CN112993490A - Lithium battery diaphragm and preparation method and application thereof - Google Patents
Lithium battery diaphragm and preparation method and application thereof Download PDFInfo
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- CN112993490A CN112993490A CN202110237630.0A CN202110237630A CN112993490A CN 112993490 A CN112993490 A CN 112993490A CN 202110237630 A CN202110237630 A CN 202110237630A CN 112993490 A CN112993490 A CN 112993490A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a lithium battery diaphragm and a preparation method and application thereof, and relates to the technical field of lithium batteries. A lithium battery diaphragm comprises a base film and an organic elastic material coating covered on the base film; the tensile strength of the diaphragm in the transverse direction and the longitudinal direction is 200-300MPa, the elongation at break is 80-150%, and the puncture resistance strength is more than 950 GF. The organic elastic material in the diaphragm comprises at least one of acrylic resin, hydrogenated styrene-butadiene block copolymer and thermoplastic polyurethane elastomer rubber. The lithium battery separator has high mechanical strength, and improves the tensile strength and the puncture resistance strength of the separator in the mechanical directions (MD and TD). The organic elastic material coating is resistant to electrolyte corrosion, and when an external force impacts the battery, the coating can ensure that the anode and cathode materials are not short-circuited, so that the safety of the lithium ion battery is improved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a lithium battery diaphragm and a preparation method and application thereof.
Background
The lithium ion battery has the advantages of high voltage, high specific energy density, long cycle life, small self-discharge, safety, no memory effect and the like, and is applied to various fields. In order to avoid the contact between the positive electrode and the negative electrode in the lithium ion battery, the two electrodes need to be separated from each other through a diaphragm so as to prevent the short circuit of the battery. The diaphragm plays an important role in the lithium ion battery, and the diaphragm of the current lithium ion battery has the following defects:
the mechanical property is poor;
② the liquid absorption rate is low.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a lithium battery diaphragm to solve the technical problems of poor mechanical performance and low liquid absorption rate of the lithium battery diaphragm in the prior art.
The second purpose of the invention is to provide the preparation method of the lithium battery diaphragm, which has simple process and strong process controllability.
The third purpose of the invention is to provide the application of the lithium battery diaphragm in the lithium battery, provide a diaphragm material with high safety and high mechanical property for the lithium battery, and improve the conductivity and safety of the lithium battery.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a lithium battery diaphragm in a first aspect, which comprises a base film and an organic elastic material coating covered on the base film; the tensile strength of the diaphragm in the transverse direction and the longitudinal direction is 200-300MPa, the elongation at break is 80-150%, and the puncture resistance strength is more than 950 GF.
Further, the organic elastic material coating layer includes an organic elastic material;
preferably, the organic elastic material includes at least one of an acrylic resin, a hydrogenated styrene-butadiene block copolymer, and a thermoplastic polyurethane elastomer rubber.
Further, the thickness of the organic elastic material coating is 1-15 μm.
Further, the acrylic resin is of the type of japanese Ruizzily 620B;
preferably, the hydrogenated styrene-butadiene block copolymer is a type of kraton G1651;
preferably, the thermoplastic polyurethane elastomer rubber is of the type german scientific 385 SX.
Further, the base film includes a polyolefin separator;
preferably, the polyolefin separator includes one of a polypropylene separator, a polyethylene separator, or a composite separator composed of polypropylene and polyethylene.
Further, the organic elastic material coating is mainly formed by coating and drying an organic elastic material solution;
preferably, the solvent in the organic elastomeric material solution comprises at least one of water, ethanol and n-amyl acetate.
Further, the mass percentage of the organic elastic material in the organic elastic material solution is 20-80%, and the balance is solvent;
preferably, the organic elastic material solution contains 30-50% by mass of the organic elastic material and the balance of the solvent.
The second aspect of the present invention provides the method for preparing the lithium battery separator according to the first aspect, wherein the lithium battery separator is obtained by coating the surface of the base film with an organic elastic material solution and drying the coating;
wherein an organic elastic material solution is coated on at least one surface of the base film.
