Title of Invention: Binder for lithium secondary battery negative electrode and negative electrode for lithium secondary battery comprising same technical field [One] It relates to a binder for a negative electrode of a lithium secondary battery and a negative electrode for a lithium secondary battery comprising the same. [2] This application is an application claiming priority to Korean Patent Application No. 10-2019-0116992 filed on September 23, 2019, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference. background [3] 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 exhibiting high energy density and operating potential, long cycle life, and low self-discharge rate Batteries have been commercialized and widely used. [4] The electrode of a lithium secondary battery is manufactured by mixing a positive electrode active material or a negative electrode active material and a binder resin component and dispersing it in a solvent to make a slurry, applying this to the surface of the electrode current collector, drying it, and forming a mixture layer. [5] The binder is used to secure adhesion or binding force between the active material and the active material and between the active material and the electrode current collector, but an excessive amount of the binder is required to improve the adhesion between the electrode current collector and the active material. However, excess binder has a problem of lowering the capacity and conductivity of the electrode. On the other hand, insufficient adhesive force causes electrode peeling in processes such as electrode drying and pressing, thereby increasing the electrode defect rate. In addition, the electrode having low adhesion may be peeled off by an external impact, and this electrode peeling increases the contact resistance between the electrode material and the current collector, which may cause deterioration of electrode output performance. [6] In particular, during charging and discharging of a lithium secondary battery, the volume of the negative active material changes due to the reaction with lithium. As a result, as the charge/discharge cycle progresses, the capacity is rapidly reduced, and thus the cycle life is shortened. In addition, when a compound such as silicon, tin, or a silicon-tin alloy is used to increase the discharge capacity, since silicon, tin, etc. cause a larger volume change by reaction with lithium, this problem is more pronounced will lose [7] On the other hand, styrene-butadiene rubber and carboxymethyl cellulose, also called water-based binders because they can be dissolved in water, are environmentally friendly and have the advantage of providing strong adhesion, while in order to satisfy both dispersibility and adhesion, only styrene-butadiene rubber or carboxymethyl cellulose is used. Since it is difficult to use, it has disadvantages in terms of process and cost because it is necessary to use both styrene-butadiene rubber and carboxymethyl cellulose as a two-component binder. [8] Accordingly, a binder for a negative electrode of a lithium secondary battery that can be well dispersed in the electrode mixture composition, in particular, the negative electrode mixture composition, can improve adhesion between the electrode components, and simplify the process procedure while allowing the electrode to have superior tensile strength and an electrode for a lithium secondary battery including the same. DETAILED DESCRIPTION OF THE INVENTION technical challenge [9] An object to be solved by the present invention is to provide a binder for a negative electrode of a lithium secondary battery that can be well dispersed in a negative electrode mixture composition, can improve adhesion among negative electrode components, and allow the negative electrode to have superior tensile strength. [10] An object to be solved by the present invention is to provide a binder for a negative electrode of a one-component lithium secondary battery that can be well dispersed in a negative electrode mixture composition, can improve adhesion among negative electrode components, and allow the negative electrode to have superior tensile strength. [11] Another object of the present invention to be solved is to provide a negative electrode for a lithium secondary battery comprising the binder for the negative electrode of the lithium secondary battery. [12] Another object of the present invention to be solved is to provide a lithium secondary battery including the negative electrode for the lithium secondary battery. means of solving the problem [13] According to one aspect of the present invention, in a first aspect, a copolymer comprising a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer and a repeating unit derived from an acrylonitrile monomer, There is provided a binder for a negative electrode of a lithium secondary battery, characterized in that the total weight of the repeating unit derived from the acrylic acid monomer and the repeating unit derived from the sodium acrylate monomer in the copolymer is 25 to 35% by weight. [14] [15] According to the second aspect of the present invention, in the first aspect, the copolymer comprises only a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer. A