CN114335546A - Binder for battery electrode and battery electrode - Google Patents
Binder for battery electrode and battery electrode Download PDFInfo
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- CN114335546A CN114335546A CN202210217403.6A CN202210217403A CN114335546A CN 114335546 A CN114335546 A CN 114335546A CN 202210217403 A CN202210217403 A CN 202210217403A CN 114335546 A CN114335546 A CN 114335546A
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Abstract
The invention relates to a binder for a battery electrode and the battery electrode, wherein the binder comprises a solvent, modified polyvinyl alcohol and a polyphenol compound, the modified polyvinyl alcohol is a product obtained by copolymerizing vinyl carboxylate, acrylamide with a side chain containing hydroxyl and long-chain alkyl acrylate and then performing hydrolysis or alcoholysis, the polyphenol compound contains a benzene ring structure, the benzene ring structure contains more than two phenolic hydroxyl groups, and the mass of the polyphenol compound is 5-30% of that of the modified polyvinyl alcohol. According to the invention, polyvinyl alcohol is modified, and functional structural units of acrylamide and long-chain alkyl acrylate with hydroxyl groups on side chains are introduced, so that the prepared binder has stronger binding power for binding the silicon-based negative active material, stronger capacity for inhibiting volume expansion of the silicon-based negative active material and better uniform and stable dispersing capacity for the silicon-based negative active material; meanwhile, the thermal stability of the polyvinyl alcohol as the lithium ion battery binder is improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a binder for a battery electrode and the battery electrode.
Background
Since 1991, the lithium ion battery has made great progress in commercialization, is widely applied to various portable electronic devices, new energy automobiles and other fields, and is the most widely applied chemical power source at present. Since commercialization, lithium ion batteries have been increasingly energy-dense through the continuous optimization of materials and technologies, but have not yet been able to meet the pursuit of higher energy density energy storage systems. The conventional lithium ion battery uses graphite as a negative electrode, the theoretical specific capacity of the conventional lithium ion battery is only 372 mAh/g, and the energy density of the conventional lithium ion battery is difficult to greatly improve. Researches find that the theoretical specific capacity of silicon can reach 4200 mAh/g, which is eleven times of that of graphite, and the silicon is rich in storage capacity in the earth crust, low in cost, and capable of rapidly getting out of various high-capacity negative electrode materials, so that the silicon is one of the most important negative electrode materials of next-generation high-specific-energy lithium ion batteries. However, the silicon-based negative electrode material has some defects, such as a large volume change in the lithium deintercalation process, the generated stress easily causes the cracking and pulverization of silicon particles and the loss of activity, and in addition, the large volume change also causes the continuous cracking and recombination of a solid electrolyte interface film (SEI), so that the consumption of active lithium is caused, and the capacity of the silicon-based negative electrode is sharply attenuated in the circulation comprehensively, and the practical application of the silicon-based negative electrode is severely limited.
In order to solve the above problems, researchers in various countries have conducted a great deal of research from different perspectives. In the preparation of the electrode of the lithium ion battery, the adhesive accounts for less than 5 percent of the weight, but is an essential component for adhering the active material, the conductive carbon and the current collector together to keep the structural integrity and the conductivity, and plays an important role in maintaining the long-term stability of the electrode. The traditional lithium ion battery uses graphite as a negative electrode, the volume change of the graphite in the process of lithium desorption and intercalation is very small, and the commercialized sodium carboxymethyl cellulose/styrene-butadiene latex (CMC/SBR) binder can play a good role; however, for silicon-based negative electrodes of varying bulk, the capacity drops rapidly with CMC/SBR binders. Numerous studies have shown that the use of different binders has a significant impact on the performance of silicon-based anodes. The weak binding force of the CMC/SBR binder is difficult to deal with the larger volume change of the silicon-based negative electrode, and is the main reason of poor cycle performance of the silicon-based negative electrode. The polymer containing a large amount of hydroxyl can form stronger interaction with a silicon-based negative electrode material, is favorable for inhibiting the problems of volume expansion and the like of a silicon-based negative electrode, and is a potential binder for the silicon-based negative electrode. However, the weak interaction between the polymer molecules is not favorable for uniform and stable dispersion of the anode material in the slurry, and the cycling stability of the silicon-based anode is further improved.
