CN117393759A - Battery binder, positive electrode material, positive electrode and battery - Google Patents

Battery binder, positive electrode material, positive electrode and battery Download PDF

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Publication number
CN117393759A
CN117393759A CN202311252186.5A CN202311252186A CN117393759A CN 117393759 A CN117393759 A CN 117393759A CN 202311252186 A CN202311252186 A CN 202311252186A CN 117393759 A CN117393759 A CN 117393759A
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acrylate
conductive polymer
battery
vinyl
positive electrode
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Inventor
孙永勤
董海军
陈辉
牛凇桥
邹庚
吕楠
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Honeycomb Energy Technology Yancheng Co ltd
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Honeycomb Energy Technology Yancheng Co ltd
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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
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
    • C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
    • 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
    • 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
    • H01M4/624—Electric conductive fillers

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The invention relates to the field of batteries, in particular to a battery binder, a positive electrode material, a positive electrode and a battery. The battery binder provided by the invention comprises a conductive polymer A and another conductive polymer B; the conductive polymer A is polymerized from a monomer composition comprising acrylonitrile, an alkyl acrylate monomer, vinyl pyrrolidone and vinyl polyether; the conductive polymer B is a conductive polymer containing hydroxyl; the battery binder obtained by combining the conductive polymer A and the conductive polymer B can improve the processing performance of the battery, such as the peeling strength and the slurry stability, and can improve the electrochemical performance of the battery, such as the reduction of the internal resistance of the battery and the prolongation of the cycle life.

Description

Battery binder, positive electrode material, positive electrode and battery
Technical Field
The invention relates to the field of batteries, in particular to a battery binder, a positive electrode material, a positive electrode and a battery.
Background
Lithium ion batteries have been widely used in the fields of portable electronic devices, electric vehicles, renewable energy storage, and the like, because of their advantages such as high energy density, long cycle life, low self-discharge rate, and the like. The main components of the lithium ion battery comprise a positive electrode, a negative electrode, an electrolyte and a diaphragm. In the electrode preparation process, a binder is a key constituent component that tightly adheres the active material, the conductive agent and other additives to the current collector, thereby ensuring structural stability and good electrical contact of the electrode.
Conventional lithium ion battery binders, such as PVDF, although having a certain adhesion, have disadvantages in terms of conductivity, slurry stability, etc., thereby affecting the performance of the battery. For example, chinese patent No. CN115663117a provides a method for improving the stability of PVDF slurry, but has limited effect. Polymer or small molecule dispersants are often added in the prior industry to aid in slurry dispersion, but slurry stability is still inadequate. Similarly, the chinese patent No. CN109755579B provides polyvinylidene fluoride as a matrix, and the carboxylated carbon nanotubes are blended by solution to form a MWCNTs/PVDF composite suspension, but the carbon nanotubes are still difficult to disperse, which increases the interfacial resistance of the binder and the conductive agent.
In recent years, researchers have been focusing on the use of conductive polymers as binders to improve the performance of lithium ion batteries. The conductive polymer such as polyaniline, poly (3, 4-ethylenedioxythiophene), polypyrrole and the like has good conductive performance, and is expected to improve the conductivity of the electrode and reduce the internal resistance. However, the adhesion and paste stability of the conductive polymer itself are often not satisfactory. Accordingly, researchers have attempted to combine conductive polymers with other polymeric materials to achieve overall optimization of the properties of the binder. In addition, as the size of lithium iron phosphate particles of the positive electrode material of the lithium ion battery is reduced to the nanometer level, the problem of dispersibility becomes more remarkable. The nanoscale lithium iron phosphate particles are easy to agglomerate, so that the non-uniformity of the electrode plate and the performance of the battery are reduced. Therefore, it is important to develop a binder capable of effectively improving the dispersibility of the positive electrode material, especially nano-sized lithium iron phosphate particles, to reduce the internal resistance of the battery and to extend the cycle life.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a battery binder which not only has good adhesion, conductivity, and slurry stability, but also can effectively improve dispersibility of a positive electrode material, particularly nano-sized lithium iron phosphate particles, to reduce internal resistance of a battery and extend cycle life, and further to provide a positive electrode material, a positive electrode, and a battery including the positive electrode binder.