binder for a negative electrode of a lithium secondary battery is provided. [16] According to the third aspect of the present invention, in the first aspect or the second aspect, the copolymer is 60 to 65% by weight of repeating units derived from acrylamide monomer, 5 to 10% by weight of repeating units derived from acrylic acid monomer, and repeating units derived from sodium acrylate monomer There is provided a binder for a negative electrode of a lithium secondary battery, characterized in that it is a copolymer consisting of 15 to 25% by weight of units and 5 to 15% by weight of repeating units derived from acrylonitrile monomers. [17] According to a fourth aspect of the present invention, in any one of the first to third aspects, there is provided a binder for a negative electrode of a lithium secondary battery, characterized in that the binder for the negative electrode of a lithium secondary battery is in the form of particles. [18] According to another aspect of the present invention, in a fifth aspect of the present invention, a negative electrode active material, a conductive material and a binder are included, wherein the binder is a binder for a lithium secondary battery negative electrode according to any one of the first to fourth aspects. And, there is provided a negative electrode for a lithium secondary battery, characterized in that the negative electrode active material is a silicon-based negative electrode active material. [19] According to a sixth aspect of the present invention, in the fifth aspect, in the copolymer, the acrylamide monomer-derived repeating unit is positioned in a direction toward the surface of the negative active material particle, and the acrylonitrile monomer-derived repeating unit is the surface of the negative active material particle and An anode for a lithium secondary battery is provided, characterized in that it is positioned in the opposite direction. [20] According to a seventh aspect of the present invention, in the fifth or sixth aspect, there is provided a negative electrode for a lithium secondary battery, wherein the negative active material is a Si or SiO-based active material. [21] According to an eighth aspect of the present invention, in any one of the fifth to seventh aspects, there is provided a negative electrode for a lithium secondary battery, characterized in that the negative electrode for a lithium secondary battery has a tensile strength in the range of 80 to 120 MPa do. [22] According to a ninth aspect of the present invention, in any one of the fifth to eighth aspects, the anode for a lithium secondary battery has an adhesive force in the range of 15 gf/15mm to 100 gf/15mm. A negative electrode for a battery is provided. [23] According to a tenth aspect of the present invention, there is provided a lithium secondary battery comprising the negative electrode for a lithium secondary battery according to any one of the fifth to ninth aspects. Effects of the Invention [24] The binder for a negative electrode for a lithium secondary battery according to the present invention can be excellently dispersed in the negative electrode mixture composition used for manufacturing the negative electrode for lithium secondary batteries, that is, the negative electrode mixture composition prepared by including an active material, a binder and a conductive material as main components there is. In particular, the binder for a negative electrode of a lithium secondary battery according to the present invention can be appropriately located at the contact point between the active material, between the active material and the conductive material, and between the active material and the current collector, thereby contributing to having a strong binding relationship between the negative electrode components. do. [25] The binder for a negative electrode of a lithium secondary battery according to the present invention contains a component that provides a strong hydrogen bond among components constituting the binder, so that it can be uniformly dispersed in an aqueous dispersion medium. [26] The binder for a negative electrode of a lithium secondary battery according to the present invention has a synergistic effect with strong adhesion and excellent dispersibility, so that the negative active material with large volume expansion during charging and discharging, for example, Si, SiO-based negative active material, is separated during charging and discharging. phenomenon can be remarkably reduced. [27] In the negative electrode for a lithium secondary battery according to the present invention, main components, that is, an active material, a binder and a conductive material are uniformly dispersed throughout the negative electrode active material layer. In particular, in the negative electrode for a lithium secondary battery according to the present invention, the binder according to the present invention can be appropriately positioned at the contact point between the active material, between the active material and the conductive material, and between the active material and the current collector, so that the negative electrode components are strongly bound to each other can have a relationship. [28] In