CN110993868A - Lithium battery diaphragm and preparation method thereof - Google Patents
Lithium battery diaphragm and preparation method thereof Download PDFInfo
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- CN110993868A CN110993868A CN201911416124.7A CN201911416124A CN110993868A CN 110993868 A CN110993868 A CN 110993868A CN 201911416124 A CN201911416124 A CN 201911416124A CN 110993868 A CN110993868 A CN 110993868A
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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
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
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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
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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 invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery diaphragm which is formed by laminating a skeleton fiber layer, a nanofiber layer and a polymer network layer from bottom to top; the skeleton fiber layer is formed by interweaving micron fibers and chemical short fibers, the nanofiber layer is formed by interweaving nano fibers, and the polymer network layer is formed by interweaving polymers; the nano fiber part extends into the skeleton fiber layer, and the polymer part extends into the nano fiber layer; the preparation method comprises the following steps: 1) depositing the skeleton fiber slurry, and forming to form a skeleton fiber layer; 2) depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, and performing suction filtration and extrusion to obtain a wet film; 3) and spraying the oil-phase polymer solution onto the surface of the nanofiber layer of the wet film, allowing the organic solvent to leave and be mutually soluble with water, forming a polymer network layer on the surface of the wet film, and baking to volatilize the organic solvent and the water to obtain the lithium battery diaphragm. The diaphragm has high porosity, good high temperature resistance, good liquid absorption and good electrolyte infiltration performance.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery diaphragm and a preparation method thereof.
Background
The lithium ion battery mainly comprises four materials, namely a positive electrode material, a negative electrode material, electrolyte and a diaphragm, wherein the diaphragm is a key component about the safety of the lithium battery. The performance of the diaphragm determines the interface structure, internal resistance and the like of the battery, directly influences the capacity, circulation, safety performance and other characteristics of the battery, and the diaphragm with excellent performance plays an important role in improving the comprehensive performance of the battery. The separator has a main function of separating the positive electrode and the negative electrode of the battery to prevent short circuit due to contact between the two electrodes, and also has a function of allowing electrolyte ions to pass therethrough.
At present, lithium battery separators are basically polyolefin separators and separators with the surface of the polyolefin separator functionally coated with ceramic, and the separators have low heat-resistant temperature, poor thermal dimensional stability and poor electrolyte wettability.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a lithium battery diaphragm and a preparation method thereof, which can improve the porosity of the diaphragm.
In order to achieve the purpose, the technical scheme of the invention is that the lithium battery diaphragm is formed by laminating a framework fiber layer, a nanofiber layer and a polymer network layer from bottom to top; the skeleton fiber layer is formed by interweaving micro fibers and chemical short fibers, the nanofiber layer is formed by interweaving nanofibers, and the polymer network layer is formed by interweaving polymers; the nanofiber portion extends into the scaffold fiber layer and the polymer portion extends into the nanofiber layer.
Further, the diameter of the nanofiber is 5-100 nm; the diameter of the micron fiber is 0.5-1 μm, and the length is 10-1000 microns; the diameter of the chemical short fiber is 1-6 μm, and the length is 1-12 mm.
Further, the nano-fiber is at least one of nano-aramid fiber, nano-cellulose fiber, nano-polyacrylonitrile fiber and fibrillated tencel fiber; the micron fiber is at least one of devillicate chemical short fiber, pulp and micron cellulose fiber; the pulp can be wood pulp, cotton pulp, aramid pulp, polyethylene pulp and the like; the chemical short fiber is at least one of PET fiber, PAN fiber, PBO fiber, PA fiber, PI fiber and aramid short fiber.
Further, the polymer is at least one of aramid fiber, polyacrylonitrile, polyvinylidene fluoride and polymethyl methacrylate.
Furthermore, the thickness of the lithium battery diaphragm is 10-70 μm, the porosity is 45-75%, the air permeability is less than 50s/100cc, and the mechanical strength is 10-100 Mpa.
