CN112635907A - Lithium ion battery diaphragm and preparation method thereof and lithium ion battery - Google Patents

Lithium ion battery diaphragm and preparation method thereof and lithium ion battery Download PDF

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Publication number
CN112635907A
CN112635907A CN202011521061.4A CN202011521061A CN112635907A CN 112635907 A CN112635907 A CN 112635907A CN 202011521061 A CN202011521061 A CN 202011521061A CN 112635907 A CN112635907 A CN 112635907A
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CN
China
Prior art keywords
lithium ion
ion battery
diaphragm
spinning
polyolefin
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CN202011521061.4A
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Chinese (zh)
Inventor
刘玮琼
陈萌
高二平
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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Priority to CN202011521061.4A priority Critical patent/CN112635907A/en
Publication of CN112635907A publication Critical patent/CN112635907A/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
    • D01D5/0015—Electro-spinning characterised by the initial state of the material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/0007—Electro-spinning
    • D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
    • D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
    • D01D5/0084—Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/66—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyethers
    • D01F6/665—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyethers from polyetherketones, e.g. PEEK
    • 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
    • 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 discloses a lithium ion battery diaphragm and a preparation method thereof and a lithium ion battery. The lithium ion battery diaphragm has excellent temperature resistance, wettability and ionic conductivity, and has high mechanical strength and application prospect.

Description

Lithium ion battery diaphragm and preparation method thereof and lithium ion battery
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery diaphragm and a preparation method thereof, and a lithium ion battery containing the lithium ion battery diaphragm.
Background
The lithium ion battery has a series of advantages of high energy density, low self-discharge rate, good rate performance, long cycle life, no memory effect, environmental friendliness and the like, and is widely applied to mobile phones, digital cameras and notebook computers. With the rapid development in the fields of electric automobiles, energy storage systems and the like in recent years, the lithium ion battery has wider requirements, and meanwhile, the performance of the lithium ion battery has higher requirements.
As one of the key inner layer components in the lithium ion battery, the diaphragm has the functions of providing a channel for the transmission of lithium ions in a liquid electrolyte and isolating the anode and the cathode of the battery so as to avoid short circuit caused by direct contact of the two electrodes. In the lithium ion battery, the quality of the diaphragm is closely related to the interface structure, internal resistance and the like of the battery, and further has corresponding influence on the capacity, the cycle performance, the safety performance and the like of the battery.
At present, polyolefin films such as commercial Polyethylene (PE), polypropylene (PP), polypropylene/polyethylene/polypropylene (PP/PE/PP) and the like have poor wettability and thermal stability, and are easy to cause short circuit of batteries and cause a series of safety problems such as thermal runaway and the like. Therefore, the development of a novel lithium ion battery separator with good heat resistance and high ionic conductivity has become a hot spot of current research work.
Disclosure of Invention
In view of the above, the present invention provides a lithium ion battery separator, which uses a polyolefin-based film as a substrate, and prepares an electrostatic spinning film layer on the surface of the polyolefin-based film by an electrostatic spinning process using a spinning solution containing polyaryletherketone and carbon nanotubes, so that the lithium ion battery separator has high mechanical strength, thermal stability, electrolyte wettability and ionic conductivity, so as to solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a lithium ion battery diaphragm, which comprises:
a polyolefin based film;
the electrostatic spinning film layer is arranged on the surface of the polyolefin base film and comprises polyaryletherketone and carbon nano tubes.
Further, the polyolefin base film is a polyolefin microporous film, and the polyolefin microporous film is selected from a polyethylene microporous film or a polypropylene microporous film.
The invention also provides a preparation method of the lithium ion battery diaphragm, which comprises the following steps:
providing a polyolefin-based film:
providing a spinning solution, adding polyaryletherketone powder and carbon nanotubes into an organic solvent, fully stirring, and completely dissolving to obtain the spinning solution;
and cutting and fixing the polyolefin base film, spinning the spinning solution to the surface of the polyolefin base film through an electrostatic spinning process, and drying to obtain the lithium ion battery diaphragm.
Further, the specific steps of providing the spinning solution are as follows: adding polyaryletherketone powder and carbon nanotubes into an organic solvent, and stirring at 40-80 ℃ for 1-3 h to completely dissolve.
Further, the organic solvent is selected from N-methyl pyrrolidone.
Furthermore, in the spinning solution, the mass fraction of the polyaryletherketone is 10-15%, and the mass fraction of the carbon nano tube is 1.0-3.0%.
