CN110256717A - A kind of porous polyimide film and its preparation method and application - Google Patents
A kind of porous polyimide film and its preparation method and application Download PDFInfo
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
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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
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- 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
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- C08J2201/00—Foams characterised by the foaming process
- C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
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- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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Abstract
The invention discloses a kind of porous polyimide films and its preparation method and application, dibasic anhydride, diamine are subjected to low temperature poly condensation in polar solvent, generate presoma polyamic acid PAA solution, stirring in presoma polyamic acid PAA solution is added in additive and forms casting solution, casting solution is scratched on a glass through deaeration and is immersed in coagulating bath, simultaneously naturally dry is then taken out, handles to obtain porous polyimide film through hot imidization or chemical imidization.The present invention is not necessarily to high temperature and pressure, and the requirement to membrane equipment is simple, is advantageously implemented heavy industrialization application.In addition, film thickness is adjustable, porosity is high up to 40% or more, imbibition rate, with lithium-ion electrolyte wetability is good, high temperature resistance is excellent, be expected to become one of next generation's lithium ion battery separator material.
Description
Technical field
The invention belongs to Kapton preparation technical fields, and in particular to a kind of porous polyimide film and its system
Preparation Method and application.
Background technique
Porous polymer film is in catalyst, seperation film, battery diaphragm, in the synthesis of biotechnology or fine nanostructur
There are potential applications, cause the extensive concern of people.In terms of power battery, diaphragm is indispensable important composition portion
Point, this requires it with preferable ionic conductivity, good electrolyte wetability, higher mechanical strength and heat and electricity
Chemical stability.Furthermore guaranteeing that mechanical strength premise lower diaphragm plate good enough should be as thin as possible, porosity is answered as big as possible.System
The matrix of standby polymer porous film is at present based on polyethylene, polypropylene and additive.But polyethylene, polypropylene-base perforated membrane are molten
Only 140~160 DEG C of point, thermal stability is poor.And polyethylene belongs to non-polar polymer, it is poor with electrolyte wellability.
Polyimides is a kind of novel extraordinary insulating materials, low-k, high tensile, good electrolyte
The excellent properties such as wetability, excellent chemical stability comply fully with requirement of the lithium ion battery for diaphragm material, make its at
For one of the lithium ion battery separator material of most application potential, meanwhile, it is poly- that good high temperature resistance can make up for it tradition
The disadvantage of alkene diaphragm thermal stability difference, it is hidden in the safety that the leakage and reduction battery for inhibiting electrolyte generate in use
Suffer from etc. has important practical significance.
Existing preparation method is that pore former is dispersed in polyamic acid solution, is obtained through deaeration, plastic film mulch, imidization
Polyamic acid/pore-forming substance composite membrane, laminated film is placed in etching liquid, washed and to be dried to obtain polyimide foraminous thin
Film.Etching liquid is hydrofluoric acid, the concentrated sulfuric acid or concentrated hydrochloric acid.Or make template using silica colloidal spheres, it will be evenly dispersed
PAA/SiO2Colloidal solution is dried to obtain the PAA/SiO of ordered structure2Laminated film is etched after imidization by hydrofluoric acid solution
Remove SiO2Colloidal spheres, washing, vacuum drying obtain structurally ordered polyimide porous film.There are also one is first prepare electricity
Deposition template, is then dissolved in organic solution for soluble polyimide, makes strand is positively charged to be made by molecular modification
Electro-deposition solution, electro-deposition Kapton in template after treatment, then etches template, introduces gas in the film
Hole, finally heated solidification obtain 3-D ordered multiporous Kapton.Above method use etching agent be generally hydrofluoric acid,
The strong acid such as the concentrated sulfuric acid or concentrated hydrochloric acid and etching agent are difficult to penetrate into material internal, along with pore former is generally pore-free material, therefore
In the presence of pollution environment, the etching processing time is long and pore former removal efficiency is low, technical costs is higher, and technology difficulty is big etc. asks
Topic.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of porous polyamides
Imines film and its preparation method and application will be immersed in coagulating bath after the compound polyimide acid solution film forming containing additive
In, hole is generated by phase separation method principle, most handles to obtain polyimides through hot imidization or chemical imidization afterwards
Porous membrane, the porous membrane thickness of preparation is adjustable, porosity is high up to 40% or more, imbibition rate, soaks with lithium-ion electrolyte
Property it is good, this method be not necessarily to high temperature and pressure, the requirement to membrane equipment is simple, is advantageously implemented heavy industrialization application.
