CN112018314A - Lithium-rich lithium battery coating diaphragm and preparation method thereof - Google Patents
Lithium-rich lithium battery coating diaphragm and preparation method thereof Download PDFInfo
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- CN112018314A CN112018314A CN202010980323.7A CN202010980323A CN112018314A CN 112018314 A CN112018314 A CN 112018314A CN 202010980323 A CN202010980323 A CN 202010980323A CN 112018314 A CN112018314 A CN 112018314A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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 discloses a lithium-rich lithium battery coating diaphragm and a preparation method thereof. The lithium-rich lithium battery coating diaphragm mainly comprises a substrate and a coating layer on the surface of the substrate. The slurry of the coating layer consists of 0.5-10 parts of cellulose lithium, 15-60 parts of polyvinylidene fluoride or ceramic powder and 1-10 parts of binder. The preparation method of the lithium-rich lithium battery coating diaphragm comprises the following steps of (1) mixing cellulose, lithium hydroxide, monochloroacetic acid and a solvent, and reacting at a certain temperature to generate cellulose lithium; (2) blending the lithium cellulose, polyvinylidene fluoride and a binder to obtain slurry; (3) and (3) taking a base material, carrying out high-voltage corona on the front surface and the back surface of the base material, uniformly coating the surface of the base material with slurry, and drying to obtain the lithium-rich lithium battery coating diaphragm. The lithium-rich lithium battery coating diaphragm prepared by the invention not only effectively forms free lithium ions which can move freely, but also greatly improves the lithium supplementing range and the lithium supplementing function of the diaphragm; meanwhile, the problem that the diaphragm coating falls off is avoided, so that the stability and the safety of the lithium battery are improved.
Description
Technical Field
The invention relates to the technical field of lithium battery diaphragms, in particular to a lithium-rich lithium battery coating diaphragm and a preparation method thereof.
Background
The diaphragm is used as 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 with the continuous development of the industry, lithium battery manufacturers have higher and higher requirements on the diaphragm.
The main material of 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 trade, restraines the thermal contraction of diaphragm substrate to reach diaphragm high temperature dimensional stability can. Meanwhile, in order to make the diaphragm have a lithium supplementing function, lithium ceramic powder is generally added in the ceramic coating, and although lithium-rich ceramic powder is added in the ceramic powder, lithium ions cannot effectively move in the ceramic powder, so that lithium ions which can freely move in an electrolyte are formed. Therefore, although the lithium-rich ceramic is added, the lithium supplementing function of the battery is limited; meanwhile, the lithium-rich ceramic powder cannot be uniformly dispersed in the ceramic powder, so that the lithium ion supplement position of the lithium-rich ceramic diaphragm is not uniform, and lithium dendrites are formed in the continuous use process, thereby affecting the safety performance of the lithium battery.
Disclosure of Invention
The invention aims to provide a lithium-rich lithium battery coating diaphragm and a preparation method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a lithium-rich lithium battery coating diaphragm comprises a substrate, wherein a coating layer formed by coating slurry is arranged on the surface of the substrate.
Further, the method comprises the following steps of; the slurry is prepared from the following raw materials, by weight, 0.5-10 parts of cellulose lithium, 15-60 parts of polyvinylidene fluoride and 1-10 parts of a binder;
the slurry can also be prepared from the following raw materials, by weight, 0.5-10 parts of lithium cellulose, 15-60 parts of ceramic powder and 1-10 parts of a binder.
Further, the method comprises the following steps of; the raw material components of the lithium cellulose are, by percentage, 1-20% of cellulose, 5-30% of lithium hydroxide, 10-20% of monochloroacetic acid and the balance of solvent.
Further: the cellulose is one or more of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl methyl cellulose; and the molecular weight of the cellulose is 5 to 10 ten thousand.
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 and acrylonitrile copolymer and modified PMMA.
