CN112018313B - High-temperature-resistant and high-air-permeability lithium battery coating diaphragm and preparation method thereof - Google Patents
High-temperature-resistant and high-air-permeability lithium battery coating diaphragm and preparation method thereof Download PDFInfo
- Publication number
- CN112018313B CN112018313B CN202010980289.3A CN202010980289A CN112018313B CN 112018313 B CN112018313 B CN 112018313B CN 202010980289 A CN202010980289 A CN 202010980289A CN 112018313 B CN112018313 B CN 112018313B
- Authority
- CN
- China
- Prior art keywords
- ceramic powder
- diaphragm
- lithium battery
- modified ceramic
- base film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm and a preparation method thereof. The lithium battery coating diaphragm comprises a base film, and the surface of the base film is provided with a coating layer formed by coating modified ceramic slurry. The preparation method comprises (1) modifying ceramic powder with acid etching agent to obtain modified ceramic powder with concave-convex cavity on surface; (2) blending a framework agent with a multi-dimensional structure, modified ceramic powder and a binder to obtain modified ceramic slurry; (3) and coating the modified ceramic slurry on the surface of the base film, and drying to obtain the lithium battery coating diaphragm. The structural agent with the multi-dimensional structure is hooked with the ceramic powder with concave-convex surfaces to form a supporting structure with higher porosity, and the high porosity endows the diaphragm with the characteristics of excellent air permeability and low impedance; the adhesive with high-temperature softening temperature can make the diaphragm more resistant to high temperature and keep the size not deformed; the lithium battery coating diaphragm prepared by the scheme has the characteristics of high temperature resistance, excellent air permeability, low impedance and strong safety performance.
Description
Technical Field
The invention relates to the technical field of lithium battery diaphragm production, in particular to a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm and a preparation method thereof.
Background
The diaphragm is one of four materials in the lithium battery, plays a role in isolating the positive electrode and the negative electrode in the battery and providing a passage for lithium ion migration, and lithium battery manufacturers have higher and higher requirements on the diaphragm along with the continuous development of the industry, wherein a more key index is the high-temperature-resistant size stability of the diaphragm, which determines the safety performance of the battery. The main material of lithium battery diaphragm is PE or PP, because the characteristic of its material itself, just can soften when the high temperature, and high temperature dimensional stability can be relatively poor, and the mode of coating one deck ceramic coating on the diaphragm surface is generally adopted in the present trade, restraines the thermal contraction of diaphragm substrate to reach diaphragm high temperature dimensional stability can.
At present, a ceramic coating is mostly coated on the surface of a base film, but due to the appearance problem of ceramic powder in the ceramic coating, the porosity of the coated diaphragm is reduced, the ventilation value of the diaphragm is increased, the charge and discharge performance of the battery is influenced, and the impedance of the battery is increased. Meanwhile, the surface of the ceramic powder is smooth, obvious concave-convex points do not exist, the ceramic powder cannot be effectively adhered with other additives, and the high-temperature resistance of the diaphragm after coating cannot be effectively exerted.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm and a preparation method thereof, and aims to solve the problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme: the lithium battery coating diaphragm comprises a base film, and a coating layer formed by coating modified ceramic slurry is arranged on the surface of the base film.
Further, the method comprises the following steps of; the modified ceramic slurry is mainly prepared from 60-70 parts by weight of modified ceramic powder, 37-46 parts by weight of binder and 25-32 parts by weight of framework agent.
Further, the method comprises the following steps of; the modified ceramic powder is prepared by reacting ceramic powder with an acid etching agent;
further, the method comprises the following steps of; the mass ratio of the ceramic powder to the acid etching agent is 1.6-19: 1;
further, the method comprises the following steps of; the acid etching agent is one or more of acetic acid, oxalic acid, carbonic acid, hypochlorous acid, hydrosulfuric acid, phosphoric acid and silicic acid; further, the method comprises the following steps of; the pH value of the acid etching agent is 5.0-7.0.