Further, the electrostatic spinning process is realized by adopting an electrostatic spinning spraying device, and the specific parameters are as follows: the advancing speed is between 0.2mL/h and 0.6mL/h, the spinning voltage is between 15kV and 20kV, and the distance between the receiving plate and the needle head is controlled between 15cm and 20 cm.
Further, the drying specifically comprises the following steps: baking for 4-9 h at 50-100 ℃.
The invention also provides a lithium ion battery, which is assembled by the positive plate, the negative plate, the diaphragm and the electrolyte, wherein the diaphragm is the lithium ion battery diaphragm.
Compared with the prior art, the invention has the following beneficial effects:
the invention takes the polyolefin basal membrane as the diaphragm substrate, and the electrostatic spinning membrane layer containing the polyaryletherketone and the carbon nano tube is spun on the surface of the polyolefin basal membrane through the electrostatic spinning process, the polyaryletherketone and the carbon nano tube in the electrostatic spinning membrane layer generate the synergistic effect, thereby improving the temperature resistance and the ionic conductivity of the lithium ion battery diaphragm,
the preparation process of the lithium ion battery diaphragm is simple, the operation is convenient, the damage to the diaphragm is reduced to the maximum extent, the cost is low, the lithium ion battery diaphragm is suitable for mass production, and the market prospect is wide.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In a first aspect, the present invention provides a lithium ion battery separator comprising:
a polyolefin based film;
the electrostatic spinning film layer is arranged on the surface of the polyolefin base film and comprises polyaryletherketone and carbon nano tubes.
The polyolefin base film is used as the diaphragm substrate, and the good mechanical strength of the lithium ion battery diaphragm can be ensured due to the high mechanical strength of the polyolefin base film. The polyaryletherketone has good electrochemistry and size stability, a molecular structure contains a large number of polar groups such as ether bonds, carbonyl groups and the like, the infiltration and absorption of electrolyte are facilitated, the carbon nano tube can accelerate the transmission of ions and electrons in a system, the ionic conductivity is improved, and a fiber membrane prepared by electrostatic spinning has higher porosity, larger specific surface and excellent electrochemical performance, so that the polyaryletherketone and the carbon nano tube are mixed and then are prepared on the surface of the polyolefin membrane by adopting an electrostatic spinning process, and the obtained lithium ion battery membrane has excellent performance.
It is understood that the surface of the polyolefin base film may be one side or both sides of the polyolefin base film, and is not particularly limited and may be adjusted as needed.
Further, the polyolefin-based film described in the present invention is not particularly limited, and may be selected from polyolefin separators conventionally used in the art, such as polyolefin microporous films, and specific examples of the polyolefin microporous films include, but are not limited to, polyethylene microporous films or polypropylene microporous films.
The invention also provides a preparation method of the lithium ion battery diaphragm, which comprises the following steps:
providing a polyolefin-based film:
providing a spinning solution, adding polyaryletherketone powder and carbon nanotubes into an organic solvent, fully stirring, and completely dissolving to obtain the spinning solution;
and cutting and fixing the polyolefin base film (cutting the polyolefin base film into a proper size according to the requirement), spinning the spinning solution to the surface of the polyolefin base film through an electrostatic spinning process, and drying to obtain the lithium ion battery diaphragm.
The membrane layer prepared by the electrostatic spinning technology has higher porosity, larger specific surface area and excellent electrochemical performance, so the invention adopts the electrostatic spinning technology to prepare the electrostatic spinning membrane layer after the polyaryletherketone and the carbon nano tube are mixed to prepare the spinning solution, and the obtained lithium ion battery diaphragm has excellent performance.
Further, the preparation of the spinning solution is not particularly limited as long as the polyaryletherketone and the carbon nanotubes are completely dissolved in the organic solvent, and preferably, in some specific embodiments of the present invention, the specific steps of providing the spinning solution are as follows: adding polyaryletherketone powder and carbon nanotubes into an organic solvent, and stirring at 40-80 ℃ for 1-3 h to completely dissolve.
Further, the selection of the organic solvent in the spinning solution in the present invention is not particularly limited as long as the organic solvent capable of dissolving the polyaryletherketone and the carbon nanotube can be used in the present invention, and preferably, in some specific embodiments of the present invention, the organic solvent is selected from N-methylpyrrolidone.
Furthermore, the ratio of polyaryletherketone to carbon nanotubes is not particularly limited, and may be adjusted as needed, and in some specific embodiments of the present invention, the mass fraction of polyaryletherketone in the spinning solution is 10 to 15%, and the mass fraction of carbon nanotubes is 1.0 to 3.0%, so that the performance of the obtained lithium ion battery separator is optimal.
