CN101241984A - A compound diaphragm for lithium ion battery and its making method - Google Patents
A compound diaphragm for lithium ion battery and its making method Download PDFInfo
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- CN101241984A CN101241984A CNA2008100346381A CN200810034638A CN101241984A CN 101241984 A CN101241984 A CN 101241984A CN A2008100346381 A CNA2008100346381 A CN A2008100346381A CN 200810034638 A CN200810034638 A CN 200810034638A CN 101241984 A CN101241984 A CN 101241984A
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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
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- 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 discloses a composite isolating film used by the lithium cell which is the microporous film with B/A/B three-layer structure, wherein layer A is a copolymer film of ethene and other alkene for 1-25(weight percentage); layer B is a copolymer film of propylene and other alkene for 1-5(weight percentage). The originator of the invention adopts the copolymer film of ethene and other alkene, and adopts the copolymer film of propylene and other alkene for a minute quantity in the other layer for preparing a microporous film with B/A/B three-layer sandwich. The copolymer of ethene and other alkene provides a low pore closing temperature, the copolymer film of propylene and minute-quantity other alkene provides high film breaking temperature, high flux strength and adhesive force in the layer A formed by polythene or vinyl copolymer, thereby obtaining an isolating film which has the advantages of low pore closing temperature, high film breaking temperature, high flux strength and high using security.
Description
Technical field
The present invention relates to a kind of lithium ion battery composite isolated film and preparation method thereof technical field.
Background technology
Microporous polyolefin film is the micropore with countless intercommunications, and the aperture is the plastic film of 0.01～10 μ m.Be applied in the lithium battery as a kind of barrier film.Lithium ion battery is made up of both positive and negative polarity, barrier film and electrolyte.Wherein, barrier film connects and separates positive pole and negative material, it is the insulator of electronics, but allow ion to pass through, the quality of its performance is determining the interfacial structure and the internal resistance of battery, and then affect the key characteristics such as capacity, cyclicity, charging and discharging currents density of battery, so the quality of barrier film performance plays an important role for the combination property that improves battery.
Fail safe is the index that the polyolefin micropore barrier film at first will be considered when using.The Joule heat that forms owing to battery short circuit makes internal temperature of battery raise, the battery diaphragm aperture dwindles and makes resistance increase temperature low more, in other words, the temperature that further melts and micropore is disappeared is low more, just can under lower temperature, stop ion to pass through, can prevent like this internal temperature of battery raise the fusing point reach lithium or electrolyte point of ignition and cause the generation of fire incident, thereby reach purpose of safety.Thereby the temperature that requires micropore to disappear is that lower good for closed pore temperature.When battery isolating film makes micropore disappear because of fusing after, in case internal temperature of battery further raises, the barrier film melt viscosity reduces, reach a certain temperature film rupture then takes place, if barrier film too early breaks, electrode is contact directly, and this is breakneck, and it is necessary therefore making barrier film keep its shape more than melt temperature.The film rupture temperature is high more, then stops the time of ion circulation also long more, thereby very high security performance is just arranged.The difference of film rupture temperature and closed pore temperature is the decisive factor of decision battery security, and barrier material is a key factor that influences the barrier film fail safe.
Polyethene microporous membrane melts between 120～130 ℃, and its characteristics of closing in early days make the increase be easy to suppress the associated temperature of closing with micropore, but in single barrier film of being made by polyethylene, its film rupture temperature is also low, thereby can not think that it is safe.Patent CN99804321 adopts HDPE and atoleine blend, 131.9 ℃ of gained microporous membrane closed pore temperatures, and 133.1 ℃ of film rupture temperature, the fail safe of battery is relatively poor.Recently also adopt laminated film but not the homogenous material film solves the safety issue of barrier film.The patent that Tonen, Asahi-Kasei, Hoechst company have applied for two-layer PE/PP and three layers of PP/PE/PP microporous barrier.Patent CN92109189 has provided the microporous barrier that is made of polyethylene and polypropylene, and its closed pore temperature is 135～140 ℃, and the temperature of film rupture is near 170 ℃, and both differ 30～35 ℃, have very high security performance.But these laminated films all adopt the fusion drawn method to make.The fusion drawn method is earlier with crystalline polymer extrusion molding film forming under the condition that improves molten polymer stress, make film under no tension force or low-tension, obtain the necessary crystallization structure then through annealing, after carry out the network structure that longitudinal stretching produces a kind of slit-shaped space.Therefore there are shortcomings such as aperture and the difficult control of porosity in these laminated films, and owing to only carry out longitudinal stretching, the film transverse strength is relatively poor.
