CN108232091A - Battery isolating film preparation method - Google Patents
Battery isolating film preparation method Download PDFInfo
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- CN108232091A CN108232091A CN201810022891.9A CN201810022891A CN108232091A CN 108232091 A CN108232091 A CN 108232091A CN 201810022891 A CN201810022891 A CN 201810022891A CN 108232091 A CN108232091 A CN 108232091A
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- China
- Prior art keywords
- isolating film
- battery isolating
- battery
- film preparation
- preparation
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Classifications
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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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides preparation method described in a kind of battery isolating film preparation method and includes at least following steps：Mixture is squeezed out, is cast slab, primary to wash, biaxial tension, secondary washing, thermal finalization.It is extracted using battery isolating film preparation method of the present invention without using organic solvent, while the battery isolating film prepared has relatively low micropore size, the pore-size distribution of uniform concentration, good porosity and film-strength.
Description
Technical field
The present invention relates to a kind of battery isolating film preparation methods.
Background technology
Lithium ion battery is usually mainly made of anode, cathode, diaphragm, electrolyte and battery case.Lithium ion battery
In structure, diaphragm is one of crucial interior layer assembly.The main function of diaphragm is to separate the positive and negative electrode of battery, is prevented
Positive and negative anodes are in direct contact and short-circuit, while electrolyte ion also to be enable to be passed through in battery charge and discharge process, are formed
Electric current；When battery operating temperature is abnormal raising, the migrating channels of electrolyte ion are closed, cut-out electric current ensures battery peace
Entirely.It can be seen that the performance of diaphragm determines the interfacial structure of battery, internal resistance etc., directly affect the capacity of battery, cycle and
The characteristics such as security performance, the diaphragm haveing excellent performance play an important role the comprehensive performance for improving battery.Presently commercially available lithium
Ion battery diaphragm generally uses polyolefin porous membrane.
The Specifeca tion speeification of battery isolating film includes thickness, porosity, pore size, pore-size distribution, intensity, thermal contraction
Rate, closed pore temperature and broken film temperature etc..In order to reduce the internal resistance of cell, electrode area must be as big as possible, so for diaphragm
Thickness requirement is thin as far as possible.Although battery diaphragm is non-conductive in itself, conductive ion needs to be migrated by diaphragm, this
Diaphragm is required to be needed in itself there are a certain number of holes, i.e. porosity, but porosity is excessively high certainly will to cause diaphragm intensity to drop
It is low, influence battery global reliability.In addition to this, wellability of the electrolyte on diaphragm directly affects the resistance of Ion transfer,
Wellability is better, and ion is smaller by the resistance that diaphragm is migrated, and the internal resistance of cell is also just smaller.In general, in aperture not right and wrong
In the case of often big, pore-size distribution is more uniform, and the wellability of electrolyte is better.Battery component needs during its production and assembly
Diaphragm is drawn, also needs to ensure that diaphragm will not be pierced through, therefore diaphragm is not only needed by electrode material after finishing assembly
Enough tensile strengths also need to certain puncture intensity.Hot receipts can occur under certain heating condition for polymeric barrier films
Contracting, for avoid being heat-shrinked the positive and negative anodes that bring be in direct contact and caused by internal short-circuit, also have one to the percent thermal shrinkage of isolation film
Fixed requirement.Lithium ion battery in exception conditions, as outside line occur short circuit when, since electric current is excessive, inside battery temperature
Degree drastically increases, this just needs diaphragm that can close the migrating channels of conductive ion in time.Therefore, by the micropore of battery isolating film
The temperature that melting is closed occurs and is known as closed pore temperature.When temperature continues raising, isolation film fusing rupture occurs, this fusing is broken
It splits temperature and is known as broken film temperature.Consider from the security standpoint of lithium ion battery, the closed pore temperature and broken film temperature of diaphragm are necessary
There is certain temperature difference, even if to ensure that temperature continues to rise after diaphragm closed pore cut-out electric current, also has sufficient temp to buffer section
Membrane ruptures do not occur.
Conventional wet lay lithium ion battery isolation film needs the extraction process by organic solvent, this process in process of production
The bottleneck of entire battery isolating film speed of production is often limited, and there are certain use and environmental risks for organic solvent.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of mixtures of battery isolating film
Preparation method, for solving the problems, such as to need in preparation method in the prior art to extract using organic solvent.