Further, the method comprises the following steps of; the binder is one or more of polyacrylate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate, acrylonitrile copolymer, acrylic acid-acrylonitrile copolymer and modified PMMA; the high-temperature softening temperature of the adhesive is more than 150 ℃.
According to the technical scheme, weak acids such as acetic acid, oxalic acid and carbonic acid are selected, the surface of the ceramic powder is corroded by the weak acids, a concave-convex structure can be formed, the ceramic powder with the concave-convex structure is more easily combined with the framework agent and the binder, and the stability of the film is improved. In the technical scheme, the binder with the high-temperature softening temperature of more than 150 ℃ is selected, and the binder with the high-temperature softening temperature of 100 ℃ is generally selected in the prior art to only play a role in binding all components; the binder with the high-temperature softening temperature of more than 150 ℃ in the scheme not only plays a role in binding ceramic powder and a framework agent, but also can play an effective supporting role, and has a positive effect on improving the porosity of the coating.
The cellulose with a multi-dimensional structure is selected as a framework agent and is combined with ceramic powder with concave-convex surfaces and a binding agent to form modified ceramic slurry, and after coating, the cellulose molecules and the binding agent with the multi-dimensional structure can support the ceramic powder, so that the porosity of a coating is increased, and the air permeability of the lithium battery coating diaphragm is improved.
Further, the method comprises the following steps of; the structural agent is one or more of sodium carboxymethyl cellulose, carboxymethyl cellulose ammonium, carboxyethyl cellulose and carboxypropyl methyl fiber;
further, the method comprises the following steps of; the molecular weight of the framework agent is 10-100 ten thousand.
Further, the method comprises the following steps of; the base membrane is one or more of a polyolefin membrane, a non-woven fabric membrane and a PI membrane, preferably, the base membrane is a polyolefin membrane;
further, the method comprises the following steps of; the porosity of the polyolefin diaphragm is 40-60%;
further, the method comprises the following steps of; the pore diameter of the polyolefin diaphragm is 40-150 nm;
further, the method comprises the following steps of; the coefficient of friction of the surface of the polyolefin diaphragm is 0.1-0.3.
Preferably, the polyolefin diaphragm with the porosity of 40-60%, the pore diameter of 40-150 nm and the friction coefficient of 0.1-0.3 is used as a base film, the base film has large surface friction and uneven structure under the optimized parameters, and can be easily hooked and combined with a binder and a structural agent, so that the binding force of a coating and the polyolefin diaphragm is increased, and the stability of the lithium battery coating diaphragm is improved.
Further: the ceramic powder is one or more of aluminum oxide, silicon oxide, boehmite, magnesium hydroxide and titanium oxide;
further, the method comprises the following steps of; the specific area BET of the ceramic powder is 4-20 square meters per gram;
further, the method comprises the following steps of; the particle size of the ceramic powder is 0.3-3 um;
further, the method comprises the following steps of; the purity of the ceramic powder is more than 90 percent;
through multiple tests and demonstration, the optimal BET range of the ceramic powder is 4-20 square meters per gram, when the specific surface area of the ceramic powder is too small, reactive sites of the ceramic powder and an acid etching agent can be reduced, the reduction of the reactive sites causes the reduction of a concave-convex structure on the surface of the ceramic powder, and finally, the air permeability of a lithium battery coating diaphragm is reduced; the larger the specific surface area of the ceramic powder is, the more active sites are reacted with the acid etching agent, so that more stable concave-convex structures are formed on the surface of the ceramic powder, and the air permeability of the lithium battery coating film is improved; when the specific area of the ceramic powder is too large, the catalytic efficiency of the catalyst is lowered. According to the technical scheme, the optimal range of the specific surface area of the ceramic powder is determined to be 4-20 square meters per gram through multiple tests and argumentations.
In addition, the purity of the ceramic powder in the technical scheme is more than 90 percent; the purity of the ceramic powder directly influences the service performance of the battery, and when the purity is less than 90%, the frequency of short circuit of the battery is increased, and the reaction effect of the ceramic powder and the acid etching agent is weakened.
