CN116470232A - Production method of aramid fiber diaphragm of lithium ion battery - Google Patents

Production method of aramid fiber diaphragm of lithium ion battery Download PDF

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Publication number
CN116470232A
CN116470232A CN202310636331.3A CN202310636331A CN116470232A CN 116470232 A CN116470232 A CN 116470232A CN 202310636331 A CN202310636331 A CN 202310636331A CN 116470232 A CN116470232 A CN 116470232A
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Prior art keywords
lithium ion
aramid
ion battery
diaphragm
solution
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CN202310636331.3A
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Inventor
张德顺
胡伟
吴磊
徐卫兵
周正发
任凤梅
张强
王若愚
李坤
刘志强
刘梦茹
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Jieshou Tianhong New Material Co ltd
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Jieshou Tianhong New Material Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/423—Polyamide resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H01M50/491—Porosity
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Cell Separators (AREA)

Abstract

The invention discloses a method for producing aramid fiber diaphragm of lithium ion battery, which belongs to the technical field of lithium ion battery diaphragm, wherein one side or two sides of the pretreated aramid fiber paper diaphragm are uniformly coated with precipitation casting solution, the solution is soaked in non-solvent water to rapidly precipitate to produce a coating film with high porosity, salt solution is added into the casting solution to serve as a pore forming agent, the pretreated aramid fiber paper diaphragm is pretreated to improve the bonding strength of the aramid fiber paper diaphragm and the coating film, and simultaneously, the photoinitiated polymerized dimethylaminoethyl methacrylate and acrylamide are utilized to improve the surface wettability of the diaphragm, so that the internal resistance of the lithium ion battery is increased, and the cycle performance and charge-discharge efficiency of the battery are improved. The electrolyte has high heat resistance, flame retardance, porosity and high temperature resistance, is excellent in wettability with the electrolyte, has high oxidation resistance, can improve the cycle life and charging speed of the battery, and improves the energy density and safety of the battery.