addition, the negative electrode for a lithium secondary battery according to the present invention contains a strong hydrogen bond in the binder, and the binder is excellently and uniformly dispersed in an aqueous dispersion medium. When used together with a SiO-based negative active material, it has the effect of remarkably reducing the conventional problems during charging and discharging, that is, the separation of Si and SiO-based negative active materials from contact between constituents. [29] In addition, the lithium secondary battery including the electrode according to the present invention exhibits excellent capacity retention. Brief description of the drawing [30] 1 is a graph measuring the peel strength of a negative electrode according to the present invention. [31] Figure 2 is a graph measuring the tensile strength of the binder film according to the present invention. [32] 3 is a graph measuring the dispersibility of the negative electrode mixture composition according to the present invention. [33] 4 is a graph of measuring the capacity retention rate of the lithium secondary battery including the negative electrode according to Example 1 and Comparative Example 1, respectively. Modes for carrying out the invention [34] Hereinafter, the present invention will be described in detail with reference to the drawings. [35] The terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. Based on the principle that there is, it should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention. [36] According to an aspect of the present invention, a copolymer comprising a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer, among the copolymers, is an acrylic acid monomer. There is provided a binder for a negative electrode of a lithium secondary battery in which the total weight of the repeating unit derived from the sodium acrylate monomer and the repeating unit derived from the sodium acrylate monomer is 25 to 35% by weight. [37] In particular, the binder for a negative electrode of a lithium secondary battery according to the present invention includes a copolymer including a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer, but styrene It is characterized in that it does not contain butadiene rubber or carboxymethyl cellulose. [38] In a specific embodiment of the present invention, the binder for a negative electrode of a lithium secondary battery is a copolymer substantially composed of a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer. characterized in that [39] In the present specification, "substantially consisting of" is intended to encompass a case where a small amount of additives or unintentional trace impurities are included, and the additives or impurities are the intended effect of the binder for a negative electrode of a lithium secondary battery according to the present invention. It should not have any significant effect. [40] In a specific embodiment of the present invention, the binder for the negative electrode of a lithium secondary battery is a copolymer consisting only of a repeating unit derived from acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer. do it with [41] According to a specific embodiment of the present invention, the binder for the negative electrode of the lithium secondary battery includes 60 to 65% by weight of repeating units derived from acrylamide monomer, 5 to 10% by weight of repeating units derived from acrylic acid monomer, and 15 to 25% by weight of repeating units derived from sodium acrylate monomer. It is a copolymer consisting of 5 to 15% by weight of a repeating unit derived from an acrylonitrile monomer and an acrylonitrile monomer. [42] In a specific embodiment of the present invention, when the acrylamide monomer-derived repeating unit is included in an amount of 60 to 65% by weight in the copolymer, the acrylamide monomer-derived repeating unit is included in less than 60% by weight in the copolymer. A problem in that the anode adhesive strength cannot be improved to a desired level, and the acrylamide monomer-derived repeating unit is contained in more than 65 wt% of the copolymer, so the anode, more specifically, the anode active material layer has very brittle physical properties and loses flexibility problems can be avoided. [43] In the present specification, the 'brittle' characteristic of the negative electrode means that the negative electrode formed after the negative electrode mixture composition is coated and dried on the negative electrode current collector is not flexible but very hardened. When such a negative electrode undergoes a roll-to-roll rolling process in its manufacturing process, cracks are generated in the negative electrode, more specifically, in the negative electrode active material layer, making it difficult to manufacture the negative electrode. [44] In a specific embodiment of the present invention, when the repeating unit derived from the acrylic acid monomer is included in the copolymer in an amount of 5 to 10% by weight, the repeating unit derived from the acrylic acid monomer is included in less than 5% by weight in the copolymer, so that the negative electrode The problem that the mixture composition exhibits poor