Further, the electrostatic spinning process is realized by adopting an electrostatic spinning spraying device, and the specific parameters are as follows: the advancing speed is between 0.2mL/h and 0.6mL/h, the spinning voltage is between 15kV and 20kV, the distance between the receiving plate and the needle head is controlled between 15cm and 20cm, and the thickness of the electrostatic spinning film layer can be controlled by controlling the electrostatic spinning time.
Further, the drying is to remove the residual solvent in the electrospun membrane layer, and preferably, the drying specifically comprises the following steps: baking for 4-9 h at 50-100 ℃.
The invention also provides a lithium ion battery, which is assembled by the positive plate, the negative plate, the diaphragm and the electrolyte, wherein the selection of the positive plate, the negative plate and the electrolyte is not particularly limited, the materials can be conventional in the field, the assembly mode also adopts the conventional battery assembly mode in the field, and the diaphragm adopts the lithium ion battery diaphragm.
The technical scheme of the invention is further clearly and completely illustrated by combining specific examples and comparative examples.
Example 1
Dissolving polyaryletherketone (PPEK) powder and carbon nanotubes in N-methylpyrrolidone (NMP), and stirring at 60 deg.C for 3h to obtain uniform spinning solution; wherein the mass fraction of the PPEK is 14.0 percent, and the mass fraction of the carbon nano tube is 1.0 percent.
Cutting the modified 9-micron polyethylene single-layer diaphragm, and fixing the diaphragm on an electrostatic spinning spraying device for single-side coating. And (3) injecting the spinning solution into a spinning needle cylinder, spinning under the conditions that the spinning voltage is 20kV, the distance between a receiving plate and a syringe needle is 15cm, and the spinning advancing speed is 2.0mL/h, and controlling the thickness of the coated coating to be 3 micrometers.
And (3) putting the spun diaphragm into a vacuum oven, adjusting the temperature to 60 ℃, and drying for 6 hours to obtain the lithium ion battery diaphragm.
Example 2
Dissolving polyaryletherketone (PPEK) powder and carbon nanotubes in N-methylpyrrolidone (NMP) and stirring at 60 ℃ for 3h to form uniform spinning solution; wherein the mass fraction of the PPEK is 13.5 percent, and the mass fraction of the carbon nano tube is 1.5 percent.
Cutting the modified 9-micron polyethylene single-layer diaphragm, and fixing the diaphragm on an electrostatic spinning spraying device for single-side coating. And (3) injecting the spinning solution into a spinning needle cylinder, spinning under the conditions that the spinning voltage is 20kV, the distance between a receiving plate and a syringe needle is 15cm, and the spinning advancing speed is 2.0mL/h, and controlling the thickness of the coated coating to be 3 micrometers.
And (3) putting the spun diaphragm into a vacuum oven, adjusting the temperature to 60 ℃, and drying for 6 hours to obtain the lithium ion battery diaphragm.
Example 3
Dissolving polyaryletherketone (PPEK) powder and carbon nanotubes in N-methylpyrrolidone (NMP) and stirring at 60 ℃ for 3h to form uniform spinning solution; wherein the mass fraction of the PPEK is 13.0 percent, and the mass fraction of the carbon nano tube is 2.0 percent.
Cutting the modified 9-micron polyethylene single-layer diaphragm, and fixing the diaphragm on an electrostatic spinning spraying device for single-side coating. And (3) injecting the spinning solution into a spinning needle cylinder, spinning under the conditions that the spinning voltage is 20kV, the distance between a receiving plate and a syringe needle is 15cm, and the spinning advancing speed is 2.0mL/h, and controlling the thickness of the coated coating to be 3 micrometers.
And (3) putting the spun diaphragm into a vacuum oven, adjusting the temperature to 60 ℃, and drying for 6 hours to obtain the lithium ion battery diaphragm.
Example 4
Dissolving polyaryletherketone (PPEK) powder and carbon nanotubes in N-methylpyrrolidone (NMP) and stirring at 60 ℃ for 3h to form uniform spinning solution; wherein the mass fraction of the PPEK is 12.0 percent, and the mass fraction of the carbon nano tube is 3.0 percent.