Further, the method comprises the following steps of; the polyvinylidene fluoride is a vinylidene fluoride-trifluoroethylene copolymer or a vinylidene fluoride-tetrafluoroethylene copolymer;
further, the method comprises the following steps of; the molar ratio of vinylidene fluoride to trifluoroethylene in the polyvinylidene fluoride is 1:1-7: 3; the molar ratio of vinylidene fluoride to tetrafluoroethylene in the polyvinylidene fluoride is 1:1-7: 3; the molecular weight of the polyvinylidene fluoride is 10-100 ten thousand, and the crystallinity of the polyvinylidene fluoride is 30-80%.
Further, the method comprises the following steps of; the front surface and the back surface of the base material are subjected to high-voltage corona; the current value of the corona is 1-5A; the base material is one or more of a ceramic coating diaphragm, a polyolefin diaphragm, a non-woven fabric diaphragm, a PI diaphragm and a polypropylene diaphragm, and preferably the ceramic coating diaphragm or the polyolefin diaphragm; the porosity of the substrate is 30-60%.
According to the scheme, high-voltage corona treatment is carried out on the surface of the base material by using 1-5A high-voltage current, so that CH is formed on the molecular structure of the surface of the base material3Chemical bonds, which increase the polarity of the substrate surface and increase the adhesion of the coating to the substrate, thereby preventing the coating from peeling off and improving the stability of the battery.
A preparation method of a lithium-rich lithium battery coating diaphragm is characterized by comprising the following steps: comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting at the temperature of 20-80 ℃; cooling, carrying out solid-liquid separation, drying and crushing the solid phase to obtain the cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry;
(3) and (3) taking a base material, carrying out high-voltage corona on the front surface and the back surface of the base material, uniformly coating the slurry prepared in the step (2) on the surface of the base material, and drying to obtain the lithium-rich lithium battery coating diaphragm.
Further, a preparation method of the lithium-rich lithium battery coating diaphragm comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 1-3h at the temperature of 20-80 ℃; adjusting pH to 5.0-7.5, cooling to 10-30 deg.C, cooling for 20-120min, separating solid and liquid, drying and pulverizing solid phase to obtain cellulose lithium;
in the prior art, the purpose of lithium supplement is achieved by adding lithium ceramic powder in a ceramic coating; however, since lithium ions cannot be formed in the ceramic powder as lithium ions that freely move in the electrolyte, the effect of compensating lithium for the battery is limited. According to the technical scheme, the lithium hydroxide reacts with the cellulose to generate the cellulose lithium, the cellulose lithium can form free lithium ions in the slurry, the lithium supplementing range and the lithium supplementing effect are improved, and the capacity of the lithium battery is enhanced.
(2) Dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry.
(3) And (3) taking a base material, carrying out high-voltage corona on the front surface and the back surface of the base material, uniformly coating the slurry prepared in the step (2) on the surface of the base material, and drying to obtain the lithium-rich lithium battery coating diaphragm.
Further, the method comprises the following steps of; and the current value of the high-voltage corona in the step (3) is 1-5A.
Further, the method comprises the following steps of; the solvent in the step (1) is one or more of ethanol, methanol and propanol.
Compared with the prior artCompared with the prior art, the invention has the following beneficial effects: according to the invention, lithium hydroxide reacts with cellulose to generate cellulose lithium, and the cellulose lithium can form free lithium ions in the slurry, so that the lithium supplementing range and the lithium supplementing effect of the diaphragm after the slurry is coated to form a film are improved, and the capacity of the lithium battery is enhanced; in addition, before coating, the surface of the base material is subjected to high-voltage corona treatment by using 1-5A high-voltage current to form CH on the molecular structure of the surface of the base material3Chemical bonds, which increase the polarity of the substrate surface and increase the adhesion of the coating to the substrate, thereby preventing the coating from peeling off and improving the stability of the battery.
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
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from the following raw materials, by weight, 0.5 part of cellulose lithium, 15 parts of polyvinylidene fluoride and 1 part of a binder.
Wherein, the raw material components of the cellulose lithium comprise 1 percent of cellulose, 5 percent of lithium hydroxide, 10 percent of monochloroacetic acid and 84 percent of solvent.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 1h at the temperature of 20 ℃; adjusting pH to 5.0, cooling to 10 deg.C, cooling for 20min, separating solid and liquid, drying and pulverizing solid phase to obtain cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry.