Asahi-Kasei, the Mitsui Chemical of Japan and relevant patent JP2004323820 (2004), the U.S.Patent 6245272 (2001) of Tonen company have reported employing thermally induced phase separation production microporous barrier.Thermally induced phase separation (TIPS) is at high temperature as in the double screw extruder polymer (as high density polyethylene) to be dissolved in higher boiling point, solvent (the diluent of low volatility, as mineral oil), form uniform solution, back through port mould extrusion molding sheet, quenching cooling on chill roll, causing solution to produce is separated, obtain having the sheet of phase separation structure, the back is adopted the biaxial tension equipment while or is distributed and carries out in length and breadth to stretching, acquisition has the film of phase separation structure, wherein before or after biaxial tension, adopt volatile organic solvent (extractant) that diluent is extracted, thereby obtain the high molecule micropore of certain planform.Adopt this kind method, the microporous barrier of suitability for industrialized production is HDPE individual layer barrier film basically at present, has shortcomings such as fail safe is not enough, puncture resistance is not enough.
Adopt thermally induced phase separation to produce multilayer microporous film, if pure employing PE and PP layer are directly compound, on the one hand because both consistency problems, easily cause the plural layers combined strength bination on the low side, on the other hand because after PP and the mixing diluents, diluent destroys the crystallizing power of PP own, the mixed system melt strength obviously reduces, be difficult to carry out technological operations such as follow-up stretching, therefore will successfully adopt thermally induced phase separation production MULTILAYER COMPOSITE microporous barrier, must solve above two problems.
Summary of the invention
Purpose of the present invention just is to solve a prior art difficult problem, and a kind of lithium ion battery MULTILAYER COMPOSITE barrier film is provided, and this barrier film combined strength bination obviously improves than existing barrier film.
Another object of the present invention provides the preparation method of above-mentioned composite multi-layer composite isolated film.
For achieving the above object, the concrete technical scheme taked of the present invention is as follows:
A kind of lithium battery composite isolated film is the microporous barrier of B/A/B three-decker, and wherein the A layer is the co-polymer membrane of other alkene of ethene and 1～25% (percentage by weight); The B layer is the co-polymer membrane of other alkene of propylene and 1～5% (percentage by weight).
High fused mass strength compound isolating film of the present invention, B/A/B threeply degree ratio be preferably 1: 3: 1～and 2: 1: 2, gross thickness is preferably 20～50um.
Above-mentioned A layer raw material requires fusing point to be lower than 135 ℃, provides low closed pore temperature to microporous barrier; B layer ingredient requirement fusing point is higher than 170 ℃, provide high broken film temperature, high melt strength and and the A layer between bonding force.
Consider the isolation film strength, above-mentioned polyethylene, the preferred high density polyethylene (HDPE) of A layer raw material, weight average molecular weight is 1 * 10
4～1 * 10
6, more preferably weight average molecular weight is 5 * 10
4～3 * 10
5High density polyethylene (HDPE).
The above-mentioned ethene and the copolymer of other alkene, preferred scheme are meant the copolymer of alkene such as ethene and propylene, butylene, octene, hexene.
The above-mentioned propylene and the copolymer of other alkene, preferred scheme is that this copolymer has isotactic configuration, high-crystallinity, degree of crystallinity reaches 80%～85%; Other alkene in the copolymer are preferably ethene, and the weight content of ethene is preferably 0.1～7%.
The preparation method of high fused mass strength compound isolating film of the present invention adopts the production of thermal induction phase disengagement method.A layer and B layer are extruded respectively, adopted multi-layer co-extruded method can form B/A/B three-decker micropore barrier film.Be about to used polymer of A layer or copolymer and diluent blend in extruder and extrude, polymer that the B layer is used or copolymer and diluent are extruded in another extruder, and both extrudates is compound in die head, form even sheet after the coextrusion quenching.
