Specification Title of the invention: Electrode for lithium secondary battery and lithium secondary battery including the same Technical field [One] Mutual citation with related applications [2] This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0039365 filed on April 04, 2018, and all contents disclosed in the documents of the Korean patent application are included as part of this specification. [3] Technical field [4] The present invention relates to an electrode for a lithium secondary battery and a lithium secondary battery including the same, and more particularly, to an electrode suitable for a lithium secondary battery using a gel polymer electrolyte and a lithium secondary battery including the same. Background [5] As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing, and among such secondary batteries, lithium secondary batteries exhibit high energy density and operating potential, long cycle life, and low self-discharge rate. Batteries are commercialized and widely used. [6] In addition, as interest in environmental issues has increased in recent years, electric vehicles (EVs) and hybrid electric vehicles (HEVs) that can replace vehicles that use fossil fuels, such as gasoline vehicles and diesel vehicles, which are one of the main causes of air pollution. There is a lot of research on the back. [7] These electric vehicles (EV) and hybrid electric vehicles (HEV) use nickel-metal hydride (Ni-MH) secondary batteries or lithium secondary batteries with high energy density, high discharge voltage, and output stability as a power source. When used in an electric vehicle, it must be used for 10 years or more under severe conditions, as well as high energy density and high power output in a short period of time. Characteristics are inevitably required. [8] In general, lithium secondary batteries are manufactured using a negative electrode and a positive electrode, a separator interposed therebetween, and an electrolyte that is a transport medium for lithium ions.The conventional secondary battery is a liquid electrolyte, especially An ion conductive organic liquid electrolyte in which a salt is dissolved in a non-aqueous organic solvent has been mainly used. [9] However, when the electrolyte in a liquid state is used as described above, there is a high possibility that the electrode material is degraded and the organic solvent is volatilized, and there is a problem in safety such as combustion due to an increase in ambient temperature and the temperature of the battery itself. In particular, the lithium secondary battery has a problem in that the thickness of the battery is expanded by generating gas inside the battery due to decomposition of the carbonate organic solvent and/or side reaction between the organic solvent and the electrode during charging and discharging. Therefore, deterioration of battery performance and safety is essentially caused. [10] In general, the safety of the battery is improved in the order of liquid electrolyte [30] The electrode for a lithium secondary battery according to the present invention includes an electrode current collector and an electrode active material layer formed on one surface of the electrode current collector and including an electrode active material and an organic binder including an ethylenically unsaturated group. Meanwhile, the electrode for a lithium secondary battery according to an example of the present invention may be used as both a negative electrode and a positive electrode for a secondary battery. [31] [32] First, the case where the electrode for a lithium secondary battery according to the present invention is a positive electrode will be described first. When the electrode for a lithium secondary battery is a positive electrode, it includes a positive electrode current collector and a positive electrode active material layer formed on one surface of the positive electrode current collector. [33] The positive electrode current collector is not particularly limited as long as it has conductivity without causing chemical changes to the battery, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, or carbon on the surface of aluminum or stainless steel. , Nickel, titanium, silver, or the like may be used. In addition, it is possible to strengthen the bonding strength with the electrode active material layer by forming fine irregularities on the surface of the current collector, and can be used in various forms such as films, sheets, foils, nets, porous bodies, foams, and nonwoven fabrics, and 3㎛ to 500 It