CN114784451B - Lithium ion battery diaphragm slurry, preparation method thereof and lithium ion battery composite diaphragm - Google Patents
Lithium ion battery diaphragm slurry, preparation method thereof and lithium ion battery composite diaphragm Download PDFInfo
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- CN114784451B CN114784451B CN202210454182.4A CN202210454182A CN114784451B CN 114784451 B CN114784451 B CN 114784451B CN 202210454182 A CN202210454182 A CN 202210454182A CN 114784451 B CN114784451 B CN 114784451B
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/423—Polyamide resins
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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
- 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
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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
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Abstract
The application discloses lithium ion battery diaphragm slurry and a preparation method thereof, and a lithium ion battery composite diaphragm, wherein the lithium ion battery composite diaphragm comprises composite adsorbing material powder, dispersing agent, deionized water, a binder and a surfactant, the weight ratio of the composite adsorbing material powder to the dispersing agent to the deionized water to the binder to the surfactant is 1:0.001-0.005:2.9-6.8:0.1-0.4:0.004-0.007, and the composite adsorbing material powder comprises nonmetallic minerals, acrylamide monomers, an initiator and the deionized water, and the mass ratio of the nonmetallic minerals, the acrylamide monomers, the initiator and the deionized water is 1:0.15-0.45:0.01-0.05:10-50. According to the application, the polyacrylamide/nonmetallic mineral composite material is used as the functional coating of the lithium ion battery composite membrane, so that the prepared composite coating membrane can effectively capture heavy metal ions dissolved out of the battery, the SEI membrane is reduced or the membrane is punctured by the metal ions separated out from the negative electrode, and the cycle performance and the safety performance of the battery are improved.
Description
Technical Field
The invention relates to the technical field of lithium ion battery materials, in particular to lithium ion battery diaphragm slurry, a preparation method thereof and a lithium ion battery composite diaphragm.
Background
Along with the continuous development of science and technology and the progress of society, the energy crisis is deepened gradually, the environmental awareness of people is continuously increased, and new energy and environmental-friendly low-carbon electric automobile industry are rapidly developed. The lithium ion battery has long cycle life and high energy ratio, can be charged without pollution, and is a key technology for solving the problems of low carbonization, cleaning and high efficiency of an energy system.
The lithium ion battery can have the phenomenon of transition metal element dissolution in the use process, particularly when the lithium ion battery is charged and discharged at high temperature or high voltage, electrolyte of the lithium ion battery is easy to decompose to generate HF, the HF can corrode a positive electrode material, the positive electrode material is caused to aggravate dissolution transition metal ions Ni, mn and Co, the dissolved transition metal element can migrate to the surface of a negative electrode, an SEI film is destroyed or separated out, the irreversible decline of the battery capacity is caused, or a battery diaphragm is pierced, and the capacity, the cycle service life and the self-discharge performance of the lithium ion battery are influenced. The lithium ion battery composite diaphragm is positioned between the anode and the cathode of the lithium ion battery and is an electronic insulator, and meanwhile, ions are allowed to freely migrate to realize reversible 'intercalation' and 'deintercalation' reactions. Therefore, from the view point of diaphragm design, fully adsorbing transition metal ions dissolved out from the interior of a lithium ion battery becomes an effective means for improving the cycle performance and the safety performance of the battery. At present, commercial lithium ion batteries still mainly comprise polyolefin diaphragms or ceramic diaphragms, and can not effectively adsorb metal ions.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a lithium ion battery diaphragm slurry, a preparation method thereof and a lithium ion battery composite diaphragm.
The invention discloses a lithium ion battery diaphragm slurry, which comprises the following components:
The composite adsorbing material comprises, by weight, 1:0.001-0.005:2.9-6.8:0.1-0.4:0.004-0.007, wherein the weight ratio of the composite adsorbing material powder to the dispersing agent is 1:0.001-0.005:2.9-6.8:0.004;
The composite adsorption material powder comprises nonmetallic minerals, acrylamide monomers, an initiator and deionized water, wherein the mass ratio of the nonmetallic minerals, the acrylamide monomers, the initiator and the deionized water is 1:0.15-0.45:0.01-0.05:10-50.