The invention provides a battery binder, which comprises a conductive polymer A and another conductive polymer B; the conductive polymer A is polymerized from a monomer composition comprising acrylonitrile, alkyl acrylate monomers, vinyl pyrrolidone and vinyl polyether.
The term another conductive polymer B refers to a conductive polymer that is structurally different from conductive polymer a.
Further, the battery binder comprises 70-80 parts of conductive polymer A and 20-30 parts of conductive polymer B in parts by weight.
Preferably, the battery binder contains 75 parts of conductive polymer a and 25 parts of conductive polymer B in parts by weight.
Further, the conductive polymer B is a conductive polymer containing hydroxyl groups; preferably, the conductive polymer B is a polymer formed by polymerizing a 6-to 10-membered aromatic ring containing 1-4 hydroxyl groups or a 5-to 10-membered heteroaromatic ring containing 1-4 hetero atoms selected from at least one of N, O, S, P, and more preferably, the conductive polymer B is one or more selected from the polymers shown in the formulas I, II and III;
further, the alkyl acrylate monomer is alkyl acrylate or alkyl methacrylate; preferably, the alkyl acrylate monomer is methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, nonyl acrylate, decyl acrylate, undecyl acrylate, lauryl acrylate, tridecyl acrylate, tetradecyl acrylate, pentadecyl acrylate, hexadecyl acrylate, heptadecyl acrylate, octadecyl acrylate, phenyl acrylate, benzyl acrylate, p-aminophenyl acrylate, cyclohexyl acrylate, isostearyl acrylate, methylcyclohexyl acrylate, furfuryl acrylate, methacrylate, thioethyl acrylate, silane acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, 2-hydroxy-1-propanoate, 2' -dihydroxy-1, 3-dihydroxypropanoate, 2-hydroxy-propanoate, 2-hydroxy-62-methyl acrylate, or methyl-2-hydroxy-62-methyl acrylate, wherein the hydroxy-2-methyl acrylate is substituted with one or more than one or more of the above monomers.
Further, the vinyl polyether comprises one or more of vinyl polyoxyethylene ether, vinyl polyoxypropylene ether and vinyl polyoxyethylene polyoxypropylene ether; and/or the battery binder further comprises 40-60wt% of a solvent.
The solvent is a solvent conventional in the art, such as NMP.
Further, the battery binder comprises 35-40% of conductive polymer A, 10-15% of conductive polymer B and 40-60% of solvent by taking the total mass of the battery binder as 100%.
Further, in the monomer composition, the molar ratio of acrylonitrile, alkyl acrylate monomer, vinyl pyrrolidone and vinyl polyether is 60 to 80:10-30:5-15:5-10; and/or, the monomer composition comprises 60-80 parts of acrylonitrile, 10-30 parts of n-butyl acrylate or lauryl acrylate, 5-15 parts of vinyl pyrrolidone and 5-10 parts of vinyl polyoxyethylene ether or vinyl polyoxypropylene ether according to mole parts.
Further, the preparation method of the conductive polymer A comprises the following steps:
mixing the components of the monomer composition with a dispersion medium and an emulsifier, heating to a first polymerization temperature, adding 55-65% of an initiator for polymerization reaction, heating to a second polymerization temperature, and adding the rest of the initiator for polymerization reaction; preferably, the first polymerization temperature is 74-78 ℃, and the second polymerization temperature is 80-83 ℃; preferably, the dispersion medium is one or more of water, ethanol, acetone, diethyl ether and methanol; preferably, the emulsifier is one or more of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate; preferably, the initiator is selected from one or more of potassium persulfate and sodium persulfate; preferably, the mass ratio of the monomer composition, the dispersion medium, the emulsifier and the initiator is 60-200:200-300:15-25:200-250.