A preparation method of a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into an acid etching agent, stirring, and reacting for 45-60 min; drying at 100-350 ℃ to prepare modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving the structuring agent in water or an organic solvent, adding the modified ceramic powder, and stirring; adding a binder, and dispersing at a high speed of 1000-; preparing modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, wherein the thickness of the coating is 1.5-6 mu m, and the coating is dried and rolled at the temperature of 50-90 ℃ to prepare the high-temperature-resistant and high-air-permeability lithium battery coated diaphragm.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the ceramic powder is subjected to acid etching modification treatment by adopting weak acid, so that more concave-convex structures are formed on the surface of the ceramic powder; the surface modified ceramic powder is mixed with a framework agent with a multidimensional structure and a binder with higher high-temperature softening temperature to form modified ceramic slurry, and the modified ceramic slurry is coated on a base film; because the structural agent with the multi-dimensional structure is hooked with the ceramic powder with concave-convex surfaces, an internal supporting structure can be formed after the coating is dried, and the porosity of the coating is increased, so that the characteristics of high air permeability, dimensional stability and low impedance are given to the lithium battery coating diaphragm; the binder with higher high-temperature softening temperature not only improves the high-temperature resistance of the lithium battery coated diaphragm, but also can play a role in supporting; therefore, the lithium battery coating diaphragm prepared by the invention has the characteristics of high temperature resistance, high air permeability and low impedance.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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
The high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises a base film, wherein a coating layer formed by coating modified ceramic slurry is arranged on the surface of the base film.
The modified ceramic slurry is mainly prepared from 15 parts of modified ceramic powder, 1 part of binder and 1 part of framework agent by weight.
The modified ceramic powder is prepared by reacting ceramic powder with an acid etching agent; the mass ratio of the ceramic powder to the acid etching agent is 1.6: 1. The specific area BET of the ceramic powder is 4 square meters per gram, the particle size is 0.3um, and the purity is 98 percent;
the pH value of the acid etching agent is 5.0; the molecular weight of the structuring agent is 10 ten thousand; the high temperature softening temperature of the adhesive is 160 ℃.
The base film is a polyolefin diaphragm; the porosity was 40%, the pore diameter was 40nm, and the friction coefficient was 0.1.
A preparation method of a high-temperature-resistant and high-permeability lithium battery coating diaphragm comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into an acid etching agent, stirring, and reacting for 45 min; drying at 100 ℃ to prepare modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving the structuring agent in water or an organic solvent, adding the modified ceramic powder, and stirring; adding a binder, and dispersing at a high speed of 1000r/min for 25 min; preparing modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, drying and rolling at the coating thickness of 1.5 mu m and the temperature of 50 ℃ to obtain the high-temperature-resistant and high-air-permeability lithium battery coating diaphragm.
Example 2
The high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises a base film, wherein a coating layer formed by coating modified ceramic slurry is arranged on the surface of the base film.
The modified ceramic slurry is mainly prepared from 45 parts of modified ceramic powder, 8 parts of binder and 9 parts of framework agent by weight.
The modified ceramic powder is prepared by reacting ceramic powder with an acid etching agent; the mass ratio of the ceramic powder to the acid etching agent is 9: 1. The specific area BET of the ceramic powder is 9 square meters per gram, the particle size is 1.2um, and the purity is 99 percent;
the pH value of the acid etching agent is 6.2; the molecular weight of the structuring agent is 50 ten thousand; the high-temperature softening temperature of the adhesive is 180 ℃.
The base film is a polyolefin diaphragm; the porosity was 52%, the pore diameter was 75nm, and the friction coefficient was 0.2.