may have a thickness of ㎛. [34] The positive electrode active material is a compound capable of reversible intercalation and deintercalation of lithium, and specifically, may include at least one metal such as cobalt, manganese, nickel, or aluminum, and a lithium composite metal oxide containing lithium. . More specifically, the lithium composite metal oxide is a lithium-manganese oxide (eg, LiMnO 2 , LiMn 2 O 4, etc.), a lithium-cobalt oxide (eg, LiCoO 2, etc.), a lithium-nickel oxide (E.g., LiNiO 2 ), lithium-nickel-manganese oxide (e.g., LiNi 1-Y1 Mn Y1 O 2 (here, 0 [83] Next, a lithium secondary battery according to the present invention will be described. A lithium secondary battery according to another embodiment of the present invention includes a gel polymer electrolyte including a polymer network in which the electrode for a lithium secondary battery and an oligomer including a (meth)acrylate group are bonded in a three-dimensional structure. [84] [85] More specifically, a lithium secondary battery includes a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes, and a gel polymer electrolyte disposed between the positive and negative electrodes, and the separator. In this case, since the positive and negative electrodes are the same as those described above, detailed descriptions are omitted. [86] [87] As a separator for insulating the electrodes between the anode and the cathode, any commonly known polyolefin separator or a composite separator in which an organic or inorganic composite layer is formed on an olefin base may be used, and the separator is not particularly limited. [88] [89] The gel polymer electrolyte includes a polymer network in which oligomers including (meth)acrylate groups are bonded in a three-dimensional structure. The oligomer containing the (meth)acrylate group may be combined in a three-dimensional structure by forming a radical polymerization reaction with an organic binder included in the electrode active material layer as well as between oligomers. [90] For example, the oligomer may further include an oxyalkylene group. Specifically, the oligomer may be represented by the following formula (1). [91] [Formula 1] [92] [93] In Formula 1, A and A'are each independently a unit containing at least one (meth)acrylate group, and C 1 is a unit containing an oxyalkylene group. [94] Specifically, the units A and A'are units each independently including at least one (meth)acrylate group so that oligomers are bonded in a three-dimensional structure to form a polymer network. The units A and A'may be derived from monomers including monofunctional or polyfunctional (meth)acrylate or (meth)acrylic acid. [95] For example, the units A and A'may each independently include at least one or more of units represented by the following Formulas A-1 to A-5. [96] [Formula A-1] [97] [98] [Formula A-2] [99] [100] [Formula A-3] [101] [102] [Formula A-4] [103] [104] [Formula A-5] [105] [106] The unit C 1 may include a unit represented by Chemical Formula C 1 -1. [107] [Chemical Formula C 1 -1] [108] [109] In Formula C 1 -1, R is a C 1 to C 10 substituted or unsubstituted linear or branched alkylene group, k1 is an integer of 1 to 10,000, preferably an integer of 1 to 9,000, more preferably It is an integer from 1 to 8,000. [110] For another example, in Formula C 1 -1, [111] Each of R may be independently -CH 2 CH 2 -or -CHCH 3 CH 2 -. [112] [113] For example, according to an embodiment of the present invention, the oligomer forming a polymer network may be at least one compound selected from the group consisting of the following Formulas 1-1 to 1-5. [114] [Formula 1-1] [115] [116] In Formula 1-1, n1 is 1 to 10,000, [117] [Formula 1-2] [118] [119] In Formula 1-2, n2 is 1 to 10,000, [120] [Formula 1-3] [121] [122] In Formula 1-3, n3 is 1 to 10,000, [123] [Formula 1-4] [124] [125] In Formula 1-4, n4 is 1 to 10,000, [126] [Formula 1-5] [127] [128] In Formula 1-5, n5 is 1 to 10,000. [129] In Formulas 1-1 to 1-5, n1 to n5 are each independently an integer of 1 to 10,000, preferably an integer of 1 to 9,000, and more preferably an integer of 1 to 8,000. [130] Meanwhile, the gel polymer electrolyte is preferably formed by injecting a composition for a gel polymer electrolyte containing the oligomer into a battery case and then curing it. [131] More specifically, the secondary battery according to the present invention includes the steps of (a) inserting an electrode assembly consisting of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode into a battery case, and (b) the