CN110591613A - Binder for lithium ion battery cathode and preparation method thereof - Google Patents
Binder for lithium ion battery cathode and preparation method thereof Download PDFInfo
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- CN110591613A CN110591613A CN201910844786.8A CN201910844786A CN110591613A CN 110591613 A CN110591613 A CN 110591613A CN 201910844786 A CN201910844786 A CN 201910844786A CN 110591613 A CN110591613 A CN 110591613A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/10—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl-aromatic monomers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J147/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a binder for a lithium ion battery cathode, which contains at least one compound selected from compounds with structural formulas of 1, II and III. The preparation method comprises the following steps: preparing a sodium stearate solution and adding the sodium stearate solution into a 0.01-0.5mol/L surfactant solution according to the mass ratio of 1:1-100 to obtain an emulsion; adding 10-150 parts by mass of propylene bromide into the emulsion to obtain propylene bromide emulsion; dissolving 0.1-8 parts by mass of reducing agent and 10-80 parts by mass of sodium chloride into 100 parts by mass of deionized water to obtain reducing group solution; adding styrene, butadiene, deionized water, a reducing group solution and a surfactant into the propylene bromine emulsion, adding butadiene, stirring, cooling to 25 ℃ in a water bath, and adding an oxidative initiator for polymerization reaction; the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the surface active agent to the propylene bromine emulsion is 20-50: 100-330:100-400:1-10: 10-70:10-100. The lithium ion battery pole piece made of the binder for the lithium ion battery cathode has the advantages of less use amount, difficult powder falling and stripping of the pole piece and long cycle life of the battery.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a binder for a lithium ion battery cathode and a preparation method thereof.
Background
As a new energy product in the 21 st century, a lithium ion battery has the advantages of high capacity density, high discharge voltage, long cycle life, environmental friendliness, wide use temperature range, high safety performance and the like, and is widely applied to the fields of electric tools, smart phones, tablet computers, electric vehicles and the like, particularly the field of electric vehicles.
The lithium ion battery is prepared by uniformly coating positive and negative electrode slurry on corresponding current collectors to prepare pole pieces, and then drying, rolling and winding the pole pieces. The positive electrode slurry and the negative electrode slurry have conductive agent, binding agent and the like besides electrode active substances, wherein the binding agent is an inactive component in the electrode plate of the lithium ion battery, and the main functions of the positive electrode slurry and the negative electrode slurry are to bind the electrode active substances and stabilize the structure of the electrode plate, so that the electrode plate has good mechanical property and processability, and the active substances do not fall off or fall off powder in the charging and discharging process of the battery; another aspect is to enhance the electronic contact between the active material and the conductive agent and current collector. Therefore, the performance of the binder plays a key role in the adhesion of the positive and negative electrode slurry to the current collector. The performance of the adhesive is closely related to the cycle life of the battery, and if the mechanical property of the adhesive is poor, electrode slices are easily pulverized in the electrochemical cycle process, so that electrode materials fall off from the surface of a current collector and the electrochemical energy storage performance is lost; furthermore, when the electrochemical stability of the binder is poor, some functional groups of the binder may undergo irreversible chemical reactions with lithium ions during the charge and discharge of the electrode, thereby causing a decrease in the reversible capacity of the battery. Some adhesives can also affect the lithium ion mobility and the cycle performance, so that the influence of the adhesives on the electrical performance of the battery is reduced, and the adhesives are extremely important for improving the rapid mobility, the stable mobility and the good cycle performance of the battery.
Disclosure of Invention
The invention provides a binder for a lithium ion battery cathode, which provides stronger binding power and conductivity with less dosage when being mixed with sodium carboxymethylcellulose for use, and simultaneously improves the peel strength of a pole piece, effectively reduces the internal resistance of the battery, and improves the cycle performance of the battery.
The technical scheme of the invention is as follows:
a binder for a negative electrode of a lithium ion battery, the binder containing at least one selected from the group consisting of a compound having a structural formula shown in formula 1, a compound having a structural formula shown in formula II, and a compound having a structural formula shown in formula III,
wherein R1, R2 and R3 are respectively a hydrogen atom, a halogen atom, a cyano group, a hydroxyl group, a C1-22 alkyl chain, a C6-12 aromatic group, a C1-20 alkoxy chain, a C1-10 alkanoyl chain and a C1-10 alkanoylamino chain; the n is an integer of 1-120, the m is an integer of 50-2200, the weight average molecular weight of the compound is 30-35 ten thousand, and the number average molecular weight is 20-30 ten thousand.