Further, the organic elastic material solution is obtained by uniformly dispersing the organic elastic material in a solvent;
preferably, the means of dispersing comprises stirring;
preferably, the stirring speed is 500-;
preferably, the drying temperature is 50-70 ℃, and the drying time is 5-60 min.
The invention provides the application of the lithium battery diaphragm prepared by the preparation method in the first aspect and the lithium battery diaphragm prepared by the preparation method in the second aspect.
Compared with the prior art, the invention has the following beneficial effects:
1. the lithium battery diaphragm provided by the invention improves the flexibility of the diaphragm base film, so that the diaphragm has good mechanical properties, the transverse and longitudinal tensile strength of the mechanical properties are both 200-300MPa, the elongation at break is 80-150%, the puncture resistance strength can reach more than 950GF, and the liquid absorption amount can reach 1.06mg/cm2(ii) a The adhesive capacity between the diaphragm and the pole piece is increased, and the adsorption and retention capacity of the diaphragm on electrolyte is improved, so that the safety performance and the electrical performance of the battery are improved.
2. The preparation method of the lithium battery diaphragm provided by the invention is simple in process, convenient to operate, strong in process controllability and suitable for large-scale industrial production.
3. The lithium battery made of the lithium battery diaphragm provided by the invention has good thermal stability, and the positive and negative electrode materials are prevented from being short-circuited under the abuse conditions of puncture, impact, extrusion and the like of the battery, so that the safety of the battery is improved.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural view of a lithium battery separator provided in example 1;
fig. 2 is a photograph showing the puncture resistance effect of the organic elastic material coating layer of the lithium battery separator provided in example 4.
Wherein, 1-organic elastic material coating; 2-a base film; 3-holes.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The lithium ion battery mainly comprises five parts, namely a positive electrode material, a negative electrode material, an electrolyte, a diaphragm, a packaging material and the like. The diaphragm plays the role of electronic insulation between the positive electrode and the negative electrode and provides a lithium ion migration micropore channel, and is a key material for ensuring the safety of a battery system and influencing the performance of the battery. Although the separator does not directly participate in the electrode reaction, it affects the battery dynamics process and determines the charge and discharge, cycle life, rate and other properties of the battery. The tensile strength of the separator in the TD direction is much lower than in the MD direction. Under the action of external force, the TD direction is easy to crack, and the problem of battery safety is caused.
According to a first aspect of the present invention, there is provided a lithium battery separator comprising a base film and a coating layer of an organic elastic material covering the base film; the tensile strength of the diaphragm in the transverse direction and the longitudinal direction is 200-300MPa, the elongation at break is 80-150%, and the puncture resistance strength is more than 950 GF.
The lithium battery diaphragm provided by the invention improves the tensile strength of the diaphragm in the mechanical directions (MD and TD), and can reach 200-300MPa, while the tensile strength of the diaphragm in the prior art is about 150 MPa. The elongation at break is 80% -150%, the puncture resistance strength is above 950GF, the puncture resistance strength of the diaphragm is obviously improved, the damage to the diaphragm caused by electric stress and assembly process is prevented, and the use safety is ensured in the use process of the battery.
The function of the separator in the lithium ion battery is mainly embodied in two aspects. Firstly, provide the safety guarantee for the battery. The diaphragm material must have good insulation at first to prevent the short circuit of positive and negative electrodes or the short circuit caused by the piercing of burrs, particles and dendrites, therefore, the diaphragm needs to have certain tensile and puncture strength, is not easy to tear, basically keeps the stability of the size under the sudden high-temperature condition, and cannot cause large-area short circuit and thermal runaway of the battery due to the fusion shrinkage. And the other is to provide a micropore channel for realizing charge and discharge functions and multiplying power performance for the lithium ion battery. Therefore, the separator must be a thin film having a high porosity and a uniform pore distribution.
