CN102064301A - Method for manufacturing porous multilayer composite diaphragm for lithium battery and diaphragm - Google Patents
Method for manufacturing porous multilayer composite diaphragm for lithium battery and diaphragm Download PDFInfo
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- CN102064301A CN102064301A CN2010106050326A CN201010605032A CN102064301A CN 102064301 A CN102064301 A CN 102064301A CN 2010106050326 A CN2010106050326 A CN 2010106050326A CN 201010605032 A CN201010605032 A CN 201010605032A CN 102064301 A CN102064301 A CN 102064301A
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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 method for manufacturing a porous multilayer composite diaphragm for a lithium battery and a diaphragm manufactured by the same. In the method, polyethylene mixed with solvent and heat-resistant resin mixed with the solvent are extruded by using a multilayer die head of a double-screw extruder, and the extruded products are subjected to chill casting, two-way stretch, washing, drying and heat setting to manufacture the porous multilayer composite diaphragm. An integral structure of the manufactured diaphragm comprises a polyethylene layer and a heat-resistant resin layer, has low closed-cell temperature given by the polyethylene and high diaphragm breaking temperature given by the heat-resistant resin layer simultaneously. Simultaneously, the addition of the heat-resistant resin layer reduces the heat contractibility of the multilayer diaphragm and improves the puncture strength of the multilayer diaphragm, so the multilayer diaphragm has more excellent performance.
Description
Technical field
Patent of the present invention relates to its preparation method of a kind of lithium battery with the porous multilayer composite diaphragm, and the barrier film that uses this method preparation.
Background technology
But the chargeable lithium ion secondary cell has advantages such as high working voltage, high-energy-density, long circulation life, memory-less effect, pollution-free characteristic and fast charging and discharging, has become the focus of novel power supply technical research.
Common lithium rechargeable battery is made up of lithia positive electrode, carbon negative pole material, electrolyte, barrier film and battery case packaging material.Wherein, barrier film is the important component part of lithium rechargeable battery, rises to prevent to be in contact with one another between the both positive and negative polarity active material and cause short circuit in battery, and it is non-electronic conductor, but but allow lithium ion to pass through, the effect of ion transportation passage is provided in charge and discharge process.The quality of membrane properties has determined the interfacial structure, internal resistance of battery etc., and then directly influences the characteristics such as capacity, cycle-index and security performance of battery, and the barrier film of excellent performance has important effect to the combination property that improves battery.The mechanical strength of barrier film, heat-shrinkable and thermal endurance also are key factors that influences its application, and high puncture intensity, low thermal shrinkage behavior and high broken film temperature are the key characters of excellent lithium battery diaphragm.
The lithium battery secondary cell has the energy density advantages of higher, but has the potential hazard that sets off an explosion because of short circuit, thereby the fail safe of barrier film is very important.High-quality lithium battery diaphragm should also should have suitable closed pore temperature and high broken film temperature outside the requirement of satisfying mechanical strength, affinity, percent thermal shrinkage and the internal resistance etc. of basic lithium battery to it.
Generally believe that suitable closed pore temperature is 120-140 ℃, closed pore temperature is too low, and then little temperature rises and just upsets ion flow, causes battery performance sharply to descend; Closed pore temperature is too high, does not have the effect of fuse again, causes the danger of lithium battery blast on fire easily.The temperature of lithium battery interior may also can continue to rise behind the closed pore, reaches the uniform temperature metacneme and breaks, and both positive and negative polarity will directly contact and short circuit, blasts, and this is unallowed.In order to guarantee the safe handling of lithium battery, preferably have the diaphragm material of suitable closed pore temperature and high broken film temperature, and the difference of closed pore temperature and broken film temperature is the bigger the better.
Vistanex has good insulating properties, the wide temperature scope of application, outstanding physical property and solvent resistance, is suitable as very much the production septum for lithium ion battery.
The closed pore temperature of polyalkene diaphragm is comparatively suitable, yet its broken film temperature is lower, and the difference of broken film temperature and closed pore temperature is less, as lithium ion battery separator, has potential safety hazard with it.Closed pore temperature as the PE barrier film is 130-140 ℃, and is proper, but the poor heat resistance of PE barrier film, broken film temperature is not higher than 150 ℃, and promptly its closed pore temperature and broken film temperature differ maximum and be no more than 20 ℃, and be quite dangerous.
The broken film temperature of heat-resistant resin barrier film is higher, yet its closed pore temperature is higher again, does not reach safety requirements equally.As the pp barrier film, its broken film temperature is higher, greater than 170 ℃; Yet its closed pore temperature is also very high, is more than 150 ℃, does not reach safety requirements equally.