Another object of the present invention is to provide a method for preparing the binder for a negative electrode of a lithium ion battery, comprising the steps of:
the method comprises the following steps: adding 20-100 parts by mass of stearic acid into a reaction kettle, heating to melt, adding 50-150 parts by mass of 0.1-0.125% NaOH aqueous solution under stirring, and heating in a water bath for 2 hours to obtain a sodium stearate solution;
adding the sodium stearate solution into 0.01-0.5mol/L surfactant solution, wherein the mass ratio of the sodium stearate solution to the surfactant solution is 1: 1-100; heating in water bath to obtain emulsion;
step two: adding 10-150 parts by mass of propylene bromide into the emulsion, and uniformly dispersing to obtain propylene bromide emulsion;
step three: adding 0.1-8 parts by mass of reducing agent and 10-80 parts by mass of sodium chloride into 100-300 parts by mass of deionized water, and dissolving to obtain reducing group solution;
step four: adding styrene, butadiene, deionized water, the reducing group solution and a surfactant into the propylene bromine emulsion prepared in the second step, vacuumizing a reaction kettle, adding butadiene, stirring, cooling to 25 ℃ in a water bath, adding an oxidative initiator, and carrying out polymerization reaction, wherein: the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the surfactant to the propylene bromine emulsion is 20-50: 100-330:100-400:1-10: 10-70:10-100.
Preferably, the surfactant is at least one of sodium dodecyl benzene sulfonate, dodecyl trimethyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride.
Preferably, the reducing agent is at least one of ferrous sulfate, sodium metabisulfite and sodium bisulfite.
Preferably, the oxidative initiator is at least one of potassium persulfate, ammonium persulfate, hydrogen peroxide, and dibenzoyl peroxide.
Preferably, the water bath heating temperature in the first step is 25-65 ℃.
The invention has the beneficial effects that:
when the prepared binder for the lithium ion battery cathode is mixed with sodium carboxymethylcellulose for use, the dosage is small, the addition amount is not more than 1%, so that the pole piece is not easy to fall off, and the binding power is strong; therefore, the binder for the negative electrode of the lithium ion battery reduces the using amount of the binder in the active material coating with the same quality and relatively increases the proportion of the active material, thereby indirectly improving the energy density of a battery system and reducing the internal resistance of the battery. The lithium ion battery pole piece manufactured by using the binder for the lithium ion battery cathode is not easy to fall off and peel in the circulation process, and the cycle life of the battery is long.
Detailed Description
The present invention will be described in detail below. The embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Preparing a binder:
the method comprises the following steps: adding 20 parts by mass of stearic acid into a reaction kettle, heating to be molten, adding 50 parts by mass of 0.1% NaOH aqueous solution under stirring, and heating in a water bath at 25 ℃ for 2 hours to obtain a sodium stearate solution;
adding the sodium stearate solution into a 0.01mol/L sodium dodecyl benzene sulfonate solution, wherein the mass ratio of the sodium stearate solution to the sodium dodecyl benzene sulfonate solution is 1: 1; heating in water bath at 25 deg.C to obtain emulsion;
step two: adding 10 parts by mass of propylene bromide into the emulsion, and uniformly dispersing to obtain propylene bromide emulsion;
step three: adding 0.1 part by mass of reducing agent ferrous sulfate and 10 parts by mass of sodium chloride into 100 parts by mass of deionized water, and dissolving to obtain a reducing group solution;
step four: adding styrene, butadiene, deionized water, the reducing group solution prepared in the third step and a surfactant sodium dodecyl benzene sulfonate into the propylene bromine emulsion prepared in the second step, vacuumizing a reaction kettle, adding butadiene, stirring, cooling the water bath to 25 ℃, and adding an oxidizing initiator potassium persulfate polymerization reaction, namely the binder for the lithium ion battery cathode, wherein: the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the sodium dodecyl benzene sulfonate to the propylene bromide emulsion is 20: 100:100:1:10:10.
Manufacturing a battery negative pole piece:
the active material graphite, the carbon black, the binder prepared in the embodiment and sodium carboxymethyl cellulose (hereinafter referred to as CMC) are mixed according to a mass ratio of 95.7:2:1:1.3, and the process is as follows:
heating 90 parts by mass of deionized water to 25 ℃, adding 1.3 parts by mass of CMC, adding 5 parts by mass of deionized water, and uniformly stirring; then adding 2 parts by mass of conductive carbon black, and uniformly stirring; adding 50 parts by mass of active material graphite and 5 parts by mass of deionized water, and uniformly stirring; and then adding 45.7 parts by mass of graphite and 5 parts by mass of deionized water, uniformly stirring, finally adding 1 part by mass of the binder prepared in the embodiment, uniformly stirring, coating the prepared negative electrode slurry on copper foil, drying and tabletting.