The polyvinyl alcohol is a water-based polyhydroxy polymer, has controllable molecular weight and high hydroxyl content, and is a potential adhesive for lithium batteries. The use of polyethylene alone as a binder is not ideal due to the high viscosity of polyvinyl alcohol, difficulty in uniform coating on the current collector, and its low electrolyte resistance, and there may be other unknown reasons, especially the rapid deterioration of battery performance during charge and discharge cycles at high temperatures. And at present many fields that need the heavy current discharge, for example new energy automobile, unmanned aerial vehicle, the high performance lithium electricity of toy telecar, the battery is in quick charge, lasts the heavy current discharge state, and the battery temperature is very easily above 60 ℃, and the battery performance that uses polyvinyl alcohol as the binder can decay soon. In addition, when the binder is used, adhesion to the current collector is also required to be performed under heat treatment conditions. The above-described unstable state of polyvinyl alcohol at high temperature is required to further improve the stability at high temperature as a binder for lithium batteries.
Disclosure of Invention
The present invention aims to overcome the above-mentioned drawbacks of the prior art and to provide a binder based on modified polyvinyl alcohol to improve the cycling stability of silicon-based negative electrodes, in particular at high temperatures.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the binder for the battery electrode comprises a solvent, modified polyvinyl alcohol and a polyphenol compound, wherein the modified polyvinyl alcohol is a product obtained by copolymerizing vinyl carboxylate, acrylamide with a side chain containing hydroxyl and long-chain alkyl acrylate and then performing hydrolysis or alcoholysis, the polyphenol compound contains a benzene ring structure, the benzene ring structure contains more than two phenolic hydroxyl groups, and the mass of the polyphenol compound is 5-30% of that of the modified polyvinyl alcohol.
Further, the mass of the polyphenol compound is 10-20% of that of the modified polyvinyl alcohol.
The polyphenol compound is selected from tannic acid (also known as tannic acid, C)76H52O46Has a chemical structure of
) Gallic acid (3, 4, 5-trihydroxybenzoic acid, (HO)3C6H2CO2H, chemical structure of
) Quercetin (3, 3 ', 4', 5, 6-pentahydroxyflavone, C)15H10O7Has a chemical structure of
) And 2,3, 4-trihydroxybenzoic acid (b)
) One or more than two of them. The tannin, the gallic acid, the quercetin or the 2,3, 4-trihydroxybenzoic acid all contain benzene rings, and the benzene rings contain more than two phenolic hydroxyl groups, so that a strong hydrogen bond can be formed with hydroxyl groups in a polyhydroxy polymer, and the polyhydroxy polymer is crosslinked, thereby being beneficial to improving the binding power of a binding agent and uniform and stable dispersion of a negative active material in the binding agent in a pulping process, and improving the cycling stability of a battery negative electrode.
Preferably, the polyphenol compound is a compound of tannic acid and other small molecule polyphenols (at least one of gallic acid, quercetin and 2,3, 4-trihydroxybenzoic acid) according to a mass ratio of 3-7: 1. The function of the polyphenol compound is to form a certain cross-linking structure through hydrogen bonds with hydroxyl groups. According to the invention, the large-molecule polyphenol compound tannic acid and other polyphenol compounds with small relative molecular weights are compounded together, so that the crosslinking degree is improved by the large molecules, stronger binding power is provided, and the crosslinking density is adjusted by the small-molecule polyphenol, so that the condition that the binder is not uniformly coated due to overhigh viscosity of the binder is avoided.
Preferably, in the raw material of the modified polyvinyl alcohol, the molar ratio of the vinyl carboxylate, the acrylamide containing hydroxyl groups on the side chains and the long-chain alkyl acrylate is 30-45: 10-15:2-4.
The vinyl carboxylate is selected from vinyl acetate (CH)3COOCH=CH2) Vinyl propionate (CH)3CH2COOCH=CH2) Vinyl n-butyrate (CH)3CH2CH2COOCH=CH2) Vinyl valerate (CH)3(CH2)3COOCH=CH2) Vinyl pivalate ((CH)3)3CCOOCH=CH2) Vinyl decanoate (CH)3(CH2)8COOCH=CH2) Vinyl benzoate (C)6H5COOCH=CH2) Vinyl trifluoroacetate (CF)3CO2CH=CH2) And vinyl chloroacetate (ClCH)2COOCH=CH2) At least one of (1), vinyl acetate is preferably used in view of availability of monomers and low cost; the acrylamide monomer with a hydroxyl group in a side chain is selected from at least one of N-hydroxyethyl acrylamide, N-hydroxyethyl methacrylamide and N-tri (hydroxymethyl) methacrylamide, and is preferably N-tri (hydroxymethyl) methacrylamide; the long-chain alkyl acrylate is selected from at least one of butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate and n-octyl (meth) acrylate.
