KR101722981B1 - Binder for Secondary Battery Exhibiting Excellent Adhesive Force - Google Patents

Abstract

The present invention relates to a composition for the production of a binder for an electrode of a secondary battery, which comprises a monomer containing an oxazoline group; A monomer having a carboxylic acid group capable of binding to the oxazoline group by a chemical reaction; At least one monomer selected from the group consisting of (meth) acrylic acid ester monomers and butadiene monomers; And a styrene-based monomer. The present invention also relates to a binder for an electrode of a secondary battery.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a binder for a secondary battery,

The present invention relates to a binder for a secondary battery excellent in adhesion.

Due to the rapid increase in the use of fossil fuels, the demand for the use of alternative energy or clean energy is increasing. As a part of this, the most active field of research is electric power generation and storage.

At present, a typical example of an electrochemical device utilizing such electrochemical energy is a secondary battery, and the use area thereof is gradually increasing.

2. Description of the Related Art [0002] Recently, as technology development and demand for portable devices such as portable computers, portable phones, and cameras have increased, the demand for secondary batteries as energy sources has increased sharply. Among such secondary batteries, they exhibit high energy density and operating potential, Many studies have been made on a lithium secondary battery having a long self discharge rate, and it has been commercialized and widely used.

In addition, as the interest in environmental problems grows, researches on electric vehicles and hybrid electric vehicles that can replace fossil fuel-based vehicles such as gasoline vehicles and diesel vehicles, which are one of the main causes of air pollution, . Although nickel-metal hydride secondary batteries are mainly used as power sources for such electric vehicles and hybrid electric vehicles, researches using lithium secondary batteries having high energy density and discharge voltage are being actively carried out, and they are in the commercialization stage.

Conventionally, a typical lithium secondary battery uses graphite as a negative electrode active material, charging and discharging proceed while repeating a process in which lithium ions in an anode are inserted into a negative electrode and desorbed. The theoretical capacity of the battery varies depending on the kind of the electrode active material, but the charging and discharging capacities decrease with the progress of the cycle.

This phenomenon is the biggest cause of the separation of the electrode active material or between the electrode active material and the current collector due to the change of the volume of the electrode due to the progress of the charging and discharging of the battery, so that the active material fails to function. In addition, lithium ions inserted into the negative electrode may not be properly discharged during the insertion or desorption, and the active sites of the negative electrode may be reduced. As a result, the charge / discharge capacity and lifetime characteristics of the battery may decrease as the cycle progresses.

Particularly, in the prior art, in order to increase the discharge capacity of a battery, an attempt has been made to replace the active material with a relatively large discharge capacity of the same mass. However, there has been a problem in that the interfacial adhesion between the active material and the binder deteriorates, However, when the load of the active material is increased, the amount of the binder used is increased and the electrode thickness is increased.

For example, when natural graphite having a theoretical discharge capacity of 372 mAh / g is used in combination with a material such as silicon, tin, silicon-tin alloy or the like having a large discharge capacity, the volume expansion of the material remarkably increases Which causes detachment of the negative electrode material or detachment of adhesion to the current collector. As a result, there is a problem that the capacity of the battery is rapidly deteriorated as the battery is repeatedly cycled.

Therefore, it is possible to exhibit a strong coupling force even in a small amount, to prevent an increase in electrode thickness, to prevent separation between the electrode active material or between the electrode active material and the current collector, and to control the volume expansion of the electrode active material There is a high need for developing a binder capable of improving the structural stability of the electrode and thereby improving the performance of the battery.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

Specifically, it is an object of the present invention to provide a non-aqueous electrolyte secondary battery which exhibits a strong coupling force even in a small amount to prevent electrode thickness from increasing during electrode production, prevents separation between electrode active materials or between electrode active material and current collector, And to provide a composition for a binder which can improve the structural stability of the electrode and thereby improve the performance of the battery by controlling the volume expansion of the electrode active material.

In order to achieve the above object, a binder for an electrode of a secondary battery according to the present invention comprises a polymer of the following monomers, wherein the monomers include a monomer including an oxazoline group; A monomer having a carboxylic acid group capable of binding to the oxazoline group by a chemical reaction; At least one monomer selected from the group consisting of (meth) acrylic acid ester monomers and butadiene monomers; And a styrene-based monomer.