According to an embodiment of the present invention, the nonmetallic mineral is one or more of diatomaceous earth, zeolite, sepiolite, attapulgite, and montmorillonite.
According to one embodiment of the invention, the nonmetallic mineral is an attapulgite with a one-dimensional nanorod structure and an internally connected micro-nano pore structure, and the particle size of the attapulgite is 400-1000 nm.
According to one embodiment of the invention, the initiator is azobisisobutyronitrile or potassium persulfate.
According to one embodiment of the invention, the dispersing agent is one or more of sodium silicate, polyacrylic acid, sodium polyacrylate, sodium hexametaphosphate, ammonium polyacrylate and sodium pyrophosphate.
According to one embodiment of the invention, the binder is one or more of styrene-acrylic latex, styrene-butadiene rubber, polymethyl methacrylate, polybutyl methacrylate, polyvinylpyrrolidone, polyethylene oxide, polyvinyl alcohol and sodium carboxymethyl cellulose.
According to an embodiment of the present invention, the surfactant is a polyoxyethylene fatty alcohol ether.
The preparation method of the lithium ion battery composite diaphragm coating slurry comprises the following steps:
(1) Preparing composite adsorbing material powder by adopting a solution polymerization method;
(2) And weighing the adsorption material powder, the dispersing agent, the deionized water, the binder and the surfactant, uniformly mixing and stirring the adsorption material powder, the dispersing agent and the deionized water, adding the binder and the surfactant, and uniformly stirring to form the lithium ion battery composite membrane coating slurry.
According to an embodiment of the present invention, step (1) includes:
Weighing nonmetallic minerals, acrylamide monomers, an initiator and deionized water, adding the nonmetallic minerals, the acrylamide monomers and the deionized water into a reaction bottle, performing ultrasonic dispersion for 30min, then adding the initiator, placing the reaction bottle into a water bath kettle for constant-temperature polymerization under the protection of nitrogen, washing a product with the deionized water after the polymerization is completed, drying, grinding and sieving to obtain composite adsorption material powder.
The lithium ion battery composite diaphragm is prepared by transferring the lithium ion battery diaphragm slurry to one side or two sides of a polyolefin-based film through dip coating, rotary spraying, roller coating or stencil printing, and drying.
The composite coating membrane has the beneficial effects that the polyacrylamide/nonmetallic mineral composite material is used as the functional coating of the lithium ion battery composite membrane, the prepared composite coating membrane can effectively capture heavy metal ions dissolved out of the battery, the SEI membrane is damaged or the membrane is punctured by the metal ions separated out of the negative electrode, the battery cycle performance and the safety performance are improved, and the polyacrylamide/nonmetallic mineral coating has good supporting effect on the lithium ion battery composite membrane, the shrinkage degree of the membrane when heated is reduced, and the heat shrinkage performance of the membrane is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 shows the Mn content of the negative electrode sheets of examples 1-3 and comparative example 500cycles.
Detailed Description
Various embodiments of the invention are disclosed below, and for purposes of clarity, numerous practical details are set forth in the following description. However, it should be understood that these practical details are not to be taken as limiting the invention. That is, in some embodiments of the invention, these practical details are unnecessary.
The lithium ion battery composite membrane coating slurry comprises composite adsorbing material powder, a dispersing agent, deionized water, a binder and a surfactant, wherein the weight ratio of the composite adsorbing material powder to the dispersing agent to the deionized water to the binder to the surfactant is 1:0.001-0.005:2.9-6.8:0.1-0.4:0.004-0.007.