The invention adopts the following technical scheme:
Dibasic anhydride, diamine are carried out low-temperature polycondensation by a kind of porous polyimide film preparation method in polar solvent
Reaction generates presoma polyamic acid PAA solution, and stirring in presoma polyamic acid PAA solution is added in additive and forms casting
Film liquid, casting solution are scratched on a glass through deaeration and are immersed in coagulating bath, simultaneously naturally dry are then taken out, through hot imidization
Or chemical imidization handles to obtain porous polyimide film.
Specifically, the molar ratio of dibasic anhydride and diamine is 1:1.
Further, dibasic anhydride is diphenyl sulphone (DPS) tetracid dianhydride, equal benzene tertacarbonic acid's dianhydride, biphenyltetracarboxylic dianhydride, benzophenone four
One of acid dianhydride, hexichol hexafluoro isopropyl tetracid dianhydride, diphenyl sulfide tetracid dianhydride are a variety of；Diamine is isophthalic two
Amine, p-phenylenediamine, 4,4 '-diaminodiphenyl ethers, 4,3 '-diaminodiphenyl ethers, 3,3 '-hexichol maple diamines, 4,4 '-hexichol maples two
One of amine is a variety of.
Specifically, the gross mass of dibasic anhydride and diamine is the 10%~20% of casting solution quality.
Specifically, additive accounts for the 5%~30% of casting solution quality, mixing time is more than or equal to 2h.
Further, additive be glycerol, the triblock copolymer of polyethylene oxide and polypropylene oxide, polyethylene glycol,
One of dibutyl phthalate is a variety of.
Specifically, coagulating bath is one of methanol, dehydrated alcohol, ethylene glycol, glycerine, glycerol or a variety of.
Specifically, the time that the blade coating of casting solution with a thickness of 100~300 μm, immerses coagulating bath is 15~50min.
Specifically, porous polyimide film with a thickness of 6~40 μm, aperture is 0.5~3 μm, and porosity is more than or equal to
40%.
Another technical solution of the invention is application of the porous polyimide film in battery diaphragm material.
Compared with prior art, the present invention at least has the advantages that
A kind of porous polyimide film preparation method of the present invention, dibasic anhydride, diamine is carried out in polar solvent low
Warm polycondensation reaction generates presoma polyamic acid PAA solution, and additive is added in presoma polyamic acid PAA solution and is stirred
Casting solution is formed, casting solution is scratched on a glass through deaeration and is immersed in coagulating bath, simultaneously naturally dry is then taken out, through heat
Imidization or chemical imidization handle to obtain porous polyimide film, can be by the type of diluent in regulation system, poly-
Object concentration, coagulating bath time are closed, realizes the diversity and controllability of structure；Required control parameter is few in film forming procedure, therefore makes
Standby process is reproducible, and the control accuracy of microcellular structure is high；The material of preparation porosity with higher, while keeping structure
Complete and intensity；Without high temperature and pressure, requirement to membrane equipment is simple, at low cost, raw material is easy to get, is environmentally friendly, has
Conducive to realization heavy industrialization application.
Further, the content of additive is 5%~30%, with guarantee the porosity of prepared film can reach lithium from
Within the requirement of sub- battery diaphragm, additive is added formation casting solution in presoma polyamic acid PAA solution and usually requires to stir
2h or more is to guarantee that additive is evenly dispersed in polyamic acid PAA solution.
Further, additive generates more holes for assisting.
Further, coagulating bath is one of methanol, dehydrated alcohol, ethylene glycol, glycerine, glycerol or a variety of.Solidification
Bath be in order to be exchanged with each other between the solvent in casting solution, and well solubilising additive to form more holes.
Further, the blade coating of casting solution preferably 100~200 μm, immerses the time of coagulating bath with a thickness of 100~300 μm
For 15~50min, to guarantee that coagulating bath is sufficiently exchanged with the solvent in casting solution.
Porous polyimide film prepared by the present invention, thickness is adjustable, porosity is high up to 40% or more, imbibition rate, film
With good lithium-ion electrolyte wetability and high temperature resistance.