(3) Taking a base material, and carrying out high-voltage corona on the front surface and the back surface of the base material, wherein the corona current value is 1A; and (3) uniformly coating the slurry prepared in the step (2) on the surface of a base material, and drying to prepare the lithium-rich lithium battery coating diaphragm.
Example 2
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from the following raw materials, by weight, 3.5 parts of cellulose lithium, 25 parts of polyvinylidene fluoride and 7 parts of a binder.
Wherein, the raw material components of the cellulose lithium comprise 10 percent of cellulose, 19 percent of lithium hydroxide, 18 percent of monochloroacetic acid and 53 percent of solvent.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 2.5 hours at the temperature of 58 ℃; adjusting the pH value to 6.3, cooling to 25 ℃, cooling for 90min, performing solid-liquid separation, and drying and crushing a solid phase to obtain cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry.
(3) Taking a base material, and carrying out high-voltage corona on the front surface and the back surface of the base material, wherein the corona current value is 3A; and (3) uniformly coating the slurry prepared in the step (2) on the surface of a base material, and drying to prepare the lithium-rich lithium battery coating diaphragm.
Example 3
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from the following raw materials, by weight, 10 parts of lithium cellulose, 60 parts of polyvinylidene fluoride and 10 parts of a binder.
Wherein, the raw material components of the cellulose lithium comprise 20% of cellulose, 30% of lithium hydroxide, 20% of monochloroacetic acid and 30% of solvent.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 3 hours at the temperature of 80 ℃; adjusting the pH value to 7.5, cooling to 30 ℃, cooling for 120min, performing solid-liquid separation, and drying and crushing a solid phase to obtain cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry.
(3) Taking a base material, and carrying out high-voltage corona on the front surface and the back surface of the base material, wherein the corona current value is 5A; and (3) uniformly coating the slurry prepared in the step (2) on the surface of a base material, and drying to prepare the lithium-rich lithium battery coating diaphragm.
Example 4
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from the following raw materials, by weight, 10 parts of lithium cellulose, 60 parts of ceramic powder and 10 parts of a binder.
Wherein, the raw material components of the cellulose lithium comprise 20% of cellulose, 30% of lithium hydroxide, 20% of monochloroacetic acid and 30% of solvent.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 3 hours at the temperature of 80 ℃; adjusting the pH value to 7.5, cooling to 30 ℃, cooling for 120min, performing solid-liquid separation, and drying and crushing a solid phase to obtain cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding ceramic powder, dispersing at a high speed, adding a binder, and stirring to obtain slurry.
(3) Taking a base material, and carrying out high-voltage corona on the front surface and the back surface of the base material, wherein the corona current value is 5A; and (3) uniformly coating the slurry prepared in the step (2) on the surface of a base material, and drying to prepare the lithium-rich lithium battery coating diaphragm.
Comparative example 1
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from the following raw materials, by weight, 10 parts of lithium cellulose, 60 parts of polyvinylidene fluoride and 10 parts of a binder.
Wherein, the raw material components of the cellulose lithium comprise 20% of cellulose, 30% of lithium hydroxide, 20% of monochloroacetic acid and 30% of solvent.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 3 hours at the temperature of 80 ℃; adjusting the pH value to 7.5, cooling to 30 ℃, cooling for 120min, performing solid-liquid separation, and drying and crushing a solid phase to obtain cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry.
(3) And (3) taking a base material, uniformly coating the slurry prepared in the step (2) on the surface of the base material, and drying to obtain the lithium-rich lithium battery coating diaphragm.
Comparative example 2
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from the following raw materials, by weight, 10 parts of lithium hydroxide, 60 parts of polyvinylidene fluoride and 10 parts of a binder.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(2) dissolving lithium hydroxide in water, stirring, adding polyvinylidene fluoride, dispersing at high speed, adding a binder, and stirring to obtain the slurry.
(3) And (3) taking a base material, uniformly coating the slurry prepared in the step (2) on the surface of the base material, and drying to obtain the lithium-rich lithium battery coating diaphragm.