Description

Production method of aramid fiber diaphragm of lithium ion battery
Technical Field
The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a production method of an aramid fiber diaphragm of a lithium ion battery.
Background
The polymer coating modified diaphragm has higher liquid absorption performance and heat resistance, and can improve the high-rate cycle performance of the diaphragm. The polymer/inorganic (ceramic) composite diaphragm is prepared by dispersing nano inorganic particles (Al 2O3, siO2, caCO3 and TiO 2) in a polymer to prepare slurry, and then coating the slurry on the surface of a polyolefin diaphragm. The diaphragm can improve the heat shrinkage performance of the diaphragm at high temperature, can also improve the wettability of electrolyte to the diaphragm, and improves the safety performance and the cycle performance of the battery. The non-woven fabric composite membrane is a non-woven fabric base membrane with a fiber network structure prepared by using polymers such as fluorine-containing polymers [ polyvinylidene fluoride (PVDF), polyimide (PI) and Polyester (PET), and the like, and then is coated with substances such as polymers (pore forming is needed), nano fibers, nano inorganic particles and the like. Compared with polyolefin microporous membrane, the non-woven fabric coated membrane has higher porosity, excellent liquid absorption performance and lower preparation cost, and is beneficial to industrial production. The nano fiber non-woven fabric made of high temperature resistant materials is selected, so that the dimensional heat stability of the diaphragm can be improved, for example, aramid fiber has better heat resistance (the heat resistance temperature is more than 200 ℃), chemical stability and mechanical property are difficult to dissolve due to the fact that PPTA is difficult to prepare a PPTA porous membrane by utilizing phase separation, the technical difficulty is high, and stable industrial production is difficult to realize; although the preparation of the diaphragm by the non-woven fabric method is feasible in principle, the existing para-aramid fiber has the diameter of about 10wei mu m, and the diaphragm prepared by directly utilizing para-aramid short fibers or pulp has the problems of low diaphragm strength, uneven structure and the like; compounding a PPTA membrane on the surface of a polyolefin membrane by using a coating method is a compromise method, but the problem of adhesion between the PPTA membrane and the polyolefin membrane is also required to be solved; the preparation of lithium ion battery separator using PPTA nanofibers is a new method that has emerged in recent years, but the current technology is not mature and further development and improvement are needed. Chemical cleavage methods have been developed by Kotov et al to prepare aramid nanofibers. The method comprises the steps of deprotonating an amide bond part on a para-aramid molecular chain in dimethyl sulfoxide through strong alkali potassium hydroxide to enable PPTA molecular chain to have negative charge, and then successfully preparing uniform dispersion liquid of PPTA nanofibers by utilizing electrostatic repulsion between anionic PPTA long chains. The anionized aramid nanofiber is used as a building base material, and is compounded with polydiallyl dimethyl ammonium chloride and polyacrylic acid to prepare the transparent high-temperature-resistant high-strength aramid nanofiber composite film material. The diaphragm materials have excellent mechanical properties and strong lithium dendrite penetration resistance, but have low battery capacity and poor charge and discharge performance due to low porosity. Currently, commercial lithium ion battery separators are mainly polyolefin microporous films, including Polyethylene (PE) films, polypropylene (PP) films, multi-layer films (PP/PE films, PP/PE/PP films) compounded by various materials, and the like. Polyolefin separator is low in price, has excellent mechanical properties and insulating properties, and has disadvantages: obvious shrinkage at high temperature, poor electrolyte wettability, low porosity, and the like. These disadvantages affect the safety and electrochemical performance of the battery. To make up for the deficiency of polyolefin separators, various types of composite separators have been developed. Those skilled in the art are urgent to develop a method for producing an aramid separator for a lithium ion battery to meet the existing application market and performance requirements.
Disclosure of Invention
In view of the above, the invention provides a method for producing an aramid separator of a lithium ion battery.
The production method of the aramid fiber diaphragm of the lithium ion battery comprises the steps of obtaining an aramid fiber paper film by high pulping and wet papermaking of conventional aramid fiber, and further comprises the following steps:
firstly, performing ultraviolet halogen lamp irradiation treatment on an aramid paper film, immersing the aramid paper film in dopamine impregnating solution for impregnation, washing the aramid paper film with water, and drying the aramid paper film in a 60 ℃ oven for 3 hours to obtain a pretreated aramid paper film; secondly, dissolving the poly-p-phenylene terephthalamide and a salt solution according to a certain weight ratio in an organic solvent, mechanically stirring for 2-3 hours at room temperature to form a precipitation casting solution, standing for 5-10 min after vacuum defoaming of the precipitation casting solution, uniformly coating the precipitation casting solution on one side or two sides of a pretreated aramid paper film, immersing in a water tank, fully removing the salt solution, and drying to obtain a coating film; and a third step of: immersing the dried coating film in an ethanol mixed solution containing 0.55-0.9% of dimethylaminoethyl methacrylate, 0.45-0.6% of acrylamide and 0.005-0.01% of diphenyl ketone by mass percent, wherein the immersion temperature is 40-50 ℃, the bath ratio is 1:10, the immersion time is 10-15 min, initiating the immersed coating film by using illumination, and then washing and drying after the irradiation to obtain the aramid diaphragm of the lithium ion battery.
Further, the uniform coating mode of the second step is any one of micro gravure roll coating, doctor blade coating and narrow slit extrusion coating.