In conclusion the present invention is not necessarily to high temperature and pressure, the requirement to membrane equipment is simple, is advantageously implemented large-scale industry
Change application.In addition, film thickness is adjustable, porosity is good up to 40% or more, imbibition rate height and lithium-ion electrolyte wetability,
High temperature resistance is excellent, is expected to become one of next-generation lithium ion battery separator material.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the scanning electron microscope image of the porous membrane prepared in embodiment 1；Wherein: figure (a) is table on film
Face figure, figure (b) are film lower surface figure；
Fig. 2 is the scanning electron microscope image of the porous membrane prepared in embodiment 2；Wherein: figure (a) is table on film
Face figure, figure (b) are film lower surface figure；
Fig. 3 is the scanning electron microscope image of the porous membrane prepared in embodiment 3；Wherein: figure (a) is table on film
Face figure, figure (b) are film lower surface figure；
Fig. 4 is the scanning electron microscope image of the porous membrane prepared in embodiment 4；Wherein: figure (a) is table on film
Face figure, figure (b) are film lower surface figure；Scheming (c) is thin-membrane section figure；
Fig. 5 is the porous membrane contact angle figure prepared in embodiment 4；
Fig. 6 is the porous membrane high temperature resistance figure prepared in embodiment 4.
Specific embodiment
The present invention provides a kind of porous polyimide film preparation methods, by dibasic anhydride, diamine in polar solvent
Low temperature poly condensation is carried out, presoma polyamic acid (PAA) solution is generated, appropriate additive is added in PAA and forms casting solution,
Casting solution is scratched on a glass through deaeration and is immersed in coagulating bath, is taken out after a certain period of time, naturally dry, through hot imidization
Or chemical imidization handles to obtain polyimide porous film.Without high temperature and pressure, the requirement to membrane equipment is simple, is conducive to
Realize heavy industrialization application.In addition, film thickness is adjustable, porosity is high up to 40% or more, imbibition rate, is electrolysed with lithium ion
Liquid wetability is good, high temperature resistance excellent high temperature resistance is had excellent performance, and is expected to become next-generation lithium ion battery separator material
One of.
A kind of porous polyimide film preparation method of the present invention, comprising the following steps:
It is poly- to generate presoma by S1, dibasic anhydride, the diamine low temperature poly condensation in polar solvent, 18~20h of mechanical stirring
Amic acid (PAA) solution, wherein the molar ratio of monomer dibasic anhydride and diamine is 1:1；
Dibasic anhydride is diphenyl sulphone (DPS) tetracid dianhydride, equal benzene tertacarbonic acid's dianhydride, biphenyltetracarboxylic dianhydride, benzophenone tetracid dianhydride, two
One of benzene hexafluoro isopropyl tetracid dianhydride, diphenyl sulfide tetracid dianhydride are a variety of；
Diamine is m-phenylene diamine (MPD), p-phenylenediamine, 4,4 '-diaminodiphenyl ethers, 4,3 '-diaminodiphenyl ethers, 3,3 '-two
One of benzene maple diamines, 4,4 '-hexichol maple diamines are a variety of.
Polar solvent be one of n,N-dimethylacetamide, n,N-Dimethylformamide, N-Methyl pyrrolidone or
It is a variety of.
Appropriate additive is added in S2, the presoma polyamic acid PAA solution synthesized to step S1 and forms casting solution, it is mechanical
Stir 2h or more；
The gross mass of dibasic anhydride and diamine is the 10%~20% of casting solution quality.Additive is small point for capableing of pore-creating
Sub- substance is glycerol, the triblock copolymer of polyethylene oxide and polypropylene oxide, polyethylene glycol, dibutyl phthalate
One of or it is a variety of, be casting solution quality 5%~30%.
Preferably, the amount of additive is the 20%~25% of casting solution quality.
S3, the casting solution that step S2 is synthesized is scratched on a glass and is immersed in coagulating bath, certain time through deaeration
After take out, naturally dry handles to obtain polyimide porous film through hot imidization or chemical imidization.
Coagulation bath composition is that phase counterdiffusion can be carried out between the solvent in casting solution, while can be by polyimide film
Interior additive dissolution, to form more porous substance in polyimide film, specially methanol, dehydrated alcohol, ethylene glycol,
One of glycerine and glycerol are a variety of.