The composite adsorption material powder comprises nonmetallic minerals, acrylamide monomers, an initiator and deionized water, wherein the mass ratio of the nonmetallic minerals, the acrylamide monomers, the initiator and the deionized water is 1:0.15-0.45:0.01-0.05:10-50. Preferably, the nonmetallic minerals are one or more of diatomite, zeolite, sepiolite, attapulgite and montmorillonite. Furthermore, the nonmetallic mineral is attapulgite with a one-dimensional nanorod structure and an internally connected micro-nano pore structure, and the particle size of the attapulgite is 400-1000 nm. The attapulgite has a large amount of hydrophilic silicon hydroxyl on the surface, has good affinity to electrolyte, and can improve the liquid absorption performance of the diaphragm. The attapulgite is mainly used for adsorbing metal ions through physical adsorption and ion exchange adsorption, and the adsorption capacity of the polyacrylamide is further improved by grafting the strong-polarity amide groups on the polyacrylamide onto the surface of the attapulgite and utilizing the synergistic adsorption effect of the polyacrylamide and the attapulgite. And the affinity of the attapulgite and the polyolefin membrane is poor, so that the compatibility of the attapulgite and the polyolefin membrane can be enhanced by compounding polyacrylamide, and the occurrence of the missing coating phenomenon is reduced.
Preferably, the initiator is azobisisobutyronitrile or potassium persulfate. The dispersing agent is one or more of sodium silicate, polyacrylic acid, sodium polyacrylate, sodium hexametaphosphate, ammonium polyacrylate and sodium pyrophosphate. The binder is one or more of styrene-acrylic latex, styrene-butadiene rubber, polymethyl methacrylate, polybutyl methacrylate, polyvinylpyrrolidone, polyethylene oxide, polyvinyl alcohol and sodium carboxymethyl cellulose. The surfactant is polyoxyethylene fatty alcohol ether.
The preparation method of the lithium ion battery composite diaphragm coating slurry comprises the following steps:
(1) Preparing composite adsorbing material powder by adopting a solution polymerization method;
(2) And weighing the adsorption material powder, the dispersing agent, the deionized water, the binder and the surfactant, mixing and stirring the adsorption material powder, the dispersing agent and the deionized water for 30min, adding the binder and the surfactant for stirring and mixing after uniform stirring, wherein the stirring time is 60min, and the stirring speed is 400-800 rpm, and uniformly stirring to form the lithium ion battery composite membrane coating slurry.
Preferably, step (1) includes:
Weighing nonmetallic minerals, acrylamide monomers, an initiator and deionized water, adding the nonmetallic minerals, the acrylamide monomers and the deionized water into a reaction bottle, performing ultrasonic dispersion for 30min, then adding the initiator, placing the reaction bottle into a water bath kettle for polymerization at a constant temperature of 80 ℃ under the protection of nitrogen, reacting for 5h, washing a product with deionized water after the polymerization is completed, drying at 100 ℃, grinding and sieving to obtain composite adsorbing material powder.
The lithium ion battery composite diaphragm is characterized in that the lithium ion battery diaphragm slurry is transferred to one side or two sides of a polyolefin-based film through dip coating, rotary spraying, roller coating or stencil printing, and is prepared after drying.
Preferably, the polyolefin-based film is a polyethylene-based film or a polypropylene-based film, the drying temperature is 50-65 ℃, and the coating thickness is 1-4 mu m.
The composite coating membrane prepared by adopting the polyacrylamide/nonmetallic mineral composite material as the functional coating of the lithium ion battery composite membrane can effectively capture heavy metal ions dissolved out of the interior of the battery, reduce the precipitation of the metal ions at the negative electrode to damage an SEI membrane or puncture the membrane, improve the cycle performance and the safety performance of the battery, and has good supporting effect on the lithium ion battery composite membrane by the polyacrylamide/nonmetallic mineral coating, reduce the shrinkage degree of the membrane when heated and improve the heat shrinkage performance of the membrane.
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
Example 1:
The preparation method comprises the steps of weighing attapulgite powder (D50=600 nm), acrylamide monomer, azodiisobutyronitrile and deionized water according to a mass ratio of 1:0.25:0.02:20, adding the attapulgite powder, the acrylamide monomer and the deionized water into a reaction bottle, performing ultrasonic dispersion for 30min, adding the azodiisobutyronitrile, placing the mixture into a water bath kettle under the protection of nitrogen, performing constant-temperature polymerization at 80 ℃, reacting for 5h, washing a product with the deionized water, drying at 100 ℃, grinding and sieving to obtain composite adsorbing material powder.