Herein, the oxazoline group and the carboxylic acid group can be strongly bonded by a chemical reaction. When the binder containing the oxazoline group and the monomer containing a carboxylic acid group is polymerized to prepare a binder, A binder exhibiting a stronger bonding force than the binders can be produced.

The monomers containing oxazoline groups are thermally crosslinked and have an advantage of easily controlling the crosslinking density. The monomers containing the carboxylic acid groups increase the adhesion between the current collector and the electrode material and improve the dispersion stability of the electrode slurry for the secondary battery And it is possible to improve the trapping ability of the transition metal ions dissociated from the cathode active material.

In one specific example, the monomer comprising the oxazoline group is selected from the group consisting of 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, Isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2- Ethyl-2-oxazoline, and the like.

The oxazoline group-containing monomer may be contained in an amount of 1 to 10% by weight, more specifically 1 to 8% by weight based on the total weight of the composition, more specifically 2-weight % To 7% by weight. If the content of the monomer containing oxazoline group is less than 1% by weight, it is difficult to prevent the active material from being separated due to weak adhesive force of the binder. On the other hand, if the content exceeds 10% by weight, Handling can be difficult.

In one specific example, the monomer containing the carboxylic acid group may be an ethylenically unsaturated carboxylic acid monomer, and specifically, for example, the ethylenically unsaturated carboxylic acid monomer may be acrylic acid, methacrylic acid, It may be at least one monomer selected from the group consisting of acid, fumaric acid, and itaconic acid.

The monomer containing the carboxylic acid group may be contained in an amount of 1 to 10% by weight, more specifically 1 to 8% by weight based on the total weight of the composition, more specifically 2% To 7% by weight. When the content of the monomer containing a carboxylic acid group is less than 1% by weight, adhesion of the binder is weak and it is difficult to prevent the active material from being desorbed. On the other hand, if the content exceeds 10% by weight, the viscosity of the electrode slurry becomes excessively high, .

At this time, it is preferable that the content ratios of the monomer containing the oxazoline group and the monomer containing the carboxylic acid group are set to be similar to each other.

In one specific example, the (meth) acrylic acid ester monomer is at least one monomer selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, Propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, n-butyl methacrylate, Methacrylate, isobutyl methacrylate, n-amyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, n-ethylhexyl methacrylate, 2-ethylhexyl methacrylate, Acrylate, methacrylate, acrylate, and hydroxypropyl methacrylate.

Specifically, the (meth) acrylate monomer may be contained in an amount of 5 to 60% by weight based on the total weight of the composition.

In one specific example, the butadiene-based monomer is selected from the group consisting of 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, May be at least one selected from the group consisting of

Specifically, the butadiene-based monomer may be contained in an amount of 5 to 60% by weight based on the total weight of the composition. When the butadiene-based monomer is contained in an amount of less than 5% by weight, flexibility of the electrode may be lowered. When the butadiene-based monomer is used in an amount of more than 60% by weight, flexibility may be excessively high and the holding force between the active material and the active material may become insufficient.

In one specific example, the styrene-based monomer is chemically stable and has low solubility in an electrolyte solution, and when used as a binder of an electrode, the active material can be stabilized. Specifically, the styrenic monomer may be at least one compound selected from the group consisting of styrene,? -Methylstyrene,? -Methylstyrene, p-t-butylstyrene and divinylbenzene.

Specifically, the styrenic monomer may be contained in an amount of 10 to 60% by weight based on the total weight of the composition. If the styrenic monomer is contained in an amount of less than 10% by weight, electrolyte resistance may be deteriorated. Conversely, If the content of the styrene-based monomer exceeds 60% by weight, the binding force between the active material and the current collector may be insufficient.

Meanwhile, the composition for a binder according to the present invention may further comprise one or more materials selected from the group consisting of viscosity regulators, crosslinking agents, emulsifiers, polymerization initiators, molecular weight regulators, dispersants and fillers.

The viscosity adjusting agent may be added up to 10% by weight based on the total weight of the electrode mixture, so as to control the viscosity of the electrode mixture so that the mixing process of the electrode mixture and the coating process on the collector may be easy. Examples of such viscosity modifiers include carboxymethylcellulose, polyacrylic acid, and the like, but are not limited thereto.