The blade coating thickness of casting solution can be adjusted to 100~300 μm, preferably 100~200 μm.
The immersion coagulating bath time is adjusted according to the type difference of additive, specially 15~50min, preferably 20~
30min。
Polyimide porous film with a thickness of 6~40 μm, aperture is 0.5~3 μm, and porosity is more than or equal to 40%.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment 1
Referring to Fig. 1,2.39g4 is added in three-necked flask, 4 '-diaminodiphenyl ethers are dissolved in 20.35gN, N- dimethyl
It in acetamide, is sufficiently stirred, it is the equal benzene tertacarbonic acid's dianhydride of 2.61g that gross mass is then added in batches, and 5h is stirred at room temperature, obtains
PAA solution；
The glycerol for weighing 3.50gPAA solution and addition 5%, is sufficiently stirred 2h, obtains casting solution；
By casting solution standing or vacuum defoamation, with 100 μm of scrapers, routinely the tape casting technique obtains film, is then immersed in
15min in alcohol solidification bath, takes out film, and naturally dry is put into hot imidization in Muffle furnace, according to 100 DEG C/1h, 200 DEG C/1h,
The program staged elevated cure of 300 DEG C/1h；
After temperature drops to room temperature, film is taken off from glass plate mountain, obtains with a thickness of 10 μm, aperture is 0.5 μm, hole
The polyimide porous film of rate 80%.
As can be seen from Figure 1 select content be 5% glycerol as additive in the case where the coagulating bath time is shorter
There are some more uniform holes in the upper and lower surface of film.
Embodiment 2
Referring to Fig. 2,4,4 '-diaminodiphenyl ether of 2.39g is added in three-necked flask is dissolved in 20.35g N, N- diformazan
It in yl acetamide, is sufficiently stirred, it is the equal benzene tertacarbonic acid's dianhydride of 2.61g that gross mass is then added in batches, and 5h is stirred at room temperature, obtains
PAA solution；
It weighs 3.50gPAA solution and 20% dibutyl phthalate is added, 2h is sufficiently stirred, obtains casting solution；
By casting solution standing or vacuum defoamation, with 150 μm of scrapers, routinely the tape casting technique obtains film, is then immersed in
25min in alcohol solidification bath, takes out film, and naturally dry is put into hot imidization in Muffle furnace, according to 100 DEG C/1h, 200 DEG C/1h,
The program staged elevated cure of 300 DEG C/1h；
After temperature drops to room temperature, film is taken off from glass plate mountain, obtains with a thickness of 25 μm, aperture is 1.5 μm, hole
Rate is equal to 93% polyimide porous film.
Comparison diagram 1 selects dibutyl phthalate as can be seen from Figure 2 and increases the porous of coagulating bath time preparation
The porosity of film is higher.
Embodiment 3
Referring to Fig. 3,4,4 '-diaminodiphenyl ether of 2.39g is added in three-necked flask is dissolved in 20.35g N, N- diformazan
It in yl acetamide, is sufficiently stirred, it is the equal benzene tertacarbonic acid's dianhydride of 2.61g that gross mass is then added in batches, and 5h is stirred at room temperature, obtains
PAA solution；
It weighs 3.5gPAA solution and 30% dibutyl phthalate is added, 2h is sufficiently stirred, obtains casting solution；
By casting solution standing or vacuum defoamation, with 200 μm of scrapers, routinely the tape casting technique obtains film, is then immersed in
35min in alcohol solidification bath, takes out film, and naturally dry is put into hot imidization in Muffle furnace, according to 100 DEG C/1h, 200 DEG C/1h,
The program staged elevated cure of 300 DEG C/1h；
After temperature drops to room temperature, film is taken off from glass plate mountain, obtains with a thickness of 40 μm, aperture is 2.5 μm, hole
Rate is equal to 70% polyimide porous film.
Compare Fig. 2, it can be seen in figure 3 that additive level increases, the aperture increases of porous membrane.