The inventor finds that the modified polyvinyl alcohol is still a water-based adhesive, is green and environment-friendly and does not need to use an organic solvent by adding a certain amount of acrylamide structural units with side chains containing hydroxyl groups and a small amount of long-chain alkyl acrylate structural units into a molecular chain segment. The bonding strength of the modified polyvinyl alcohol obtained by adding the two functional monomers is high, more importantly, the modified polyvinyl alcohol is used as an adhesive, the thermal stability is improved, and the cycling stability of the battery is obviously improved under the test condition of 60 ℃. Fig. 1 can be referred to show the structure of the binder for a battery electrode of the present invention, wherein a winding curve represents a high molecular long chain structure of modified polyvinyl alcohol, a sphere represents a rigid main body (including at least one benzene ring structure) of a polyphenol compound, and by doping the polyphenol compound in the modified polyvinyl alcohol, two or more phenolic hydroxyl groups on the benzene ring structure can form a strong hydrogen bond crosslinking effect with hydroxyl groups in a surrounding polyhydroxy polymer, so as to improve the binding power of the binder, and significantly inhibit the volume expansion of a silicon-based negative electrode material; and the interaction between the reinforced polymers can improve the uniform and stable dispersion of the cathode active material in the binder in the pulping process.
Further, the modified polyvinyl alcohol is prepared by a preparation method comprising the following steps: and dissolving vinyl carboxylate, acrylamide with a side chain containing hydroxyl and long-chain alkyl acrylate in an alcohol aqueous solution, adding an emulsifier and an initiator, and performing emulsion polymerization to obtain a product, and performing hydrolysis or alcoholysis to obtain the modified polyvinyl alcohol. The molecular weight of the obtained modified polyvinyl alcohol is 5 to 10 ten thousand.
The alcohol aqueous solution is 50-80% aqueous solution of alcohol (methanol, ethanol, isopropanol) with carbon number of 1-3.
The initiator and the emulsifier are not particularly limited, and may be radical initiators and emulsifiers for emulsion polymerization commonly used in the art, such as sodium persulfate, potassium persulfate and ammonium persulfate, and the amount of the initiator is 0.5-1wt% of the total mass of the monomers; the emulsifier is selected from at least one of anionic surfactants such as sodium dodecyl sulfate and sodium dodecyl benzene sulfonate, and the amount of the emulsifier is 1-3wt% of the total mass of the monomer and the solvent.
The solid content of the binder of the present invention is not particularly limited as long as it satisfies the range of 20 to 40% of the solid content of the mixed slurry of the electrode active material, the conductive agent and the binder when preparing the electrode. In one embodiment of the present invention, the solid content of the binder is 1 to 40%, preferably 10 to 15%, and the viscosity of the binder is 200 and 5000mPa · s, in order to better disperse the silicon-based negative electrode active material and provide better adhesion. The adhesive with different concentration (solid content) and viscosity can be prepared according to different occasions.
The binder for the battery electrode is prepared by a preparation method comprising the following steps of: mixing the modified polyvinyl alcohol and the polyphenol compound with a solvent according to a ratio. Specifically, the polyhydroxy polymer and the polyphenol compound may be prepared into solutions respectively and then mixed uniformly, or the polyhydroxy polymer and the polyphenol compound may be mixed and then redispersed or dissolved in a solvent, of course, other mixing orders may be adopted as long as the polyhydroxy polymer and the polyphenol compound are finally mixed uniformly. In order to achieve more uniform mixing, the mixed solution after mixing may be heated to 35 to 99 ℃, but the mixing uniformity may be improved by a stirring device or the like.
The solvent includes water or a mixed solvent of water and a hydrophilic organic solvent. The polyvinyl alcohol is a water-soluble polyhydroxy polymer, and the modified polyvinyl alcohol copolymer can be used for conveniently constructing a water-based binder system, so that the binder and the battery electrode are more environment-friendly, and the preparation process of the binder and the preparation process of the battery electrode are more environment-friendly and safer. The water-soluble organic solvent may be one or more selected from methanol, ethanol, propanol, isopropanol, ethylene glycol, propylene glycol, acetone, tetrahydrofuran, N-dimethylformamide, N-methylpyrrolidone, and the like, and it is preferable to use a low-boiling alcohol solvent such as ethanol in view of easy removal and low toxicity.