The invention also provides a preparation method of the lithium battery diaphragm, which comprises the following steps:
1) adding water and a dispersing agent into the micron fibers and the chemical short fibers, defibering and dispersing uniformly to obtain skeleton fiber slurry, and forming to form a skeleton fiber layer;
2) adding water and a dispersing agent into the nano-fibers, and defibering and dispersing uniformly to obtain nano-fiber slurry; then depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, and performing suction filtration and extrusion to obtain a wet film;
3) mixing and stirring the polymer and the organic solvent uniformly to obtain an oil phase polymer solution; and spraying the oil-phase polymer solution onto the surface of the nanofiber layer of the wet film, quickly leaving the organic solvent to be mutually soluble with water, separating out the polymer to form a network, forming a polymer network layer on the surface of the wet film, and then sending the network layer into a baking oven to bake so as to volatilize the organic solvent and the water, thereby obtaining the lithium battery diaphragm.
Further, in the step 2), the membrane is filtered, filtered and extruded until the moisture content of the membrane is 35-80%, and then the membrane is transferred to a dry blanket to obtain a wet membrane.
Further, the ratio of the sum of the dosage of the micro-fiber and the chemical short fiber, the dosage of the nano-fiber, the dosage of the polymer and the dosage of the dispersant is 30-70: 20-80: 1-20: 0.1-2.
Further, in the step 3), the content of the polymer in the oil phase polymer solution is 10-30%.
Further, the dispersing agent is any one of sodium carboxymethylcellulose, polyacrylamide, polyethylene oxide and sodium hexametaphosphate; the organic solvent is any one of NMP, acetone, tetrahydrofuran, DMF, DMA, TEP, DMSO, DMAc and butyl sulfone.
The principle of the invention is as follows:
the invention adopts a one-step forming mode to form the lithium battery diaphragm, the framework fibers (micron fibers and chemical short fibers) and the nano fibers are formed into a base film by adopting a paper-like method, the base film has rich pore structures, but macropores exist on the surface of the base film, then oil phase polymers are sprayed, micropores are formed at the macropores and the surface of the base film through liquid-liquid phase conversion, pores are formed again, the porosity is increased, and the wettability of electrolyte is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) the lithium battery diaphragm provided by the invention has the advantages of high porosity, good air permeability, good liquid absorption, good electrolyte retention, obvious improvement on long cycle of the battery, instant liquid absorption, and capability of activating the battery after 10 seconds of liquid injection; the electrolyte has good infiltration performance, and the standing time of the battery cell after liquid injection can be shortened; the thermal dimensional stability is good, and the baking time of the diaphragm can be shortened; the diaphragm provided by the invention can improve the production efficiency of the battery, and has excellent electrochemical performance and good safety performance;
(2) the main fiber adopted by the lithium battery diaphragm provided by the invention is high temperature resistant and stable chemically, the prepared diaphragm is good in thermal dimensional stability, and the surface of the diaphragm is also rich in functional groups, so that the lithium battery diaphragm has a good capturing effect on metal ions and can inhibit the formation of lithium dendrites;
(3) according to the invention, the base film is formed by knotting the nanofibers and the skeleton fibers, and chemical bonds and intermolecular forces among the nanofibers provide good strength for the diaphragm; the fibers are mutually overlapped to form a rich pore structure, the heat resistance is good, and pores are formed at the positions of large pores and on the surface again in a liquid-liquid phase conversion mode to increase the porosity; adopting a one-step forming mode, taking a solvent in the preparation process of the non-woven fabric base film as a water phase, spraying an oil phase polymer on the surface of a wet film, dissolving the organic solvent out with water, and separating out the polymer to form a network to form a polymer network layer;
(4) the polymer network layer on the surface of the lithium battery diaphragm provided by the invention can be well combined with the electrode plate, so that the diaphragm and the electrode plate are prevented from slipping.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a lithium battery separator provided in embodiment 1 of the present invention;
fig. 2 is a scanning electron microscope image of a lithium battery diaphragm obtained by preparing a wet film through step 1) and step 2) in the preparation method provided in embodiment 1 of the present invention, baking, curling, post-processing, finishing, and slitting;
fig. 3 is a scanning electron microscope image of a lithium battery separator provided in embodiment 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a lithium battery separator, which is formed by stacking a skeleton fiber layer, a nanofiber layer, and a polymer network layer from bottom to top; the framework fiber layer is formed by interweaving devillicate PAN fibers and PET fibers, the nanofiber layer is formed by interweaving nano aramid fibers and nano cellulose fibers, and the polymer network layer is formed by interweaving PVDF; and the nano aramid fiber and the nano cellulose fiber extend into the skeleton fiber layer partially, and the PVDF extends into the nano fiber layer partially.