Embodiment 4
Referring to Fig. 4,4,4 '-diaminodiphenyl ether of 2.39g is added in three-necked flask is dissolved in 20.35g N, N- diformazan
It in yl acetamide, is sufficiently stirred, it is the equal benzene tertacarbonic acid's dianhydride of 2.61g that gross mass is then added in batches, and 5h is stirred at room temperature, obtains
PAA solution；
It weighs 3.5gPAA solution and 23% dibutyl phthalate and the mixed solution of glycerol is added, be sufficiently stirred
2h obtains casting solution；
By casting solution standing or vacuum defoamation, with 300 μm of scrapers, routinely the tape casting technique obtains film, is then immersed in
50min in alcohol solidification bath, takes out film, and naturally dry is put into hot imidization in Muffle furnace, according to 100 DEG C/1h, 200 DEG C/1h,
The program staged elevated cure of 300 DEG C/1h；
After temperature drops to room temperature, film is taken off from glass plate mountain, obtains with a thickness of 13 μm, aperture is 3 μm, porosity
Polyimide porous film equal to 84% is labeled as 23%-PI.
By adjusting the type and content of additive, figure 4, it is seen that with dibutyl phthalate and glycerol
Mixed solution is the porous polyimide film thinner thickness of additive preparation, aperture is relatively uniform and hole with higher
Rate, imbibition rate and ionic conductivity can satisfy the demand of lithium ion battery separator.
Referring to Fig. 5, contact angle figure when Fig. 5 is 23%-PI porous membrane and lithium-ion electrolyte contact 20s, from figure
In it can be seen that it is only 29.3 ° that the perforated membrane for preparing in this way, which has contact angle, illustrate that it moistens with good electrolyte
It is moist.
Referring to Fig. 6, Fig. 6 is supplement figure, by comparing the thermal stability of PP and PE diaphragm, it can be seen that this material tool
The shortcomings that having higher thermal stability, polyalkene diaphragm heat resistance vehicle can be made up.
Thickness: any to choose film sample using the thickness of measured film thickness instrument (six water chestnut instrument plant of Shanghai) measurement membrane sample
10 point measurements of product are averaged.
Porosity: it is measured using n-butanol absorption process, claims to obtain dry film quality with electronic analytical balance, be subsequently placed into just
2h is impregnated in alcohol, then is weighed after being dried membrane surface with filter paper to wet film.
Calculate porosity:
Wherein, w0For dry weight (g)；wtFor weight in wet base (g)；ρ is the density (g/cm of solvent3)；V is diaphragm volume (cm3)
The ionic conductivity of composite diaphragm is tested on electrochemical workstation using AC impedence method.First use palm press will
Diaphragm is cut into disk, is clipped among two steel discs (SS), and a steel disc is working electrode, and one is reference electrode, injection electricity
SS/PP/SS system is packaged into CR2025 battery case after solution liquid to be tested.Test frequency range is set as 1-105Hz, amplitude
It is 5mV, ionic conductivity can be calculated according to formula:
δ=L/RS
Wherein, δ is ionic conductivity (S/cm)；L is film thickness (μm)；R is bulk resistance (Ω)；S is test electrode
Effective contact area (cm2)。
It is the LiPF of 1.0mol/L that composite diaphragm, which is infiltrated in solute,6, solvent is the dilute vinegar of carbonic acid second (EC), diethyl carbonate
(DEC) and in the electrolyte of dimethyl carbonate (DMC) (three's volume ratio is 1:1:1), soaking time 2h, after being dried with filter paper
Weigh wet film quality.Calculate the imbibition rate of composite diaphragm are as follows:
λ=(W2-W1)/W1× 100%
Wherein, λ is imbibition rate (%)；W1It is dry film quality (g)；W2It is the wet film quality (g) after impregnating.
The performance of the porous polyimide film of examples detailed above preparation is tested, as a result as described in Table 1:
| Embodiment | Thickness (μm) | Porosity | Imbibition rate | Ionic conductivity |
| Example 1 | 6 | 40% | 200% | 0.21×10-4 |
| Example 2 | 25 | 80% | 280% | 1.46×10-4 |
| Example 3 | 40 | 70% | 220% | 1.03×10-4 |
| Example 4 | 13 | 84% | 260% | 1.23×10-4 |
It as seen from the above table, is the porous polyamides of additive preparation to the mixed solution of dibutyl phthalate and glycerol
Imines film porosity with higher, imbibition rate and ionic conductivity and thinner thickness, this outer film have good lithium
Ion electrolyte wetability and high temperature resistance are expected to become one of next-generation lithium ion battery separator material.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (10)
1. a kind of porous polyimide film preparation method, which is characterized in that carry out dibasic anhydride, diamine in polar solvent
Low temperature poly condensation generates presoma polyamic acid PAA solution, and additive is added in presoma polyamic acid PAA solution and is stirred
It mixes to form casting solution, casting solution is scratched on a glass through deaeration and is immersed in coagulating bath, then takes out simultaneously naturally dry, warp
Hot imidization or chemical imidization handle to obtain porous polyimide film.