Comparative example 3
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from 60 parts by weight of polyvinylidene fluoride and 10 parts by weight of binder.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(2) mixing polyvinylidene fluoride with water, stirring, adding a binder, and dispersing at a high speed to obtain the slurry.
(3) Taking a base material, and carrying out high-voltage corona on the front surface and the back surface of the base material, wherein the corona current value is 5A; and (3) uniformly coating the slurry prepared in the step (2) on the surface of a base material, and drying to prepare the lithium-rich lithium battery coating diaphragm.
Comparative example 4
A lithium-rich lithium battery coating diaphragm comprises a substrate, wherein the surface of the substrate is provided with a coating layer formed by coating slurry.
The slurry is prepared from 60 parts by weight of lithium-rich ceramic powder and 10 parts by weight of binder.
A preparation method of a lithium-rich lithium battery coating diaphragm comprises the following steps;
(2) dissolving the lithium-rich ceramic powder in water, dispersing at a high speed, adding a binder, and dispersing at a high speed to obtain slurry.
(3) Taking a base material, and carrying out high-voltage corona on the front surface and the back surface of the base material, wherein the corona current value is 5A; and (3) uniformly coating the slurry prepared in the step (2) on the surface of a base material, and drying to prepare the lithium-rich lithium battery coating diaphragm.
Experimental comparison and analysis
Examples 1-4 are the present protocol;
in comparative example 1, the substrate was not subjected to high voltage corona, and the rest was the same as in example 3;
in comparative example 2, lithium hydroxide was directly added to the slurry without substitution reaction with cellulose, and the rest was the same as in example 3;
in comparative example 3, the slurry was made up of only polyvinylidene fluoride and binder without addition of lithium cellulose, and the rest was the same as in example 3;
in comparative example 4, lithium-rich ceramic powder was directly added to the slurry to replace the lithium cellulose, and the rest was the same as in example 3;
test results
The performance test of the lithium battery coating membranes prepared in the examples 1-3 and the comparative examples 1-4 is carried out, and each group of membranes are detected according to the cycle performance test requirement of the battery, and the detection results are shown in the table 1;
| numbering | Battery capacity/ma.h | Cycle performance/time | Attenuation ratio | Peeling force N/m |
| Example 1 | 1205 | 2350 | 2.0％ | 78 |
| Example 2 | 1275 | 2500 | 1.9％ | 80 |
| Example 3 | 1280 | 2500 | 1.2％ | 82 |
| Comparative example 1 | 1120 | 2200 | 2.2％ | 78 |
| Comparative example 2 | 1060 | 2100 | 3.5％ | 78 |
| Comparative example 3 | 1000 | 1800 | 4.8％ | 55 |
| Comparative example 4 | 1080 | 1950 | 2.6％ | 62 |
TABLE 1
As can be seen from the data in Table 1, the battery separator batteries prepared in examples 1-3 have larger capacity, separator peeling force and cycle performance than those of comparative examples 1-4; and the damping ratio of the battery separator is less than that of comparative examples 1-4; thus, it is demonstrated that the battery separators prepared in examples 1-3 according to the present disclosure can expand the lithium supplement range of the separator due to the formation of free lithium ions in the slurry by the lithium cellulose, thereby enhancing the capacity, cycle performance and stability of the battery; in addition, the base film is subjected to high-voltage corona treatment before coating, so that the adhesion between the coating and the base material can be enhanced, and therefore, a high peeling force is provided to the separator.
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 (10)
1. A lithium-rich lithium battery coating diaphragm is characterized in that; the lithium-rich lithium battery coating diaphragm comprises a base material, wherein a coating layer formed by coating slurry is arranged on the surface of the base material.
2. The lithium-rich lithium battery coating separator as claimed in claim 1, wherein: the slurry is prepared from the following raw materials, by weight, 0.5-10 parts of cellulose lithium, 15-60 parts of polyvinylidene fluoride and 1-10 parts of a binder.