A preparation method of a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into the acid etching agent, stirring, and reacting for 48 min; drying at 225 ℃ to prepare modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving the structuring agent in water or an organic solvent, adding the modified ceramic powder, and stirring; adding the binder, and dispersing at a high speed of 3500r/min for 30 min; preparing modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, drying and rolling at the temperature of 75 ℃ and the thickness of the coating layer being 5 mu m to obtain the high-temperature-resistant and high-air-permeability lithium battery coating diaphragm.
Example 3
The high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises a base film, wherein a coating layer formed by coating modified ceramic slurry is arranged on the surface of the base film.
The modified ceramic slurry is mainly prepared from 50 parts by weight of modified ceramic powder, 15 parts by weight of binder and 15 parts by weight of framework agent.
The modified ceramic powder is prepared by reacting ceramic powder with an acid etching agent; the mass ratio of the ceramic powder to the acid etching agent is 10: 1. The specific area BET of the ceramic powder is 20 square meters per gram, the particle size is 3 mu m, and the purity is 99 percent;
the pH value of the acid etching agent is 7.0; the molecular weight of the structuring agent is 100 ten thousand; the high-temperature softening temperature of the adhesive is 180 ℃.
The base film is a polyolefin diaphragm; the porosity was 60%, the pore diameter was 150nm, and the friction coefficient was 0.3.
A preparation method of a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into an acid etching agent, stirring, and reacting for 60 min; drying at 350 ℃ to prepare modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving the structuring agent in water or an organic solvent, adding the modified ceramic powder, and stirring; adding a binder, and dispersing at a high speed of 5000r/min for 40 min; preparing modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, drying and rolling at the temperature of 90 ℃ and the thickness of the coating layer being 6 microns to obtain the high-temperature-resistant and high-air-permeability lithium battery coating diaphragm.
Comparative example 1
The high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises a base film, wherein a coating layer formed by coating modified ceramic slurry is arranged on the surface of the base film.
The modified ceramic slurry is mainly prepared from 50 parts by weight of ceramic powder, 15 parts by weight of binder and 15 parts by weight of framework agent.
The specific area BET of the ceramic powder is 20 square meters per gram, the particle size is 3 mu m, and the purity is 99 percent;
the base film is a polyolefin diaphragm; the porosity was 60%, the pore diameter was 150nm, and the friction coefficient was 0.3.
A preparation method of a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises the following steps;
(1) preparing ceramic slurry; dissolving the structuring agent in water or an organic solvent, adding ceramic powder, and stirring; adding a binder, and dispersing at a high speed of 5000r/min for 40 min; preparing ceramic slurry;
(2) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and (3) uniformly coating the ceramic slurry on the surface of the base film, wherein the thickness of the coating is 6 microns, and the coating is dried and rolled at the temperature of 90 ℃ to prepare the high-temperature-resistant and high-air-permeability lithium battery coating diaphragm.
In comparative example 1, the ceramic powder was not acid-etched by an acid etching agent, and the rest was the same as in example 3.
Comparative example 2
The lithium battery coating diaphragm comprises a base film, wherein a coating layer formed by coating modified ceramic slurry is arranged on the surface of the base film.
The modified ceramic slurry is mainly prepared from 50 parts by weight of modified ceramic powder and 15 parts by weight of binder.
The modified ceramic powder is prepared by reacting ceramic powder with an acid etching agent; the mass ratio of the ceramic powder to the acid etching agent is 10: 1. The specific area BET of the ceramic powder is 20 square meters per gram, the particle size is 3 mu m, and the purity is 99 percent;
the pH value of the acid etching agent is 7.0; the high-temperature softening temperature of the adhesive is 180 ℃.
The base film is a polyolefin diaphragm; the porosity was 60%, the pore diameter was 150nm, and the friction coefficient was 0.3.
A preparation method of a high-temperature-resistant and high-air-permeability lithium battery coating diaphragm comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into an acid etching agent, stirring, and reacting for 60 min; drying at 140 ℃ to prepare modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving the modified ceramic powder in water, and stirring; adding a binder, and dispersing at a high speed of 5000r/min for 40 min; preparing modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, wherein the thickness of the coating is 6 microns, and the coating is dried and rolled at the temperature of 90 ℃ to prepare the high-temperature-resistant and high-air-permeability lithium battery coating diaphragm.