The preparation method of the lithium battery diaphragm comprises the following steps:
1) adding water and sodium hexametaphosphate into 50 parts of the broomed PAN fiber and the PET fiber which are mixed in any proportion, defibering and dispersing uniformly to obtain skeleton fiber slurry, and forming a skeleton fiber layer through deposition molding;
2) adding water and sodium hexametaphosphate into 10 parts of nano aramid fiber and 40 parts of nano cellulose fiber, and defibering and dispersing uniformly to obtain nano fiber slurry; then depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, performing suction filtration and extrusion until the moisture content of the membrane is 60%, and transferring the membrane onto a dry blanket to obtain a wet membrane;
3) mixing and stirring 20 parts of PVDF and NMP solvent uniformly to obtain an oil phase polymer solution, wherein the content of the polymer in the oil phase polymer solution is 20%; spraying the oil phase polymer solution onto the surface of the nanofiber layer of the wet film, enabling NMP to be rapidly removed and mutually soluble with water, separating out the polymer to form a network, forming holes at the large holes and the surface of the film, forming a polymer network layer on the surface of the wet film, then sending the film into a baking oven for baking to enable the organic solvent and the water to be volatilized, and obtaining the lithium battery diaphragm through curling and post-treatment finishing and cutting.
In the method of the embodiment: the total amount of sodium hexametaphosphate in step 1) and step 2) was 1.5 parts.
The scanning electron microscope image of the lithium battery diaphragm prepared by the method is shown as figure 2, and the scanning electron microscope image of the lithium battery diaphragm prepared by the method is shown as figure 3, so that macropores exist on the surface of the diaphragm obtained by molding the skeleton fibers (the micron fibers and the chemical short fibers) and the nano fibers by a paper-like method, while the preparation method disclosed by the invention is used for spraying the oil-phase polymer on the basis of the steps 1) and 2), and micropores are formed at the macropores and the surface of the base film through liquid-liquid phase conversion, so that the porosity of the surface of the diaphragm is increased.
The diameter of the nano aramid fiber and the nano cellulose fiber adopted by the lithium battery diaphragm and the preparation method thereof is 5-100 nm; the diameter of the broomed PAN fiber is 0.5-1 μm, and the length is 10-1000 μm; the diameter of the PET fiber is 2 μm, and the length is 5 mm; the prepared lithium battery diaphragm has the thickness of 25 mu m, the porosity of 65 percent, the air permeability of 13s/100cc and the mechanical strength of 37 Mpa.
Example 2
The embodiment provides a lithium battery diaphragm, which is formed by stacking a skeleton fiber layer, a nanofiber layer and a polymer network layer from bottom to top; the framework fiber layer is formed by interweaving PAN fibers, PET fibers and broomed PAN fibers, the nanofiber layer is formed by interweaving nano cellulose fibers, and the polymer network layer is formed by interweaving polyacrylonitrile and polyvinylidene fluoride; and the nanometer cellulose fiber part extends into the skeleton fiber layer, and the polyacrylonitrile and polyvinylidene fluoride part extends into the nanometer fiber layer.