The invention also provides a positive electrode material, which comprises any one of the battery binders. Wherein the active material of the positive electrode material is lithium iron phosphate.
The invention also provides a positive electrode which is characterized by comprising the positive electrode material.
The invention also provides a battery which is characterized by comprising the positive electrode.
The technical scheme of the invention has the following advantages:
1. the battery binder provided by the invention comprises a conductive polymer A and another conductive polymer B; the conductive polymer A is polymerized from a monomer composition comprising acrylonitrile, an alkyl acrylate monomer, vinyl pyrrolidone and vinyl polyether; the conductive polymer B is a conductive polymer containing hydroxyl; the battery binder obtained by combining the conductive polymer A and the conductive polymer B can improve the processing performance of the battery, such as the peeling strength and the slurry stability, and can improve the electrochemical performance of the battery, such as the reduction of the internal resistance of the battery and the prolongation of the cycle life.
Wherein the acrylonitrile and (meth) acrylic acid (ester) structural units provide excellent peel strength, the vinyl pyrrolidone and vinyl polyether structural units provide good slurry dispersion stability, and the conductive polymer B improves the conductive performance of the adhesive. The application of the adhesive in the battery can obviously improve the comprehensive performance of the battery.
2. The battery binder provided by the invention has higher cycling stability when the conductive polymer B is selected from hydroxylated poly (3, 4-ethylenedioxythiophene) than other polymers.
3. According to the battery binder provided by the invention, 70-80 parts of conductive polymer A and 20-30 parts of conductive polymer B are contained in parts by weight, and the circulation stability of the battery can be further improved by combining the conductive polymer A with the conductive polymer B in a specific proportion.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge. The vinyl pyrrolidone is N-vinyl pyrrolidone.
Example 1
The embodiment provides a battery binder and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) 90g of deionized water and 20.2g of sodium dodecyl sulfate are added into a reaction kettle, nitrogen is introduced to replace oxygen for 30min, and the flow rate of the nitrogen is controlled to be 4m 3 And/h, starting water bath heating and stirring, wherein the stirring speed is 200rpm; the remaining 180g of deionized water, 37.1g of acrylonitrile, 23.2g of n-butyl acrylate, 11.1g of vinylpyrrolidone, 112.4g of vinyl polyoxyethylene ether (from source leaf, weight average molecular weight: 1338) were stirred uniformly during the temperature rise, and added to a dropping funnel. When the temperature in the kettle reached 74 ℃, 142.8g of sodium persulfate was added dropwise for 4 hours. After the completion of the dropwise addition, the temperature was raised to 80℃and the remaining 95.2g of sodium persulfate was added and stirring was continued for 5 hours. And drying the synthesized emulsion by adopting a spray dryer to prepare powder, thus obtaining the adhesive PA1.
(2) 35g of binder PA1 and 15g of hydroxylated poly (3, 4-ethylenedioxythiophene) (from the source leaf, hydroxyl number: 23.5, weight average molecular weight: 7000) were added to 50g of NMP and stirred at room temperature for 4 hours to prepare conductive binder dope PC1.
Example 2
This example provides a battery binder and a method for preparing the same, which is substantially the same as example 1, except that "37.1g of acrylonitrile, 23.2g of n-butyl acrylate" of example 1 was adjusted to "34.5g of acrylonitrile, 29.0g of n-butyl acrylate".
Example 3
This example provides a battery binder and method of making the same as example 1, except that 35g of binder PA1 and 15g of hydroxylated poly (3, 4-ethylenedioxythiophene) of example 1 are adjusted to 37.5g of binder PA1 and 12.5g of hydroxylated poly (3, 4-ethylenedioxythiophene), namely 75:25 and a hydroxylated poly (3, 4-ethylenedioxythiophene).
Example 4
This example provides a battery binder and a method of making the same as example 1, except that n-butyl acrylate from example 1 was replaced with equal quality lauryl acrylate.