If the comprehensive advantage of polyethylene barrier film and heat-resistant resin barrier film, prepare a kind of polyethylene and heat-resistant resin porous multilayer laminated film, the advantage that then can have above-mentioned two kinds of barrier films simultaneously, both had lower closed pore temperature, have higher broken film temperature again, thereby make barrier film have the excellent safety energy.
Summary of the invention
The object of the present invention is to provide the preparation method of a kind of lithium ion battery with the porous multilayer composite diaphragm, and the lithium ion battery porous multilayer composite diaphragm that passes through method for preparing.
The lithium ion battery of the present invention preparation method of porous membrane may further comprise the steps:
A, polyethylene is become uniform solution with high boiling small molecular weight compounds solvent melting mixing respectively with heat-resistant resin on screw extruder separately;
B, respectively described solution is gone out via the multilayer film coextrusion head, and the multilayer sheet is cast in cooling on slab roller with double screw extruder;
C, with the preheating of multilayer sheet after film is made in biaxial tension;
Film process sink cleaning solvent after d, the stretching, drying, thermal finalization makes.
The lithium battery porous multilayer composite diaphragm that uses said method to make comprises one deck porous polyethylene layer and is close to porous heat-resistant resin bed on the porous polyethylene layer more than one deck.
Because polyethylene layer has lower closed pore temperature, the heat-resistant resin layer has higher broken film temperature again, answers this above-mentioned porous multilayer composite diaphragm, has lower closed pore temperature and higher broken film temperature simultaneously, having good fail safe, is a kind of desirable lithium ion battery porous membrane.The adding of heat-resistant resin layer simultaneously can reduce the heat-shrinkable of laminated diaphragm, has improved the puncture intensity of laminated diaphragm, makes barrier film have excellent more performance.
Simultaneously, the aperture on its each thin layer makes by washing the solvent that evenly is miscible in the thin layer, and the aperture and the porosity of prepared barrier film are even, and the barrier film shrinkage rates of being heated is less, and closed circuit protection is desirable during as battery diaphragm.
Described heat-resistant resin can be Nomex, polyphenylene oxide, polyarylate, polyacrylonitrile, PETG, Merlon, poly(4-methyl-1-pentene), polytetrafluoroethylene and Kynoar etc.
The high boiling small molecular weight compounds solvent that described polyethylene layer is used can be a kind of in the mineral oil such as nonane, hendecane, naphthalane, atoleine, or wherein several mixtures.Described solvent accounts for the 40-90% of polyethylene and solvent total weight.
The mixture of one or more in one or more that the high boiling small molecular weight compounds solvent of described heat-resistant resin layer usefulness can be above-mentioned mineral oil and soybean oil, peanut oil and the castor-oil plant wet goods vegetable oil.Solvent accounts for the 40-90% of heat-resistant resin and solvent total weight.
Among the step b, the extrusion temperature of polyethylene and solvent is 160-250 ℃, and the extrusion temperature of heat-resistant resin layer and solvent is 180-280 ℃; The diaphragm of coextrusion passes through cold water roller cool to room temperature with the cooldown rate greater than 40 ℃/min, and making thickness is 0.5-2mm, and film is wide to be 0.2-1m.
The film biaxial tension is the stretching of longitudinal and transverse two directions among the step c, and total multiplying power that stretches is 10-50, and draft temperature is 100-150 ℃.
The extractant of the described cleaning solvent of steps d can be easy volatile solvent such as cyclohexane, pentane, hexane, heptane, halogenated hydrocarbons and ethers.Dry run with air blast washing agent is dried up or vacuum is drained.Heat setting temperature is 100-130 ℃, heat treatment time 10-120s.
Described barrier film be 30-80% with the porosity, gas permeability is 200-800s/100ml, pore size is 0.01-0.1 μ m, closed pore temperature is 130-140 ℃, broken film temperature is greater than 170 ℃, for good.
The thickness of described polyethylene layer or heat-resistant resin layer is being good with 5-25 μ m.
Embodiment
Embodiment 1
High density polyethylene (HDPE) (HDPE, M with 20% percentage by weight
w=3.0 * 10
5134 ℃ of fusing points) add wherein double screw extruder (diameter 58mm, L/D=48), paraffin oil with 80% percentage by weight joins double screw extruder by the side direction feeding again, by in double screw extruder, making polyethylene fusion and mixed atoleine under 220 ℃ and 200rpm condition, form polyethylene solution, the solution that obtains is extruded from the sandwich layer of three layers of die head by measuring pump, thickness 200 μ m.