dispersibility during stirring, and the negative electrode, more specifically, the negative electrode active material layer has very brittle physical properties because it contains more than 10% by weight of repeating units derived from acrylic acid monomer, and loses flexibility. can be prevented. [45] In a specific embodiment of the present invention, when the repeating unit derived from sodium acrylate monomer is included in the copolymer in an amount of 15 to 25% by weight, the repeating unit derived from sodium acrylate monomer is included in less than 15% by weight in the copolymer. As a result, the dispersibility of the negative electrode mixture composition cannot be significantly improved, and the repeating unit derived from sodium acrylate monomer is included in an amount greater than 25% by weight, so that many bubbles are generated during stirring of the negative electrode mixture composition, and the generated bubbles are not In this case, the conductive materials agglomerate and the active materials agglomerate, thereby preventing the problem of deterioration of dispersibility. [46] In a specific embodiment of the present invention, the repeating unit derived from the acrylonitrile monomer is a component that is included in the copolymer to exhibit hydrophobic properties, and when included in an amount of 5 to 15% by weight in the copolymer, the acrylonitrile Since the monomer-derived repeating unit is contained in less than 5% by weight, the finally manufactured negative electrode has a high affinity for moisture, as a result, the negative electrode contains a lot of moisture, and the acrylonitrile monomer-derived repeating unit is 15% by weight % to reduce the surface tension of the copolymer to increase the probability of contact with air, and as a result, it is possible to prevent the problem of generating a lot of bubbles in the step of stirring for mixing after the negative electrode component is added to the dispersion medium. can [47] According to the present invention, in the copolymer, the total weight of the repeating unit derived from the acrylic acid monomer and the repeating unit derived from the sodium acrylate monomer accounts for 25 to 35% by weight. If the total weight of the repeating unit derived from the acrylic acid monomer and the repeating unit derived from the sodium acrylate monomer is less than 25% by weight, uniform dispersion does not occur while stirring the negative electrode mixture composition, and aggregation of particles occurs, and more than 35% by weight In many cases, a lot of bubbles are generated during stirring, and the negative electrode produced by using this copolymer as a binder for the negative electrode of a lithium secondary battery exhibits brittle physical properties. [48] The binder for the lithium secondary battery negative electrode contains a copolymer derived from a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer in the dispersion medium in the form of particles, Among the functional groups in the monomer, hydrogen bonding occurs between the OH-O, OH-N, NH-O, and NH-N functional groups, and the -NH 2 , -OH, -CONH 2 functional groups have large aggregate energy, so binder particles is positioned at a contact position between the active material particles. [49] In a specific embodiment of the present invention, the copolymer is active material particles and/or conductive material particles such that the repeating unit derived from acrylamide (PAM) monomer in the negative electrode mixture composition is positioned toward the surface of the active material particles and/or conductive material particles. is attached to These acrylamide monomer-derived repeating units are positioned in the direction toward the surface of the active material particles even after the negative electrode is formed from the negative electrode mixture composition and are attached to the surface of the active material particles. [50] In a specific embodiment of the present invention, in the negative electrode mixture composition, the repeating unit derived from acrylic acid (PAA) monomer and the repeating unit derived from sodium acrylate (PAA-Na+) monomer in the negative electrode mixture composition are opposite to the direction in which they are attached to the conductive material particles or active material particles located in the direction While the repeating unit derived from the acrylonitrile monomer is located in the opposite direction to the direction in which it is attached to the conductive material particles and/or the active material particles, the probability of meeting with air is reduced due to the hydrophobic property, thereby preventing the bubble from being trapped into the binder. do. [51] In a specific embodiment of the present invention, the repeating unit derived from the acrylamide monomer used in the copolymer may have a weight average molecular weight in the range of 4 x 10 6 to 7 x 10 6 . When a repeating unit derived from an acrylamide monomer having a weight average molecular weight smaller than the lower limit is used, the negative electrode finally manufactured by using the copolymer as a binder for a negative electrode for a lithium secondary battery exhibits deteriorated adhesion, and