The preparation method of the lithium battery diaphragm comprises the following steps:
1) adding water and polyacrylamide into 40 parts of PAN fiber, PET fiber and broomed PAN fiber which are mixed in any proportion, defibering and dispersing uniformly to obtain skeleton fiber slurry, and forming a skeleton fiber layer through deposition molding;
2) adding water and polyacrylamide into 60 parts of nano cellulose fibers, and defibering and dispersing uniformly to obtain nano fiber slurry; depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, performing suction filtration and extrusion until the moisture content of the membrane is 70%, and transferring the membrane onto a dry blanket to obtain a wet membrane;
3) mixing 10 parts of polyacrylonitrile, polyvinylidene fluoride and DMSO (dimethylsulfoxide) solvent which are mixed in any proportion, and uniformly stirring to obtain an oil phase polymer solution, wherein the content of the polymer in the oil phase polymer solution is 20%; spraying the oil phase polymer solution onto the surface of a nanofiber layer of a wet film, enabling DMSO (dimethyl sulfoxide) to be rapidly removed and mutually soluble with water, separating out a polymer to form a network, forming holes at the large holes and the surface of the film, forming a polymer network layer on the surface of the wet film, then sending the film into a baking oven for baking to volatilize an organic solvent and water, and curling, post-processing, finishing and cutting to obtain the lithium battery diaphragm.
In the process of this example, the total amount of polyacrylamide used in steps 1) and 2) was 0.5 part.
The diameter of the nano cellulose fiber adopted by the lithium battery diaphragm and the preparation method thereof is 5-100 nm; the diameter of the broomed PAN fiber is 0.5-1 μm, and the length is 10-1000 μm; the diameters of the PAN fiber and the PET fiber are 4 mu m, and the lengths of the PAN fiber and the PET fiber are 3 mm; the prepared lithium battery diaphragm has the thickness of 20 mu m, the porosity of 65 percent, the air permeability of 11s/100cc and the mechanical strength of 45 Mpa.
Example 3
The embodiment provides a lithium battery diaphragm, which is formed by stacking a skeleton fiber layer, a nanofiber layer and a polymer network layer from bottom to top; the skeleton fiber layer is formed by interweaving devillicate broomed wood pulp, devillicate broomed PBO microfiber and PET fiber, the nanofiber layer is formed by interweaving nanocellulose fiber and fibrillated tencel fiber, and the polymer network layer is formed by interweaving polyacrylonitrile; and the nanocellulose fibers and fibrillated tencel fibers extend partially into the skeleton fiber layer and the polyacrylonitrile extends partially into the nanofiber layer.
The preparation method of the lithium battery diaphragm comprises the following steps:
1) adding water and sodium carboxymethylcellulose into 30 parts of the broomed wood pulp, the broomed PBO fiber and the PET fiber which are mixed in any proportion, defibering and dispersing uniformly to obtain skeleton fiber slurry, and forming a skeleton fiber layer by deposition molding;
2) adding water and sodium carboxymethyl cellulose into 70 parts of nano cellulose fibers and fibrillated tencel fibers which are mixed in any proportion, and defibering and dispersing uniformly to obtain nano fiber slurry; depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, performing suction filtration and extrusion until the moisture content of the membrane is 40%, and transferring the membrane onto a dry blanket to obtain a wet membrane;
3) mixing and stirring 10 parts of polyacrylonitrile and a DMF solvent uniformly to obtain an oil phase polymer solution, wherein the content of a polymer in the oil phase polymer solution is 10%; spraying the oil phase polymer solution onto the surface of the nanofiber layer of the wet film, enabling DMF to be rapidly removed and be mutually soluble with water, separating out the polymer to form a network, forming holes at the large holes and the surface of the film, forming a polymer network layer on the surface of the wet film, then sending the film into a baking oven for baking to volatilize the organic solvent and the water, and obtaining the lithium battery diaphragm through curling, post-treatment finishing and cutting.