The crosslinking agent may be, for example, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, 1,3-butadiol dimethacrylate, 1,6-hexanediol dimethacrylate, (AMA), triarylisocyanurate (TAIC), triarylamine (trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, TAA), diarylamine (DAA), polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polybutylene glycol diacrylate, and the like.

Examples of the emulsifier include fatty acid type systems such as oleic acid, stearic acid, lauric acid, sodium or potassium salts of mixed fatty acids, and general anionic emulsifiers such as rosin acid, and polyoxyethylene Nonionic emulsifiers such as lauryl ether, polyoxyethylene glycol, and polyoxyethylene nonylphenyl ether can be used.

The polymerization initiator may be, for example, lauroyl peroxide, diisopropyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate, t-butyl peroxypivalate, 3,3,5-trimethylhexanoyl Organic peroxides such as peroxide; Azo compounds such as 2,2'-azobisisobutyronitrile; Ammonium persulfate; Potassium persulfate and the like can be used.

The filler is an auxiliary component for suppressing the expansion of the electrode. The filler is not particularly limited as long as it is a fibrous material without causing a chemical change in the battery, and examples thereof include olefin polymers such as polyethylene and polypropylene; Fibrous materials such as glass fibers and carbon fibers are used.

The molecular weight regulators and dispersants may be those known in the art.

The present invention also provides a binder for an electrode of a secondary battery produced by polymerizing the composition for a binder.

Such a binder for an electrode of a secondary battery may include such polymer particles. Specifically, the binder produced by the polymerization may be in the form of particles having an average particle diameter of 0.05 mu m to 0.7 mu m.

The present invention also provides an electrode mixture for a secondary battery comprising the binder and an electrode active material capable of intercalating / deintercalating lithium.

The binder may be contained in an amount of, for example, 0.5 to 20% by weight, preferably 1 to 10% by weight based on the weight of the electrode mixture.

Preferable examples of the electrode active material include lithium transition metal oxide powder or carbon powder.

The present invention also provides an electrode for a secondary battery, wherein the electrode mixture is applied to a current collector.

The electrode can be manufactured by applying the electrode mixture to the current collector, followed by drying and rolling. The electrode for the secondary battery may be an anode or a cathode.

The positive electrode is prepared, for example, by applying a mixture of a positive electrode active material, a conductive material, a binder and the like on the positive electrode current collector, and drying the mixture. The negative electrode is formed by applying a mixture of a negative electrode active material, Followed by drying. In some cases, the negative electrode may not contain a conductive material.

The electrode active material in the electrode is a material capable of causing an electrochemical reaction, and the positive electrode active material and the negative electrode active material exist depending on the type of the electrode.

The positive electrode active material is a lithium transition metal oxide. The lithium-transition metal oxide is a layered compound such as lithium cobalt oxide (LiCoO ₂ ) and lithium nickel oxide (LiNiO ₂ ), which contains two or more transition metals and is substituted with, for example, one or more transition metals ; Lithium manganese oxide substituted with one or more transition metals; Formula _{LiNi 1-y M y O 2} ( where, M = Co, Mn, Al , Cu, Fe, Mg, B, Cr, Zn or Ga and Lim, 0.01≤y≤0.7 include one or more elements of the element) A lithium nickel-based oxide represented by the following formula: _{Li 1 + z Ni 1/3 Co 1/3} Mn 1/3 O 2, Li 1 + z Ni 0.4 Mn 0.4 Co 0.2 O 2 , such as _{Li 1 + z Ni b Mn c} Co 1- (b + c + d _{) M d O (2-e} ) A e ( where, -0.5≤z≤0.5, 0.1≤b≤0.8, 0.1≤c≤0.8, 0≤d≤0.2 , 0≤e≤0.2, b + c + d <1, M = Al, Mg, Cr, Ti, Si or Y, and A = F, P or Cl; lithium nickel cobalt manganese composite oxide; And the formula _{Li 1 + x M 1-y} M 'y PO 4-z X z ( wherein, M = a transition metal, preferably Fe, Mn, Co or Ni, M' = Al, Mg or Ti, X = F, S or N, and -0.5? X? +0.5, 0? Y? 0.5, and 0? Z? 0.1), but the present invention is not limited thereto.