Simultaneously with Kynoar (PVDF, the M of 20% percentage by weight
w=3.7 * 10
5174 ℃ of fusing points) add another double screw extruder (diameter 58mm, L/D=48), again the castor oil of 80% percentage by weight and the mixture of paraffin oil (weight ratio is 1:1) are joined double screw extruder by the side direction feeding, by in double screw extruder, making PVDF fusion and mixed castor oil and atoleine under 230 ℃ and 200rpm condition, form homogeneous solution, the solution that obtains is extruded from two top layers of three layers of die head by measuring pump, every layer thickness 200 μ m.
The diaphragm that goes out by the die head composite co-extruding is cooled to room temperature with the cooldown rate greater than 40 ℃/min by the cold water roller, make the gel threeply sheet film that thickness is about 600 μ m, diaphragm is then 5 * 5 times of 120 ℃ of following biaxial tensiones, film after the stretching obtains 25 μ m porous multilayer composite diaphragms by washing (hexane wash), dry and 120 ℃ of following thermal finalizations.The performance of barrier film sees Table 1.
Embodiment 2
High density polyethylene (HDPE) (HDPE, M with 20% percentage by weight
w=3.0 * 10
5134 ℃ of fusing points) add wherein double screw extruder (diameter 58mm, L/D=48), paraffin oil with 80% percentage by weight joins double screw extruder by the side direction feeding again, by in double screw extruder, making polyethylene fusion and mixed atoleine under 220 ℃ and 200rpm condition, form polyethylene solution, the solution that obtains is extruded from the sandwich layer of three layers of die head by measuring pump, thickness 200 μ m.
Simultaneously with poly(4-methyl-1-pentene) (TPX, the M of 20% percentage by weight
w=4.5 * 10
5240 ℃ of fusing points) add another double screw extruder (diameter 58mm, L/D=48), again the castor oil of 80% percentage by weight and the mixture of paraffin oil (weight ratio is 1:1) are joined double screw extruder by the side direction feeding, by in double screw extruder, making TPX blend fusion and mixed castor oil and atoleine under 260 ℃ and 200rpm condition, form homogeneous solution, the solution that obtains is extruded from two top layers of three layers of die head by measuring pump, every layer thickness 200 μ m.
The diaphragm that goes out by the die head composite co-extruding is cooled to room temperature with the cooldown rate greater than 40 ℃/min by the cold water roller, make the gel threeply sheet film that thickness is about 600 μ m, diaphragm is then 5 * 5 times of 120 ℃ of following biaxial tensiones, film after the stretching obtains 25 μ m porous multilayer composite diaphragms by washing (hexane wash), dry and 130 ℃ of following thermal finalizations.The performance of barrier film sees Table 1.
Embodiment 3
High density polyethylene (HDPE) (HDPE, M with 20% percentage by weight
w=3.0 * 10
5134 ℃ of fusing points) add wherein double screw extruder (diameter 58mm, L/D=48), paraffin oil with 80% percentage by weight joins double screw extruder by the side direction feeding again, by in double screw extruder, making polyethylene fusion and mixed atoleine under 220 ℃ and 200rpm condition, form polyethylene solution, the solution that obtains is extruded from the sandwich layer of three layers of die head by measuring pump, thickness 200 μ m.
Simultaneously with poly(4-methyl-1-pentene) (TPX, the M of 20% percentage by weight
w=4.5 * 10
5240 ℃ of fusing points) add another double screw extruder (diameter 58mm, L/D=48), again the castor oil of 80% percentage by weight and the mixture of paraffin oil (weight ratio is 1:1) are joined double screw extruder by the side direction feeding, by in double screw extruder, making TPX blend fusion and mixed castor oil and atoleine under 260 ℃ and 200rpm condition, form homogeneous solution, the solution that obtains is extruded from one of them top layer of three layers of die head by measuring pump, thickness 200 μ m.
Again with Kynoar (PVDF, the M of 20% percentage by weight
w=3.7 * 10
5174 ℃ of fusing points) add another double screw extruder (diameter 58mm, L/D=48), the castor oil of 80% percentage by weight and the mixture of paraffin oil (weight ratio is 1:1) are joined double screw extruder by the side direction feeding, by in double screw extruder, making PVDF fusion and mixed castor oil and atoleine under 230 ℃ and 200rpm condition, form homogeneous solution, the solution that obtains is extruded from another top layer of three layers of die head by measuring pump, thickness 200 μ m.