In the method of this example, the total amount of sodium carboxymethylcellulose used in step 1) and step 2) is 1 part.
The diameter of the nano cellulose fiber and the fibrillated tencel fiber adopted by the lithium battery diaphragm and the preparation method thereof is 5-100 nm; the wood pulp and the devillicate broomed PBO microfibers have a diameter of 0.5 to 1 μm and a length of 10 to 1000 microns; the diameter of the PET fiber is 5 μm, and the length is 6 mm; the prepared lithium battery diaphragm has the thickness of 30 mu m, the porosity of 70 percent, the air permeability of 20s/100cc and the mechanical strength of 50 Mpa.
Example 4
The embodiment provides a lithium battery diaphragm, which is formed by stacking a skeleton fiber layer, a nanofiber layer and a polymer network layer from bottom to top; the skeleton fiber layer is formed by interweaving aramid pulp, broomed PAN fiber and PI fiber, the nanofiber layer is formed by interweaving nano cellulose fiber, and the polymer network layer is formed by interweaving polyvinylidene fluoride; and the nanometer cellulose fiber part extends into the skeleton fiber layer, and the polyvinylidene fluoride part extends into the nanometer fiber layer.
The preparation method of the lithium battery diaphragm comprises the following steps:
1) adding water and sodium hexametaphosphate into 30 parts of aramid pulp, broomed PAN fiber and PI fiber which are mixed in any proportion, defibering and dispersing uniformly to obtain skeleton fiber slurry, and forming a skeleton fiber layer through deposition molding;
2) adding water and sodium hexametaphosphate into 80 parts of nano cellulose fibers, and uniformly dispersing to obtain nano fiber slurry; depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, performing suction filtration and extrusion until the moisture content of the membrane is 80%, and transferring the membrane onto a dry blanket to obtain a wet membrane;
3) mixing and stirring 1 part of polyvinylidene fluoride and an NMP solvent uniformly to obtain an oil phase polymer solution, wherein the content of a polymer in the oil phase polymer solution is 30%; spraying the oil phase polymer solution onto the surface of the nanofiber layer of the wet film, enabling NMP to be rapidly removed and mutually soluble with water, separating out the polymer to form a network, forming holes at the large holes and the surface of the film, forming a polymer network layer on the surface of the wet film, then sending the film into a baking oven for baking to enable the organic solvent and the water to be volatilized, and obtaining the lithium battery diaphragm through curling and post-treatment finishing and cutting.
In the process of this example, the total amount of sodium hexametaphosphate used in step 1) and step 2) was 2 parts.
The diameter of the nano cellulose fiber adopted by the lithium battery diaphragm and the preparation method thereof is 5-100 nm; the diameter of the aramid pulp and the PAN fiber which is broomed is 0.5-1 μm, and the length is 10-1000 μm; the diameter of the PI fiber is 6 mu m, and the length of the PI fiber is 3 mm; the prepared lithium battery diaphragm has the thickness of 20 mu m, the porosity of 71 percent, the air permeability of 40s/100cc and the mechanical strength of 48 Mpa.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A lithium battery separator characterized by: the lithium battery diaphragm is formed by laminating a skeleton fiber layer, a nanofiber layer and a polymer network layer from bottom to top; the skeleton fiber layer is formed by interweaving micro fibers and chemical short fibers, the nanofiber layer is formed by interweaving nanofibers, and the polymer network layer is formed by interweaving polymers; the nanofiber portion extends into the scaffold fiber layer and the polymer portion extends into the nanofiber layer.
2. A lithium battery separator as claimed in claim 1, wherein: the diameter of the nanofiber is 5-100 nm; the diameter of the micron fiber is 0.5-1 μm, and the length is 10-1000 microns; the diameter of the chemical short fiber is 1-6 μm, and the length is 1-12 mm.