Examples of the negative electrode active material include carbon and graphite materials such as natural graphite, artificial graphite, expanded graphite, carbon fiber, non-graphitizable carbon, carbon black, carbon nanotube, fullerene and activated carbon; Metals such as Al, Si, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, Pd, Pt and Ti which can be alloyed with lithium and compounds containing these elements; Complexes of metals and their compounds and carbon and graphite materials; Lithium-containing nitrides, and the like. Among them, a carbon-based active material, a silicon-based active material, a tin-based active material, or a silicon-carbon based active material is more preferable, and these may be used singly or in combination of two or more.

The conductive material is a component for further improving the conductivity of the electrode active material and may be added in an amount of 0.01 to 30% by weight based on the total weight of the electrode mixture. Such a conductive material is not particularly limited as long as it has electrical conductivity without causing chemical changes in the battery, for example, graphite such as natural graphite or artificial graphite; Carbon black such as carbon black, acetylene black, ketjen black, channel black, furnace black, lamp black, and summer black; Carbon fibers such as carbon nanotubes and fullerene; conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride, aluminum, and nickel powder; Conductive whiskey such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The current collector in the electrode is a portion where electrons move in the electrochemical reaction of the active material, and the positive electrode collector and the negative electrode collector exist depending on the type of the electrode.

The cathode current collector is generally made to a thickness of 3 micrometers to 500 micrometers. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery, and may be formed of a material such as stainless steel, aluminum, nickel, titanium, sintered carbon, or a surface of aluminum or stainless steel Treated with carbon, nickel, titanium, silver or the like may be used.

The negative electrode current collector is generally made to have a thickness of 3 micrometers to 500 micrometers. Such an anode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery, and may be formed of a material such as copper, stainless steel, aluminum, nickel, titanium, fired carbon, surface of copper or stainless steel A surface treated with carbon, nickel, titanium, silver or the like, an aluminum-cadmium alloy, or the like can be used.

These current collectors 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, or the like, by forming fine irregularities on the surface of the current collectors to enhance the binding force of the electrode active material.

The present invention provides a lithium secondary battery including the electrode.

The lithium secondary battery generally comprises a separator and a non-aqueous electrolyte containing a lithium salt in addition to the electrode.

The separator is an insulating thin film interposed between the anode and the cathode and having high ion permeability and mechanical strength. The pore diameter of the separator is generally 0.01 micrometer to 10 micrometers, and the thickness is generally 5 micrometers to 300 micrometers. As such a separation membrane, for example, a sheet or a nonwoven fabric made of an olefin-based polymer such as polypropylene which is chemically resistant and hydrophobic, glass fiber, polyethylene or the like is used. When a solid electrolyte such as a polymer is used as an electrolyte, the solid electrolyte may also serve as a separation membrane.

The lithium-containing non-aqueous electrolyte is composed of a non-aqueous electrolyte and a lithium salt.

Examples of the nonaqueous electrolytic solution include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, But are not limited to, lactone, 1,2-dimethoxyethane, tetrahydroxyfuran, 2-methyltetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, Nitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxymethane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives , Tetrahydrofuran derivatives, ether, methyl pyrophosphate, ethyl propionate and the like can be used.

The lithium salt is a material which is soluble in the non-aqueous liquid electrolyte and includes, for example, LiCl, LiBr, LiI, LiClO ₄ , LiBF ₄ , LiB ₁₀ Cl ₁₀ , LiPF ₆ , LiCF ₃ SO ₃ , LiCF ₃ CO ₂ , LiAsF _{6, LiSbF 6, LiAlCl 4,} CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide have.

In some cases, organic solid electrolytes, inorganic solid electrolytes, etc. may be used.

Examples of the organic solid electrolyte include a polymer electrolyte such as a polyethylene derivative, a polyethylene oxide derivative, a polypropylene oxide derivative, a phosphate ester polymer, an agitation lysine, a polyester sulfide, a polyvinyl alcohol, a polyvinylidene fluoride, Polymers containing ionic dissociation groups, and the like can be used.

Examples of the inorganic solid electrolyte include Li ₃ N, LiI, Li ₅ NI ₂ , Li ₃ N-LiI-LiOH, LiSiO ₄ , LiSiO ₄ -LiI-LiOH, Li ₂ SiS ₃ , Li ₄ SiO ₄ , Nitrides, halides and sulfates of Li such as Li ₄ SiO ₄ -LiI-LiOH and Li ₃ PO ₄ -Li ₂ S-SiS ₂ can be used.