2. porous polyimide film preparation method according to claim 1, which is characterized in that dibasic anhydride and diamine
Molar ratio is 1:1.
3. porous polyimide film preparation method according to claim 1 or 2, which is characterized in that dibasic anhydride is hexichol
Sulfone tetracid dianhydride, equal benzene tertacarbonic acid's dianhydride, biphenyltetracarboxylic dianhydride, benzophenone tetracid dianhydride, hexichol hexafluoro isopropyl tetracid dianhydride,
One of diphenyl sulfide tetracid dianhydride is a variety of；Diamine be m-phenylene diamine (MPD), p-phenylenediamine, 4,4 '-diaminodiphenyl ethers, 4,
One of 3 '-diaminodiphenyl ethers, 3,3 '-hexichol maple diamines, 4,4 '-hexichol maple diamines are a variety of.
4. porous polyimide film preparation method according to claim 1 or 2, which is characterized in that dibasic anhydride and binary
The gross mass of amine is the 10%~20% of casting solution quality.
5. porous polyimide film preparation method according to claim 1, which is characterized in that additive accounts for casting solution matter
The 5%~30% of amount, mixing time are more than or equal to 2h.
6. porous polyimide film preparation method according to claim 5, which is characterized in that additive is glycerol, gathers
One of ethylene oxide and the triblock copolymer of polypropylene oxide, polyethylene glycol, dibutyl phthalate are a variety of.
7. porous polyimide film preparation method according to claim 1, which is characterized in that coagulating bath is methanol, nothing
One of water-ethanol, ethylene glycol, glycerine, glycerol are a variety of.
8. porous polyimide film preparation method according to claim 1, which is characterized in that the blade coating thickness of casting solution
It is 100~300 μm, the time for immersing coagulating bath is 15~50min.
9. the porous polyimide film prepared method according to claim 1, which is characterized in that porous polyimide film
With a thickness of 6~40 μm, aperture is 0.5~3 μm, and porosity is more than or equal to 40%.
10. application of the porous polyimide film described in claim 9 in battery diaphragm material.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880574A (en) * | 2019-11-28 | 2020-03-13 | 衡阳市鑫晟新能源有限公司 | Lithium battery isolation film and preparation method thereof |
| CN111640902A (en) * | 2020-06-08 | 2020-09-08 | 淮北市吉耐新材料科技有限公司 | Preparation process of lithium battery diaphragm |
| CN111772642A (en) * | 2020-07-14 | 2020-10-16 | 天津大学 | Breathable flexible skin electrochemical sensor and preparation method and application thereof |
| CN112111079A (en) * | 2020-09-24 | 2020-12-22 | 广东省科学院生物工程研究所 | Dopamine modified polyimide battery diaphragm and preparation method and application thereof |
| CN114716858A (en) * | 2022-04-24 | 2022-07-08 | 住井科技(深圳)有限公司 | Low dielectric surge-resistant varnish and insulated wire |
| CN114716859A (en) * | 2022-04-24 | 2022-07-08 | 住井科技(深圳)有限公司 | Insulating varnish and insulated wire |
| CN115322431A (en) * | 2022-09-19 | 2022-11-11 | 吉林大学 | Low-dielectric cross-linked porous polyimide film and preparation method thereof |
| CN115678065A (en) * | 2022-11-07 | 2023-02-03 | 广东省科学院生物与医学工程研究所 | Preparation method and application of polyimide film |
| WO2023206761A1 (en) * | 2022-04-24 | 2023-11-02 | 住井科技(深圳)有限公司 | Insulated wire |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006351365A (en) * | 2005-06-16 | 2006-12-28 | Tomoegawa Paper Co Ltd | Separator for electronic components, and the electronic component |