Cutting the modified 9-micron polyethylene single-layer diaphragm, and fixing the diaphragm on an electrostatic spinning spraying device for single-side coating. And (3) injecting the spinning solution into a spinning needle cylinder, spinning under the conditions that the spinning voltage is 20kV, the distance between a receiving plate and a syringe needle is 15cm, and the spinning advancing speed is 2.0mL/h, and controlling the thickness of the coated coating to be 3 micrometers.
And (3) putting the spun diaphragm into a vacuum oven, adjusting the temperature to 60 ℃, and drying for 6 hours to obtain the lithium ion battery diaphragm.
Example 5
Dissolving polyaryletherketone (PPEK) powder and carbon nanotubes in N-methylpyrrolidone (NMP) and stirring at 80 ℃ for 1h to form uniform spinning solution; wherein the mass fraction of the PPEK is 15 percent, and the mass fraction of the carbon nano tube is 2.0 percent.
Cutting the modified 9-micron polypropylene single-layer diaphragm, and fixing the diaphragm on an electrostatic spinning spraying device for single-side coating. And (3) injecting the spinning solution into a spinning needle cylinder, spinning under the conditions that the spinning voltage is 18kV, the distance between a receiving plate and a syringe needle is 20cm, and the spinning advancing speed is 1.0mL/h, and controlling the thickness of the coated coating to be 3 micrometers.
And (3) putting the spun diaphragm into a vacuum oven, adjusting the temperature to 100 ℃, and drying for 4 hours to obtain the lithium ion battery diaphragm.
Example 6
Dissolving polyaryletherketone (PPEK) powder and carbon nano tubes in N-methyl pyrrolidone (NMP) and stirring at 40 ℃ for 2h to form uniform spinning solution; wherein the mass fraction of the PPEK is 10 percent, and the mass fraction of the carbon nano tube is 1.0 percent.
Cutting the modified 9-micron polypropylene single-layer diaphragm, and fixing the diaphragm on an electrostatic spinning spraying device for single-side coating. And (3) injecting the spinning solution into a spinning needle cylinder, spinning under the conditions that the spinning voltage is 15kV, the distance between a receiving plate and a syringe needle is 18cm, and the spinning advancing speed is 0.2mL/h, and controlling the thickness of the coated coating to be 3 micrometers.
And (3) putting the spun diaphragm into a vacuum oven, adjusting the temperature to 50 ℃, and drying for 9 hours to obtain the lithium ion battery diaphragm.
Comparative example 1
A lithium ion battery separator was produced in the same manner as in example 1, except that "the mass fraction of PPEK was 14.0%, the mass fraction of carbon nanotubes was 1.0%" in example 1 was replaced with "the mass fraction of PPEK was 15.0%".
Comparative example 2
A lithium ion battery separator was produced in the same manner as in example 1, except that "the mass fraction of PPEK was 14.0%, the mass fraction of carbon nanotubes was 1.0%" in example 1 was replaced with "the mass fraction of carbon nanotubes was 15.0%".
Comparative example 3
Compared with the embodiment 1, the spinning solution is directly coated on the surface of the base film by adopting a spraying process and then dried, and the other steps are the same as the embodiment 1, so that the lithium ion battery diaphragm is prepared.
Test example
The lithium ion battery separators in the above examples and comparative examples were measured for the basic performance parameters of tensile strength, porosity, liquid absorption rate, ionic conductivity and heat shrinkage, and the test method was as follows:
1. testing of tensile Strength: a sample with the width of 15mm +/-0.1 mm is adopted, the initial distance of the clamp is set to be 65mm +/-5 mm, and the test speed is 100mm/min +/-10 mm/min. The tensile breaking strength calculation formula is as follows: δ is F/(L × d), where δ is the tensile strength, F is the sample tensile load, L is the specimen width, and d is the specimen width.
2. Testing of porosity: and (3) soaking the membrane in the n-butyl alcohol solution for 4 hours, sucking the n-butyl alcohol on the surface of the membrane by using filter paper before weighing, and weighing the mass of the membrane again. The porosity P of the separator is Δ m/(ρ × V) × 100%. Wherein, Delta m is the mass difference before and after the membrane is soaked, and rho is the density of n-butanol and is equal to 0.81g/cm3And V is the volume of the diaphragm.
3. Testing of ionic conductivity: cutting a diaphragm matched with the resistance testing mold, putting the diaphragm into electrolyte, sealing and soaking for 2h, calculating the conductivity by using a formula sigma (d) ((R) S) after obtaining the resistance value, wherein sigma is the ionic conductivity of the diaphragm, R is the resistance value of the diaphragm, d is the thickness of the diaphragm, and S is the area of the diaphragm cut in the test.