The invention solves another question be to provide the problem of a kind of micropore size is larger, porosity is bad.
In order to achieve the above objects and other related objects, the present invention provides a kind of mixture of battery isolating film, described mixed
Close the component that material includes following parts by weight：
100 parts of polyethylene
500~2000 parts of pore-foaming agent
0.1~10 part of antioxidant,
The pore-foaming agent is water-soluble, and the molecular weight of the polyethylene is 1.0 × 105~10.0 × 106, density is
0.940~0.976g/cm3。
Preferably, the molecular weight of the polyethylene is 1.0 × 105~5.0 × 106, most preferably 1.0 × 105~2.0 ×
106。
Preferably, its density of the polyethylene is 0.940~0.966g/cm3, most preferably 0.950~0.966g/cm3。
The polyethylene is a kind of, two kinds or two or more different molecular weights polyethylene mixing.
The pore-foaming agent, can be carboxymethyl starch, acetic starch, hydroxymethyl cellulose, carboxymethyl cellulose, polypropylene
Amide, hydrolyzed polyacrylamide, ethyl cellulose, polymaleic anhydride, polyacrylic acid, polyvinylpyrrolidone, polyvinyl alcohol gather
One or more mixtures in ethylene oxide.
The antioxidant can be 4,4- thiobis (6- tert-butyl-m-cresol), dibutyl hydroxy toluene, phosphite ester,
Tert-butylhydroquinone, β-positive ten caprylate of (3,5- di-tert-butyl-hydroxy phenyl) propionic acid, 1,1,3- tri- (2- methyl -4
Hydroxyl -5- 2-methyl-2-phenylpropanes base) butane, 2- tertiary butyl -6- methylphenols, N, N '-two-betanaphthyl p-phenylenediamine, thio-2 acid pair
Lauryl, phosphorous acid three (nonyl phenyl) ester, one or more compositions in triphenyl phosphite.
The present invention be used to form washing extraction battery isolating film used in pore-foaming agent, it is desirable that its can in any proportion with water
Mixing.
Preferably, the pore-foaming agent is 700~1800 parts, more preferably 800~1600 parts.
Preferably, the antioxidant is 0.5~8 part, more preferably 1~6 part.
Another aspect of the present invention provides the purposes that above-mentioned mixture is used to prepare battery isolating film.
Another aspect of the present invention provides the preparation method of the mixture of above-mentioned battery isolating film, the preparation side
Method includes at least following steps：Mixture is squeezed out, is cast slab, primary to wash, biaxial tension, secondary washing, thermal finalization.
This technique is sent into biaxial orientation stretching machine and is stretched, to form battery diaphragm institute later by using primary washing
The micropore needed, secondary washing are clean water-soluble polymer remaining in isolation film to be removed.
Preferably, the primary washing is using ultrasound washing, and the secondary washing is using ultrasound washing.
Preferably, the temperature once washed is 75~85 DEG C, and the temperature of secondary washing is 75~85 DEG C.
Preferably, the temperature of the curtain coating slab is 75~85 DEG C.
Preferably, the temperature of the thermal finalization is 110~125 DEG C, 10~20min.
Further, the preparation method, which further includes, winds the battery isolating film after thermal finalization.
Another aspect of the present invention provides battery isolating film prepared by above-mentioned preparation method.
Further, the battery isolating film thickness is 5~30 μm, and micropore size is 10~100nm, porosity for 20~
60%.
Further, washing extraction manufacturing process of the present invention refers in particular to procedure below：Mixture is passed through into extruder
It is continuous to squeeze out, it enters in slot die, mixture is expressed into curtain coating chill roll by slot die, is cast at 75~85 DEG C
Become band object, will carry out first wash processing in 75~85 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device,
It is sent into biaxial orientation stretching machine later to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with ultrasound
Second wash processing is carried out in 75~85 DEG C of hot water storgaes of device, it is dry water-soluble polymer remaining in diaphragm to be removed
Only, then 10~20min of thermal finalization minutes at 110~125 DEG C, by film take-up, washing extraction battery isolation is finally obtained
Film.