In comparative example 2, no structuring agent was added, and the rest was the same as in example 3.
Comparative example 3
The procedure of example 3 was repeated, except that the high-temperature softening temperature of the binder was 110 ℃.
Comparative example 4
The procedure of example 3 was repeated, except that the high-temperature softening temperature of the binder was 100 ℃.
Comparative example 5
The contents are the same as those in example 3 except that the ceramic powder has a specific area BET of 3 square meters per gram.
Comparative example 6
The contents are the same as those in example 3 except that the specific area BET of the ceramic powder is 1 square meter per gram.
Comparative example 7
The contents are the same as those in example 3 except that the ceramic powder specific area BET is 21 square meters per gram.
Comparative example 8
The contents are the same as those in example 3 except that the ceramic powder has a specific area BET of 25 square meters per gram.
Comparative example 9
The procedure of example 3 was repeated except that the acid etching agent was sulfuric acid.
Comparative example 10
The procedure of example 3 was repeated except that the acid etching agent was hydrochloric acid.
Experimental comparison and analysis
The lithium battery coating separators prepared in examples 1 to 3 and comparative examples 1 to 10 were subjected to a performance test; the performance of the battery diaphragm is detected by using a Gurley value tester, an ohmmeter, a universal testing machine and an oven, and the detection result is shown in table 1;
TABLE 1
As can be seen from the data in Table 1, comparative examples 1-2 are weaker than examples 1-3 in air permeability, resistance and thermal shrinkage performance than the examples, so that the mutual synergistic action of the acid etching agent, the structuring agent and the binder in the solution can achieve the optimal performance of the battery separator, and the battery separator performance is weakened in the absence of any one of the acid etching agent, the structuring agent and the binder. Comparative examples 5 to 8 compared with examples 1 to 3, the battery separators prepared in comparative examples 5 to 8 were slightly inferior in peel force, heat shrinkage property, and resistance property; therefore, the BET specific surface area of the ceramic powder in the technical scheme is the optimal range of 4-20 square meters per gram. Comparative examples 3 to 4 are inferior to examples 1 to 3 in heat shrinkage performance, and thus it is also demonstrated that the high temperature softening temperature of the adhesive is better than 150 ℃. Compared with the examples 1 to 3, the comparative examples 9 to 10 have far inferior performances, particularly air permeability, to those of the examples 1 to 3, so that the adoption of the weak acid etching ceramic powder in the scheme can bring more concave-convex structures and improve the air permeability of the diaphragm.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A high temperature resistant, high permeability lithium battery coated diaphragm, characterized by; the lithium battery coating diaphragm comprises a base film, wherein the surface of the base film is provided with a coating layer formed by coating modified ceramic slurry;
the modified ceramic slurry is mainly prepared from the following raw materials, by weight, 15-50 parts of modified ceramic powder, 1-15 parts of binder and 1-15 parts of structural agent;
the modified ceramic powder is prepared by reacting ceramic powder with an acid etching agent;
the mass ratio of the ceramic powder to the acid etching agent is 1.6-19: 1;
the ceramic powder is one or more of aluminum oxide, silicon oxide, boehmite, magnesium hydroxide and titanium oxide;
the specific area BET of the ceramic powder is 4-20 square meters per gram;
the particle size of the ceramic powder is 0.3-3 um;
the purity of the ceramic powder is more than 90 percent.
2. The high temperature resistant, high gas permeable lithium battery coated separator of claim 1, wherein: the acid etching agent is one or more of acetic acid, oxalic acid, carbonic acid, hypochlorous acid, hydrosulfuric acid, phosphoric acid and silicic acid;
the pH value of the acid etching agent is 5.0-7.0.