4. Test method of thermal shrinkage: 5 pieces of a 100mm X100 mm sample were cut out, treated in a vacuum oven at a temperature of 120 ℃ for 1.0 hour, and then measured for longitudinal dimension. Heat shrinkage ratio: Δ L ═ L (L)0-L)/L0X 100%, L is the longitudinal length after heating, L0Is the longitudinal length before heating, in mm.
See table 1 for test results.
TABLE 1 lithium ion battery separator Performance test results
Figure BDA0002848931510000081
The test results in table 1 show that the modified separator has high ionic conductivity, good heat resistance, and good mechanical strength, and is a lithium ion battery separator with excellent performance.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A lithium ion battery separator, comprising:
a polyolefin based film;
the electrostatic spinning film layer is arranged on the surface of the polyolefin base film and comprises polyaryletherketone and carbon nano tubes.
2. The lithium ion battery separator according to claim 1, wherein the polyolefin-based film is a polyolefin microporous film selected from the group consisting of polyethylene microporous films and polypropylene microporous films.
3. A method for preparing the lithium ion battery separator according to claim 1 or 2, comprising the steps of:
providing a polyolefin-based film:
providing a spinning solution, adding polyaryletherketone powder and carbon nanotubes into an organic solvent, fully stirring, and completely dissolving to obtain the spinning solution;
and cutting and fixing the polyolefin base film, spinning the spinning solution to the surface of the polyolefin base film through an electrostatic spinning process, and drying to obtain the lithium ion battery diaphragm.
4. The preparation method of the lithium ion battery separator according to claim 3, wherein the specific steps of providing the spinning solution are as follows: adding polyaryletherketone powder and carbon nanotubes into an organic solvent, and stirring at 40-80 ℃ for 1-3 h to completely dissolve.
5. The method of claim 3, wherein the organic solvent is selected from the group consisting of N-methylpyrrolidone.
6. The preparation method of the lithium ion battery separator according to claim 3, wherein the spinning solution contains the polyaryletherketone in an amount of 10 to 15% by mass, and the carbon nanotubes in an amount of 1.0 to 3.0% by mass.
7. The preparation method of the lithium ion battery separator according to claim 3, wherein the electrostatic spinning process is realized by using an electrostatic spinning spraying device, and the specific parameters are as follows: the advancing speed is between 0.2mL/h and 0.6mL/h, the spinning voltage is between 15kV and 20kV, and the distance between the receiving plate and the needle head is controlled between 15cm and 20 cm.
8. The preparation method of the lithium ion battery separator according to claim 3, wherein the drying comprises the following specific steps: baking for 4-9 h at 50-100 ℃.
9. A lithium ion battery, which is assembled by a positive plate, a negative plate, a diaphragm and electrolyte, and is characterized in that the diaphragm adopts the lithium ion battery diaphragm of claim 1 or 2.
CN202011521061.4A 2020-12-21 2020-12-21 Lithium ion battery diaphragm and preparation method thereof and lithium ion battery Pending CN112635907A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115295958A (en) * 2022-08-30 2022-11-04 中国科学院长春应用化学研究所 Polyaryletherketone diaphragm, and preparation method and application thereof

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Publication number Priority date Publication date Assignee Title
CN107799696A (en) * 2016-08-29 2018-03-13 比亚迪股份有限公司 A kind of lithium ion battery separator and preparation method thereof and lithium ion battery
CN107799703A (en) * 2016-08-29 2018-03-13 比亚迪股份有限公司 A kind of composite membrane of polymer and preparation method thereof and the lithium ion battery for including it
CN109980234A (en) * 2019-03-29 2019-07-05 宁德新能源科技有限公司 Composite current collector and composite pole piece and electrochemical appliance comprising it

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107799696A (en) * 2016-08-29 2018-03-13 比亚迪股份有限公司 A kind of lithium ion battery separator and preparation method thereof and lithium ion battery
CN107799703A (en) * 2016-08-29 2018-03-13 比亚迪股份有限公司 A kind of composite membrane of polymer and preparation method thereof and the lithium ion battery for including it
CN109980234A (en) * 2019-03-29 2019-07-05 宁德新能源科技有限公司 Composite current collector and composite pole piece and electrochemical appliance comprising it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115295958A (en) * 2022-08-30 2022-11-04 中国科学院长春应用化学研究所 Polyaryletherketone diaphragm, and preparation method and application thereof

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Application publication date: 20210409