battery It can be prepared by injecting the composition for a gel polymer electrolyte according to the present invention into a case and then polymerizing it to form a gel polymer electrolyte. [132] In this case, the polymerization reaction is possible through thermal polymerization, E-BEAM, gamma ray, and room temperature/high temperature aging process. [133] [134] In addition, as the battery case, various battery cases used in the art may be used without limitation, and for example, a cylindrical, rectangular, pouch type, or coin type battery case may be used. [135] [136] Meanwhile, the composition for a gel polymer electrolyte may include a lithium salt, a non-aqueous organic solvent, and a polymerization initiator in addition to the oligomer. [137] As the lithium salt, those commonly used in an electrolyte for a lithium secondary battery may be used without limitation. For example, as the cation Li + and include, as an anion F - , Cl - , Br - , I - , NO 3 - , N (CN) 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - , SbF 6 - , AsF 6 - , BF 2 C 2 O 4 -, BC 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , (CF 3 SO 2 ) 2 N - , (F 2 SO 2 ) 2 N - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH - , CF 3 (CF 2 ) 7SO 3 - , CF 3 CO 2 - , CH 3 CO 2 - , SCN - , and (CF 3 CF 2 SO 2 ) 2 N - can include at least one selected from the group consisting of. The lithium salt may be used alone or in combination of two or more as necessary. The lithium salt may be appropriately changed within a range that is usually usable, but in order to obtain an optimum effect of forming a corrosion-preventing film on the electrode surface, it may be contained in a concentration of 0.8 M to 2 M, specifically 0.8 M to 1.5 M in the electrolyte. have. However, it is not necessarily limited to the above concentration range, and may be included in a high concentration of 2M or more depending on other components in the composition for the gel polymer electrolyte. [138] The non-aqueous organic solvent may be used without limitation, those commonly used in an electrolyte solution for a lithium secondary battery. For example, an ether compound, an ester compound, an amide compound, a linear carbonate compound, or a cyclic carbonate compound may be used alone or in combination of two or more. Among them, representatively, a cyclic carbonate compound, a linear carbonate compound, or a mixture thereof may be included. [139] Specific examples of the cyclic carbonate compound include ethylene carbonate (EC), propylene carbonate (PC), 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, vinylene carbonate, and fluoroethylene carbonate (FEC). In addition, specific examples of the linear carbonate compound include the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate, ethylmethyl carbonate (EMC), methylpropyl carbonate, and ethylpropyl carbonate. Any one selected from or a mixture of two or more of them may be representatively used, but is not limited thereto. [140] In particular, among the carbonate-based organic solvents, cyclic carbonates such as ethylene carbonate and propylene carbonate, which are known to dissociate lithium salts in the electrolyte well due to high dielectric constant as an organic solvent of high viscosity, may be used. In addition to these cyclic carbonates, dimethyl carbonate and diethyl When a low viscosity, low dielectric constant linear carbonate such as carbonate is mixed in an appropriate ratio and used, an electrolyte solution having a high electrical conductivity can be prepared. [141] In addition, as the ether compound in the non-aqueous organic solvent, any one selected from the group consisting of dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, methylpropyl ether, and ethylpropyl ether, or a mixture of two or more thereof It can be used, but is not limited thereto. [142] And as the ester compound in the non-aqueous organic solvent, linear esters such as methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, and butyl propionate; And any one selected from the group consisting of cyclic esters such as γ-butyrolactone, γ-valerolactone, γ-caprolactone, σ-valerolactone, and ε-caprolactone, or a mixture of two or more thereof may be used. However, it is not limited thereto. [143] [144] The polymerization initiator is a compound that is decomposed by heat in a battery, non-limiting example, by heat of 30°C to 100°C, specifically 60°C to 80°C, or decomposed at room temperature (5°C to 30°C) to form a radical. At this time, the formed radical may initiate a free