As described above, mixture of battery isolating film of the present invention and preparation method thereof, has the advantages that：
It is extracted without using organic solvent, Environmental Safety；With relatively low micropore size, the pore-size distribution of uniform concentration,
Good porosity and film-strength.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be clear that the process equipment or device that are not indicated specifically in the following example
Use conventional equipment or device in the art.In addition, it should also be understood that, one or more method and step mentioned in the present invention is simultaneously
Do not repel there may also be other methods step before and after the combination step or may be used also between the step of these are specifically mentioned
To be inserted into other methods step, unless otherwise indicated；It should also be understood that one or more equipment/device mentioned in the present invention it
Between combination connection relation do not repel before and after the unit equipment/device there may also be other equipment/device or at this
Other equipment/device can also be inserted between the two equipment/devices specifically mentioned a bit, unless otherwise indicated.It is moreover, unless another
It is described, the number of various method steps is only the convenient tool for differentiating various method steps rather than the row for limitation various method steps
Row order limits the enforceable range of the present invention, and relativeness is altered or modified, without essence change technology contents
In the case of, when being also considered as the enforceable scope of the present invention.
1. thickness is using Marl, Germany THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILS 1216 according to GB/T6672-2001 plastic films and sheet thickness
Assay method measures.
2. resistance is measured using multimeter on two points of the isolation film at a distance of 10cm, the result used is different measurement
The average value of upper 10 measure of point.
3. transmitance is using Gurley permeating degree testers 4110 according to GB/T1037 plastic films and sheet material moisture vapor
Property test method is measured.
4. percent opening automatically presses water instrument to measure using PMI AAQ-3K-A-1.
5. aperture automatically presses water instrument to measure using PMI AAQ-3K-A-1.
6. puncture intensity inclines skill QJ210A universal testing machines according to the progress of 2679.7 cardboard Punctured Strengths of GB/T using Shanghai
It measures.
7. tensile strength is inclined drawing of the skill QJ210A universal testing machines according to ASTM d882-2002 plastic tabs using Shanghai
Standard method of test is stretched to be measured.
8. shrinking percentage the distance between 2 points L on measuring diaphragm under room temperature (23 DEG C) experimental enviroment0, sample is positioned over
Stainless steel in 120 DEG C of ± 1 DEG C of baking ovens adds, and is taken out after keeping the temperature 1h, when diaphragm is cooled to cold test environment, measuring diaphragm
The distance between upper 2 points L1, shrinking percentage S are calculated as follows：S=(L0-L1)/L0× 100%.
Embodiment 1
It is 0.940g/cm by 100 grams of density3, average molecular weight is 1.0 × 105High molecular weight polyethylene, 0.1 gram of antioxygen
Agent (2,6- di-tert-butyl-4-methy phenol), 500 grams of polyethylene glycol oxides are added in continuous batching coppers, with 50 revs/min of speed
Degree stirring, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 75 DEG C
Become band object, will carry out first wash processing in 75 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
75 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 10 minutes under the conditions of 125 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Embodiment 2
It is 0.976g/cm by 100 grams of density3, average molecular weight is 10.0 × 106High molecular weight polyethylene, 10 grams of antioxygens
Agent (2,6- di-tert-butyl-4-methy phenol), 700 grams of polyethylene glycol oxides are (for the thermoplastic material of white water-soluble, average molecular
Quality 105~106, there are higher order structures, in crystalline state, 65 ± 2 DEG C of fusing point can be completely soluble, and it is organic to dissolve in part
Solvent, solution viscosity are high) it adds in continuous batching coppers, it is stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 85 DEG C
Become band object, will carry out first wash processing in 85 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
85 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 10 minutes under the conditions of 110 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Embodiment 3
It is 0.958g/cm by 100 grams of density3, average molecular weight is 5.0 × 106High molecular weight polyethylene, 5 grams of antioxidant
4,4- thiobis (6- tert-butyl-m-cresols), 1250 grams of polyethylene glycol oxides are (for the thermoplastic material of white water-soluble, average molecular
Quality 105~106, there are higher order structures, in crystalline state, 65 ± 2 DEG C of fusing point can be completely soluble, and it is organic to dissolve in part
Solvent, solution viscosity are high) it adds in continuous batching coppers, it is stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 80 DEG C
Become band object, will carry out first wash processing in 80 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
80 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 15 minutes under the conditions of 120 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Embodiment 4
It is 0.947g/cm by 100 grams of density3, average molecular weight is 2.0 × 106High molecular weight polyethylene, 1.0 grams of antioxygens
Agent 4,4- thiobis (6- tert-butyl-m-cresols), 900 grams of polyethylene glycol oxides are (opposite to divide for the thermoplastic material of white water-soluble
Protonatomic mass 105~106, there are higher order structures, in crystalline state, 65 ± 2 DEG C of fusing point can be completely soluble, and dissolving in part has
Solvent, solution viscosity are high) it adds in continuous batching coppers, it is stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 80 DEG C
Become band object, will carry out first wash processing in 80 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
80 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 15 minutes under the conditions of 120 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Embodiment 5
It is 0.948g/cm by 100 grams of density3, average molecular weight is 5.0 × 106High molecular weight polyethylene, 1.0 grams of antioxygens
Agent 4,4- thiobis (6- tert-butyl-m-cresols), 1000 grams of polyethylene glycol oxides are (opposite to divide for the thermoplastic material of white water-soluble
Protonatomic mass 105~106, there are higher order structures, in crystalline state, 65 ± 2 DEG C of fusing point can be completely soluble, and dissolving in part has
Solvent, solution viscosity are high) it adds in continuous batching coppers, it is stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 80 DEG C
Become band object, will carry out first wash processing in 80 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
80 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 15 minutes under the conditions of 120 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Embodiment 6
It is 0.953g/cm by 100 grams of density3, average molecular weight is 5.0 × 105High molecular weight polyethylene, 200 grams of density
For 0.940g/cm3, average molecular weight is 8.0 × 106High molecular weight polyethylene, 1.0 grams of antioxidant 4,4- thiobis (the tertiary fourths of 6-
Base metacresol), 3600 grams of polyethylene glycol oxides are (for the thermoplastic material of white water-soluble, relative molecular mass 105~106, have
Higher order structures, in crystalline state, 65 ± 2 DEG C of fusing point can be completely soluble, dissolves in part organic solvent, and solution viscosity is high)
It adds in continuous batching coppers, is stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 80 DEG C
Become band object, will carry out first wash processing in 80 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
80 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 15 minutes under the conditions of 120 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Comparative example 1
It is 0.935g/cm by 100 grams of density3, average molecular weight is 5.0 × 104Polyethylene, 0.5 gram of antioxidant, 700
Gram polyethylene glycol oxide is added in continuous batching coppers, is stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 80 DEG C
Become band object, will carry out first wash processing in 80 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
80 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 15 minutes under the conditions of 120 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
Comparative example 2
It is 0.935g/cm by 100 grams of density3, average molecular weight is 10.0 × 106Polyethylene, 1.0 grams of antioxidant,
2500 grams of polyethylene glycol oxides are added in continuous batching coppers, are stirred with 50 revs/min of speed, raw material is uniformly mixed.
Mixture is continuously added to double screw extruder, under the conditions of 180 DEG C, the High molecular weight polyethylene, antioxidant
It is blended, then continuously squeezed out with 200 revs/min of speed by double screw extruder with polyethylene glycol oxide in double screw extruder.Even
Continuous extrudate is entered in slot die, and mixture is expressed into curtain coating chill roll by slot die, is cast under the conditions of 80 DEG C
Become band object, will carry out first wash processing in 80 DEG C of hot water storgaes of the obtained ribbon merging with Vltrasonic device, later
It is sent into biaxial orientation stretching machine to be stretched, to form the micropore needed for battery diaphragm, by the merging of gained film with Vltrasonic device
80 DEG C of hot water storgaes in carry out second wash processing, it is clean remaining water-soluble polymer in diaphragm to be removed, then
Thermal finalization 15 minutes under the conditions of 120 DEG C wind film with 50 ms/min of speed, finally obtain washing extraction battery isolation
Film.Performance such as following table after measured：
The increase with molecular weight is can be seen that from more than experimental result, increased every film strength, shrinking percentage also exists
Constantly reduce.But excessive molecular weight is unfavorable for the trepanning of diaphragm, aperture and porosity are relatively low, and then lead to ventilative value
Also it is relatively high；Although relatively low molecular weight is easier to make diaphragm aperture, but aperture and porosity are relatively large, intensity is relatively low,
Shrinking percentage is also higher, loses practical application advantage.