a weight average molecular weight greater than the upper limit When a repeating unit derived from acrylamide monomer is used, the anode finally manufactured by using the copolymer as a binder for a negative electrode of a lithium secondary battery exhibits brittle physical properties. [52] In a specific embodiment of the present invention, the repeating unit derived from the acrylic acid monomer used in the copolymer may have a weight average molecular weight in the range of 1 x 10 5 to 6 x 10 5 . When a repeating unit derived from an acrylic acid monomer having a weight average molecular weight smaller than the lower limit is used, it is difficult to uniformly disperse the copolymer with an active material and a conductive material while stirring by using the copolymer as a binder for a negative electrode for a lithium secondary battery, and higher than the upper limit When a repeating unit derived from an acrylic acid monomer having a large weight average molecular weight is used, a lot of bubbles are generated in the stirring step of mixing the negative electrode mixture composition, and the finally produced negative electrode is brittle by using the copolymer as a binder for the negative electrode of a lithium secondary battery. have characteristics. [53] In a specific embodiment of the present invention, the repeating unit derived from the sodium acrylate monomer used in the copolymer may have a weight average molecular weight in the range of 2,000 to 1 x 10 5 . When a repeating unit derived from sodium acrylate monomer having a weight average molecular weight smaller than the lower limit is used, the copolymer is used as a binder for a negative electrode for a lithium secondary battery, and it is difficult to uniformly disperse the active material and the conductive material during stirring, and the upper limit is higher than the upper limit. When a repeating unit derived from sodium acrylate monomer having a large weight average molecular weight is used, many bubbles are generated in the stirring step of mixing the negative electrode mixture composition using the copolymer as a binder for the negative electrode of a lithium secondary battery, and the copolymer is used as a lithium secondary battery The anode active material layer finally produced by using it as a binder for the anode has brittle properties. [54] In a specific embodiment of the present invention, the polyacrylonitrile used in the copolymer may have a weight average molecular weight in the range of 1 x 10 4 to 1 x 10 5 . When a repeating unit derived from an acrylonitrile monomer having a weight average molecular weight smaller than the lower limit is used, the probability of contact between the negative electrode mixture composition and air increases in the stirring step of mixing the negative electrode mixture composition using the copolymer as a binder for a negative electrode for a lithium secondary battery. A lot of bubbles are generated, and the moisture adsorption property of the finally produced negative electrode is increased. When a repeating unit derived from an acrylonitrile monomer having a weight average molecular weight greater than the upper limit is used, the viscosity of the negative electrode mixture composition using the copolymer as a binder for a negative electrode for a lithium secondary battery increases, making it difficult to stir the negative electrode mixture composition. [55] In a specific embodiment of the present invention, the binder for a negative electrode of a lithium secondary battery made of the copolymer has a particle shape, and may have an average particle diameter (D50) of 100 nm to 1 μm or 300 nm to 500 nm. D50 is a particle diameter at 50% of the cumulative distribution of the number of particles according to the particle diameter, and the D50 may be measured using a laser diffraction method. Specifically, after dispersing the powder to be measured in the dispersion medium, it is introduced into a commercially available laser diffraction particle size measuring device (eg, Microtrac S3500) to measure the difference in diffraction pattern depending on the particle size when the particles pass through the laser beam to measure the particle size distribution to calculate D50 can be measured by calculating the particle diameter at the point used as 50% of the particle number cumulative distribution according to the particle diameter in a measuring apparatus. [56] When the binder for the negative electrode of the lithium secondary battery has the above-described average particle diameter (D50), it is possible to exhibit appropriate adhesion, the electrolyte swelling phenomenon is small, and exhibits appropriate elasticity to accommodate the change in the thickness of the negative electrode and reduce the gas generation phenomenon. can be reduced [57] According to a specific embodiment of the present invention, water, acetone, ethanol, or a mixture of two or more thereof is used as a dispersion medium in which the binder for the negative electrode of the lithium secondary battery is dispersed. [58] In a specific embodiment of the present invention, the binder for the negative electrode of the lithium secondary battery may have a viscosity