Example 5
This example provides a battery binder and a method for preparing the same, which is substantially the same as example 1, except that "37.1g of acrylonitrile, 23.2g of n-butyl acrylate" of example 1 was adjusted to "31.8g of acrylonitrile, 34.8g of n-butyl acrylate".
Example 6
This example provides a battery binder and a method of preparing the same, except that the vinyl polyoxyethylene ether of example 1 was replaced with a vinyl polyoxypropylene ether of the same mass (available from microphone, molecular weight: 2400).
Example 7
This example provides a battery binder and method of making the same as example 1, except that the hydroxylated poly (3, 4-ethylenedioxythiophene) ether of example 1 is replaced with a homogenous mass of hydroxylated polyaniline (available from Adamas, weight average molecular weight: 18000).
Example 8
This example provides a battery binder and method of making the same as example 1, except that the hydroxylated poly (3, 4-ethylenedioxythiophene) of example 1 is replaced with a homogenous mass of hydroxylated polypyrrole (available from Allatin, weight average molecular weight: 4372).
Example 9
This example provides a battery binder and a method of making the same, except that in step (2) '15 g of hydroxylated poly (3, 4-ethylenedioxythiophene)' was replaced with '15 g of poly (3, 4-ethylenedioxythiophene)' (available from Ala-dine, weight average molecular weight: 2559).
Comparative example 1
This comparative example provides a battery binder and a method for preparing the same, which is substantially the same as example 1, except that 11.1g of vinylpyrrolidone and 112.4g of vinyl polyoxyethylene ether are not added in step (1).
Comparative example 2
This comparative example provides a battery binder and a method for preparing the same, substantially as in example 1, except that 11.1g of vinylpyrrolidone was not added in step (1).
Comparative example 3
This comparative example provides a battery binder and a method for preparing the same, which is substantially the same as example 1, except that 112.4g of vinyl polyoxyethylene ether was not added in step (1).
Comparative example 4
This example provides a battery binder and a method of making the same as example 1, except that in step (2) 35g of binder PA1 and 15g of hydroxylated poly (3, 4-ethylenedioxythiophene) were replaced with "50g of binder PA1", i.e., no hydroxylated poly (3, 4-ethylenedioxythiophene) was added.
Experimental example 1
The battery binder prepared in each example and comparative example was prepared as follows, and lithium iron phosphate (LFP), graphite (SP), multi-walled carbon nanotubes (MWCNT) and the battery binder were mixed in a mass ratio of 94:2:1:3 to prepare a positive electrode slurry. The positive electrode slurry was prepared at a concentration of (23.0.+ -. 0.3) mg/cm 2 The single-sided surface density of the aluminum current collector is coated on the surface of the aluminum current collector, and the positive plate is prepared by drying and rolling.
And respectively testing the pole piece resistivity, the direct current resistance (DCIR) and the cyclic charge and discharge performance of each group of positive pole pieces. The manufacturing, activating and testing method of the soft package battery comprises the following steps:
graphite, conductive carbon black and thickener CMC are mixed according to the mass ratio of 96.5:1.5:2, mixing to obtain a negative electrode slurry of (8.5.+ -. 0.3) mg/cm 2 The single-sided surface density of the aluminum alloy is coated on a copper foil current collector, and the aluminum alloy is dried and rolled to prepare the negative plate.
The positive plate, the negative plate and the diaphragm are manufactured into a soft package battery by lamination process, the capacity is 1400mAh, and the electrolyte (the components and the LiPF with the content of each component of 1mol/L are injected 6 Dissolved in DEC, DMC, ec=1: 1:1 (volume ratio), the battery is completed. The soft package battery is formed in a hot-pressing mode, the formation temperature is 80 ℃, the formation pressure is 450kgf, the soft package battery is pre-charged to 3.65V with small current of 0.5 ℃, and then the battery after being activated is obtained through cold press shaping, and the battery is subjected to charge-discharge performance and cycle performance test.