3. The high temperature resistant, high gas permeable lithium battery coated separator of claim 1, wherein: the binder is one or more of polyacrylate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate, acrylonitrile copolymer, acrylic acid-acrylonitrile copolymer and modified PMMA.
4. The high temperature resistant, high gas permeable lithium battery coated separator of claim 1, wherein: the structural agent is one or more of sodium carboxymethyl cellulose, carboxymethyl cellulose ammonium, carboxyethyl cellulose and carboxypropyl methyl fiber; the molecular weight of the framework agent is 10-100 ten thousand.
5. The high temperature resistant, high gas permeable lithium battery coated separator of claim 1, wherein: the base film is a polyolefin diaphragm;
the porosity of the polyolefin diaphragm is 40-60%;
the pore diameter of the polyolefin diaphragm is 40-150 nm;
the coefficient of friction of the surface of the polyolefin diaphragm is 0.1-0.3.
6. The method for preparing a high temperature resistant, highly air permeable lithium battery coated separator according to claim 1, wherein: comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into the acid etching agent, stirring, and drying at high temperature to obtain modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving a structuring agent in water or an organic solvent, adding modified ceramic powder, stirring, adding a binder, and dispersing at a high speed to obtain modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, drying and rolling to obtain the high-temperature-resistant and high-air-permeability lithium battery coating diaphragm.
7. The method for preparing a high temperature resistant, highly air permeable lithium battery coated separator as claimed in claim 6, wherein: comprises the following steps;
(1) preparing modified ceramic powder; adding the ceramic powder into an acid etching agent, stirring, and reacting for 45-60 min; drying at 100-350 ℃ to prepare modified ceramic powder;
(2) preparing modified ceramic slurry; dissolving the structuring agent in water or an organic solvent, adding the modified ceramic powder, and stirring; adding a binder, and dispersing at a high speed of 1000-; preparing modified ceramic slurry;
(3) preparing a finished coated diaphragm product; taking a base film, and wiping the surface of the base film; and uniformly coating the modified ceramic slurry on the surface of the base film, wherein the thickness of the coating is 1.5-6 mu m, and the coating is dried and rolled at the temperature of 50-90 ℃ to prepare the high-temperature-resistant and high-air-permeability lithium battery coated diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010980289.3A CN112018313B (en) | 2020-09-17 | 2020-09-17 | High-temperature-resistant and high-air-permeability lithium battery coating diaphragm and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010980289.3A CN112018313B (en) | 2020-09-17 | 2020-09-17 | High-temperature-resistant and high-air-permeability lithium battery coating diaphragm and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112018313A CN112018313A (en) | 2020-12-01 |
| CN112018313B true CN112018313B (en) | 2022-06-03 |
Family
ID=73522990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010980289.3A Active CN112018313B (en) | 2020-09-17 | 2020-09-17 | High-temperature-resistant and high-air-permeability lithium battery coating diaphragm and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112018313B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736364B (en) * | 2020-12-28 | 2022-08-12 | 惠州亿纬创能电池有限公司 | Composite diaphragm and preparation method and application thereof |
| CN113764820B (en) * | 2021-09-07 | 2022-09-23 | 广东九彩新材料有限公司 | Preparation method of composite high-temperature-resistant lithium battery diaphragm material |
| CN114716907A (en) * | 2022-04-19 | 2022-07-08 | 安徽利科新材料科技有限公司 | Preparation method and application of bio-based polymer composite PMMA lithium battery diaphragm coating liquid |
| CN115863917B (en) * | 2022-12-09 | 2023-07-04 | 惠州市数威科技有限公司 | Preparation method of ceramic coated diaphragm and application of ceramic coated diaphragm in lithium battery |