in the range of 10000 mPa·s to 25000 mPa·s at a shear rate of 1 1/s at 25° C., such a viscosity In the case of having a range, a dispersion effect may be exhibited in the stirring step of mixing the negative electrode mixture composition. The viscosity is a value obtained by measuring rheological properties at 25° C. using a TA instrument Trios. [59] The binder for a negative electrode of a lithium secondary battery according to the present invention is a binder for a negative electrode of a one-component lithium secondary battery that has excellent dispersibility and can be stored in one container until just before use. In addition, the binder for a negative electrode of a lithium secondary battery according to the present invention has excellent dispersibility so that uniform dispersion between the active material and the conductive material occurs. [60] The dispersibility of the binder for a negative electrode of a lithium secondary battery may be evaluated in two aspects, namely, a filter test item and a viscosity aspect. [61] First, when evaluating the dispersibility of the binder for a negative electrode of a lithium secondary battery as a filter test item, 17.14 g of a binder for a negative electrode for a lithium secondary battery is added to 300 ml of a dispersion medium at room temperature to prepare 300 ml of a binder dispersion, and then the active material: conductive material: Binder = 70:10:20 Homodisper (Primix) was stirred at 2000rpm. The stirred electrode mixture composition was filtered through a 100 mesh sieve, and the material filtered through the sieve was visually confirmed. If larger particles remain on the mesh sieve among the agglomerates without dispersing the active material and binder, the dispersibility is evaluated as poor. [62] When evaluating the dispersibility of the binder for the negative electrode of a lithium secondary battery in terms of viscosity, the negative electrode mixture prepared by measuring the shear rheological properties (shear rate) at room temperature Active material: conductive material: binder = 70: 10: 20 composition Put 10 mL of the composition into a rheological property measuring instrument (TA instrument Trios) and measure the shear rate according to the shear rate from 0.01 to 1000 1/s at a shear rate of 25°C. When it has a viscosity of 500 to 10000 mPa.s at a shear rate of 1 1/s, it can be evaluated as having desirable dispersibility in terms of processing, particularly, in terms of stirring. If the viscosity is less than 500 mPa.s, the coating is not properly coated, which may cause a problem in the coating process. can [63] According to a specific embodiment of the present invention, the binder for a lithium secondary battery negative electrode according to the present invention may be prepared by a method including the following steps (S1) to (S4), but is not limited thereto. [64] (S1) An acrylonitrile polymer is prepared. To this end, acrylonitrile and an organic solvent for polymer synthesis are mixed, photopolymerized in an ice bath, and freeze-dried to obtain polyacrylonitrile (PAN). In this case, bromoform may be used as an organic solvent for polymer synthesis. Acrylonitrile and the organic solvent for polymer synthesis may be mixed in a volume ratio of 1.5:1 to 2:1. [65] (S2) Polyacrylonitrile obtained above is polymerized with acrylic acid to prepare a copolymer thereof. For this purpose, they are mixed in an organic solvent for polymer synthesis, photopolymerized for 45 to 90 minutes, and freeze-dried. The organic solvent for polymer synthesis may be a mixture of benzene and bromoform. Thus, a polyacrylonitrile-polyacrylic acid copolymer (PAN-PAA) is obtained. [66] (S3) After that, PAN-PAA and methyl acrylate are dissolved in benzene and stirred, benzoyl peroxide is put as an initiator, 1-butanethiol is put as a reactant, nitrogen Raise the temperature to 110 °C in the atmosphere, and after 4 hours of reaction time, the initiator and the monomer are washed with methanol. The obtained powder particles are added to an excess of n-hexane, and an excess of NaOH solution is added to replace the methyl of methyl acrylate with Na cations, and the obtained powder particles are dried. Instead of the Na cation, an excess of KOH or an excess of LiOH may be used in place of the excess of NaOH so that a metal cation such as a Li cation or a K cation displaces the methyl of the methyl acrylate. [67] (S4) PAN-PAA-PAA Na+ copolymer is added to an organic solvent for polymer synthesis, acrylamide is added thereto under anaerobic conditions, and photopolymerized in a closed environment. The photopolymerization temperature may be in the range of 25 to 35 °C, and the photopolymerization time may be in the range of 1.5 to 2.5 hours. Powder particles were obtained as a final product, and the obtained powder particles were freeze-dried. [68] Thereby, a copolymer comprising a repeating unit derived from an acrylamide monomer, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer and a repeating unit derived from an acrylonitrile monomer is obtained. [69] In the above, based on 5 to 15 wt% of the acrylonitrile monomer, 5 to 10 wt% of acrylic acid, 60 to 65 wt% of acrylamide, and 15 to 25 wt% of methyl