Adhesion test of negative active material to copper foil:
the prepared negative pole piece is randomly cut into a rectangle with the length of 100mm and the width of 10 mm. A stainless steel plate with the width of 30mm is taken, a double-faced adhesive tape (with the width of 12mm) is pasted on the double-faced adhesive tape on the stainless steel plate, and a roller of 2000g is used for pressing 3 times (300mm/min) back and forth on the surface of the stainless steel plate. Bending the pole piece at 180 degrees along the width direction, manually stripping the pole piece for 25mm, fixing the sample on a testing machine to ensure that the stripping surface is consistent with the force line of the testing machine, continuously stripping the pole piece by the testing machine at the speed of 300mm/min to obtain a stripping curve, taking the average value of stable breaking as the stripping force F, and determining the adhesive force of the tested negative pole piece to be F1The results were found to be 100F (N/m) and are shown in table 1.
Manufacturing a lithium ion battery:
the lithium iron phosphate is used as a positive electrode active material, the carbon nano tube is used as a conductive agent, PVDF is used as a binder, and NMP is used as a solvent to prepare a positive electrode plate, the negative electrode plate and the lithium hexafluorophosphate type electrolyte which are prepared in the embodiment, and the 10AH battery soft package laminated battery is assembled and manufactured.
Testing the internal resistance of the battery: the battery obtained above was subjected to a battery internal resistance test using a voltage internal resistance meter, and the results are shown in table 1.
Capacity retention test after 500 cycles: the prepared battery is placed on a charging and discharging cabinet for experiment to carry out normal-temperature charging and discharging cycle test at a multiplying power of 1C, and the test result of the capacity retention rate of the battery after 500 cycles is shown in Table 1.
Example 2
Preparing a binder:
the method comprises the following steps: adding 100 parts by mass of stearic acid into a reaction kettle, heating to be molten, adding 150 parts by mass of 0.125% NaOH aqueous solution under stirring, and heating in a water bath at 65 ℃ for 2 hours to obtain a sodium stearate solution;
adding the sodium stearate solution into a 0.5mol/L dodecyl trimethyl ammonium chloride solution, wherein the mass ratio of the sodium stearate solution to the dodecyl trimethyl ammonium chloride solution is 1: 100; heating in water bath at 65 deg.C to obtain emulsion;
step two: adding 150 parts by mass of propylene bromide into the emulsion, and uniformly dispersing to obtain propylene bromide emulsion;
step three: adding 8 parts by mass of reducing agent sodium metabisulfite and 80 parts by mass of sodium chloride into 300 parts by mass of deionized water, and dissolving to obtain a reducing group solution;
step four: adding styrene, butadiene, deionized water, the reducing group solution prepared in the third step and a surfactant dodecyl trimethyl ammonium chloride into the propylene bromine emulsion prepared in the second step, vacuumizing a reaction kettle, adding butadiene, stirring, cooling to 25 ℃ in a water bath, and adding an oxidative initiator ammonium persulfate polymerization reaction, namely the binder for the lithium ion battery cathode, wherein: the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the sodium dodecyl benzene sulfonate to the propylene bromide emulsion is 20: 330:400:10:70:100.
Manufacturing a battery negative pole piece:
the negative electrode plate of the lithium ion battery is prepared by using the binder prepared in the embodiment according to the method in the embodiment 1, except that graphite, carbon black, the binder prepared in the embodiment and CMC are mixed according to the mass ratio of 96.2:1:1: 1.3.
Adhesion test of negative active material to copper foil:
the adhesion of the negative electrode sheet to the copper foil was tested in the same manner as in example 1.
Manufacturing a battery:
a lithium ion battery was produced in the same manner as in example 1, and the internal resistance of the battery and the capacity retention rate after 500 cycles of the battery were measured, and the results are shown in table 1.