The mechanical strength of the lithium battery diaphragm comprises tensile strength and piercing strength, and the tensile strength requires that the diaphragm is not damaged during coating and winding; the larger the piercing strength is, the more difficult the burrs and protruding particles on the pole piece pierce the diaphragm, or the battery pierces the diaphragm when lithium dendrites appear, so that the short circuit of the battery is avoided, and the safety of the battery is guaranteed.
The tensile strength is a critical value of the diaphragm which changes from uniform plastic deformation to local concentrated plastic deformation transition, and is also the maximum bearing capacity of the diaphragm under the static stretching condition. Tensile strength characterizes the resistance to maximum uniform plastic deformation of the separator, which is uniform and consistent before the separator is subjected to maximum tensile stress, but beyond that, the separator begins to neck, i.e., to concentrate. The tensile strength reflects the rupture resistance of the membrane.
Further, the organic elastic material coating layer includes an organic elastic material;
preferably, the organic elastic material includes at least one of an acrylic resin, a hydrogenated styrene-butadiene block copolymer, and a thermoplastic polyurethane elastomer rubber.
The lithium battery diaphragm material provided by the invention comprises a base film and an organic elastic material coating coated on the base film. The coating covers the holes on the base film to separate the electrolytes of the positive and negative electrodes; and the coating has good wettability to electrolyte and has sufficient liquid absorption and moisture retention capacity. In addition, the organic coating has higher mechanical strength, and is compounded with the base film, so that the tensile strength of the diaphragm in the mechanical direction (MD and TD) is improved, and the puncture resistance of the diaphragm is obviously improved.
The organic elastic material coating improves the wettability of the diaphragm to electrolyte, promotes the obturator function of the diaphragm, improves the anti-extrusion capacity of the diaphragm and reduces the risk of being pierced by lithium dendrites.
The acrylic resin is a generic term for polymers of acrylic acid, methacrylic acid and derivatives thereof. After the coating made of acrylic resin is dried, a porous structure can be formed, so that the diaphragm has stronger liquid absorption and electrode bonding performance.
The hydrogenated styrene-butadiene block copolymer is a hot melt rubber having the chemical formula (C)8H8.C4H6) x, which does not contain unsaturated double bonds and therefore has good chemical stability and mechanical properties.
Thermoplastic polyurethane elastomer rubbers whose molecules are substantially linear with no or little chemical crosslinking. The linear polyurethane molecular chains have physical crosslinking formed by a plurality of hydrogen bonds, and the hydrogen bonds play a role in strengthening the shape of the linear polyurethane molecular chains, so that the thermoplastic polyurethane elastomer rubber has the advantages of high modulus, high strength, wear resistance, chemical resistance, hydrolysis resistance, high and low temperature resistance and mould resistance.
Further, the thickness of the organic elastic material coating is 1-15 μm.
In a specific embodiment of the present invention, the coating thickness is 1 to 25 μm, and the thickness of the organic elastic material coating layer formed after drying is 1 to 15 μm.
The thickness of the organic elastic material coating affects the thickness of the lithium battery diaphragm, and the thinner the diaphragm is, the smaller the internal resistance of the battery is, so that more space can be reserved for an electrode material; but the thickness is too thin, and mechanical properties will be influenced, are more easily pierced by large granule, pole piece burr and dendrite, lead to battery factor of safety to reduce. In a preferred embodiment of the invention, the thickness of the coating of organic elastomeric material is typically, but not limited to, 1 μm, 5 μm, 10 μm and 15 μm.
Further, the acrylic resin is of the type of japanese Ruizzily 620B;
preferably, the hydrogenated styrene-butadiene block copolymer is a type of kraton G1651;
preferably, the thermoplastic polyurethane elastomer rubber is of the type german scientific 385 SX.
Further, the base film includes a polyolefin separator.
The polyolefin diaphragm can provide good mechanical property and chemical stability within a reasonable cost range, has high-temperature self-closing property, and ensures the safety of the lithium ion battery in daily use.