Further, the illumination initiation power of the third step is 18W/cm, the illumination intensity is 600mW/cm < 2 >, the illumination wavelength is 200-450 nm, the illumination distance is 100-150 mm, and the illumination time is 1-1.5 min.
Furthermore, the dopamine impregnation liquid is Tris-HCl buffer solution with pH value of 8.5, and dopamine hydrochloride with different mass is added to prepare the dopamine impregnation liquid with mass concentration of 1.5-1.6 g/L.
Further, the weight ratio of the paraphenylene terephthalamide, the organic solvent and the salt solution in the second step is 0.1-0.14:1:0.3-0.4.
Further, the salt solution is a calcium chloride aqueous solution with the concentration of 65-70 wt%, and the organic solvent is one of N-methylpyrrolidone or N, N-dimethylacetamide.
Further, the dipping temperature in the first step is 40-50 ℃, the bath ratio is 1:10, and the dipping time is 10-15 min.
Further, the ultraviolet irradiation intensity of the first step is 925 mu W/cm 2 The irradiation distance is 100-150 mm, the wavelength is 250-750 nm, and the irradiation time is 20-25 min.
The invention has the beneficial effects that:
according to the invention, the precipitation casting solution is uniformly coated on one side or two sides of the pretreated aramid paper film, in the phase inversion process, the poly-p-phenylene terephthamide phase is used as a film matrix, polymer lean phase causes generation of film holes, such as N-methylpyrrolidone and dimethylacetamide, the film is soaked in non-solvent water to rapidly precipitate to generate a coating film with high porosity, a salt solution is added into the casting solution to serve as a pore forming agent, the pretreated aramid paper film is pretreated, so that the bonding strength of the aramid paper film and the coating film is improved, and the photoinitiated polymerized dimethylaminoethyl methacrylate and acrylamide are utilized to improve the surface wettability of the diaphragm, so that the internal resistance of the lithium ion battery is increased, and the cycle performance and the charge-discharge efficiency of the battery are improved. The electrolyte has high heat resistance, flame retardance, porosity and high temperature resistance, is excellent in wettability with the electrolyte, has high oxidation resistance, can improve the cycle life and charging speed of the battery, and improves the energy density and safety of the battery.
Detailed Description
The invention may be better understood from the following examples, which are set forth to illustrate, but are not to be construed to limit the invention to the details of the claims, as will be readily apparent to those skilled in the art.
Example 1
Raw material preparation: raw material preparation: polyaromatic P300P-phenylene terephthalamide, dimethylaminoethyl methacrylate, suzhou co-creation chemistry;
the first step, after the aramid paper film is irradiated by an ultraviolet halogen lamp according to the weight parts, the ultraviolet irradiation intensity is 925 mu W/cm 2 The method comprises the steps of (1) immersing the dopamine impregnated solution into the dopamine impregnated solution for 20min at the irradiation distance of 100mm and the wavelength range of 250-750 nm, wherein the dipping temperature is 40 ℃, the bath ratio is 1:10, the dipping time is 10min, the pH value is 8.5, adding dopamine hydrochloride with different masses, preparing the dopamine impregnated solution with the mass concentration of 1.5g/L, washing the dopamine impregnated solution with water, then drying the dopamine impregnated solution in a 60 ℃ oven for 3h to obtain a pretreated aramid paper film, and carrying out high pulping and wet papermaking on the aramid fiber to obtain the aramid paper film with the thickness of 30 mu m and the porosity of 50%; secondly, dissolving poly-p-phenylene terephthalamide, an organic solvent and a salt solution in an organic solvent for 2 hours at room temperature to form a precipitation casting solution, carrying out vacuum defoaming on the precipitation casting solution, standing for 10 minutes, uniformly coating one side or two sides of a pretreated aramid paper film with the precipitation casting solution, immersing the pretreated aramid paper film in a water tank, fully removing the salt solution, and drying to obtain a coating film, wherein the salt solution is 65wt% of calcium chloride aqueous solution; and a third step of: immersing the dried coating film in an ethanol mixed solution containing 0.55% of dimethylaminoethyl methacrylate, 0.45% of acrylamide and 0.01% of benzophenone serving as a photoinitiator in mass percent at a temperature of 40 ℃ in a bath ratio of 1:10 for 10min, and initiating the immersed coating film by using light with an initiating power of 18W/cm and an initiating power of 600mW/cm 2 And the illumination wavelength range is 200-450 nm, the illumination distance is 100mm, the illumination time is 1min, and the aramid fiber diaphragm of the lithium ion battery is obtained after the illumination and the washing and the drying are carried out.
The product performance: the thickness is 40 μm, the porosity is 71%, the liquid absorption is 126%, the longitudinal tensile strength is 95MPa, the transverse tensile strength is 85.4MPa, the puncture strength is 450g/mil, the longitudinal thermal shrinkage is 1.5%, and the transverse thermal shrinkage is 1.5%.
Example 2
Raw material preparation: silicon cereal SP-2910 paraphenylene terephthalamide, dimethylaminoethyl methacrylate Jiangsu Fu vast technology;
the first step, after the aramid paper film is irradiated by an ultraviolet halogen lamp according to the weight parts, the ultraviolet irradiation intensity is 925 mu W/cm 2 The method comprises the steps of (1) immersing the raw materials in dopamine impregnating solution for 20min at the irradiation distance of 150mm and the wavelength range of 250-750 nm, wherein the impregnating solution is immersed in Tris-HCl buffer solution with the immersion temperature of 50 ℃, the bath ratio of 1:10 and the immersion time of 15min and the pH value of 8.5, adding dopamine hydrochloride with different masses, preparing the obtained dopamine impregnating solution with the mass concentration of 1.6g/L, washing the dopamine impregnating solution with water, and then drying the dopamine impregnating solution in an oven at 60 ℃ for 3h to obtain the pretreated aramid paper film; secondly, dissolving poly-p-phenylene terephthalamide, an organic solvent and a salt solution in a weight ratio of 0.14:1:0.4, wherein the salt solution is a calcium chloride aqueous solution with a concentration