Example 3
Preparing a binder:
the method comprises the following steps: adding 100 parts by mass of stearic acid into a reaction kettle, heating to be molten, adding 50 parts by mass of 0.125% NaOH aqueous solution under stirring, and heating in a water bath at 45 ℃ for 2 hours to obtain a sodium stearate solution;
adding the sodium stearate solution into a 0.1mol/L dodecyl dimethyl benzyl ammonium chloride solution, wherein the mass ratio of the sodium stearate solution to the dodecyl dimethyl benzyl ammonium chloride solution is 1: 50; heating in water bath at 45 deg.C to obtain emulsion;
step two: adding 50 parts by mass of propylene bromide into the emulsion, and uniformly dispersing to obtain propylene bromide emulsion;
step three: adding 6 parts by mass of reducing agent sodium bisulfite and 40 parts by mass of sodium chloride into 300 parts by mass of deionized water, and dissolving to obtain a reducing group solution;
step four: adding styrene, butadiene, deionized water, the reducing base solution prepared in the third step and a surfactant dodecyl dimethyl benzyl ammonium chloride into the propylene bromide emulsion prepared in the second step, vacuumizing a reaction kettle, adding butadiene, stirring, cooling the water bath to 25 ℃, and adding an oxidative initiator, namely a hydrogen peroxide polymerization reaction, namely the binder for the negative electrode of the lithium ion battery, wherein: the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the sodium dodecyl benzene sulfonate to the propylene bromide emulsion is 50: 200:300:10:50:100.
Manufacturing a battery negative pole piece:
the negative electrode plate of the lithium ion battery is prepared by using the binder prepared in the embodiment according to the method in the embodiment 1, except that graphite, carbon black, the binder prepared in the embodiment and CMC are mixed according to the mass ratio of 96.9:1:0.8: 1.3.
Adhesion test of negative active material to copper foil:
the adhesion of the negative electrode sheet to the copper foil was tested in the same manner as in example 1.
Manufacturing a battery:
a lithium ion battery was produced in the same manner as in example 1, and the internal resistance of the battery and the capacity retention rate after 500 cycles of the battery were measured, and the results are shown in table 1.
Example 4
Preparing a binder:
the method comprises the following steps: adding 30 parts by mass of stearic acid into a reaction kettle, heating to be molten, adding 50 parts by mass of 0.125% NaOH aqueous solution under stirring, and heating in a water bath at 45 ℃ for 2 hours to obtain a sodium stearate solution;
adding the sodium stearate solution into a 0.1mol/L dodecyl dimethyl benzyl ammonium chloride solution, wherein the mass ratio of the sodium stearate solution to the dodecyl dimethyl benzyl ammonium chloride solution is 1: 50; heating in water bath at 45 deg.C to obtain emulsion;
step two: adding 50 parts by mass of propylene bromide into the emulsion, and uniformly dispersing to obtain propylene bromide emulsion;
step three: adding 6 parts by mass of reducing agent sodium bisulfite and 40 parts by mass of sodium chloride into 300 parts by mass of deionized water, and dissolving to obtain a reducing group solution;
step four: adding styrene, butadiene, deionized water, the reducing base solution prepared in the third step and a surfactant dodecyl dimethyl benzyl ammonium chloride into the propylene bromide emulsion prepared in the second step, vacuumizing a reaction kettle, adding butadiene, stirring, cooling the water bath to 25 ℃, and adding an oxidative initiator, namely a dibenzoyl peroxide polymerization reaction, namely the binder for the negative electrode of the lithium ion battery, wherein: the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the sodium dodecyl benzene sulfonate to the propylene bromide emulsion is 50: 300:300:10:50:100.
Manufacturing a battery negative pole piece:
the negative electrode plate of the lithium ion battery is prepared by using the binder prepared in the embodiment according to the method in the embodiment 1, except that the graphite, the carbon black, the binder prepared in the embodiment and the CMC are mixed according to the mass ratio of 96.7:1:1: 1.3.
Adhesion test of negative active material to copper foil:
the adhesion of the negative electrode sheet to the copper foil was tested in the same manner as in example 1.
Manufacturing a battery:
a lithium ion battery was produced in the same manner as in example 1, and the internal resistance of the battery and the capacity retention rate after 500 cycles of the battery were measured, and the results are shown in table 1.
Comparative example 1
Mixing graphite, carbon black, styrene butadiene rubber and sodium carboxymethylcellulose according to a mass ratio of 95.7:1:2:1.3, wherein the process comprises the following steps:
heating 90 parts by mass of deionized water to 25 ℃, adding 1.3 parts by mass of CMC, adding 5 parts by mass of deionized water, and uniformly stirring; then adding 1 part by mass of carbon black, and uniformly stirring; adding 50 parts of graphite and 5 parts of deionized water by mass, and uniformly stirring; and adding 45.7 parts by mass of graphite and 5 parts by mass of deionized water, uniformly stirring, finally adding 2 parts by mass of styrene butadiene rubber, uniformly stirring, coating the prepared negative electrode slurry on copper foil, drying and tabletting.