| CN116073073B (en) * | 2023-03-09 | 2023-06-13 | 合肥长阳新材料科技有限公司 | High-liquid-absorption lithium battery diaphragm and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953049A (en) * | 2017-01-20 | 2017-07-14 | 东莞市卓高电子科技有限公司 | A kind of preparation method of the ceramic coating membrane of high security |
| CN109192903A (en) * | 2018-08-20 | 2019-01-11 | 合肥国轩高科动力能源有限公司 | A kind of preparation method of lithium ion battery coating modification ceramic coating membrane |
| CN111554855A (en) * | 2020-05-15 | 2020-08-18 | 江苏厚生新能源科技有限公司 | High-porosity coating diaphragm, preparation method thereof, ceramic coating and lithium battery |
-
2020
- 2020-09-17 CN CN202010980289.3A patent/CN112018313B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953049A (en) * | 2017-01-20 | 2017-07-14 | 东莞市卓高电子科技有限公司 | A kind of preparation method of the ceramic coating membrane of high security |
| CN109192903A (en) * | 2018-08-20 | 2019-01-11 | 合肥国轩高科动力能源有限公司 | A kind of preparation method of lithium ion battery coating modification ceramic coating membrane |
| CN111554855A (en) * | 2020-05-15 | 2020-08-18 | 江苏厚生新能源科技有限公司 | High-porosity coating diaphragm, preparation method thereof, ceramic coating and lithium battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112018313A (en) | 2020-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112018313B (en) | High-temperature-resistant and high-air-permeability lithium battery coating diaphragm and preparation method thereof | |
| CN108598341B (en) | Low-permeability ceramic coating diaphragm for lithium ion battery and preparation method thereof | |
| CN110993866B (en) | High-temperature-resistant thermal-shrinkage-resistant lithium battery diaphragm and preparation method thereof | |
| CN106887569A (en) | A kind of new structure graphene coated nano silicon particles and preparation method thereof | |
| CN108598413A (en) | Preparation method and silicon-based anode active material, the lithium ion battery negative material and lithium ion battery of silicon-based anode active material | |
| CN110797494A (en) | Diaphragm functional coating material for lithium ion battery and preparation method thereof | |
| CN101760049A (en) | Method for preparing core-shell silicon dioxide-coated ammonium polyphosphate (APP) | |
| CN112290161A (en) | Ultralow-moisture ceramic-coated lithium ion battery diaphragm and preparation method thereof | |
| TW201351758A (en) | Isolation film of electrochemical device and manufacturing method thereof | |
| CN108807803A (en) | Battery separator and preparation method thereof | |
| JP2020087910A (en) | Negative electrode material in which nano-silicon having multi-layer graphene as carrier is coated with silicon suboxide and amorphous carbon layer, and manufacturing method thereof | |
| CN110197883B (en) | Inorganic diaphragm for lithium ion battery and preparation method | |
| CN111600000A (en) | Carbon nanotube graphene/silicon carbon composite material, and preparation method and application thereof | |
| CN106450115A (en) | Inorganic coated bacterial cellulose porous thin film and preparation method thereof | |
| CN114122617B (en) | Thermal closed cell composite diaphragm and preparation method and application thereof | |
| CN114122620B (en) | Lithium ion battery diaphragm with high flame retardance, high mechanical strength and high bonding performance and preparation method | |
| CN112142453B (en) | Low-moisture alumina ceramic diaphragm, powder, slurry, preparation process and lithium battery | |
| CN108448028B (en) | Lithium ion battery diaphragm and preparation method thereof | |
| CN104562261A (en) | Novel far infrared fiber spinning solution and preparation method thereof | |
| CN109671894B (en) | Low water content separator and method for producing same | |
| CN104103793B (en) | A kind of preparation method of fire-retardant organic/inorganic composite diaphragm | |
| CN114512765A (en) | Low-moisture high-heat-resistance lithium battery diaphragm and preparation method thereof | |
| CN109346692A (en) | A kind of lithium ion battery negative material and preparation method thereof | |
| CN114231105A (en) | Low-moisture high-insulation lithium ion battery diaphragm and preparation method thereof | |
| CN110627411B (en) | Ceramic slurry for high-temperature-resistant lithium ion battery diaphragm and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |