CN107452922A - A kind of lithium battery isolation membrane and its production and use - Google Patents
A kind of lithium battery isolation membrane and its production and use Download PDFInfo
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- CN107452922A CN107452922A CN201610369285.5A CN201610369285A CN107452922A CN 107452922 A CN107452922 A CN 107452922A CN 201610369285 A CN201610369285 A CN 201610369285A CN 107452922 A CN107452922 A CN 107452922A
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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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a kind of lithium battery isolation membrane and its production and use.Contain cellulose and high molecular weight flame retardant in the constitutive material of the barrier film.
Description
Technical field
The present invention relates to electrochemical field, more particularly to a kind of cellulose non-woven barrier film and preparation method thereof and
Purposes.
Background technology
In recent years, with the fast development in electric automobile field, battery charge and discharge long-term under high power density
Electricity, it is too high to easily cause internal temperature of battery, and therefore, the barrier film used electrokinetic cell is at high power
Security performance proposes higher requirement.The main function of barrier film in the battery is the positive negative film of isolation battery, prevented
Only battery short circuit and the passage of offer ion transmission.Therefore, security performance and electrochemistry of the barrier film for battery
Performance plays vital effect.If the heat endurance of barrier film is poor, in lasting high power discharge and recharge
During, because battery thermal diffusivity is bad, local temperature can be caused to raise, pass through the research of accelerating calorimeter
Show, battery is run at high temperature, can also supervene a series of negative effect, as high temperature can cause
The decomposition of lithium salts, further heats up battery, the severe attrition performance of battery, meanwhile, if battery temperature
Height is spent, the softening of TPO barrier film can be made to cause both positive and negative polarity directly to contact, battery short circuit is caused or even occurs
Blast.
Cellulose is a kind of natural renewable polymer resource being widely present in nature, and it is widely present
In timber, cotton, non-wood, part protozoan and plant matrix.Cellulose resource is abundant,
It is environment-friendly, cost is low and has excellent performance, by widely should be in every field, due to fibre
Hydrophilic characteristic of dimension element itself, the wellability of cellulosic separator is good, while cellulosic separator heat endurance is good,
Less than 300 DEG C do not occur thermal contraction.But current cellulosic separator is too thick, bad mechanical strength and imbibition
Property is poor, limits its application.
Therefore, this area is there is an urgent need to provide both using the above-mentioned advantage of cellulose, at the same and can make it is compound
Reach the basic demand of lithium ion battery every film strength.
The content of the invention
A kind of the present invention is intended to provide cellulose non-woven barrier film of lithium ion battery and preparation method thereof.
In the first aspect of the present invention, there is provided a kind of lithium battery isolation membrane, in the constitutive material of the barrier film
Contain cellulose and high molecular weight flame retardant.
In another preference, barrier film dimensional contraction rate at 200 DEG C is less than 0.1%；The isolation
The ventilative value of film is 50-300s/100cc, more preferably 80-300s/100cc；The electrolyte of the barrier film is inhaled
Yield 50-1000%, more preferably more than 500%.
In another preference, the thickness of the barrier film is 10-500 μm, mechanical tensile strength 155-543
kgf/cm2。
In another preference, the high molecular weight flame retardant is selected from following one or more：Fluoropolymer
Thing, PAEK, polyimides, polymethyl methacrylate, aromatic polysulfonamide and aramid fiber.
In the second aspect of the present invention, there is provided a kind of lithium battery isolation membrane provided by the invention as described above
Preparation method, methods described include step：
(1) cellulose pulp and high molecular weight flame retardant are mixed with dispersion liquid, is beaten, obtains cellulose slurries；
(2) cellulose slurries progress copy paper is obtained into hygrometric state barrier film；With
(3) barrier film provided by the invention as described above is obtained after drying.
In another preference, in step (1), the mass ratio of high molecular weight flame retardant and cellulose pulp is 1：
25-1：1, more preferably 1：15-1：1, most preferably 1：5-1：1.
In another preference, the beating consistency described in step (1) is 30-99 ° of SR, more preferably 35-70
°SR；Mechanical roller Compressive Strength in mashing is 10-50MPa, more preferably 20-45MPa；Roll temperature is
20-100 DEG C, more preferably 35-85 DEG C.
In another preference, high molecular weight flame retardant described in step (1) is selected from following one or more：
Fluoropolymer, PAEK, polyimides, polymethyl methacrylate, aromatic polysulfonamide and aramid fiber；
The dispersion liquid is selected from following one or more：Acetone, tetrahydrofuran, 1-METHYLPYRROLIDONE,
N,N-dimethylformamide and DMAC N,N' dimethyl acetamide.
In the third aspect of the present invention, there is provided a kind of barrier film provided by the invention as described above is preparing lithium
Purposes in battery；The lithium battery includes positive pole, negative pole, as described above between positive pole and negative pole
Barrier film provided by the invention.
In the fourth aspect of the present invention, there is provided a kind of high molecular weight flame retardant answering in lithium battery isolation membrane is prepared
With the high molecular weight flame retardant is selected from following one or more：Fluoropolymer, PAEK, gather
Acid imide, polymethyl methacrylate, aromatic polysulfonamide and aramid fiber；The high molecular weight flame retardant is preparing lithium
Shared in battery isolating film with cellulose.
Accordingly, the invention provides both using cellulose the advantages of, while and can makes the intensity of composite diaphragm
Reach the barrier film of the basic demand of lithium ion battery.
Embodiment
For inventor by in-depth study extensively, discovery can add macromolecule resistance into cellulose pulp
Combustion things matter, one side high molecular fire retardant thing and cellulose provide a skeleton jointly, on the other hand by ultra-fine
After friction glazed machine grinding, high molecular fire retardant thing provides the effect for cohering cellulose, both effects mutually association
Together, the mechanical strength of barrier film is improved.On this basis, the present invention is completed.
As used herein, " cellulose (cellulose) " be by glucose group into macromolecular polysaccharide.It is
The main component of plant cell wall, generally it is combined together with hemicellulose, pectin and lignin.It is produced
Raw material sources are in timber, cotton, cotton linter, wheat straw, straw, reed, fiber crops, mulberry skin, paper mulberry skin and sugarcane
Slag etc..There are a variety of methods to obtain cellulose in this area, such as, but not limited to, be referred to as " being referred to as sulfurous acid
The industrial making method of salt method and alkaline process "；Be made using inorganic acid after alpha-cellulose makes cellulose make part through processing
Depolymerization, then remove again obtained by non-crystallized part and purification；Industrial wood-pulp board is discongested, hydrochloric
Heat up hydrolysis in reactor, the product obtained by liquid caustic soda is adjusted to neutrality；By wood pulp or cotton pulp through bleaching
Formed with being refined after mechanical dispersion.
As used herein, " copy paper " is that paper pulp is made to the technical process of paper.In modern paper industry generally
It is carried out continuously on a papermaking machine.
In the present invention, if without particularly illustrating, percentage (%) or part all refer to relative to combination
The percetage by weight or parts by weight of thing.
In the present invention, if without particularly illustrating, involved each component or its preferred ingredient can phases
Mutually combination forms new technical scheme.
In the present invention, if without particularly illustrating, all embodiments mentioned in this article and preferably
Embodiment can be mutually combined to form new technical scheme.
In the present invention, if without particularly illustrating, all technical characteristics mentioned in this article and preferably
Feature can be mutually combined to form new technical scheme.
In the present invention, unless otherwise indicated, number range " a-b " represents any reality between a to b
The breviary that array is closed represents that wherein a and b are real numbers.Such as number range " 0-5 " represents herein
Through all listing whole real numbers between " 0-5 ", " 0-5 " is that the breviary of these combinations of values represents.
In the present invention, unless otherwise indicated, integer number range " a-b " represents times between a to b
The breviary for integer combinations of anticipating represents that wherein a and b are integers.Such as integer number range " 1-N " table
Show that 1,2 ... N, wherein N are integers.
If be not specifically stated, the term " one kind " used in this specification refers to " at least one ".
If be not specifically stated, the benchmark of percentage (including percetage by weight) of the present invention is all
The gross weight of the composition.
" scope " disclosed herein is in the form of lower and upper limit.Can be respectively one or more lower limits,
With one or more upper limits.Given range is defined by selecting a lower limit and a upper limit.Choosing
Fixed lower and upper limit define the border of special scope.All scopes that can be defined by this way are
Comprising and can be combined, i.e., any lower limit can combine to form a scope with any upper limit.For example, it is directed to
Special parameter lists 60-120 and 80-110 scope, is interpreted as 60-110 and 80-120 model
Enclose is also what is expected.If in addition, the minimum zone value 1 and 2 listed, and if list maximum model
Value 3,4 and 5 is enclosed, then following scope can be expected all：1-3,1-4,1-5,2-3,2-4,
And 2-5.
Herein, unless otherwise indicated, each reactions steps can be carried out sequentially, can also be out of order
Carry out.For example, other steps can be included between each reactions steps, and can also between reactions steps
Reversed order.Preferably, reaction method herein is that order is carried out.
Barrier film
Contain cellulose and high molecular weight flame retardant in the raw material of barrier film provided by the invention.
The high molecular weight flame retardant that the present invention uses can both improve the heat resistance of the barrier film finally obtained, again can be with
Further improve the ventilative value of the barrier film obtained by paper-making process.
High molecular weight flame retardant of the present invention is selected from following one or more：Fluoropolymer, poly- virtue
Ether ketone, polyimides, polymethyl methacrylate, aromatic polysulfonamide and aramid fiber.
The preferred p-aramid fiber of the aramid fiber, PSA fiber.
Barrier film provided by the invention dimensional contraction rate at 200 DEG C is less than 0.1%；More preferably 0.07% with
Under.
It is 50-300s/100cc that feature possessed by barrier film provided by the invention, which also has ventilative value, preferably
80-300s/100cc；Electrolyte absorptivity 50-1000%, preferably more than 500%.
Isolate membrane preparation method
The preparation method of barrier film provided by the invention comprises the steps：
The first step, cellulose pulp and high molecular weight flame retardant are mixed with dispersion liquid, are beaten, obtain cellulose slurry
Dregs of rice polishing liquid；
Second step, cellulose pulp polishing liquid is subjected to copy paper and obtains hygrometric state barrier film；
3rd step, barrier film provided by the invention is obtained after drying.
In the above-mentioned first step, the mass percent of used cellulose pulp is 15-75%, preferably 20-70
%；The mass ratio of used high molecular weight flame retardant and cellulose pulp is 1：25-1：1, preferably 1：15-1：
1, more preferably 1：5-1：1.
Dispersion liquid in the above-mentioned first step is selected from following one or more：Acetone, tetrahydrofuran, N- first
Base pyrrolidones, N,N-dimethylformamide and DMAC N,N' dimethyl acetamide.
In one embodiment of the invention, the mixing in the above-mentioned first step is by cellulose pulp and macromolecule
Fire retardant is immersed in 12-36 hours in dispersion liquid, preferably 20-30 hours.
In the above-mentioned first step, above-mentioned beating consistency is 30-99 ° of SR, preferably 35-70 ° of SR；The machinery of mashing
Roll-in intensity is 10-50MPa, preferably 20-45MPa；Roll temperature is 20-100 DEG C, preferably 35-85 DEG C.
In one embodiment of the invention, the above-mentioned first step by cellulose pulp and high molecular weight flame retardant and is divided
After dispersion liquid mixing, first tentatively ground, obtain cellulose pulp mixed liquor, then carried out extra-fine grinding again and obtain
Cellulose pulp polishing liquid.Preliminary grinding can use fiberizer commonly used in the art, such as, but not limited to, PFI
Fiberizer, preliminary grinding can have rotating speed not have to rotating speed, have rotating speed in ten thousand turns of 1.5-2.5.It is ultra-fine to grind
Mill can use grinder commonly used in the art, such as, but not limited to, ultra-fine friction glazed machine etc..
Copy paper in above-mentioned second step can use paper machine commonly used in the art to carry out.
Drying in above-mentioned 3rd step includes constant temperature drying, hot pressing and vacuum drying.
In a kind of preferred embodiment of the present invention, the temperature of constant temperature drying is 70-100 DEG C, preferably 75-95 DEG C；
Hot pressing is at 80-130 DEG C, preferably 90-120 DEG C, is carried out under 10-40MPa, preferably 15-30MPa；Vacuum is done
Dry temperature is 70-140 DEG C, preferably 80-120 DEG C, handles 6-24 hours.
In one embodiment of the invention, the drying is first to be dried in constant temperature oven, then
Hot pressing is carried out, is finally handled in vacuum drying oven.
Lithium battery
The present invention provides a kind of lithium battery, including positive pole, negative pole and is interval between adjacent positive and negative pole
Barrier film provided by the invention.
The lithium battery includes but is not limited to, lithium secondary battery and lithium rechargeable battery；The lithium ion two
Primary cell includes polymer lithium ion secondary battery.
The features described above that the present invention mentions, or the feature that embodiment is mentioned can be in any combination.This case specification institute
All features disclosed can be used in combination with any combinations thing form, and each feature disclosed in specification can be with any
The alternative characteristics substitution of identical, impartial or similar purpose can be provided.Therefore removing has special instruction, disclosed spy
Sign is only impartial or similar features general examples.
Main advantages of the present invention are：
1st, barrier film high temperature resistant provided by the invention, there is preferable gas permeability, higher absorbency and suitable
Suitable mechanical strength.
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are only used for
The bright present invention rather than limitation the scope of the present invention.The experiment side of unreceipted actual conditions in the following example
Method, generally according to normal condition or according to the condition proposed by manufacturer.Unless otherwise indicated, otherwise institute
Some percentage, ratio, ratio or number are by weight.
The unit in percent weight in volume in the present invention is well-known to those skilled in the art, is, for example,
Refer to the weight of the solute in 100 milliliters of solution.
Unless otherwise defined, all specialties used in text and scientific words and one skilled in the art institute are ripe
The meaning known is identical.In addition, any method similar or impartial to described content and material all can be applied to
In the inventive method.Preferable implementation described in text only presents a demonstration with material to be used.
Cotton Pulp, hemp dissolving pulp, wood pulps are purchased from Shandong YINYING Chemical Fiber Co., Ltd in embodiment.
Different barrier films in embodiment and comparative example carry out test and the sign of performance：
Film thickness：The thickness of different barrier films is tested using micrometer (0.01 millimeter of precision), arbitrarily takes sample
On 5 points, average.
Gas permeability：Using Gurley Permeability gauges come the gas permeability of measuring diaphragm, i.e., 100mL air by every
Time required for film.
Porosity：Barrier film is immersed in n-butanol 10 hours, porosity is then calculated according to formula：
P=(Mb/ ρ b)/(Mb/ ρ b+Mp/ ρ p) × 100%
Wherein, ρ b and ρ p are the density of n-butanol and the dry density of cellulose, and Mb and Mp are film suctions
The quality and tunica fibrosa of the n-butanol quality of itself.
Pick up：Barrier film infiltration 10 hours in the electrolytic solution, the electrolyte in barrier film is set to reach saturation,
The quality tested respectively before and after barrier film Electolyte-absorptive, is calculated according to below equation：
EU={ (W-Wo)/Wo } × 100%
Wherein, Wo and W is the quality of barrier film before and after Electolyte-absorptive.
Tensile strength：Fire-retardant cellulose barrier film is tested using GB1040-79 plastic tensile experimental method
Tensile strength and elongation.
Embodiment 1
The preparation of barrier film
Cotton Pulp and polyimides are soaked into 24 hours (polyamide and cottons in 1-METHYLPYRROLIDONE solution
The mass ratio of pulp is 1：14), then 20,000 turns of defibrination in PFI fiberizers, obtain Cotton Pulp and mix
Close liquid.Cotton Pulp mixed liquor is ground to obtain Cotton Pulp polishing liquid by ultra-fine friction glazed machine.Mashing
Concentration is 45 ° of SR, and the intensity of mechanical roll-in is 20MPa, and roll temperature is 35 DEG C.
The Cotton Pulp of preparation is polished liquid, cellulosic separator is prepared with paper machine, obtained wet cellulose every
Film, dried first under constant temperature oven (75 DEG C), hot pressing is then carried out under 120 DEG C, 20MPa, finally
Cellulosic separator is put into drying process 6 hours in 120 DEG C of vacuum drying ovens.
Embodiment 2
The preparation of barrier film
Hemp dissolving pulp and p-aramid fiber are soaked to 24 hours (p-aramid fiber and fiber crops in N,N-dimethylformamide
The mass ratio of pulp is 3：4) preliminary grinding then, is carried out under no rotating speed with PFI fiberizers.
Sample is made in obtained hemp dissolving pulp mixed liquor, sampling.Hemp dissolving pulp mixed liquor is entered by ultra-fine friction glazed machine
Row grinding obtains hemp dissolving pulp polishing liquid.Beating consistency is 45 ° of SR, and the intensity of mechanical roll-in is 45MPa, roller
It is 85 DEG C to press temperature.
By the hemp dissolving pulp polishing liquid of preparation, cellulose non-woven film, obtained wet cellulose are prepared with paper machine
Nonwoven film, dried first under constant temperature oven (95 DEG C), hot pressing then carried out under 100 DEG C, 30MPa,
Cellulosic separator is finally put into drying process 12 hours in 100 DEG C of vacuum drying ovens.
Embodiment 3
The preparation of barrier film
Wood pulps and PSA fiber are soaked to 24 hours (PSA fiber and wood in DMAC N,N' dimethyl acetamide solution
The mass ratio of pulp is 1：2) preliminary grinding then, is carried out under no rotating speed with PFI fiberizers.
Sample is made in obtained wood pulps mixed liquor, sampling.Wood pulps mixed liquor is entered by ultra-fine friction glazed machine
Row grinding obtains wood pulps polishing liquid.Beating consistency is 70 ° of SR, and the intensity of mechanical roll-in is 30MPa, roller
It is 70 DEG C to press temperature.
By the wood pulps polishing liquid of preparation, cellulosic separator, obtained wet cellulose are prepared with handsheet machine
Barrier film, dried first under constant temperature oven (85 DEG C), hot pressing is then carried out under 90 DEG C, 15MPa, finally
Cellulosic separator is put into drying process 24 hours in 80 DEG C of vacuum drying ovens.
Embodiment 4
The preparation of barrier film
Wood pulps and PAEK are soaked into 24 hours (PAEK and the mass ratioes of wood pulps in acetone
For 1：1.38) preliminary grinding then, is carried out under different rotating speeds with PFI fiberizers, obtained wood pulp
Dregs of rice mixed liquor.Wood pulps mixed liquor is ground to obtain wood pulps polishing liquid by ultra-fine friction glazed machine.
Beating consistency is 37 ° of SR, and the intensity of mechanical roll-in is 20MPa, and roll temperature is 50 DEG C.
By the wood pulps polishing liquid of preparation, cellulose non-woven film, obtained hygrometric state fiber are prepared with handsheet machine
Plain barrier film, dried first under constant temperature oven (95 DEG C), hot pressing then carried out under 120 DEG C, 20MPa,
Cellulosic separator is finally put into drying process 12 hours in 120 DEG C of vacuum drying ovens.
Comparative example 1
Using commercialization dry method polypropylene diaphragm as a comparison, to illustrate fire-retardant cellulose barrier film in this patent
Associated advantages.
Comparative example 2
Using certain external PET based nonwovens sample film of commercialization.As a comparison, to illustrate in this patent
The associated advantages of cellulosic separator.
Comparative example 3
Hemp dissolving pulp and p-aramid fiber are soaked to 24 hours (p-aramid fiber and fiber crops in N,N-dimethylformamide
The mass ratio of pulp is 1：30), other steps such as embodiment 2.