The preparation method of high fused mass strength compound isolating film, concrete steps are as follows:
A, raw material blend in extruder that the A layer is used are earlier extruded, and the used raw material of B layer extruded in another extruder, and be then that two kinds of extrudates are compound in die head, the even sheet of the B/A/B three-decker that forms after the coextrusion quenching;
B, sheet is made film through biaxial tension;
C, step b gained film is washed away solvent with washing agent, dry then;
D, dried film thermal finalization is handled.
Among the above-mentioned step a, the raw materials used diluent that also comprises of B layer.
The content range of diluent is preferably 40～90% of the raw materials used total weight of A layer among the step a, and content is too little, and the film porosity that obtains is less than normal, and content is too many, and processing and forming has certain difficulty.
Used diluent is at high temperature all to have excellent compatibility with used polymer or the copolymer of A layer or B layer, and the solvent of higher boiling point, difficult volatilization, can be various alkane, paraffin or ester type compound etc.
Said alkane is preferably nonane or alkane how.
Paraffin can be that solid paraffin also can be an atoleine, preferred liquid paraffin, the more preferably atoleine of viscosity between 70～120cst.The viscosity of used paraffin is too high, is difficult for being extracted the agent extraction, and viscosity is too low, and casting sheet sheet intensity is too low, and in this scope, those skilled in the art can experimentize in real work and choose.
Ester type compound pref-erable dioctyl phthalate DOP, dibutyl phthalate DBP or stearate.
In addition, in the used raw material of above-mentioned A layer or B layer, can also add some have improvement to film performance auxiliary agent, as nucleator, antioxidant etc., choose and input amount those skilled in the art of auxiliary agent can select to add with the behavioral illustrations of auxiliary agent as required.
Among the above-mentioned step c, selected washing agent should have good compatibility with used diluent among the step a, but and incompatible between the used vistanex of A layer or B layer.Used washing agent can be a kind of in alkane, chlorohydrocarbon, fluorinated hydrocarbons, the ketone.
In the above-mentioned steps d, in order to prevent the film contraction distortion, and, must carry out thermal finalization and handle in order to improve microcellular structure in the film.The thermal finalization processing is meant under 100～130 ℃ carries out cross directional stretch with film, 1～1.5 times of stretching ratio, 10～100 seconds processing times of typing.
Beneficial effect of the present invention:
The present inventor does not adopt directly compound conventional method of PE and PP layer, but one deck adopts the co-polymer membrane of ethene and other alkene, and another layer adopts the co-polymer membrane of propylene and other alkene of minute quantity, produces the microporous barrier of B/A/B three-decker.The copolymer of ethene and other alkene provides low closed pore temperature, the co-polymer membrane of propylene and other alkene of minute quantity provide high broken film temperature, high fondant-strength and and the A layer that constitutes of polyethylene or ethylene copolymer between bonding force, thereby obtained to have low closed pore temperature, the barrier film of high broken film temperature, high fondant-strength, height safety in utilization.
On the other hand, because the diluent that the present invention adopts suitable polymers or copolymer weight and adapts, solved the interlayer consistency problem, do not have cracking phenomena between plural layers, the suitable dilution agent gets involved, and does not destroy the crystallizing power of polymer film itself, the mixed system melt strength is also fine, therefore can adopt thermally induced phase separation to produce composite micro porous film smoothly, follow-up stretching is convenient, and is easy to operate.
Embodiment
Following embodiment is to further explanation of the present invention and explanation, and the present invention is not constituted any limitation.
Embodiment 1:
High density polyethylene (HDPE) (weight average molecular weight 2.7 * 10 with 30% (weight)
5, 133 ℃ of fusing points) drop among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The Ethylene-Propylene Block Copolymer of 30% (weight) (degree of crystallinity 85%, fusing point＞170 ℃, ethylene contents 7%) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A and solution B mixed in T pattern head to carry out B/A/B three-layer co-extruded, B/A/B threeply degree is than 3: 4: 3, cooling casting sheet on slab roller obtains the sheet of the about 1.0mm of thickness.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 7 * 7 times of stretching ratios, 122 ℃ of draft temperatures.Adopt the atoleine in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Embodiment 2:
High density polyethylene (HDPE) (weight average molecular weight 2.7 * 10 with 30% (weight)
5, 133 ℃ of fusing points) drop among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The propylene-ethylene block copolymer of 30% (weight) (degree of crystallinity 85%, fusing point＞170 ℃, ethylene contents 3%) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A and solution B mixed in T pattern head to carry out B/A/B three-layer co-extruded, B/A/B threeply degree is than 1: 1: 2, cooling casting sheet on slab roller obtains the sheet of the about 0.5mm of thickness.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 5 * 5 times of stretching ratios, 122 ℃ of draft temperatures.Adopt the atoleine in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Embodiment 3:
High density polyethylene (HDPE) (weight average molecular weight 2.7 * 10 with 25% (weight)
5, 133 ℃ of fusing points), the ethene and the octene copolymer (octene content 15% of 5% (weight), MFI 1.0g/10min) drops among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The propylene-ethylene block copolymer of 30% (weight) (degree of crystallinity 85%, fusing point＞170 ℃, ethylene contents 7%) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A and solution B mixed in T pattern head to carry out B/A/B three-layer co-extruded, B/A/B threeply degree is than 1: 2.5: 1, cooling casting sheet on slab roller obtains the sheet of the about 0.7mm of thickness.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 5 * 7 times of stretching ratios, 122 ℃ of draft temperatures.Adopt the atoleine in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Embodiment 4:
High density polyethylene (HDPE) (weight average molecular weight 2.7 * 10 with 25% (weight)
5, 133 ℃ of fusing points), the low density polyethylene (LDPE) (weight average molecular weight 2.9 * 10 of 5% (weight)
5, 120 ℃ of fusing points) drop among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The propylene-ethylene block copolymer of 30% (weight) (degree of crystallinity 85%, fusing point＞170 ℃, ethylene contents 7%) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A and solution B mixed in T pattern head to carry out B/A/B three-layer co-extruded, B/A/B threeply degree is than 1: 2: 2, cooling casting sheet on slab roller obtains the sheet of thickness 1.0mm.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 7 * 7 times of stretching ratios, 122 ℃ of draft temperatures.Adopt the atoleine in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Embodiment 5
Copolymer (weight average molecular weight 2.7 * 10 with the ethene and the propylene (propylene weight content is 5% in the copolymer) of 35% (weight)
5, 133 ℃ of fusing points), drop among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 65% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The propylene-ethylene block copolymer of 30% (weight) (degree of crystallinity 85%, fusing point＞170 ℃, ethylene contents 7%) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the dioctyl phthalate of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A and solution B mixed in T pattern head to carry out B/A/B three-layer co-extruded, B/A/B be layer thickness than 1: 1: 1, cooling casting sheet on slab roller obtains the sheet of thickness 1.0mm.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 7 * 7 times of stretching ratios, 100 ℃ of draft temperatures.Adopt atoleine and dioctyl phthalate in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Comparative example 1:
High density polyethylene (HDPE) (weight average molecular weight 2.7 * 10 with 30% (weight)
5, 133 ℃ of fusing points) drop among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The polypropylene (167 ℃ of degree of crystallinity 60%, fusing points) of 30% (weight) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A mixed in T pattern head with solution B carry out the two-layer co-extrusion of B/A, the B/A two layers of thickness is than 1: 1, cooling casting sheet on slab roller obtains the sheet of thickness 1.0mm.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 7 * 7 times of stretching ratios, 122 ℃ of draft temperatures.Adopt the atoleine in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Comparative example 2:
High density polyethylene (HDPE) (weight average molecular weight 2.7 * 10 with 30% (weight)
5, 133 ℃ of fusing points) drop among the double screw extruder A (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution A under 200 ℃, 150 rev/mins condition; The polypropylene (170 ℃ of degree of crystallinity 70%, fusing points) of 30% (weight) is dropped among the double screw extruder B (diameter 78mm, L/D=50, strong mixed milling type), with the atoleine (kinematic viscosity 90cst/40 ℃) of measuring pump by side direction spout adding 70% (weight), melting mixing is modulated into solution B under 230 ℃, 150 rev/mins condition; After solution A mixed in T pattern head with solution B carry out the two-layer co-extrusion of B/A, the B/A two layers of thickness is than 1: 1, cooling casting sheet on slab roller obtains the sheet of thickness 1.0mm.Sheet is carried out the horizontal substep biaxial tension in vertical earlier back, 7 * 7 times of stretching ratios, 122 ℃ of draft temperatures.Adopt the atoleine in the butanone extraction film afterwards, dry back is at 125 ℃ of processing of finalizing the design, 1.4 times of stretching ratios.