radical reaction with a functional group such as a (meth)acrylate group in the oligomer to form a polymer network through polymerization reaction between the oligomers. As the polymer network is formed, curing by bonding between oligomers proceeds to form a gel polymer electrolyte. [145] The polymerization initiator may be a conventional polymerization initiator known in the art, and may be at least one selected from the group consisting of an azo compound, a peroxide compound, or a mixture thereof. [146] For example, the polymerization initiator, benzoyl peroxide (benzoyl peroxide), acetyl peroxide (acetyl peroxide), dilauryl peroxide (dilauryl peroxide), di-tert-butyl peroxide (di-tert-butyl peroxide), Organic peroxides such as t-butyl peroxy-2-ethyl-hexanoate, cumyl hydroperoxide and hydrogen peroxide or hydro Peroxides and 2,2'-azobis (2-cyanobutane), dimethyl 2,2'-azobis (2-methylpropionate), 2,2'-azobis (methylbutyronitrile), 2 ,2'-azobis (isobutyronitrile) (AIBN; 2,2'-Azobis (iso-butyronitrile)) and 2,2'-azobisdimethyl-valeronitrile (AMVN; 2,2'-Azobisdimethyl- Valeronitrile), but at least one azo compound selected from the group consisting of, but is not limited thereto. [147] The polymerization initiator may contain 0.1% to 5% by weight based on the total weight of the oligomer. When the polymerization initiator is included within the above range, the remaining unreacted polymerization initiator may be minimized, and gelation may be performed at a certain level or higher. [148] According to another embodiment of the present invention, a battery module including the lithium secondary battery as a unit cell and a battery pack including the same are provided. Since the battery module and battery pack includes the lithium secondary battery having high capacity, high rate characteristics, and site characteristics, a medium or large size selected from the group consisting of electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, and power storage systems It can be used as a power source for the device. Mode for carrying out the invention [149] Hereinafter, the present invention will be described in more detail through specific examples. However, the following examples are only examples to aid understanding of the present invention and do not limit the scope of the present invention. It is obvious to those skilled in the art that various changes and modifications are possible within the scope of the present disclosure and the scope of the technical idea, and it is natural that such modifications and modifications belong to the appended claims. [150] [151] [Example] [152] 1. Example 1 [153] (1) Preparation of organic binder [154] In a reactor cooled to -15 °C in a nitrogen atmosphere, vinylidene fluoride (VDF) as a monomer, diisopropyl peroxydicarbonate as a free radical initiator, and 1,1,2-trichloro trifluorine as a solvent Ethane (1,1,2-trichlorotrifluoroethane) was introduced into the reactor. Thereafter, the polymerization reaction was carried out to polymerize the compound (weight average molecular weight: 50,000) in which the unit represented by Formula X-1 was repeated by maintaining the reaction mixture at 45° C. and stirring at 200 rpm to initiate polymerization. Thereafter, after 10 hours passed, NaCl was added to replace Cl at the end of the polymerized compound to terminate the polymerization reaction, and a monomer that did not participate in the polymerization reaction was discharged. [155] After dispersing the polymerized compound in an N-methylpyrrole solvent, acrylic acid relative to the polymerized compound was added at a molar ratio of 1:1.1, maintained at 45°C in the presence of NaOH, and stirred at 200 rpm. Thereafter, after 10 hours, a drying process was performed at 120° C. to obtain an organic binder in which Cl was substituted with an acryloxy group at the terminal. [156] (2) Manufacture of electrodes for lithium secondary batteries [157] 1) anode manufacturing [158] (Li (Ni 0.8 Mn 0.1 Co 0.1 )O 2 ) 97% by weight as a positive electrode active material, 1% by weight of carbon black as a conductive material, 2% by weight of the prepared organic binder as a solvent N-methyl-2- It was added to pyrrolidone (NMP) to prepare a positive electrode active material layer composition. The positive electrode active material layer composition was applied to an aluminum (Al) thin film of a positive electrode current collector having a thickness of about 20 μm, dried, and then roll pressed to prepare a positive electrode. [159] 2) cathode manufacturing [160] 95% by