And (3) weighing the composite adsorption material powder, sodium hexametaphosphate, deionized water, polymethyl methacrylate and polyoxyethylene fatty alcohol ether according to the mass ratio of 1:0.003:4.38:0.3:0.005, adding the composite adsorption material powder, sodium hexametaphosphate and deionized water into a reaction bottle, stirring for 30min, adding the polymethyl methacrylate and polyoxyethylene fatty alcohol ether, stirring for 60min by adopting a high-speed dispersing stirrer, wherein the stirring speed is 450rpm, and forming the lithium ion battery composite membrane coating slurry, wherein the solid content of the slurry is 30%.
And uniformly coating the coating slurry of the lithium ion battery composite membrane on the PE base membrane in a gravure coating mode, wherein the thickness of the base membrane is 12 mu m, and drying the coating membrane at the temperature of 60 ℃ to obtain the lithium ion battery composite membrane. The lithium ion battery composite diaphragm is immersed into lithium ion battery electrolyte (1M LiPF6 EC/DMC) with the liquid absorption rate of 230%, the lithium ion battery composite diaphragm is tested for moisture content in a glove box by using a Karl Fischer moisture meter, the moisture content of the lithium ion battery composite diaphragm is 670ppm, the thermal shrinkage value MD of the lithium ion battery composite diaphragm is 2.11% under the condition of 130 ℃ per 1h, and the TD is 1.34%. The ion conductivity of the lithium ion battery composite membrane is 1.66 mS/cm. The lithium manganate positive electrode material, graphite, electrolyte and lithium ion battery composite diaphragm are assembled into a battery, the performance of the battery is tested, the capacity retention rate of the battery is 90.72% after 500 times of normal-temperature charge-discharge cycles at 1C rate, and the capacity retention rate of the battery is 85.56% after 500 times of 55 ℃ charge-discharge cycles at 1C rate. The Mn ion content of the negative electrode plate after normal temperature circulation is 225ppm, and the Mn ion content of the negative electrode plate after 55 ℃ circulation is 293ppm.
Example 2:
The preparation method comprises the steps of weighing attapulgite powder (D50=600 nm), acrylamide monomer, azodiisobutyronitrile and deionized water according to a mass ratio of 1:0.4:0.02:20, adding the attapulgite powder, the acrylamide monomer and the deionized water into a reaction bottle, performing ultrasonic dispersion for 30min, adding the azodiisobutyronitrile, placing the mixture into a water bath kettle under the protection of nitrogen, performing constant-temperature polymerization at 80 ℃, reacting for 5h, washing a product with the deionized water, drying at 100 ℃, grinding and sieving to obtain composite adsorbing material powder.
And (3) weighing the composite adsorption material powder, sodium hexametaphosphate, deionized water, polymethyl methacrylate and polyoxyethylene fatty alcohol ether according to the mass ratio of 1:0.003:4.38:0.3:0.005, adding the composite adsorption material powder, sodium hexametaphosphate and deionized water into a reaction bottle, stirring for 30min, adding the polymethyl methacrylate and polyoxyethylene fatty alcohol ether, stirring for 60min by adopting a high-speed dispersing stirrer, wherein the stirring speed is 450rpm, and forming the lithium ion battery composite membrane coating slurry, wherein the solid content of the slurry is 30%.
And uniformly coating the coating slurry of the lithium ion battery composite membrane on the PE base membrane in a gravure coating mode, wherein the thickness of the base membrane is 12 mu m, and drying the coating membrane at the temperature of 60 ℃ to obtain the lithium ion battery composite membrane. The lithium ion battery composite diaphragm is immersed into lithium ion battery electrolyte (1M LiPF6 EC/DMC) with the liquid absorption rate of 204%, the water content of the lithium ion battery composite diaphragm is 620ppm by testing the water content of the lithium ion battery composite diaphragm in a glove box through a Karl Fischer moisture meter, and the heat shrinkage value MD of the lithium ion battery composite diaphragm is 3.60% and the TD is 3.21% under the condition of 130 ℃ per 1 h. The ion conductivity of the lithium ion battery composite membrane is 1.11 mS/cm. The lithium manganate positive electrode material, graphite, electrolyte and lithium ion battery composite diaphragm are assembled into a battery, the performance of the battery is tested, the capacity retention rate of the battery is 87.58% after the battery is subjected to normal-temperature charge-discharge cycle 500 times at 1C rate, and the capacity retention rate of the battery is 80.37% after the battery is subjected to 55 ℃ charge-discharge cycle 500 times at 1C rate. The Mn ion content of the negative electrode plate after normal temperature circulation is 273ppm, and the Mn ion content of the negative electrode plate after 55 ℃ circulation is 385ppm.
