N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 97.00:1.56:1.44 to prepare a cathode slurry (solid content 72 wt%). The cathode slurry was applied to one surface of a 12 μm thick cathode current collector (Al thin film), dried, and roll pressed to form a cathode active material layer (thickness: 115 μm), which was used as a cathode. A lithium secondary battery was manufactured in the same manner as in Example 1, except that the non-aqueous electrolyte and positive electrode manufactured above were used. Comparative Example 2 (Manufacture of non-aqueous electrolyte) A non-aqueous electrolyte was prepared in the same manner as in Example 1, except that a compound represented by the chemical formula 1-1-A1 was added to the non-aqueous electrolyte in an amount of 1 wt% instead of the second additive (a compound represented by the chemical formula 2-a-1). (Lithium secondary battery manufacturing) The anode was manufactured using the same method as in Comparative Example 1. A lithium secondary battery was manufactured in the same manner as in Example 1, except that the non-aqueous electrolyte and positive electrode manufactured above were used. Comparative Example 3 (Manufacture of non-aqueous electrolyte) A non-aqueous electrolyte was prepared using the same method as in Example 1. (Lithium secondary battery manufacturing) The anode was manufactured using the same method as in Comparative Example 1. A lithium secondary battery was manufactured in the same manner as in Example 1, except that the non-aqueous electrolyte and positive electrode manufactured above were used. Comparative Example 4 (Manufacture of non-aqueous electrolyte) A non-aqueous electrolyte was prepared in the same manner as in Example 1, except that the compound represented by the chemical formula 1-1-A1 was further added to the non-aqueous electrolyte in an amount of 1 wt%. (Lithium secondary battery manufacturing) The anode was manufactured using the same method as in Comparative Example 1. A lithium secondary battery was manufactured in the same manner as in Example 1, except that the non-aqueous electrolyte and positive electrode manufactured above were used. Comparative Example 5 (Manufacture of non-aqueous electrolyte) A non-aqueous electrolyte was prepared using the same method as in Comparative Example 1. (Lithium secondary battery manufacturing) A lithium secondary battery was manufactured in the same manner as in Example 1, except that the non-aqueous electrolyte manufactured above was used. Comparative Example 6 (Manufacture of non-aqueous electrolyte) A non-aqueous electrolyte was prepared using the same method as in Comparative Example 2. (Lithium secondary battery manufacturing) Cathode active material (Li[Ni 0.6 Co 0.1 Mn 0.3 ]O2): Second additive (compound represented by chemical formula 2-a-1): Conductive agent (carbon nanotube): Binder (polyvinylidene fluoride) was added to N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 97.00:0.08:1.52:1.40 to prepare a cathode slurry (solid content 72 wt%). The cathode slurry was applied to one surface of a cathode current collector (Al thin film) having a thickness of 12 μm, dried and roll pressed to form a cathode active material layer (thickness: 115 μm), which was used as a cathode. A lithium secondary battery was manufactured in the same manner as in Example 1, except that the non-aqueous electrolyte and positive electrode manufactured above were used. Experimental example Experimental Example 1: Evaluation of High Temperature Cycle Performance The lithium secondary batteries manufactured in Examples 1 to 7 and Comparative Examples 1 to 6 above were charged to 4.35 V, 1 / 40 C using an electrochemical charger / discharger under CC / CV, 0.33 C conditions at 45°C, and then discharged to 2.0 V under CC, 0.33 C conditions, which constituted one cycle, and 300 charge / discharge cycles were performed. (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 300 cycles / discharge capacity after 1 cycle)} × 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 300 cycles of charge and discharge, the resistance after 300 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 300 cycles - Initial resistance) / Initial resistance × 100 (3) Gas generation amount After 300 charge-discharge cycles, the amount of gas generated from the lithium secondary battery was measured using GC-FID / TCD, and the results are shown in Table 1 below. Experimental Example 1 Capacity maintenance rate (%) Resistance increase rate (%) Gas generation amount (μL) Example 196.115.71850 Example 295.917.31970 Example 395.416.81810 Example 496.314.31780 Example 594.218.82050 Example 693.819.32170 Example 794.121.12500 Comparative Example 159.355.36550 Comparative Example 268.848.45400 Comparative Example 371.240.94900 Comparative Example 473.835.73900 Comparative Example 585.325.13500 Comparative Example 689.523.52700 Referring to Table 1 above, it can be confirmed that the lithium secondary batteries of Examples 1 to 7, which are lithium secondary batteries manufactured by combining a positive electrode including a first additive and a non-aqueous electrolyte including a second additive, have a higher capacity retention rate, a lower resistance increase rate, and less gas generation during high-temperature cycle charge and discharge than those of Comparative Examples 1 to 6. Experimental Example 2: Evaluation of High Temperature Storage Performance The lithium secondary batteries manufactured in Examples 1 to 7 and Comparative Examples 1 to 6 above were charged to 4.35 V, 1 / 40 C under CC / CV, 0.33 C conditions at 25°C and discharged to 2.0 V at 0.33 C to perform initial charge / discharge, and then charged to 4.35 V, 1 / 40 C under CC / CV, 0.33 C conditions at 25°C and then stored at 60°C for 12 weeks. (1) Capacity maintenance rate After 12 weeks of storage, the lithium secondary battery was charged to 4.35 V, 1 / 40 C under CC / CV, 0.33 C conditions at 25°C and discharged to 2.0 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 2 below. Capacity retention rate (%) = (discharge capacity after 12 weeks of storage / initial discharge capacity) × 100 (2) Resistance increase rate After the initial charge / discharge 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 2.5 C, and the resistance was measured from the voltage drop difference at this time, which was used as the initial resistance. After 12 weeks of storage at 60°C, 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) × 100 (3) Gas generation amount After 12 weeks of storage, the amount of gas generated from the lithium secondary battery was measured using GC-FID / TCD, and the results are shown in Table 2 below. Experimental Example 2 Capacity maintenance rate (%) Resistance increase rate (%) Gas generation amount (μL) Example 197.613.81760 Example 296.914.91840 Example 396.217.31680 Example 497.916.91710 Example 593.119.81950 Example 694.321.51890 Example 792.623.32130 Comparative Example 161.548.27300 Comparative Example 273.139.36210 Comparative Example 374.237.95900 Comparative Example 476.835.34800 Comparative Example 581.629.53650 Comparative Example 688.526.32640 Referring to Table 2 above, it can be confirmed that the lithium secondary batteries of Examples 1 to 7, which are lithium secondary batteries manufactured by combining a positive electrode including a first additive and a non-aqueous electrolyte including a second additive, have a higher capacity retention rate, a lower resistance increase rate, and less gas generation when stored at high temperatures, compared to Comparative Examples 1 to 6.