weight of carbon powder as an anode active material, 1% by weight of carboxymethylcellulose (CMC) as a binder, 3% by weight of styrene butadiene rubber (SBR), and 1% by weight of carbon black as a conductive material And added to NMP as a solvent to prepare a negative active material layer composition. The negative active material layer composition was applied to a copper (Cu) thin film of a negative electrode current collector having a thickness of 10 μm, dried, and then roll pressed to prepare a negative electrode. [161] (3) Preparation of gel polymer electrolyte composition [162] Ethylene carbonate (EC): ethyl methyl carbonate (EMC) = 3: 7 (volume ratio) in 94.99 g of an organic solvent in which 1M LiPF 6 is dissolved, 5 g of a compound represented by Formula 1-1 (n1 = 3), dimethyl as a polymerization initiator A gel polymer electrolyte composition was prepared by adding 0.01 g of 2,2'-azobis(2-methylpropionate) (CAS No. 2589-57-3). [163] (4) manufacturing lithium secondary battery [164] After preparing an electrode assembly by sequentially stacking the prepared positive electrode, negative electrode, and a separator consisting of three layers of polypropylene/polyethylene/polypropylene (PP/PE/PP), the electrode assembly was housed in a battery case, and the gel After the polymer electrolyte composition was injected, it was stored at room temperature for 2 days and then heated at 65° C. for 5 hours (thermal polymerization) to prepare a lithium secondary battery. [165] [166] 2. Example 2 [167] As monomers in a reactor cooled to -15 °C under a nitrogen atmosphere, vinylidene fluoride (VDF) and hexafluoropropylene (HFP, hexafluoropropylene) were mixed in a 7:3 weight ratio and used as a free radical initiator. Oxydicarbonate (diisopropyl peroxydicarbonate) was used, and 1,1,2-trichlorotrifluoroethane was introduced into the reactor as a solvent. Thereafter, a polymerization reaction was performed to polymerize the polymerized compound (weight average molecular weight: 100,000) such that the unit represented by Formula X-2 was repeated by maintaining the reaction mixture at 45° C. and stirring at 200 rpm to initiate polymerization. After 10 hours, NaCl was added to replace Cl at the end of the polymerized compound to terminate the polymerization reaction, and a monomer that did not participate in the polymerization reaction was discharged. [168] After dispersing the polymerized compound in an N-methylpyrrole solvent, acrylic acid relative to the polymerized compound was added at a molar ratio of 1:1.1, maintained at 45°C in the presence of NaOH, and stirred at 200 rpm. Thereafter, after 10 hours, a drying process was performed at 120° C. to obtain an organic binder in which Cl was substituted with an acryloxy group at the terminal. [169] Thereafter, an electrode for a lithium secondary battery and a lithium secondary battery were manufactured in the same manner as in Example 1, except that the organic binder prepared according to Example 2 was used. [170] [171] [Comparative Example] [172] 1. Comparative Example 1 [173] In Example 1, an electrode for a lithium secondary battery and a lithium secondary battery were manufactured in the same manner except that polyvinylidene fluoride (PVDF) was used instead of an organic binder. [174] [175] [Experimental Example] [176] 1. Experimental Example 1: Initial dose measurement [177] For each of the lithium secondary batteries prepared in Examples 1 and 2 and the lithium secondary battery prepared in Comparative Example 1, formation was performed at a current of 100 mA (0.1 C rate), and then 4.2 V 333 mA (0.3 C, 0.05 C cut-off) When the CC/CV charging and 3 V 333 mA (0.3 C) CC discharge were repeated three times, the capacity of the lithium secondary battery measured in the third discharged state was selected as the initial capacity. The results are shown in Table 1 and FIG. 1. [178] [Table 1] Initial capacity (mAh) Example 1 2.01 Example 2 2.00 Comparative Example 1 1.96 [179] Looking at Table 1, it is confirmed that the lithium secondary batteries of Examples 1 and 2 have a relatively higher initial capacity than the lithium secondary batteries of Comparative Example 1. It is believed that this is because, in the case of Examples 1 and 2, a more uniform and stable gel polymer electrolyte is formed on the electrode surface, thereby reducing the interface resistance. [180] [181] 2. Experimental Example 2: Room temperature lifetime evaluation [182] For each of the lithium secondary batteries prepared in Examples 1 and 2 and the lithium secondary