Comparative example 4
Hemp dissolving pulp and p-aramid fiber are soaked to 24 hours (p-aramid fiber and fiber crops in N,N-dimethylformamide
The mass ratio of pulp is 2：1), other steps such as embodiment 2.
The correlated performance test result of embodiment and comparative example is shown in Table 1.
Table 1
As a result show, the heat resistant type cellulose non-woven film prepared using method provided by the invention has higher
Absorbency, suitable mechanical strength and preferably anti-hot shortness, while both mass ratios are to the property of material
It can influence.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not limited to the substantial technological of the present invention
Context, substantial technological content of the invention are broadly to be defined in the right of application, are appointed
What other people technology entities completed or method, if with the right of application defined in it is identical,
Also or a kind of equivalent change, will be considered as being covered by among the right.
Claims (10)
1. a kind of lithium battery isolation membrane, it is characterised in that contain cellulose and height in the constitutive material of the barrier film
Molecule fire retardant.
2. barrier film as claimed in claim 1, it is characterised in that barrier film size at 200 DEG C is received
Shrinkage is less than 0.1%.
3. barrier film as claimed in claim 2, it is characterised in that the ventilative value of the barrier film is
50-300s/100cc (preferably 80-300s/100cc), electrolyte absorptivity 50-1000% (preferably 500% with
On).
4. the barrier film as described in claim any one of 1-3, it is characterised in that the high molecular weight flame retardant choosing
From following one or more：Fluoropolymer, PAEK, polyimides, poly-methyl methacrylate
Ester, aromatic polysulfonamide and aramid fiber.
A kind of 5. preparation method of lithium battery isolation membrane as described in claim any one of 1-4, it is characterised in that
Methods described includes step：
(1) cellulose pulp and high molecular weight flame retardant are mixed with dispersion liquid, is beaten, obtains cellulose slurries；
(2) cellulose slurries progress copy paper is obtained into hygrometric state barrier film；
(3) barrier film as described in claim any one of 1-4 is obtained after drying.
6. preparation method as claimed in claim 5, it is characterised in that in step (1), high molecular weight flame retardant
Mass ratio with cellulose pulp is 1：25-1：1, preferably 1：15-1：1, more preferably 1：5-1：1.
7. preparation method as claimed in claim 5, it is characterised in that the beating consistency described in step (1)
For 30-99oSR (preferably 35-70 ° of SR), the mechanical roller Compressive Strength in mashing for 10-50MPa (preferably
20-45MPa), roll temperature is 20-100 DEG C (preferably 35-85 DEG C).
8. preparation method as claimed in claim 5, it is characterised in that high molecular fire retardant described in step (1)
Agent is selected from following one or more：Fluoropolymer, PAEK, polyimides, polymethyl
Sour methyl esters, aromatic polysulfonamide and aramid fiber；The dispersion liquid is selected from following one or more：Acetone,
Tetrahydrofuran, 1-METHYLPYRROLIDONE, N,N-dimethylformamide and DMAC N,N' dimethyl acetamide.
A kind of 9. purposes of barrier film as described in claim any one of 1-4 in lithium battery is prepared；The lithium electricity
Pond includes positive pole, negative pole, the barrier film as described in claim any one of 1-4 between positive pole and negative pole.
10. a kind of application of high molecular weight flame retardant in lithium battery isolation membrane is prepared, the high molecular weight flame retardant are selected from
Following one or more：Fluoropolymer, PAEK, polyimides, poly-methyl methacrylate
Ester, aromatic polysulfonamide and aramid fiber；The high molecular weight flame retardant closes in lithium battery isolation membrane is prepared with cellulose
With.
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| CN111129404A (en) * | 2019-12-25 | 2020-05-08 | 河北金力新能源科技股份有限公司 | Modified PMMA diaphragm slurry, lithium battery diaphragm and preparation method and application thereof |
| CN113067097A (en) * | 2021-02-25 | 2021-07-02 | 天津科技大学 | Lithium ion battery diaphragm paper and preparation method thereof |
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Application publication date: 20171208 |