Claims

1. Containing a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte; The above positive electrode comprises a positive electrode active material and a first additive, The above non-aqueous electrolyte comprises a lithium salt, an organic solvent and a second additive, The above first additive comprises at least one selected from the group consisting of compounds represented by the following chemical formulas 1-1 and 1-2, The second additive is a lithium secondary battery including a cyclic sulfur oxide compound: [Chemical Formula 1-1] In the above chemical formula 1-1, Y 11 is nitrogen (N) or R Y11 is a substituted carbon (C), and Y 12 is oxygen (O), sulfur (S), R Y121 Nitrogen (N) or R substituted Y122 and R Y123 is a substituted carbon (C), and Y 13 is nitrogen (N) or R Y13 is a substituted carbon (C), and Y 14 is nitrogen (N) or R Y14 is a substituted carbon (C), and Y 15 is nitrogen (N) or R Y15 is a substituted carbon (C), and at this time, Y 11 and Y 15 At least one of them is nitrogen (N), and Y 11 , Y 12 , Y 13 , Y 14 , and Y 15 At least one of them is carbon (C), R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 At least one of them is a substituent represented by the chemical formula 1-a, [Chemical Formula 1-2] In the above chemical formula 1-2, Y 21 is nitrogen (N) or R Y21 is a substituted carbon (C), and Y 22 is nitrogen (N) or R Y22 is a substituted carbon (C), and Y 23 is nitrogen (N) or R Y23 is a substituted carbon (C), and Y 24 is nitrogen (N) or R Y24 is a substituted carbon (C), and Y 25 is nitrogen (N) or R Y25 is a substituted carbon (C), and at this time, Y 21 , Y 22 , Y 23 , Y 24 and Y 25 At least one of them is carbon (C), R Y21 , R Y22 , R Y23 , R Y24 and R Y25 are independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, and a substituent represented by the following chemical formula 1-a, wherein R Y21 , R Y22 , R Y23 , R Y24 and R Y25 At least one of them is a substituent represented by the chemical formula 1-a, [Chemical formula 1-a] In the above chemical formula 1-a, L1 is selected from a direct bond, an ester, an ether, and an alkylene group having 1 to 5 carbon atoms, R1 is a direct bond or an alkylene group having 1 to 5 carbon atoms, and R2 is *-CH=CH2 or *-C≡CH, wherein * is a bonding site.