For the purpose of improving the charge-discharge characteristics and the flame retardancy, the non-aqueous liquid electrolyte may contain, for example, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, glyme, , Nitrobenzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxyethanol, . In some cases, halogen-containing solvents such as carbon tetrachloride and ethylene trifluoride may be further added to impart nonflammability. In order to improve the high-temperature storage characteristics, carbon dioxide gas may be further added. FEC (Fluoro-Ethylene carbonate, PRS (propene sultone), FEC (fluoro-ethylene carbonate), and the like.

The secondary battery according to the present invention can be used not only in a battery cell used as a power source of a small device but also as a unit cell in a middle- or large-sized battery module including a plurality of battery cells used as a power source of a medium- .

Preferred examples of the above medium to large devices include a power tool that is powered by an electric motor and moves; An electric vehicle including an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and the like; An electric motorcycle including an electric bike (E-bike) and an electric scooter (E-scooter); An electric golf cart; And an energy storage system, but the present invention is not limited thereto.

As described above, the composition for a binder for an electrode of a secondary battery according to the present invention contains a monomer containing an oxazoline group and a monomer containing a carboxylic acid group, or a monomer containing an oxazoline group and a carboxylic acid group at the same time It is possible to exhibit a strong bonding force even in a small amount as compared with the binders which have been used in the past, and it is possible to prevent the electrode thickness from being increased during the production of the electrode.

In the following Examples, Comparative Examples and Experimental Examples, the contents of the present invention will be described in more detail, but the present invention is not limited thereto.

&Lt; Example 1 >

(5 g) as a monomer containing an oxazoline group, acrylic acid (5 g) as a monomer containing a carboxylic acid group, butyl acrylate (60 g) as a (meth) acrylic acid ester monomer, , Styrene (30 g) as a styrene monomer, and polyoxyethylene glycol and sodium lauryl sulfate as an emulsifier were added to water containing a polymerization initiator, potassium sulfate, and they were mixed and mixed at a temperature of about 70 And the reaction was terminated by cooling at a point of time when the polymerization conversion reached 96%, thereby preparing a binder.

&Lt; Example 2 >

A binder was prepared in the same manner as in Example 1 except that 60 g of butadiene was used in place of butyl acrylate in the preparation method of Example 1. [

&Lt; Comparative Example 1 &

A binder was prepared in the same manner as in Example 1, except that 15 g of 2-isopropenyl-2-oxazoline was added in the preparation method of Example 1.

&Lt; Comparative Example 2 &

A binder was prepared in the same manner as in Example 1 except that 15 g of acrylic acid was added in the preparation method of Example 1. [

&Lt; Comparative Example 3 &

A binder was prepared in the same manner as in Example 1 except that 2-isopropenyl-2-oxazoline was not included in the preparation method of Example 1.

&Lt; Comparative Example 4 &

A binder was prepared in the same manner as in Example 1 except that acrylic acid was not contained in the preparation method of Example 1. [

&Lt; Comparative Example 5 &

A binder made of polyvinylidene fluoride (PVdF) was produced.

&Lt; Experimental Example 1 > Adhesion test with current collector

First, each of the binders according to Examples 1 and 2 and Comparative Examples 1 to 5 was used to prepare a test slurry in which the ratio of the negative electrode active material, the conductive material, the thickener, and the binder was adjusted to be 96: 1: 1: 2 , The slurry was coated on a Cu foil to prepare an electrode, and each was dried at 80 ° C.

The prepared electrode was pressed at a constant thickness, cut at regular intervals, and fixed on a slide glass. The collector was peeled off and a 180-degree peel strength was measured. The results are shown in Table 1 below. The evaluation was made by measuring the peel strengths of 5 or more and calculating the average value.

Adhesion (gf / cm) Example 1 30 Example 2 28 Comparative Example 1 18 Comparative Example 2 15 Comparative Example 3 22 Comparative Example 4 15 Comparative Example 5 12

As shown in Table 1, it was confirmed that the binders of Examples 1 and 2 according to the present invention exhibited a higher adhesive strength to the current collector than Comparative Examples 1 to 5.

&Lt; Experimental Example 2 > Adhesion test with active material

The tapes were newly attached to the surfaces of the electrode assemblies of Examples and Comparative Examples in which the current collectors were peeled off in Experimental Example 1, and the tape peel strength was measured while removing the tape. The results are shown in Table 2 below. The evaluation was made by measuring the peel strengths of 5 or more and calculating the average value.