The invention also provides a battery electrode, which comprises a current collector and a solid electrode formed on the current collector, wherein the solid electrode is formed by wet mixing the electrode active material and the conductive agent by using the binder for the battery electrode.
The electrode active material can be a silicon-based negative electrode active material, and can also be an existing graphite negative electrode active material and the like. The silicon-based negative electrode active material may be one or a combination of two or more selected from silicon, micro silicon, porous silicon, amorphous silicon, a silicon oxide compound, silicon monoxide, a silicon compound, a silicon carbon composite material, and the like.
The preparation method of the battery electrode comprises the following steps: mixing the electrode active material, conductive carbon and the binder of the invention for pulping, adjusting the appropriate viscosity, then uniformly coating the mixture on the surface of a current collector, and drying at 60-120 ℃ to obtain the battery electrode or pole piece, wherein the mass percentage of the binder in the electrode or pole piece is 1-20%, such as 5%, 7%, 10% and 15%.
The embodiment of the invention has the following beneficial effects:
according to the invention, polyvinyl alcohol is modified, and functional structural units of acrylamide and long-chain alkyl acrylate with hydroxyl groups on side chains are introduced, so that the prepared binder has stronger binding power for binding the silicon-based negative active material, stronger capacity for inhibiting volume expansion of the silicon-based negative active material and better uniform and stable dispersing capacity for the silicon-based negative active material; meanwhile, the thermal stability of the polyvinyl alcohol as the lithium ion battery binder is improved, so that the cycling stability of the battery at the high temperature of 60 ℃ is obviously improved.
The polyphenol compound and the modified polyvinyl alcohol are used together, and phenolic hydroxyl groups of the polyphenol compound can form a strong hydrogen bond crosslinking effect with hydroxyl groups on the surrounding polyvinyl alcohol, so that the intermolecular interaction and the binding force of the polyhydroxy polymer are improved, and the volume expansion of the silicon-based negative electrode material can be obviously inhibited; the interaction between the reinforced polymers can improve the uniform and stable dispersion of the negative active material in the binder in the pulping process.
Drawings
Fig. 1 is a schematic view of the structure of the binder for battery electrodes according to the present invention.
Detailed Description
The invention is further explained and illustrated by the following detailed description.
Preparation example 1
According to a molar ratio of vinyl acetate, N-tris (hydroxymethyl) methacrylamide and 2-ethylhexyl acrylate of 30: 15:2, adding the mixture into a 70% ethanol aqueous solution, adding potassium persulfate accounting for 0.7% of the total mass of the monomers as an initiator, adding sodium dodecyl benzene sulfonate accounting for 2.5wt% of the total mass of the monomers and the ethanol aqueous solution as an emulsifier, initiating a copolymerization reaction at 70 ℃, and reacting for 6 hours. After the reaction is finished, 65g/L of ethanol solution of sodium hydroxide is dropwise added, the temperature is heated to 60 ℃ again, alcoholysis reaction is carried out until the alcoholysis degree is over 90%, and the modified polyvinyl alcohol is finally obtained after the reaction solution is subjected to precipitation, suction filtration, washing and drying. The molecular weight of the resulting modified polyvinyl alcohol was measured by the viscometry method to be about 75000, and a schematic diagram of a simulation of the structure is shown in FIG. 1.
Preparation example 2
The other operations and conditions were the same as in preparation example 1, except that the monomers were vinyl acetate, N-hydroxyethyl methacrylamide and isooctyl acrylate in a molar ratio of 45: 10: 4 in the presence of a catalyst. The molecular weight of the resulting modified polyvinyl alcohol was measured by the viscosity method to be about 83000.
Preparation example 3
The other operations and conditions were the same as in preparation example 1 except that the molar ratio of vinyl acetate, N-tris (hydroxymethyl) methacrylamide and 2-ethylhexyl acrylate was 20:15: 3. The molecular weight of the resulting modified polyvinyl alcohol was measured by the viscosity method to be about 72000.
Preparation example 4
The other operations and conditions were the same as in preparation example 1 except that the molar ratio of vinyl acetate, N-tris (hydroxymethyl) methacrylamide and 2-ethylhexyl acrylate was 60:15: 3. The molecular weight of the resulting modified polyvinyl alcohol was measured by the viscosity method to be about 86000.