2. In claim 1, A lithium secondary battery comprising at least one compound represented by the chemical formula 1-1, selected from the group consisting of compounds represented by the following chemical formulas 1-1-A, 1-1-B, 1-1-C, 1-1-D, 1-1-E and 1-1-F: [Chemical Formula 1-1-A] [Chemical Formula 1-1-B] [Chemical Formula 1-1-C] [Chemical Formula 1-1-D] [Chemical Formula 1-1-E] [Chemical Formula 1-1-F] . In the above chemical formulas 1-1-A, 1-1-B, 1-1-C, 1-1-D, 1-1-E and 1-1-F, R Y11 , R Y121 , R Y122 , R Y123 , R Y13 , R Y14 and R Y15 is as defined in chemical formula 1-1.

3. In claim 1, A lithium secondary battery comprising at least one compound represented by the chemical formula 1-2, selected from the group consisting of compounds represented by the following chemical formulas 1-2-A, 1-2-B, 1-2-C, 1-2-D and 1-2-E: [Chemical Formula 1-2-A] [Chemical Formula 1-2-B] [Chemical Formula 1-2-C] [Chemical Formula 1-2-D] [Chemical Formula 1-2-E] . In the above chemical formulas 1-2-A, 1-2-B, 1-2-C, 1-2-D and 1-2-E, R Y21 , R Y22 , R Y23 , R Y24 and R Y25 is as defined in chemical formula 1-2.

4. In claim 1, A lithium secondary battery wherein the first additive comprises a compound represented by the chemical formula 1-1.

5. In claim 1, A lithium secondary battery comprising at least one compound represented by the chemical formula 1-1 above, selected from the group consisting of compounds represented by the chemical formulas 1-1-A1 to 1-1-A4 below: [Chemical Formula 1-1-A1] [Chemical Formula 1-1-A2] [Chemical Formula 1-1-A3] [Chemical Formula 1-1-A4] .

6. In claim 1, A lithium secondary battery, wherein the first additive is included in the positive electrode in an amount of 0.004 to 8 parts by weight based on 100 parts by weight of the positive electrode active material.

7. In claim 1, A lithium secondary battery, wherein the first additive is included in the positive electrode in an amount of 0.04 to 4 parts by weight based on 100 parts by weight of the positive electrode active material.