battery prepared in Comparative Example 1, formation was performed at a current of 100 mA (0.1 C rate), and then 4.2 V 333 mA (0.3 C, 0.05 C cut-off) When CC/CV charging and 3 V 333 mA (0.3 C) CC discharge were repeated 100 times, the capacity and initial formation of the lithium secondary battery at the 100th discharged state were performed, and then 4.2 V 333 mA (0.3 C , 0.05 C cut-off) After charging once with CC/CV, the capacity retention rate was calculated by comparing the capacity of the lithium secondary battery in a state where 3 V 333 mA (0.3 C) CC was discharged once. The results are shown in Table 2. [183] [Table 2] Capacity retention rate (%) Example 1 95 Example 2 96 Comparative Example 1 92 [184] Referring to Table 2, it was confirmed that the lithium secondary batteries of Examples 1 and 2 had a higher capacity retention rate than the lithium secondary batteries of Comparative Example 1. This is believed to be because, in the case of the lithium secondary batteries according to Examples 1 and 2, the gel polymer electrolyte was stably and uniformly formed on the electrode surface, thereby suppressing the occurrence of an electrolyte degradation reaction on the electrode surface. [185] [186] 3. Experimental Example 3: High temperature safety evaluation [187] For each lithium secondary battery prepared in Examples 1 and 2 and Comparative Example 1, a hot box test (HOT box test; SOC (State Of Charge) 100%), which is an evaluation index for confirming the high-temperature durability, was used. The experiment was carried out by allowing it to stand at 150° C. (heating rate 5° C./min) for 4 hours to check the presence or absence of ignition. The results are shown in Table 3 and FIG. 2 below. [188] [Table 3] Fire or not Ignition start time (minutes) Example 1 X - Example 2 O 180 Comparative Example 1 O 10 [189] In Table 3, X represents a case where no ignition occurs during storage at 150°C, and O represents a case where ignition occurs during storage at 150°C. [190] Referring to Table 3 and FIG. 2, it can be seen that the rechargeable lithium battery of Example 1 has excellent electrode interface stability even when stored at a high temperature in a fully charged state, so that exothermic reactions and thermal runaway are suppressed and thus not ignited. Although the lithium secondary battery of Example 2 ignited, the ignition was delayed for more than 180 minutes, it can be seen that the high-temperature safety is relatively superior to that of Comparative Example 1, which ignited in 10 minutes. [191] [192] [193] Claims [Claim 1] Electrode current collector; And an electrode active material layer formed on one surface of the electrode current collector and including an electrode active material and an organic binder including an ethylenically unsaturated group. [Claim 2] The electrode for a lithium secondary battery according to claim 1, wherein the ethylenically unsaturated group is at least one selected from the group consisting of a vinyl group, an acryloxy group, and a methacryloxy group. [Claim 3] The electrode for a lithium secondary battery according to claim 1, wherein the organic binder is contained in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of the electrode active material layer. [Claim 4] The electrode for a rechargeable lithium battery according to claim 1; And a gel polymer electrolyte comprising a polymer network in which oligomers including (meth)acrylate groups are bonded in a three-dimensional structure. [Claim 5] The lithium secondary battery according to claim 4, wherein the oligomer further comprises an oxyalkylene group. [Claim 6] The lithium secondary battery of claim 4, wherein the oligomer is represented by the following Formula 1: [Formula 1] In Formula 1, A and A'each independently contain at least one (meth)acrylate group It is a unit, and C 1 is a unit containing an oxyalkylene group. [Claim 7] The lithium secondary battery of claim 4, wherein the oligomer comprises at least one selected from compounds represented by the following Formulas 1-1 to 1-5: [Formula 1-1] The n1 in Formula 1-1 Is 1 to 10,000, [Formula 1-2] In Formula 1-2, n2 is 1 to 10,000, [Formula 1-3] In Formula 1-3, n3 is 1 to 10,000, [Formula 1- 4] In Formula 1-4, n4 is 1 to 10,000, and [Chemical Formula 1-5] In Formula 1-5, n5 is 1 to 10,000. [Claim 8] The lithium secondary battery according to claim 4, wherein the gel polymer electrolyte is formed by injecting a composition for a gel polymer electrolyte containing the oligomer into a battery case and then curing it.