Comparative preparation example 1
The other operations and conditions were the same as in preparation example 1 except that N-tris (hydroxymethyl) methacrylamide was not added. The molecular weight of the resulting modified polyvinyl alcohol was measured by the viscosity method to be about 77000.
Comparative preparation example 2
The other operations and conditions were the same as in preparation example 1 except that 2-ethylhexyl acrylate was not added. The molecular weight of the resulting modified polyvinyl alcohol was measured by the viscosity method to be about 74000.
Example 1
Weighing 10g of the modified polyvinyl alcohol prepared in preparation example 1, 1.5g of tannic acid and 0.5g of gallic acid, adding a proper amount of a mixed solvent of deionized water and ethanol in a mass ratio of 8:2 into a 150mL flask, stirring and dissolving for 2h under a heating condition of 90 ℃, and cooling to obtain a binder solution with a solid content of 10% and a viscosity of 300 mPa.s.
Examples 2 to 4, comparative examples 1 to 2
The other conditions and operations were the same as in example 1 except that the modified polyvinyl alcohols obtained in production example 1 used in example 1 were replaced with modified polyvinyl alcohols obtained in production examples 2 to 4, and comparative production examples 1 and 2, respectively, in examples 2 to 4 and comparative examples 1 to 2, respectively.
Example 5
The other conditions and operation were the same as in example 1 except that 1.75g of tannic acid, 0.25g of 2,3, 4-trihydroxybenzoic acid was used in place of 1.5g of tannic acid, and 0.5g of gallic acid.
Example 6
The other conditions and operation were the same as in example 1 except that 1.33g of tannic acid and 0.67g of gallic acid were used in place of 1.5g of tannic acid and 0.5g of gallic acid.
Example 7
The other conditions and operation were the same as in example 1 except that 1.8g of tannic acid and 0.2g of gallic acid were used in place of 1.5g of tannic acid and 0.5g of gallic acid.
Example 8
The other conditions and operation were the same as in example 1 except that 2g of tannic acid was used instead of 1.5g of tannic acid and 0.5g of gallic acid.
Example 9
The other conditions and operation were the same as in example 1 except that 2g of gallic acid was used in place of 1.5g of tannic acid and 0.5g of gallic acid.
Application example
1, slurry stabilization time:
and (3) standing the prepared cathode slurry with the solid content of 45%, sampling the upper layer of the slurry at different standing times, drying for two hours at 150 ℃, testing the solid content, judging the stability of the slurry, and judging that the slurry is unstable when the solid content is obviously less than 45%.
2, bonding property:
the adhesive of each embodiment and the comparative example is used for preparing a silicon-based negative electrode plate of the lithium ion battery, and the preparation method comprises the following steps: 1) silicon-based negative electrode material (silicon monoxide), conductive agent (super P), binder dry base (prepared by the examples and the comparative examples, wherein the mass of the binder dry base is obtained by multiplying the mass of the binder by the mass of solid content) are mixed according to the mass ratio of 80: 10: 10, and controlling the solid content of the mixture to be 40% by adding 20% ethanol water solution; 2) and uniformly coating the prepared slurry on a copper foil current collector, and drying for 12 hours in a vacuum oven at the temperature of 100 ℃ for later use. Rolling, cutting into a test sample with the size of 20 x 100mm, adopting a GBH-1 electronic tensile testing machine, referring to GB/T2792 and 2014, fixing the side of the sample coated with the adhesive on a stainless steel plate of the testing machine by using a double-sided adhesive tape, fixing one end of the stripped sample on a tensile probe, and carrying out 180-degree stripping at a constant speed of 50mm/min to test the stripping strength of the sample.
3, manufacturing a silicon-based negative electrode plate of the lithium ion battery, assembling the lithium ion half battery and testing the electrical property
The adhesive of each example 1-9 and the adhesive of each comparative example 1-2 are used for preparing the silicon-based negative pole piece of the lithium ion battery to respectively obtainTo application examples 1-9 and comparative application examples 1-2, the steps were as follows: 1) silicon-based negative electrode material (silicon monoxide), conductive agent (super P), binder dry base (prepared by the examples and the comparative examples, wherein the mass of the binder dry base is obtained by multiplying the mass of the binder by the mass of solid content) are mixed according to the mass ratio of 80: 10: 10, and controlling the solid content of the mixture to be 40% by adding 20% ethanol water solution; 2) uniformly coating the prepared slurry on a copper foil current collector, and drying for 12 hours in a vacuum oven at the temperature of 60 ℃ for later use; 3) cutting the pole piece into a circular pole piece with the diameter of 10mm for assembling the lithium ion battery; 4) adopting a metal lithium sheet as a counter electrode and adopting 1 mol/L LiPF6(the solvent is a mixed solution of Ethylene Carbonate (EC) and diethyl carbonate (DEC) in a volume ratio of 1: 1, 5% by volume of fluoroethylene carbonate (FEC)) is added as an electrolyte, and a polypropylene microporous diaphragm is assembled into a 2032 type button cell in a glove box in an argon atmosphere; 5) the blue test system is adopted to carry out charge-discharge cycle test, the charge-discharge cut-off voltage is 1.5V and 0.005V, the multiplying power is 0.5C, and the result is shown in Table 1.