3. The lithium-rich lithium battery coating separator as claimed in claim 2, wherein: the raw material components of the lithium cellulose are, by percentage, 1-20% of cellulose, 5-30% of lithium hydroxide, 10-20% of monochloroacetic acid and the balance of solvent.
4. The lithium-rich lithium battery coating separator as claimed in claim 3, wherein: the cellulose is one or more of hydroxyethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl methyl cellulose.
5. The lithium-rich lithium battery coating separator as claimed in claim 3, wherein: the binder is one or more of polyacrylate, polyvinyl alcohol, ethylene-vinyl acetate copolymer, polyvinyl acetate, acrylonitrile copolymer, acrylic acid and acrylonitrile copolymer and modified PMMA.
6. The lithium-rich lithium battery coating separator as claimed in claim 2, wherein: the polyvinylidene fluoride is a vinylidene fluoride-trifluoroethylene copolymer or a vinylidene fluoride-tetrafluoroethylene copolymer;
the molar ratio of vinylidene fluoride to trifluoroethylene in the polyvinylidene fluoride is 1:1-7: 3;
the molar ratio of vinylidene fluoride to tetrafluoroethylene in the polyvinylidene fluoride is 1:1-7: 3.
7. A preparation method of a lithium-rich lithium battery coating diaphragm is characterized by comprising the following steps: comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting at the temperature of 20-80 ℃; cooling, carrying out solid-liquid separation, drying and crushing the solid phase to obtain the cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry;
(3) and (3) taking a base material, carrying out high-voltage corona on the front surface and the back surface of the base material, uniformly coating the slurry prepared in the step (2) on the surface of the base material, and drying to obtain the lithium-rich lithium battery coating diaphragm.
8. The method of claim 7, wherein the method comprises the steps of: comprises the following steps;
(1) preparing lithium cellulose: adding cellulose, lithium hydroxide and monochloroacetic acid into a solvent, and reacting for 1-3h at the temperature of 20-80 ℃; adjusting pH to 5.0-7.5, cooling to 10-30 deg.C, cooling for 20-120min, separating solid and liquid, drying and pulverizing solid phase to obtain cellulose lithium;
(2) dissolving the cellulose lithium prepared in the step (1) in water, stirring, adding polyvinylidene fluoride, dispersing at a high speed, adding a binder, and stirring to obtain a slurry;
(3) and (3) taking a base material, carrying out high-voltage corona on the front surface and the back surface of the base material, uniformly coating the slurry prepared in the step (2) on the surface of the base material, and drying to obtain the lithium-rich lithium battery coating diaphragm.
9. The method for preparing the lithium-rich lithium battery coating membrane as claimed in any one of claims 7 to 8, wherein the current value of the high-voltage corona in the step (3) is 1 to 5A.
10. The method for preparing the lithium-rich lithium battery coating separator as claimed in claim 9, wherein the solvent in the step (1) is one or more of ethanol, methanol and propanol.
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| CN202010980323.7A CN112018314A (en) | 2020-09-17 | 2020-09-17 | Lithium-rich lithium battery coating diaphragm and preparation method thereof |
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| CN202010980323.7A CN112018314A (en) | 2020-09-17 | 2020-09-17 | Lithium-rich lithium battery coating diaphragm and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410577A (en) * | 2021-05-20 | 2021-09-17 | 河北金力新能源科技股份有限公司 | High-temperature-resistant high-insulation high-cycle lithium battery diaphragm and preparation method thereof |
| CN114361718A (en) * | 2021-12-14 | 2022-04-15 | 乐凯胶片股份有限公司 | Diaphragm for lithium ion battery and lithium ion battery |
-
2020
- 2020-09-17 CN CN202010980323.7A patent/CN112018314A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410577A (en) * | 2021-05-20 | 2021-09-17 | 河北金力新能源科技股份有限公司 | High-temperature-resistant high-insulation high-cycle lithium battery diaphragm and preparation method thereof |
| CN114361718A (en) * | 2021-12-14 | 2022-04-15 | 乐凯胶片股份有限公司 | Diaphragm for lithium ion battery and lithium ion battery |
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