Each embodiment and comparative example comparative result see Table 1.
Table 1
| Performance index | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 | Comparative example 2 |
| Thickness um | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Porosity % | 45 | 45 | 45 | 45 | 45 | 45 | 45 |
| Air permeability sec/100ml | 435 | 485 | 455 | 465 | 450 | 750 | 770 |
| Closed pore temperature ℃ | 133 | 134 | 133 | 133 | 130 | 133 | 133 |
| Broken film temperature ℃ | 178 | 180 | 176 | 175 | 175 | 168 | 170 |
As seen each embodiment gained composite diaphragm and comparative example 1 compared with 2 prepared composite diaphragms, after introducing the copolymer of high-crystallinity propylene and other alkene, because the film melt strength improves and the MULTILAYER COMPOSITE boundary strength improves, MULTILAYER COMPOSITE polyolefin or ethylene copolymer micropore barrier film broken film temperature obviously improve, usage safety performance obviously improves, and air permeability obviously reduces.Compare with comparative example 2, the high-crystallinity propylene is compared metallocene linear-low density polyethylene with the copolymer of other alkene, film strength improves on the one hand, to improve effect more obvious in two bed boundarys on the other hand, therefore the broken film temperature of film also increases, and the air permeability of film obviously reduces.
Adopt the HDPE individual layer barrier film of thermally induced phase separation production to compare with existing industrialization the performance test results of the prepared composite diaphragm of the embodiment of the invention, near under the situation, broken film temperature obviously improves in the permeability index, and battery security improves.
Claims (8)
1, a kind of lithium battery composite isolated film is the microporous barrier of B/A/B three-decker, and wherein the A layer is the co-polymer membrane of other alkene of ethene and 1～25% (percentage by weight); The B layer is the co-polymer membrane of other alkene of propylene and 1～5% (percentage by weight).
2, lithium battery composite isolated film as claimed in claim 1 is characterized in that: B/A/B threeply degree ratio is 1: 2: 1～2: 1: 2, and gross thickness is 20～50um.
3, lithium battery composite isolated film as claimed in claim 1 is characterized in that: A layer raw material fusing point is lower than 135 ℃, and B layer raw material fusing point is higher than 170 ℃.
4, lithium battery composite isolated film as claimed in claim 1 is characterized in that: A layer raw material is that weight average molecular weight is 5 * 10
4～3 * 10
5High density polyethylene (HDPE).
5, lithium battery composite isolated film as claimed in claim 1, it is characterized in that: the copolymer of propylene and other alkene has isotactic configuration, high-crystallinity, and degree of crystallinity reaches 80%～85%.
6, lithium battery composite isolated film as claimed in claim 1 is characterized in that: other alkene in the copolymer of propylene and other alkene are ethene, and the weight content of ethene is 0.1～7%.
7, the described lithium battery of claim 1～6 preparation method of composite isolated film, concrete steps are as follows:
A, raw material blend in extruder that the A layer is used are earlier extruded, and the used raw material of B layer extruded in another extruder, and be then that two kinds of extrudates are compound in die head, the even sheet of the B/A/B three-decker that forms after the coextrusion quenching;
B, sheet is made film through biaxial tension;
C, step b gained film is washed away solvent with washing agent, dry then;
D, dried film thermal finalization is handled.
8, lithium battery as claimed in claim 7 is characterized in that with the preparation method of composite isolated film: among the above-mentioned step a, the B layer is raw materials used also to comprise diluent nonane or alkane how, and content range is 40～90% of the raw materials used total weight of A layer.
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