Example 3:
The preparation method comprises the steps of weighing attapulgite powder (D50=1100 nm), acrylamide monomer, azodiisobutyronitrile and deionized water according to a mass ratio of 1:0.25:0.02:20, adding the attapulgite powder, the acrylamide monomer and the deionized water into a reaction bottle, performing ultrasonic dispersion for 30min, adding the azodiisobutyronitrile, placing the mixture into a water bath kettle under the protection of nitrogen, performing constant-temperature polymerization at 80 ℃, reacting for 5h, washing a product with the deionized water, drying at 100 ℃, grinding and sieving to obtain composite adsorbing material powder.
And (3) weighing the composite adsorption material powder, sodium hexametaphosphate, deionized water, polymethyl methacrylate and polyoxyethylene fatty alcohol ether according to the mass ratio of 1:0.003:4.38:0.3:0.005, adding the composite adsorption material powder, sodium hexametaphosphate and deionized water into a reaction bottle, stirring for 30min, adding the polymethyl methacrylate and polyoxyethylene fatty alcohol ether, stirring for 60min by adopting a high-speed dispersing stirrer, wherein the stirring speed is 450rpm, and forming the lithium ion battery composite membrane coating slurry, wherein the solid content of the slurry is 30%.
And uniformly coating the coating slurry of the lithium ion battery composite membrane on the PE base membrane in a gravure coating mode, wherein the thickness of the base membrane is 12 mu m, and drying the coating membrane at the temperature of 60 ℃ to obtain the lithium ion battery composite membrane. The lithium ion battery composite diaphragm is immersed into lithium ion battery electrolyte (1M LiPF6 EC/DMC) with the liquid absorption rate of 191 percent, the lithium ion battery composite diaphragm is tested for moisture content in a glove box by a Karl Fischer moisture meter, the moisture content of the lithium ion battery composite diaphragm is 518ppm, the heat shrinkage value MD of the lithium ion battery composite diaphragm at 130 ℃ per 1h is 3.25 percent, and the TD is 2.83 percent. The ionic conductivity was 1.78 mS/cm. The lithium manganate positive electrode material, graphite, electrolyte and lithium ion battery composite diaphragm are assembled into a battery, the performance of the battery is tested, the capacity retention rate of the battery is 88.68% after the battery is subjected to normal-temperature charge-discharge cycle 500 times at 1C rate, and the capacity retention rate of the battery is 82.51% after the battery is subjected to 55 ℃ charge-discharge cycle 500 times at 1C rate. The Mn ion content of the negative electrode plate after normal temperature circulation is 258ppm, and the Mn ion content of the negative electrode plate after 55 ℃ circulation is 325ppm. The results of the performance test of the composite separator and the comparative example (ceramic separator 12+4c) prepared by the methods described in examples 1 to 3 are shown in table 1 and fig. 1, the results of the performance test of the separator of examples 1 to 3 and the comparative example are shown in table 1, and the Mn content of the negative electrode sheet of examples 1 to 3 and the comparative example is 500cycles.
TABLE 1 Performance test results of diaphragms of examples 1-3 and comparative examples
According to experimental results, compared with comparative examples, the lithium ion battery composite membrane in examples 1-3 has higher liquid absorption rate, lower water content, better electric conductivity ions, and better battery capacity retention rate at normal temperature and 55 ℃, improves the cycle performance and safety performance of the battery, and meanwhile, the Mn content of the negative electrode sheet is greatly reduced, so that the lithium ion battery composite membrane in examples 1-3 can effectively capture heavy metal ions dissolved out of the inside of the battery, and the SEI film or puncture membrane is reduced due to precipitation of metal ions at the negative electrode. And the thermal shrinkage rate of the lithium ion battery composite membrane in the embodiment 1 is smaller than that of the lithium ion battery membrane in the comparative example, so that the thermal shrinkage performance of the membrane is improved.