Preferably, the polyolefin separator includes one of a polypropylene separator, a polyethylene separator, or a composite separator composed of polypropylene and polyethylene.
The composite diaphragm not only has excellent mechanical property, but also has certain thermal closed pore property, and the difference of the melting points of PE and PP is utilized. When the internal temperature of the battery rises, the PE diaphragm melts and is blocked after the internal temperature of the battery reaches the PE melting point, lithium ions cannot pass through, the battery cannot continue to work, thermal runaway is prevented, and meanwhile, the temperature does not reach the PP melting point, so that the PP layer is not influenced by the temperature, the overall shape of the diaphragm can be maintained unchanged, the function of serving as the diaphragm is continued, and the contact of the positive electrode and the negative electrode is prevented.
Further, the organic elastic material coating is mainly formed by coating and drying an organic elastic material solution;
preferably, the solvent in the organic elastomeric material solution comprises at least one of water, ethanol and n-amyl acetate.
The solvent in the organic elastomeric solution dilutes the organic elastomeric material, allowing the thickness of the coating to be easily controlled and removed during subsequent drying.
Furthermore, the mass percentage of the organic elastic material in the organic elastic material solution is 20-80%, and the balance is solvent.
In particular embodiments of the invention, the mass percentage of organic elastomeric material is typically, but not limited to, 20%, 40%, 60% or 80%.
Preferably, the organic elastic material solution contains 30-50% by mass of the organic elastic material and the balance of the solvent.
In a preferred embodiment of the invention, the mass percentage of organic elastomeric material is typically, but not limited to, 30%, 40% or 50%.
The second aspect of the present invention provides the method for preparing the lithium battery separator according to the first aspect, wherein the lithium battery separator is obtained by coating the surface of the base film with an organic elastic material solution and drying the coating;
wherein an organic elastic material solution is coated on at least one surface of the base film.
In a specific embodiment of the present invention, the organic elastic material solution is coated on one surface or both surfaces of the base film.
Further, the organic elastic material solution is obtained by uniformly dispersing the organic elastic material in a solvent.
Preferably, the means of dispersing comprises stirring;
preferably, the stirring speed is 500-.
In a particular embodiment of the invention, the stirring speed is typically, but not limited to, 500r/min, 800r/min or 1000 r/min; the stirring time is typically, but not limited to, 1h, 3h or 6 h.
Preferably, the drying temperature is 50-70 ℃, and the drying time is 5-60 min.
The invention provides the application of the lithium battery diaphragm prepared by the preparation method in the first aspect and the lithium battery diaphragm prepared by the preparation method in the second aspect.
The lithium battery made of the lithium battery diaphragm provided by the invention ensures that the positive and negative electrode materials are not short-circuited when the battery is impacted by external force, and has good safety.
Some embodiments of the present invention will be described in detail below with reference to examples. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The specifications and types of the raw materials used in the examples and comparative examples of the present invention are shown in the following table 1, and they are commercially available as they are not described in the table, and the parts used in the examples and comparative examples are parts by mass.
TABLE 1 raw material specification and model table
| Name (R) | Model number | Manufacturer/component |
| Acrylic resin | 620B | Root of Japanese Ralstonia |
| Hydrogenated styrene-butadiene block copolymers | G1651 | American Keteng |
| Thermoplastic polyurethane elastomer rubber | 385SX | Scientific wound of Germany |
Example 1
The present embodiment provides a lithium battery separator having a structure as shown in fig. 1, which is mainly composed of a base film 2 having a hole 3 and an organic elastic material coating layer 1 attached to the surface of the base film. The preparation method comprises the following specific steps:
and 3, drying the diaphragm prepared in the step 2 at 60 ℃ for 1h to obtain the lithium battery diaphragm.
Example 2
The embodiment provides a lithium battery diaphragm, which is prepared by the following specific steps:
and 3, drying the diaphragm prepared in the step 2 at 60 ℃ for 1h to obtain the lithium battery diaphragm.