of 70wt%, the organic solvent is N-methyl pyrrolidone, the poly-p-phenylene terephthalamide and the salt solution are dissolved in the organic solvent, mechanically stirring for 3 hours at room temperature to form a precipitation casting solution, standing for 10min after vacuum defoaming of the precipitation casting solution, uniformly coating the precipitation casting solution on one side or two sides of a pretreated aramid paper film, immersing in a water tank, fully removing the salt solution, and drying to obtain a coating film; and a third step of: immersing the dried coating film in an ethanol mixed solution containing 0.9% of dimethylaminoethyl methacrylate, 0.6% of acrylamide and 0.01% of benzophenone serving as a photoinitiator in mass percent at a temperature of 50 ℃ in a bath ratio of 1:10 for 15min, and initiating the immersed coating film by using light with an initiating power of 18W/cm and an initiating power of 600mW/cm 2 And the illumination wavelength range is 250-450 nm, the illumination distance is 150mm, the illumination time is 1.5min, and the aramid diaphragm of the lithium ion battery is obtained after the illumination and the water washing and the drying are carried out.
The product performance: the thickness is 40.5 mu m, the porosity is 70.6%, the liquid absorption rate is 154%, the longitudinal tensile strength is more than 92.6MPa, the transverse tensile strength is more than 85.8MPa, the puncture strength is 450g/mil, the longitudinal heat shrinkage is 1.5%, and the transverse heat shrinkage is 1.5%.
Note that: the condition was adjusted according to the standard environmental normal deviation of GB/T2918-1998 for not less than 2 hours, and the test was conducted under this condition. The appearance detection of the diaphragm of the appearance detection instrument advanced surface visual detection system detection method adopts a light transmission method. And carrying out statistics and differentiation on folds, impurities, flaws, spots and holes of the diaphragm through the diaphragm on-line flaw detector. The detection method for the dimension thickness of the precise thickness gauge of the detection instrument with the precision of 1 μm is carried out according to the GB/T6672-2001 rule. The density and porosity of the membrane were calculated by means of weighing. A separator with a width of one meter is divided into 9 areas transversely after trimming, and the sampling area of each area is a rectangle with the size of 8cm multiplied by 20cm, namely the area S is 0.016 square meter. The mass of the sample is weighed on an analytical balance respectively, 4 bits are accurate to decimal places, and the mass of the sample is recorded as m. The thickness of the membrane is measured by a precise thickness gauge, and the average thickness value of each membrane is delta. And (3) calculating: density ρ=m/(s×δ). Porosity n=1- (m/1.4×s×δ). Aperture detection instrument full-automatic gas permeability instrument detection method is carried out according to the specification of SJT 10171.10-1991. The aperture test adopts a gas permeability method test (full-automatic gas permeability meter), the test area of a sample is 3.14cm, the wetting liquid is used as a standard, and the air permeability of the sample wetting the diaphragm along with the change of the gas pressure changes, so that the aperture range of the diaphragm is calculated. Full-automatic gas permeability measuring method of air permeability measuring instrument is carried out according to the specification of SJ/T10171.9-1991. The air permeability test adopts a gas permeability method test (full-automatic gas permeability meter), the test area of a sample is 3.14cm, the air permeability is changed under different pressures, the air permeability under a specified pressure is selected, and the air permeability time is calculated. The detection method of the electronic universal tester of the tensile strength detection instrument is carried out according to the specification of GB/T1040.3-2006. Samples (TD, MD with a width of 15mm and a length of 50 mm) were tested for maximum forces in the TD, MD at a draw rate of 10 mm/min. And testing for at least 5 times in each direction, and taking the average value of the test results to calculate the tensile strength in the TD and MD directions respectively. The tensile strength calculation method comprises the following steps: t=p/(b×d) t is tensile strength (MPa), p is maximum force (N), b is sample width (mm), and d is sample thickness (mm). The method for detecting the needling strength by the electronic universal tester is carried out according to the specification of ASTMD 4833-00. The needling rate was set at 5mm/min. The maximum force at which the membrane was pierced was calculated experimentally and averaged. The liquid absorption rate detection instrument vacuum glove box and analytical balance detection method are carried out according to the specification of SJ/T10171.7-1991 and SJ/T10171.7-1991. A diaphragm sample was taken (all operations must be performed in a glove box, the dew point of which required-40 ℃) and weighed m0 with an analytical balance, the diaphragm was immersed in working electrolyte, held for 90min, the diaphragm was removed and the surface electrolyte was blotted with filter paper and weighed m1 with an analytical balance. The liquid absorption rate is obtained through calculation, and the calculation formula is as follows: the liquid absorption= (m 1-m 0)/m 0 100% thermal shrinkage rate measuring instrument blast type constant temperature oven, and ruler (precision 0.02 mm) measuring method was performed with reference to the specification of GB/T12027-2004. The method comprises the steps of selecting a diaphragm sample (TD and MD are respectively required to be sampled and tested), measuring the length L0 before heating by using a ruler, setting the temperature of an oven to be 250 ℃ and the residence time to be 120min, measuring the length L1 after heating by using the ruler, and calculating the thermal shrinkage rate. The calculation formula is as follows: s= (L0-L1)/L0 x 100 thermal stability detection instrument thermogravimetric analyzer detection method is performed with reference to the standard of GB/T30711-2014. Thermal stability test a thermal weight loss method (thermogravimetric analyzer) was used, a certain amount of 8mg of the membrane sample was weighed and heated to 800 c at a heating rate of 10 c/min. The temperature at which the mass loss was 5% was taken.