| CN102516582A (en) * | 2011-12-21 | 2012-06-27 | 桂林电器科学研究院 | Manufacturing method of porous polyimide film |
| CN104177639A (en) * | 2014-09-09 | 2014-12-03 | 北京航空航天大学 | Efficient thermal-insulation polyimide film and preparation method thereof |
| CN105576176A (en) * | 2016-01-29 | 2016-05-11 | 中南大学 | Preparation method of high-safety lithium-ion battery separator |
| CN105778130A (en) * | 2016-03-18 | 2016-07-20 | 西北工业大学 | High-strength high-heat-resistance polyimide microporous thin film and preparation method thereof |
| CN108365151A (en) * | 2018-01-31 | 2018-08-03 | 青岛蓝科途膜材料有限公司 | A kind of polyimide high temperature-resistant lithium battery diaphragm and preparation method thereof |
-
2019
- 2019-07-03 CN CN201910592741.6A patent/CN110256717A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006351365A (en) * | 2005-06-16 | 2006-12-28 | Tomoegawa Paper Co Ltd | Separator for electronic components, and the electronic component |
| CN102516582A (en) * | 2011-12-21 | 2012-06-27 | 桂林电器科学研究院 | Manufacturing method of porous polyimide film |
| CN104177639A (en) * | 2014-09-09 | 2014-12-03 | 北京航空航天大学 | Efficient thermal-insulation polyimide film and preparation method thereof |
| CN105576176A (en) * | 2016-01-29 | 2016-05-11 | 中南大学 | Preparation method of high-safety lithium-ion battery separator |
| CN105778130A (en) * | 2016-03-18 | 2016-07-20 | 西北工业大学 | High-strength high-heat-resistance polyimide microporous thin film and preparation method thereof |
| CN108365151A (en) * | 2018-01-31 | 2018-08-03 | 青岛蓝科途膜材料有限公司 | A kind of polyimide high temperature-resistant lithium battery diaphragm and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 俞汝勤: "隔膜式气敏氨电极的研制", 《湖南大学学报》 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880574A (en) * | 2019-11-28 | 2020-03-13 | 衡阳市鑫晟新能源有限公司 | Lithium battery isolation film and preparation method thereof |
| CN111640902A (en) * | 2020-06-08 | 2020-09-08 | 淮北市吉耐新材料科技有限公司 | Preparation process of lithium battery diaphragm |
| CN111772642B (en) * | 2020-07-14 | 2023-10-31 | 天津大学 | Breathable flexible-skin electrochemical sensor and preparation method and application thereof |
| CN111772642A (en) * | 2020-07-14 | 2020-10-16 | 天津大学 | Breathable flexible skin electrochemical sensor and preparation method and application thereof |
| CN112111079A (en) * | 2020-09-24 | 2020-12-22 | 广东省科学院生物工程研究所 | Dopamine modified polyimide battery diaphragm and preparation method and application thereof |
| CN112111079B (en) * | 2020-09-24 | 2023-05-16 | 广东省科学院生物工程研究所 | Dopamine-modified polyimide battery diaphragm and preparation method and application thereof |
| CN114716859A (en) * | 2022-04-24 | 2022-07-08 | 住井科技(深圳)有限公司 | Insulating varnish and insulated wire |
| CN114716858A (en) * | 2022-04-24 | 2022-07-08 | 住井科技(深圳)有限公司 | Low dielectric surge-resistant varnish and insulated wire |
| WO2023206762A1 (en) * | 2022-04-24 | 2023-11-02 | 住井科技(深圳)有限公司 | Low-dielectric surge-resistant varnish and insulated wire |
| WO2023206761A1 (en) * | 2022-04-24 | 2023-11-02 | 住井科技(深圳)有限公司 | Insulated wire |
| WO2023206760A1 (en) * | 2022-04-24 | 2023-11-02 | 住井科技(深圳)有限公司 | Insulating varnish and insulated wire |
| CN115322431A (en) * | 2022-09-19 | 2022-11-11 | 吉林大学 | Low-dielectric cross-linked porous polyimide film and preparation method thereof |
| CN115678065A (en) * | 2022-11-07 | 2023-02-03 | 广东省科学院生物与医学工程研究所 | Preparation method and application of polyimide film |
| CN115678065B (en) * | 2022-11-07 | 2024-03-19 | 广东省科学院生物与医学工程研究所 | Preparation method and application of polyimide film |
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