Example 3
The embodiment provides a lithium battery diaphragm, which is prepared by the following specific steps:
and 3, drying the diaphragm prepared in the step 2 at 60 ℃ for 1h to obtain the lithium battery diaphragm.
Example 4
The embodiment provides a lithium battery diaphragm, which is prepared by the following specific steps:
and 3, drying the diaphragm prepared in the step 2 at 60 ℃ for 1h to obtain the lithium battery diaphragm.
Example 5
This example provides a lithium battery separator, which is different from example 4 in that 10 parts of acrylic resin is mixed with 90 parts of water, and the rest steps are the same as those in example 4 and are not repeated herein.
Example 6
This example provides a lithium battery separator, which is different from example 4 in that 30 parts of acrylic resin is mixed with 70 parts of water, and the rest steps are the same as example 4 and are not repeated herein.
Example 7
This example provides a lithium battery separator, which is different from example 4 in that 90 parts of acrylic resin is added to 10 parts of water and mixed, and the rest steps are the same as example 4 and are not repeated herein.
Example 8
This example provides a lithium battery separator, which is different from example 4 in that 50 parts of acrylic resin is added to 50 parts of ethanol and mixed, and the rest steps are the same as example 4 and are not repeated herein.
Example 9
This example provides a lithium battery separator, which is different from example 4 in that 50 parts of acrylic resin is added to 50 parts of n-amyl acetate and mixed, and the rest steps are the same as example 4 and are not repeated herein.
Example 10
The present embodiment provides a lithium battery separator, which is different from embodiment 4 in that the thickness of the lithium battery separator formed after drying the organic elastic material coating is 15 μm, and the remaining steps are the same as those in embodiment 4, and are not described herein again.
Example 11
The present embodiment provides a lithium battery separator, which is different from embodiment 4 in that the thickness of the lithium battery separator formed after drying the organic elastic material coating is 30 μm, and the remaining steps are the same as those in embodiment 4, and are not described herein again.
Example 12
The present embodiment provides a lithium battery separator, which is different from embodiment 4 in that an organic elastic material solution is uniformly coated on the front and back sides of a 12 μm polyethylene film base film, and the remaining steps are the same as those in embodiment 4, and are not described herein again.
Example 13
The embodiment provides a lithium battery diaphragm, which is prepared by the following specific steps:
step 4, uniformly coating the organic elastic material solution on one side of a polyethylene film base film with the thickness of 12 microns;
and 5, drying the diaphragm prepared in the step 4 at 60 ℃ for 1h to obtain the lithium battery diaphragm.
Comparative example 1
This comparative example provides a lithium battery separator which is a polyethylene film without a composite coating layer and has a thickness of 12 μm.
Comparative example 2
The comparative example provides a lithium battery separator, which is specifically prepared by the following steps:
And 2, spraying the ceramic powder mixture obtained in the step 1 on two sides of a polyethylene film base film with the thickness of 12 microns, wherein the spraying thickness is 1 micron, and thus obtaining the lithium battery diaphragm with the ceramic powder sprayed with the polyethylene film.
Test example 1
The lithium battery diaphragm obtained in the embodiment 1-11 and the comparative example 1-2 is assembled with the positive and negative pole pieces to prepare a lithium battery, and the obtained lithium battery is subjected to electrochemical test. The test contents include a tensile strength test, a puncture resistance strength test and a liquid absorption test. The specific test method is as follows:
and (3) testing tensile strength: the diaphragm is placed on a cutting machine and cut into strip-shaped test sample strips with the width of 15mm, the strips are marked at the intervals of 10cm between the test sample strips, the diaphragm sample is fixed on a universal testing machine, the measurement is started, the stress-strain curve is recorded in the process that the diaphragm is pulled to be broken, the tensile strength value of the diaphragm sample is obtained, each group of samples are tested repeatedly for 5 times, the average value is obtained, and the results are listed in table 2.