Table 1: electrochemical performance test result of silicon-based negative electrode plate prepared by using different binders
Therefore, the adhesive provided by the invention modifies polyvinyl alcohol, is used together with a polyphenol compound, has long slurry stability time and high adhesive force, and can obviously improve the high-temperature cycle stability of the electrode.
Claims (10)
1. The binder for the battery electrode is characterized in that raw materials for preparing the binder comprise a solvent, modified polyvinyl alcohol and a polyphenol compound, wherein the modified polyvinyl alcohol is a product obtained by copolymerizing vinyl carboxylate, acrylamide with a side chain containing hydroxyl and long-chain alkyl acrylate and then performing hydrolysis or alcoholysis on the copolymer, the polyphenol compound has a benzene ring structure, the benzene ring structure has more than two phenolic hydroxyl groups, and the mass of the polyphenol compound is 5-30% of that of the modified polyvinyl alcohol.
2. The binder according to claim 1, wherein the mass of the polyphenol compound is 10 to 20% of the modified polyvinyl alcohol.
3. The binder according to claim 1, wherein the polyphenol compound is one or more selected from the group consisting of tannic acid, gallic acid, quercetin and 2,3, 4-trihydroxybenzoic acid.
4. The binder according to claim 3, wherein the polyphenol compound is a combination of tannic acid and other small molecule polyphenols according to a mass ratio of 3-7:1, and the other small molecule polyphenols are at least one selected from gallic acid, quercetin and 2,3, 4-trihydroxybenzoic acid.
5. The binder according to claim 3, wherein the molar ratio of the vinyl carboxylate, the acrylamide having a hydroxyl group in a side chain thereof, and the long-chain alkyl acrylate is 30 to 45: 10-15:2-4.
6. The binder of claim 1 wherein the vinyl carboxylate is selected from at least one of vinyl acetate, vinyl propionate, vinyl n-butyrate, vinyl valerate, vinyl pivalate, vinyl decanoate, vinyl benzoate, vinyl trifluoroacetate, and vinyl chloroacetate; the acrylamide with a side chain containing hydroxyl is selected from at least one of N-hydroxyethyl acrylamide, N-hydroxyethyl methacrylamide and N-tri (hydroxymethyl) methacrylamide; the long-chain alkyl acrylate is selected from at least one of butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate and n-octyl (meth) acrylate.
7. The binder of claim 1, wherein the modified polyvinyl alcohol is prepared by a preparation method comprising the steps of: and dissolving vinyl carboxylate, acrylamide with a side chain containing hydroxyl and long-chain alkyl acrylate in an alcohol aqueous solution, adding an emulsifier and an initiator, and performing emulsion polymerization to obtain a product, and performing hydrolysis or alcoholysis to obtain the modified polyvinyl alcohol.
8. The binder as claimed in claim 1, wherein the binder has a solid content of 1 to 40% and a viscosity of 200 and 5000 mPa-s.
9. A battery electrode comprising a current collector and a solid electrode formed on the current collector, the solid electrode being formed by wet mixing an electrode active material and a conductive agent with the binder for a battery electrode according to any one of claims 1 to 8.
10. The battery electrode according to claim 9, wherein the electrode active material is a silicon-based negative electrode active material or a graphite negative electrode active material, and the silicon-based negative electrode active material is one or more selected from the group consisting of silicon, micro silicon, porous silicon, amorphous silicon, a silicon oxide compound, a silicon protoxide, a silicon compound, and a silicon carbon composite material.
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| KR102660592B1 (en) * | 2022-11-15 | 2024-04-26 | 주식회사 한솔케미칼 | Binder comprising copolymer composition, anode for secondary battery comprising the same, and secondary battery comprising the anode |
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