Adhesion (gf / cm) Example 1 212 Example 2 232 Comparative Example 1 185 Comparative Example 2 205 Comparative Example 3 121 Comparative Example 4 94 Comparative Example 5 88

As shown in Table 2, the binders of Examples 1 and 2 according to the present invention are superior to those of Comparative Examples 1 to 5 in adhesion as well as adhesiveness to the current collector.

Accordingly, the binder according to the present invention can be produced by polymerizing a monomer containing an oxazoline group and a monomer containing a carboxylic acid group, thereby producing a binder exhibiting a stronger binding force than conventional binders based on the same amount.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (19)

A binder for an electrode of a secondary battery produced by polymerizing a composition for the production of a binder for an electrode of a secondary battery, which comprises a polymer of monomers,
The monomers include monomers comprising an oxazoline group; A monomer having a carboxylic acid group capable of binding to the oxazoline group by a chemical reaction; At least one monomer selected from the group consisting of (meth) acrylic acid ester monomers and butadiene monomers; And a styrene-based monomer,
The oxazoline group-containing monomer is contained in an amount of 1 to 10% by weight based on the total weight of the composition,
Wherein the monomer containing a carboxylic acid group is contained in an amount of 1 wt% to 10 wt% based on the total weight of the composition. The method of claim 1, wherein the monomer containing an oxazoline group is at least one selected from the group consisting of 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, Isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2- Ethyl-2-oxazoline. &Lt; RTI ID = 0.0 &gt; 11. &lt; / RTI &gt; delete The binder for an electrode of a secondary battery according to claim 1, wherein the monomer containing a carboxylic acid group is an ethylenically unsaturated carboxylic acid monomer. The secondary battery according to claim 4, wherein the ethylenically unsaturated carboxylic acid monomer is at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, and itaconic acid. Wherein delete The acrylic pressure-sensitive adhesive composition according to claim 1, wherein the (meth) acrylic acid ester monomer is at least one selected from the group consisting of methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, n- Propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, n-butyl methacrylate, Methacrylate, isobutyl methacrylate, n-amyl methacrylate, isoamyl methacrylate, n-hexyl methacrylate, n-ethylhexyl methacrylate, 2-ethylhexyl methacrylate, Wherein the polymer is at least one monomer selected from the group consisting of acrylate, acrylate, and hydroxypropyl methacrylate. Binder. The binder for an electrode of a secondary battery according to claim 1, wherein the (meth) acrylate monomer is contained in an amount of 5 to 60% by weight based on the total weight of the composition. 2. The method according to claim 1, wherein the butadiene-based monomer is at least one selected from the group consisting of 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3- Wherein the binder is at least one selected from the group consisting of polyvinylidene fluoride (PVD) and polyvinylidene fluoride (PVD). The binder for an electrode of a secondary battery according to claim 1, wherein the butadiene-based monomer is contained in an amount of 5% by weight to 60% by weight based on the total weight of the composition. The secondary battery according to claim 1, wherein the styrenic monomer is at least one compound selected from the group consisting of styrene,? -Methylstyrene,? -Methylstyrene, pt-butylstyrene and divinylbenzene. Binder. The binder for a secondary battery according to claim 1, wherein the styrene-based monomer is contained in an amount of 10% by weight to 60% by weight based on the total weight of the composition. The binder for an electrode according to claim 1, wherein the composition further comprises at least one material selected from the group consisting of a viscosity modifier, a crosslinking agent, an emulsifier, a polymerization initiator, a molecular weight modifier, a dispersing agent and a filler. delete The binder for an electrode of a secondary battery according to claim 1, wherein the binder produced by the polymerization is in the form of particles having an average particle diameter of 0.05 mu m to 0.7 mu m. A binder for an electrode of a secondary battery according to claim 1, and an electrode active material capable of intercalating / deintercalating lithium. 17. The electrode assembly according to claim 16, wherein the electrode active material is a lithium transition metal oxide powder or carbon powder. The electrode for a secondary battery according to claim 16, wherein the electrode mixture of the secondary battery is applied to the electrode current collector. A lithium secondary battery comprising the electrode for a secondary battery according to claim 18.