And (3) testing puncture resistance strength: during testing, the diaphragm sample is fixed on a universal testing machine, a needle head device with the diameter of 2mm is used for pricking the diaphragm sample at the speed of 50mm/min, a stress-strain curve is recorded, the puncture strength value of the diaphragm sample is obtained, each group of samples are tested repeatedly for 5 times, the average value is obtained, and the results are listed in table 2. Fig. 2 is a graph showing the puncture resistance effect of the lithium battery separator provided in example 4.
And (3) liquid absorption amount test: during testing, the diaphragm sample is cut into a certain size, soaked in the electrolyte for 0.5h at normal temperature, the weight difference of the diaphragm sample per unit area before and after soaking is the liquid absorption amount, and the obtained results are listed in table 2.
TABLE 2 diaphragm Performance test Table
Test example 2
The organic elastic material coating layer obtained in example 4 was vertically fixed on a jig, and the organic elastic material coating layer was slowly pierced with a ball point pen. A photograph of the deformation thereof is taken. As can be seen from fig. 2, the organic elastic material coating has high deformation elongation and puncture resistance, which proves that the lithium battery separator provided by the invention has good mechanical properties.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A lithium battery diaphragm is characterized by comprising a base film and an organic elastic material coating covered on the base film; the tensile strength of the diaphragm in the transverse direction and the longitudinal direction is 200-300MPa, the elongation at break is 80-150%, and the puncture resistance strength is more than 950 GF.
2. The lithium battery separator according to claim 1, wherein the organic elastic material coating layer comprises an organic elastic material;
preferably, the organic elastic material includes at least one of an acrylic resin, a hydrogenated styrene-butadiene block copolymer, and a thermoplastic polyurethane elastomer rubber.
3. The lithium battery separator according to claim 2, wherein the organic elastic material coating layer has a thickness of 1 to 15 μm.
4. The lithium battery separator as claimed in claim 2, wherein the acrylic resin is a type of japanese Ruikang 620B;
preferably, the hydrogenated styrene-butadiene block copolymer is a type of kraton G1651;
preferably, the thermoplastic polyurethane elastomer rubber is of the type german scientific 385 SX.
5. The lithium battery separator according to claim 2, wherein the base film comprises a polyolefin separator;
preferably, the polyolefin separator includes one of a polypropylene separator, a polyethylene separator, or a composite separator composed of polypropylene and polyethylene.
6. The lithium battery separator according to claim 2, wherein the organic elastic material coating layer is formed by coating and drying an organic elastic material solution;
preferably, the solvent of the organic elastomeric material solution includes at least one of water, ethanol, and n-amyl acetate.
7. The lithium battery separator according to claim 6, wherein the organic elastic material in the organic elastic material solution is 20 to 80% by mass, and the balance is a solvent;
preferably, the organic elastic material solution contains 30-50% by mass of the organic elastic material and the balance of the solvent.
8. The method for preparing a lithium battery separator according to any one of claims 1 to 7, wherein the lithium battery separator is obtained by coating an organic elastic material solution on the surface of a base film and drying the coated base film;
wherein an organic elastic material solution is coated on at least one surface of the base film.
9. The method for preparing a lithium battery separator according to claim 8, wherein the organic elastic material solution is obtained by uniformly dispersing the organic elastic material in a solvent;
preferably, the means of dispersing comprises stirring;
preferably, the stirring speed is 500-;
preferably, the drying temperature is 50-70 ℃, and the drying time is 5-60 min.
10. Use of a lithium battery separator according to any one of claims 1 to 7 or a lithium battery separator prepared by the method of preparation according to claim 8 or 9 in a lithium battery.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114243203A (en) * | 2021-12-01 | 2022-03-25 | 远景动力技术(江苏)有限公司 | High-elongation diaphragm, preparation method thereof and lithium ion battery |
| CN114243221A (en) * | 2021-12-23 | 2022-03-25 | 中材锂膜有限公司 | High-elasticity deformation diaphragm and preparation method thereof |
| CN114976489A (en) * | 2022-07-01 | 2022-08-30 | 珠海冠宇电池股份有限公司 | Coating and diaphragm and battery comprising same |
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