Claims (8)

1. The production method of the aramid fiber diaphragm of the lithium ion battery comprises the steps of obtaining an aramid fiber paper film by high pulping and wet papermaking of conventional aramid fiber, and is characterized by comprising the following steps of:
firstly, performing ultraviolet halogen lamp irradiation treatment on an aramid paper film, immersing the aramid paper film in dopamine impregnating solution for impregnation, washing the aramid paper film with water, and drying the aramid paper film in a 60 ℃ oven for 3 hours to obtain a pretreated aramid paper film; secondly, dissolving the poly-p-phenylene terephthalamide and a salt solution according to a certain weight ratio in an organic solvent, mechanically stirring for 2-3 hours at room temperature to form a precipitation casting solution, standing for 5-10 min after vacuum defoaming of the precipitation casting solution, uniformly coating the precipitation casting solution on one side or two sides of a pretreated aramid paper film, immersing in a water tank, fully removing the salt solution, and drying to obtain a coating film; and a third step of: immersing the dried coating film in an ethanol mixed solution containing 0.55-0.9% of dimethylaminoethyl methacrylate, 0.45-0.6% of acrylamide and 0.005-0.01% of diphenyl ketone by mass percent, wherein the immersion temperature is 40-50 ℃, the bath ratio is 1:10, the immersion time is 10-15 min, initiating the immersed coating film by using illumination, and then washing and drying after the irradiation to obtain the aramid diaphragm of the lithium ion battery.
2. The method for producing aramid separator for lithium ion batteries according to claim 1, wherein the uniform coating mode of the second step is any one of micro gravure roll coating, doctor blade coating and narrow slit extrusion coating.
3. The aramid separator of lithium ion battery according to claim 1, wherein the illumination initiation power of the third step is 18W/cm and the illumination intensity is 600mW/cm 2 The illumination distance is 100-150 mm, and the illumination time is 1-1.5 min.
4. The method for producing the aramid fiber diaphragm of the lithium ion battery according to claim 1, wherein the dopamine impregnation liquid in the first step is Tris-HCl buffer solution with the pH value of 8.5, and dopamine hydrochloride with different masses is added to prepare the dopamine impregnation liquid with the mass concentration of 1.5-1.6 g/L.
5. The method for producing the aramid separator for the lithium ion battery, according to claim 1, wherein the weight ratio of the poly-paraphenylene terephthalamide, the organic solvent and the salt solution in the second step is 0.1-0.14:1:0.3-0.4.
6. The method for producing the aramid separator of the lithium ion battery, according to claim 1, is characterized in that the salt solution is a calcium chloride aqueous solution with the concentration of 65-70 wt%, and the organic solvent is one of N-methyl pyrrolidone or N, N-dimethylacetamide.
7. The method for producing the aramid fiber diaphragm of the lithium ion battery according to claim 1, wherein the dipping temperature in the first step is 40-50 ℃, the bath ratio is 1:10, and the dipping time is 10-15 min.
8. The method for producing aramid separator for lithium ion battery according to claim 1, wherein the ultraviolet irradiation intensity of the first step is 925 μw/cm 2 The irradiation distance is 100-150 mm, and the irradiation time is 20-25 min.
CN202310636331.3A 2023-06-01 2023-06-01 Production method of aramid fiber diaphragm of lithium ion battery Pending CN116470232A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117239220A (en) * 2023-11-14 2023-12-15 珠海冠宇电池股份有限公司 Battery core

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117239220A (en) * 2023-11-14 2023-12-15 珠海冠宇电池股份有限公司 Battery core
CN117239220B (en) * 2023-11-14 2024-02-23 珠海冠宇电池股份有限公司 Battery core

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