methacrylate may be used. [70] The binder for a negative electrode of a lithium secondary battery according to the present invention has excellent adhesion and when used in a negative electrode mixture composition, between active materials, between the active material and the conductive material, and also between the active material and the current collector, it can be appropriately located at the contact point, the negative electrode It helps to have a strong bonding relationship between the constituents. [71] In a specific embodiment of the present invention, the binder for a negative electrode of a lithium secondary battery has an adhesive force that prevents the finally manufactured negative electrode active material layer from having brittle physical properties, and more specifically, the negative electrode active material layer is 15 gf/15 mm or more or 17 gf It may be to have an adhesive strength of at least /15mm or 20 gf/15mm or more, and the upper limit of the adhesive strength may be 100 gf/15mm. When the negative electrode active material layer including the binder for a negative electrode of a lithium secondary battery according to the present invention has an adhesive strength lower than the lower limit, a problem of desorption of components from the negative electrode occurs and the change in the volume of the active material cannot be controlled, and the adhesive strength higher than the upper limit In the case of having , the finally manufactured anode active material layer exhibits brittle physical properties. [72] The adhesive strength evaluation may be performed as follows: Prepare a dispersion containing 2 wt% of a binder for a negative electrode of a lithium secondary battery and 98 wt% of an active material as a solid content, and using water as a dispersion medium at a concentration of 55 wt% do. Then, the dispersion is coated on the negative electrode current collector at a loading amount of 100 mg/25 cm 2 and dried to prepare a negative electrode having an active material layer, and the negative electrode is punched and sampled with a width of 15 mm. Then, the prepared negative electrode was mounted on UTM (Kipae E&T), and the force when the negative electrode active material layer 130 mm long was detached from the negative electrode current collector at a speed of 300 mm/min and an angle of 180 degrees. [73] The binder for the negative electrode of the lithium secondary battery may allow the finally manufactured negative electrode active material layer to have excellent tensile strength. Preferably, the binder for a negative electrode of a lithium secondary battery according to the present invention may have a tensile strength in the range of 80 to 120 MPa or 90 to 100 MPa. When the binder for a lithium secondary battery negative electrode has a tensile strength in the above-mentioned range, the final negative electrode, more specifically, the negative electrode active material layer satisfies the excellent mechanical strength, and the volume expansion of the negative electrode active material in the final manufactured negative electrode active material layer has a preventive effect. [74] The evaluation of the tensile strength may be performed as follows: 2 g of a binder is dispersed in 14.6 g of water as a dispersion medium, and the dispersed composition is coated on a release substrate made of Teflon box to a thickness of 180 μm and dried naturally to form a film; , The film is punched out, and the moisture is removed by vacuum drying at 100° C. for 24 hours. Then, after the moisture-dried film is removed from the release substrate, the film is fixedly installed in a tensile strength measuring machine (hardness tester) at a gage point distance of 65 mm, and the binder film is moved up and down at a speed of 20 mm/min. It is determined by measuring the force at the time of pulling and breaking. [75] According to the present invention, the binder is used together with a silicon-based anode active material as an anode active material, thereby effectively solving the problem of volume expansion of the anode active material during charging and discharging. [76] According to another aspect of the present invention, as a negative electrode for a lithium secondary battery, including a negative electrode active material, a conductive material, and a binder for a negative electrode of a lithium secondary battery, the binder for a negative electrode of a lithium secondary battery is, as described above, the binder is derived from an acrylamide monomer A copolymer comprising a repeating unit, a repeating unit derived from an acrylic acid monomer, a repeating unit derived from a sodium acrylate monomer, and a repeating unit derived from an acrylonitrile monomer, among the copolymer, a repeating unit derived from an acrylic acid monomer and a repeating unit derived from a sodium acrylate monomer. A negative electrode for a lithium secondary battery in which the weight is 25 to 35% by weight, and the negative active material is a silicon-based negative active material is provided. [77] In a specific embodiment of the present invention, the silicon-based negative active material includes, for example, Si, silicon oxide particles (SiO x , 0