In conclusion, the composite membrane of the lithium ion battery adopts the polyacrylamide/nonmetallic mineral composite material as the functional coating of the composite membrane of the lithium ion battery, the prepared composite coating membrane can effectively capture heavy metal ions dissolved out of the battery, the SEI membrane is broken or the membrane is punctured by the metal ions separated out of the negative electrode, the cycle performance and the safety performance of the battery are improved, and the polyacrylamide/nonmetallic mineral coating has good supporting effect on the composite membrane of the lithium ion battery, the shrinkage degree of the membrane when heated is reduced, and the thermal shrinkage performance of the membrane is improved.
The above are merely embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present invention, should be included in the scope of the claims of the present invention.
Claims (4)
1. A lithium ion battery composite separator coating slurry, comprising:
The composite adsorption material comprises composite adsorption material powder, a dispersing agent, deionized water, a binder and a surfactant, wherein the weight ratio of the composite adsorption material powder to the dispersing agent to the deionized water to the binder to the surfactant is 1:0.001-0.005:2.9-6.8:0.1-0.4:0.004-0.007;
The composite adsorption material powder comprises nonmetallic minerals, acrylamide monomers, an initiator and deionized water, wherein the mass ratio of the nonmetallic minerals to the acrylamide monomers to the initiator to the deionized water is 1:0.15-0.45:0.01-0.05:10-50;
the nonmetallic minerals are attapulgite with a one-dimensional nanorod-shaped structure and an internally connected micro-nano pore structure, and the particle size of the attapulgite is 400-1000 nm;
the initiator is azodiisobutyronitrile or potassium persulfate;
the dispersing agent is one or more of sodium silicate, polyacrylic acid, sodium polyacrylate, sodium hexametaphosphate, ammonium polyacrylate and sodium pyrophosphate;
the binder is one or more of styrene-acrylic latex, styrene-butadiene rubber, polymethyl methacrylate, polybutyl methacrylate, polyvinylpyrrolidone, polyethylene oxide, polyvinyl alcohol and sodium carboxymethyl cellulose;
The surfactant is polyoxyethylene fatty alcohol ether.
2. The method for preparing the lithium ion battery composite membrane coating slurry according to claim 1, comprising the following steps:
(1) Preparing composite adsorbing material powder by adopting a solution polymerization method;
(2) And weighing the adsorption material powder, the dispersing agent, the deionized water, the binder and the surfactant, mixing and stirring the adsorption material powder, the dispersing agent and the deionized water uniformly, adding the binder and the surfactant, and stirring uniformly to form the lithium ion battery composite diaphragm coating slurry.
3. The method for preparing a composite separator coating paste for a lithium ion battery according to claim 2, wherein the step (1) comprises:
Weighing nonmetallic minerals, acrylamide monomers, an initiator and deionized water, adding the nonmetallic minerals, the acrylamide monomers and the deionized water into a reaction bottle, performing ultrasonic dispersion for 30min, then adding the initiator, placing the reaction bottle into a water bath kettle for constant-temperature polymerization under the protection of nitrogen, washing a product with the deionized water after the polymerization is completed, drying, grinding and sieving to obtain composite adsorption material powder.
4. The lithium ion battery composite diaphragm is characterized in that the lithium ion battery composite diaphragm is prepared by transferring the lithium ion battery diaphragm slurry in claim 1 to one side or two sides of a polyolefin-based film through dip coating, rotary spraying, roller coating or stencil printing, and drying.
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| CN111097366A (en) * | 2019-12-31 | 2020-05-05 | 北京师范大学 | A kind of modification method of attapulgite clay and modified attapulgite clay |
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| CN111097366A (en) * | 2019-12-31 | 2020-05-05 | 北京师范大学 | A kind of modification method of attapulgite clay and modified attapulgite clay |
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