8. In claim 1, A lithium secondary battery comprising at least one cyclic sulfur oxide compound selected from the group consisting of compounds represented by the following chemical formulas 2-a, 2-b, 2-c, 2-d, 2-e, 2-f and 2-g: [Chemical formula 2-a] In the above chemical formula 2-a, X 11 and X 12 are independently of each other *-O-* or *-C(R X11 )(R X12 )-* but, X 11 and X 12 is at the same time *-C(R X11 )(R X12 )-* is not, R 11 , R 14 , R X11 and R X12 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, R 12 and R 13 is independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, a halogen group, or a substituent represented by the following chemical formula 3, or R 12 and R 13 A cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms formed by mutually fused rings, and R 12 and R 13 When forming an aryl group having 6 to 20 carbon atoms, R 11 and R 14 does not exist, i is an integer of 1 or 2, * is the binding site, [Chemical formula 2-b] In the above chemical formula 2-b, R 21 , R 22 , R 23 and R 24 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, [Chemical formula 2-c] In the above chemical formula 2-c, R 31 , R 32 , R 33 and R 34 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, [Chemical formula 2-d] In the above chemical formula 2-d, R 41 , R 42 , R 43 and R 46 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, R 44 and R 45 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, or R 44 and R 45 is a cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, a cycloalkynyl group having 5 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms formed by mutually fused rings, and R 44 and R 45 When R forms an aryl group having 6 to 20 carbon atoms, 43 and R 46 does not exist, [Chemical formula 2-e] In the above chemical formula 2-e, X 51 and X 52 are independently of each other *-O-* or *-C(R X51 )(R X52 )-* but, X 51 and X 52 is at the same time *-C(R X51 )(R X52 )-* is not, R 51 , R 52 , R 53 , R 54 , R 55 , R 56 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, j is an integer of 1 or 2, [Chemical formula 2-f] In the above chemical formula 2-f, X 71 and X 72 are independently of each other *-O-* or *-C(R X71 )(R X72 )-* but, X 71 and X 72 is at the same time *-C(R X71 )(R X72 )-* is not, X 73 and X 74 are independently of each other *-O-* or *-C(R X73 )(R X74 )-* but, X 73 and X 74 is at the same time *-C(R X73 )(R X74 )-* is not, R X71 , R X72 , R X73 , R X74 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, m and n are integers 1 or 2, independently of each other, * is the binding site, [Chemical formula 2-g] In the above chemical formula 2-g, R 81 , R 82 , R 83 and R 84 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, [Chemical Formula 3] In the above chemical formula 3, L 61 and L 62 are independently a direct bond or an alkylene group having 1 to 5 carbon atoms, A is a substituent represented by the following chemical formula 4, X 61 and X 62 are independently of each other *-O-* or *-C(R X61 )(R X62 )-* but, X 11 and X 12 is at the same time *-C(R X61 )(R X62 )-* is not, R 63 , R X61 and R X62 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or halogen, R 61 and R 62 are independently hydrogen, an alkyl group having 1 to 10 carbon atoms, an alkylene group having 1 to 10 carbon atoms, an alkynyl group having 1 to 10 carbon atoms, or a halogen group, or R 62 and R 63 A cycloalkyl group having 5 to 20 carbon atoms, a cycloalkenyl group having 5 to 20 carbon atoms, or a cycloalkynyl group having 5 to 20 carbon atoms formed by fused rings, k is an integer of 1 or 2, * is the binding site, [Chemical Formula 4] In the above chemical formula 4, l is an integer of 1 or 2, and * is a binding site.

9. In claim 1, A lithium secondary battery comprising at least one compound selected from the group consisting of compounds represented by the following chemical formulae 2-a-1 to 2-a-25, chemical formulae 2-b-1, chemical formulae 2-c-1, chemical formulae 2-d-1, chemical formulae 2-e-1, chemical formulae 2-e-2, chemical formulae 2-f-1 and chemical formulae 2-g-1: [Chemical formula 2-a-1] [Chemical formula 2-a-2] [Chemical formula 2-a-3] [Chemical formula 2-a-4] [Chemical formula 2-a-5] [Chemical formula 2-a-6] [Chemical formula 2-a-7] [Chemical formula 2-a-8] [Chemical formula 2-a-9] [Chemical formula 2-a-10] [Chemical formula 2-a-11] [Chemical formula 2-a-12] [Chemical formula 2-a-13] [Chemical Formula 2-a-14] [Chemical formula 2-a-15] [Chemical formula 2-a-16] [Chemical formula 2-a-17] [Chemical formula 2-a-18] [Chemical Formula 2-a-19] [Chemical formula 2-a-20] [Chemical Formula 2-a-21] [Chemical formula 2-a-22] [Chemical Formula 2-a-23] [Chemical formula 2-a-24] [Chemical Formula 2-a-25] [Chemical formula 2-b-1] [Chemical formula 2-c-1] [Chemical formula 2-d-1] [Chemical formula 2-e-1] [Chemical formula 2-e-2] [Chemical formula 2-f-1] [Chemical formula 2-g-1] .

10. In claim 1, A lithium secondary battery, wherein the second additive is included in the non-aqueous electrolyte at 0.01 wt% to 10 wt%.

11. In claim 1, The above positive electrode active material is a lithium secondary battery including a lithium transition metal oxide of the following chemical formula A: [Chemical Formula A] Li 1+x [Ni a Co b Mr c M 1 d ]O 2+w In the above chemical formula A, 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.

12. In claim 1, The above negative electrode contains a negative electrode active material, A lithium secondary battery wherein the negative electrode active material includes at least one selected from the group consisting of carbon-based active materials and silicon-based active materials.

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