Charge and discharge performance: using the standard HPPC test method, the charge-discharge Direct Current Internal Resistance (DCIR) at different SOCs was measured, mainly evaluating the charge-discharge DCIR at 50% SOC state.
And (3) normal temperature cyclic test: charging to 4.2V at 25 ℃ with a constant current of 1C, charging to 0.05C with a constant voltage of 4.2V, and discharging the battery to 2.8V with a constant current of 1C; the discharge capacity was designated as C1, and the charge-discharge process was repeated for 200 weeks to obtain an nth-week discharge capacity CN with a capacity retention=cn/C1 of 100%, and the obtained results are shown in table 1.
TABLE 1 resistance and electrical property test results
As can be seen from the results of the above table, compared with comparative examples 1 to 4, the pole piece resistance and the direct current resistance measured in each example of the present invention are significantly reduced, the cycle life is significantly improved, and the monomer composition comprising acrylonitrile, alkyl acrylate monomer, vinyl pyrrolidone and vinyl polyether and the conductive polymer B exert a synergistic effect.
Examples 1 to 6 compared with examples 7 and 8 show that the electrode binder obtained by using the conductive polymer A of the present invention in combination with the hydroxylated poly (3, 4-ethylenedioxythiophene) ether as the conductive polymer can better reduce the resistance and prolong the cycle life when used in a battery.
Example 5 it is understood that the electrode binder obtained by optimizing the ratio of each monomer in example 5 can be used for a battery with a better reduction in resistance and an increase in cycle life, as compared with examples 1 and 2.
As is clear from comparison of example 1 and example 4, example 1 and example 6, the electrode binder of the present invention obtained by optimizing the structure of each monomer (preferably, using lauryl acrylate as the alkyl acrylate monomer and vinyl polyoxypropylene ether as the vinyl polyether monomer) can be used for a battery with a better reduction in resistance and an increase in cycle life.
Experimental example 2
The peel strength of the positive electrode sheets produced from the battery binders of examples 1 to 9 and comparative example 1 was measured, and the test method was as follows: the positive plate is manufactured according to the method of the experimental example 1, the adhesive tape is attached to the positive plate, one end of the positive plate is fixed at one end of the tensile machine, the adhesive tape is torn at 180 degrees from the other end, the test speed is 150-200 mm/min, the value obtained by dividing the average tensile value after the stripping by the width of the adhesive tape is the stripping strength, and the test result is shown in the following table.
Softness test method and criteria: the pole piece is placed on the tabletop, one end of the pole piece extends out of the tabletop by 5-8 cm, the sagging degree is observed, and the more sagging represents the better softness. Of these, the more ∈ represents the better its softness.
TABLE 2 peel strength and softness test results
Project Softness Peel strength/(N/m)
Example 1 ★★★ 10.8
Example 2 ★★★★ 9.5
Example 3 ★★ 12.5
Example 4 ★★★ 10.2
Example 5 ★★★★★ 13.1
Example 6 ★★ 12.2
Example 7 ★ 11.2
Example 8 ★★★★ 9.8
Example 9 ★★★ 10.5
Comparative example 1 ★ 7.5
As is clear from the results of the table, the pole piece measured in each example of the present invention has significantly improved peel strength, and flexibility other than that of example 7 is significantly improved, thus having excellent processability.
Experimental example 3
The battery binders of examples 1 to 9 and comparative example 1 were measured, and the initial viscosity (cp) at 25℃and the viscosity (cp) after 24 hours were measured using a digital viscometer, and the test results are shown in Table 3.
TABLE 3 results of viscosity test
In practical work, the battery binder is better controlled to 2800-5000 mPas in 0h viscosity, which is beneficial to the stabilization of the density of the coating surface, and 24h viscosity is within 7000 mPas, which is beneficial to the continuous coating processing after a period of stagnation. From the results of the above table, it is clear that the battery binders obtained in the examples of the present invention are excellent in processability.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (10)

1. A battery binder comprising a conductive polymer a and another conductive polymer B; the conductive polymer A is polymerized from a monomer composition comprising acrylonitrile, alkyl acrylate monomers, vinyl pyrrolidone and vinyl polyether.