The adhesion between the negative electrode sheet and the copper foil was measured in the same manner as in example 1, and the results are shown in Table 1
The same method as in example 1 was used to fabricate a battery, and the results of testing the internal resistance of the battery and the capacity retention rate of the battery after 500 cycles are shown in table 1.
TABLE 1
From table 1, it can be seen that the propenyl modified SBR binder prepared by the present invention is applied to a lithium ion battery, such that the peel strength of a pole piece is significantly improved, the internal resistance of the battery is also significantly reduced, and the cycle performance of the battery is significantly improved. In addition, the negative electrode binder disclosed by the invention is small in usage amount and strong in binding power, so that the usage amount of the binder can be reduced and the strong binding power can be achieved, and therefore, more active substances can be used for negative electrode plates with the same weight, and the energy density of a battery is improved; while the internal resistance of the battery decreases.
The above embodiments of the present invention are merely examples for illustrating the principles of the present invention and are not to be construed as limiting the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (6)
1. A binder for a negative electrode of a lithium ion battery, characterized in that the binder contains at least one selected from the group consisting of a compound having a structural formula shown in formula 1, a compound having a structural formula shown in formula II, and a compound having a structural formula shown in formula III,
wherein, R is1、R2、R3Are respectively hydrogen atom, halogen atom, cyano, hydroxyl and C1-C22Alkyl chain, C6-C12Aryl radical, C1-C20Alkoxy chain, C1-C10Alkanoyl chain, C1-C10An alkanoylamino chain; the n is an integer of 1-120, the m is an integer of 50-2200, the weight average molecular weight of the compound is 30-35 ten thousand, and the number average molecular weight is 20-30 ten thousand.
2. The method for preparing the binder for a negative electrode of a lithium ion battery according to claim 1, comprising the steps of:
the method comprises the following steps: adding 20-100 parts by mass of stearic acid into a reaction kettle, heating to melt, adding 50-150 parts by mass of 0.1-0.125% NaOH aqueous solution under stirring, and heating in a water bath for 2 hours to obtain a sodium stearate solution;
adding the sodium stearate solution into 0.01-0.5mol/L surfactant solution, wherein the mass ratio of the sodium stearate solution to the surfactant solution is 1: 1-100; heating in water bath to obtain emulsion;
step two: adding 10-150 parts by mass of propylene bromide into the emulsion, and uniformly dispersing to obtain propylene bromide emulsion;
step three: adding 0.1-8 parts by mass of reducing agent and 10-80 parts by mass of sodium chloride into 100-300 parts by mass of deionized water, and dissolving to obtain reducing group solution;
step four: adding styrene, butadiene, deionized water, the reducing group solution and a surfactant into the propylene bromine emulsion prepared in the second step, vacuumizing a reaction kettle, adding butadiene, stirring, cooling to 25 ℃ in a water bath, adding an oxidative initiator, and carrying out polymerization reaction, wherein: the mass ratio of the styrene to the butadiene to the deionized water to the reducing group solution to the surfactant to the propylene bromine emulsion is 20-50: 100-330:100-400:1-10: 10-70:10-100.
3. The method of claim 2, wherein the surfactant is at least one of sodium dodecylbenzenesulfonate, dodecyltrimethylammonium chloride, and dodecyldimethylbenzylammonium chloride.
4. The method of claim 2, wherein the reducing agent is at least one of ferrous sulfate, sodium metabisulfite, and sodium bisulfite.
5. The method of preparing the binder for a negative electrode of a lithium ion battery according to claim 2, wherein the oxidative initiator is at least one of potassium persulfate, ammonium persulfate, hydrogen peroxide, and dibenzoyl peroxide.
6. The method for preparing the binder for the negative electrode of the lithium ion battery according to claim 2, wherein the water bath heating temperature in the first step is 25 ℃ to 65 ℃.
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| CN113258068A (en) * | 2021-04-28 | 2021-08-13 | 东莞市创明电池技术有限公司 | Binder for silicon negative electrode of lithium ion battery, negative electrode slurry and preparation method of negative electrode slurry |
| CN117133921A (en) * | 2023-10-26 | 2023-11-28 | 中自环保科技股份有限公司 | Sodium ion battery negative electrode slurry, pole piece and pole piece preparation method |
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| CN108598482A (en) * | 2018-04-02 | 2018-09-28 | 合肥国轩高科动力能源有限公司 | A kind of carbon black modified water system SBR lithium ion battery binders and preparation method thereof |
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Application publication date: 20191220 |