3. A lithium battery separator as claimed in claim 1, wherein: the nano fiber is at least one of nano aramid fiber, nano cellulose fiber, nano polyacrylonitrile fiber and fibrillated tencel fiber; the micron fiber is at least one of devillicate chemical short fiber, pulp and micron cellulose fiber; the chemical short fiber is at least one of PET fiber, PAN fiber, PBO fiber, PA fiber, PI fiber and aramid short fiber.
4. A lithium battery separator as claimed in claim 1, wherein: the polymer is at least one of aramid fiber, polyacrylonitrile, polyvinylidene fluoride and polymethyl methacrylate.
5. A lithium battery separator as claimed in claim 1, wherein: the lithium battery diaphragm has the thickness of 10-70 mu m, the porosity of 45-75%, the air permeability of less than 50s/100cc and the mechanical strength of 10-100 Mpa.
6. A method for preparing a lithium battery separator as claimed in claim 1, comprising the steps of:
1) adding water and a dispersing agent into the micron fibers and the chemical short fibers, defibering and dispersing uniformly to obtain skeleton fiber slurry, and forming to form a skeleton fiber layer;
2) adding water and a dispersing agent into the nano-fibers, and defibering and dispersing uniformly to obtain nano-fiber slurry; then depositing the nanofiber slurry on the skeleton fiber layer to form a nanofiber layer, and performing suction filtration and extrusion to obtain a wet film;
3) mixing and stirring the polymer and the organic solvent uniformly to obtain an oil phase polymer solution; and spraying the oil-phase polymer solution onto the surface of the nanofiber layer of the wet film, quickly leaving the organic solvent to be mutually soluble with water, separating out the polymer to form a network, forming a polymer network layer on the surface of the wet film, and then sending the network layer into a baking oven to bake so as to volatilize the organic solvent and the water, thereby obtaining the lithium battery diaphragm.
7. The method of preparing a lithium battery separator as claimed in claim 6, wherein: in the step 2), the membrane is filtered, extruded until the moisture content of the membrane is 35-80%, and then transferred to a dry blanket to obtain a wet membrane.
8. The method of preparing a lithium battery separator as claimed in claim 6, wherein: the sum of the dosage of the micro-fiber and the chemical short fiber, the dosage of the nano-fiber, the dosage of the polymer and the dosage of the dispersant are 30-70: 20-80: 1-20: 0.1-2.
9. The method of preparing a lithium battery separator as claimed in claim 6, wherein: the content of the chemical short fiber in the step 1) is 0.6-1 kg/m3(ii) a Step 2) the content of the nano-fiber in the nano-fiber slurry is 2-4 kg/m3(ii) a In the step 3), the content of the polymer in the oil phase polymer solution is 10-30%.
10. The method of preparing a lithium battery separator as claimed in claim 6, wherein: the dispersing agent is any one of sodium carboxymethylcellulose, polyacrylamide, polyoxyethylene and sodium hexametaphosphate; the organic solvent is any one of NMP, acetone, tetrahydrofuran, DMF, DMA, TEP, DMSO, DMAc and butyl sulfone.
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| CN201911416124.7A CN110993868A (en) | 2019-12-31 | 2019-12-31 | Lithium battery diaphragm and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112332020A (en) * | 2020-10-31 | 2021-02-05 | 华南理工大学 | Cross-scale micro-nano cellulose lithium ion battery diaphragm and preparation method thereof |
| CN113969516A (en) * | 2020-07-23 | 2022-01-25 | 华南理工大学 | PET fiber reinforced and toughened isotropic nano cellulose film and preparation method thereof |
-
2019
- 2019-12-31 CN CN201911416124.7A patent/CN110993868A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969516A (en) * | 2020-07-23 | 2022-01-25 | 华南理工大学 | PET fiber reinforced and toughened isotropic nano cellulose film and preparation method thereof |
| CN112332020A (en) * | 2020-10-31 | 2021-02-05 | 华南理工大学 | Cross-scale micro-nano cellulose lithium ion battery diaphragm and preparation method thereof |
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