2. The battery binder according to claim 1, wherein the battery binder comprises 70-80 parts by weight of the conductive polymer a and 20-30 parts by weight of the conductive polymer B.
3. The battery binder according to claim 1 or 2, wherein the conductive polymer B is a hydroxyl group-containing conductive polymer; preferably, the conductive polymer B is a polymer formed by polymerizing a 6-to 10-membered aromatic ring containing 1-4 hydroxyl groups or a 5-to 10-membered heteroaromatic ring containing 1-4 hetero atoms selected from at least one of N, O, S, P, and more preferably, the conductive polymer B is one or more selected from the polymers shown in the formulas I, II and III;
4. the battery binder of any one of claims 1-3, wherein the alkyl acrylate monomer is an alkyl acrylate or an alkyl methacrylate; preferably, the alkyl acrylate monomer is methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, pentyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, nonyl acrylate, decyl acrylate, undecyl acrylate, lauryl acrylate, tridecyl acrylate, tetradecyl acrylate, pentadecyl acrylate, hexadecyl acrylate, heptadecyl acrylate, octadecyl acrylate, phenyl acrylate, benzyl acrylate, p-aminophenyl acrylate, cyclohexyl acrylate, isostearyl acrylate, methylcyclohexyl acrylate, furfuryl acrylate, methacrylate, thioethyl acrylate, silane acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, 2-hydroxy-1-propanoate, 2' -dihydroxy-1, 3-dihydroxypropanoate, 2-hydroxy-propanoate, 2-hydroxy-62-methyl acrylate, or methyl-2-hydroxy-62-methyl acrylate, wherein the hydroxy-2-methyl acrylate is substituted with one or more than one or more of the above monomers.
5. The battery binder of any one of claims 1-4, wherein the vinyl polyether comprises one or more of vinyl polyoxyethylene ether, vinyl polyoxypropylene ether, vinyl polyoxyethylene polyoxypropylene ether; and/or the battery binder further comprises 40-60wt% of a solvent.
6. The battery binder according to any one of claims 1 to 5, wherein in the monomer composition, the molar ratio of acrylonitrile, alkyl acrylate monomer, vinyl pyrrolidone and vinyl polyether is 60 to 80:10-30:5-15:5-10; and/or, the monomer composition comprises 60-80 parts of acrylonitrile, 10-30 parts of n-butyl acrylate or lauryl acrylate, 5-15 parts of vinyl pyrrolidone and 5-10 parts of vinyl polyoxyethylene ether or vinyl polyoxypropylene ether according to mole parts.
7. The battery binder according to any one of claims 1 to 6, wherein the preparation method of the conductive polymer a comprises:
mixing the components of the monomer composition with a dispersion medium and an emulsifier, heating to a first polymerization temperature, adding 55-65% of an initiator for polymerization reaction, heating to a second polymerization temperature, and adding the rest of the initiator for polymerization reaction;
preferably, the first polymerization temperature is 74-78 ℃, and the second polymerization temperature is 80-83 ℃; preferably, the dispersion medium is one or more of water, ethanol, acetone, diethyl ether and methanol; preferably, the emulsifier is one or more of sodium dodecyl sulfate and sodium dodecyl benzene sulfonate; preferably, the initiator is selected from one or more of potassium persulfate and sodium persulfate; preferably, the mass ratio of the monomer composition, the dispersion medium, the emulsifier and the initiator is 60-200:200-300:15-25:200-250.
8. A positive electrode material, characterized in that the positive electrode material comprises the battery binder according to any one of claims 1 to 7.
9. A positive electrode comprising the positive electrode material according to claim 8.
10. A battery comprising the positive electrode of claim 9.
CN202311252186.5A 2023-09-26 2023-09-26 Battery binder, positive electrode material, positive electrode and battery Pending CN117393759A (en)

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