Above embodiment is in order to illustrate embodiment disclosed by the invention, can not be interpreted as the limit to the present invention
System.In addition, in various modifications listed herein and invention method, composition variation, do not departing from the scope of the present invention
Be obvious for those skilled in the art under the premise of spirit.Although a variety of specific of the present invention is combined
Preferred embodiment has carried out specific description to the present invention, it is to be understood that, the present invention should not be limited only to these specific embodiments.
In fact, various, obviously modification should all include to obtain invention for those skilled in the art as described above
Within the scope of the invention.
Claims (10)
1. a kind of battery isolating film preparation method, which is characterized in that the preparation method includes at least following steps：
Mixture is squeezed out, is cast slab, primary to wash, biaxial tension, secondary washing, thermal finalization.
2. battery isolating film preparation method according to claim 1, it is characterised in that：The primary washing is using ultrasonic water
It washes, the secondary washing is using ultrasound washing.
3. battery isolating film preparation method according to claim 1, it is characterised in that：The preparation method further includes following
Any one or a few in technical characteristic：
A. the temperature once washed is 75~85 DEG C, and the temperature of secondary washing is 75~85 DEG C；
B. the temperature of the curtain coating slab is 75~85 DEG C,
C. the temperature of the thermal finalization is 110~125 DEG C, 10~20min.
4. battery isolating film preparation method according to claim 1, it is characterised in that：The preparation method further includes will be hot
Battery isolating film winding after sizing.
5. battery isolating film preparation method according to claim 1, it is characterised in that：
The mixture includes the component of following parts by weight：
100 parts of polyethylene
500~2000 parts of pore-foaming agent
0.1~10 part of antioxidant,
The pore-foaming agent is water-soluble, and the molecular weight of the polyethylene is 1.0 × 105~10.0 × 106, density for 0.940~
0.976g/cm3。
6. battery isolating film preparation method according to claim 5, it is characterised in that：The pore-foaming agent forms sediment selected from carboxymethyl
Powder, acetic starch, hydroxymethyl cellulose, carboxymethyl cellulose, polyacrylamide, hydrolyzed polyacrylamide, ethyl cellulose gather
Maleic anhydride, polyacrylic acid, polyvinylpyrrolidone, polyvinyl alcohol, one or more mixtures in polyethylene glycol oxide.
7. battery isolating film preparation method according to claim 5, it is characterised in that：The antioxidant is selected from 4,4- sulphur
Dai Shuan (6- tert-butyl-m-cresols), dibutyl hydroxy toluene, phosphite ester, tert-butylhydroquinone, β-(3,5- di-t-butyls-
4- hydroxy phenyls) positive ten caprylate of propionic acid, 1,1,3- tri- (- 4 hydroxyl -5- 2-methyl-2-phenylpropanes base of 2- methyl) butane, 2- tertiary butyls -6-
Methylphenol, N, N '-two-betanaphthyl p-phenylenediamine, the double lauryls of thio-2 acid, phosphorous acid three (nonyl phenyl) ester, phosphorous
One or more compositions in triphenyl phosphate ester.
8. battery isolating film preparation method according to claim 5, it is characterised in that：The pore-foaming agent is 700~1800
Part, more preferably 800~1600 parts.
9. battery isolating film preparation method according to claim 5, it is characterised in that：The antioxidant is 0.5~8
Part, more preferably 1~6 part.
10. the battery isolating film prepared such as claim 1~9 any one of them battery isolating film preparation method.
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|---|---|---|---|
| CN201810022891.9A CN108232091A (en) | 2018-01-10 | 2018-01-10 | Battery isolating film preparation method |
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| CN201810022891.9A CN108232091A (en) | 2018-01-10 | 2018-01-10 | Battery isolating film preparation method |
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Cited By (1)
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Address after: 201399 No. 155 Nanlu Highway, Pudong New Area, Shanghai Applicant after: SHANGHAI ENJIE NEW MATERIAL TECHNOLOGY Co.,Ltd. Address before: 201399 No. 155 Nanlu Highway, Pudong New Area, Shanghai Applicant before: SHANGHAI ENERGY NEW MATERIALS TECHNOLOGY Co.,Ltd. |
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Application publication date: 20180629 |