The diaphragm that goes out by the die head composite co-extruding is cooled to room temperature with the cooldown rate greater than 40 ℃/min by the cold water roller, make the gel threeply sheet film that thickness is about 600 μ m, diaphragm is then 5 * 5 times of 120 ℃ of following biaxial tensiones, film after the stretching obtains 25 μ m porous multilayer composite diaphragms by washing (hexane wash), dry and 120 ℃ of following thermal finalizations.The performance of barrier film sees Table 1.
Embodiment 4
High density polyethylene (HDPE) (HDPE, M with 30% percentage by weight
w=3.0 * 10
5134 ℃ of fusing points) add wherein double screw extruder (diameter 58mm, L/D=48), paraffin oil (kinematic viscosity 95cst/40 ℃) with 70% percentage by weight joins double screw extruder by the side direction feeding again, by in double screw extruder, making polyethylene fusion and mixed atoleine under 220 ℃ and 200rpm condition, form polyethylene solution, the solution that obtains is extruded from the sandwich layer of three layers of die head by measuring pump, thickness 200 μ m.
Simultaneously with polypropylene (PP, M
w=4.8 * 10
5168 ℃ of fusing points) add another double screw extruder (diameter 58mm, L/D=48), again the castor oil of 70% percentage by weight and the mixture (weight ratio is 1:1) of paraffin oil (kinematic viscosity 95cst/40 ℃) are joined double screw extruder by the side direction feeding, by in double screw extruder, making PP fusion and mixed castor oil and atoleine under 230 ℃ and 200rpm condition, form homogeneous solution, the solution that obtains is extruded from two top layers of three layers of die head by measuring pump, every layer thickness 200 μ m.
The diaphragm that goes out by the die head composite co-extruding is cooled to room temperature with the cooldown rate greater than 40 ℃/min by the cold water roller, make the gel threeply sheet film that thickness is about 600 μ m, diaphragm is then 5 * 5 times of 120 ℃ of following biaxial tensiones, film after the stretching obtains 25 μ m porous multilayer composite diaphragms by washing (hexane wash), dry (air-dry) with 120 ℃ of following thermal finalizations 20 seconds.The performance of barrier film sees Table 1.
Claims (10)
1. lithium battery comprises the steps: with the preparation method of porous multilayer composite diaphragm
A. polyethylene, heat-resistant resin are become uniform solution with high boiling small molecular weight compounds solvent melting mixing respectively on screw extruder separately;
B. respectively described solution is gone out via the multilayer film coextrusion head with double screw extruder, and the multilayer sheet is cast in cooling on slab roller;
C. with the preheating of multilayer sheet after film is made in biaxial tension;
D. the film after stretching washs high boiling small molecular weight compounds solvent through in the sink with extractant, drying, and thermal finalization makes.
2. the lithium ion battery according to claim 1 preparation method of porous multilayer composite diaphragm, it is characterized in that: the heat-resistant resin described in the step a is Nomex, polyphenylene oxide, polyarylate, polyacrylonitrile, PETG, Merlon, poly(4-methyl-1-pentene), one or more in polytetrafluoroethylene, the Kynoar.
3. the lithium ion battery according to claim 1 preparation method of porous multilayer composite diaphragm, it is characterized in that: the polyethylene layer solvent for use is one or several in nonane, hendecane, naphthalane, the atoleine; Heat-resistant resin layer solvent for use is one or more the mixture in one or more and soybean oil, peanut oil and the castor oil in nonane, hendecane, naphthalane, the atoleine.
4. the lithium ion battery according to claim 1 preparation method of porous multilayer composite diaphragm, it is characterized in that: among the step b, the extrusion temperature of polyethylene and solvent is 160-250 ℃, and the extrusion temperature of heat-resistant resin layer and solvent is 180-280 ℃; The diaphragm of coextrusion passes through cold water roller cool to room temperature with the cooldown rate greater than 40 ℃/min, and making thickness is 0.5-2mm, and width is the sheet of 0.2-1m.
5. the manufacture method of porous multilayer composite diaphragm according to claim 1 is characterized in that: the film biaxial tension is the stretching of longitudinal and transverse two directions among the step c, and total multiplying power that stretches is 10-50, and draft temperature is 100-150 ℃.
6. the manufacture method of porous multilayer composite diaphragm according to claim 1 is characterized in that: the extractant of the described cleaning solvent of steps d is easy volatile solvent such as cyclohexane, pentane, hexane, heptane, halogenated hydrocarbons and ethers; Heat setting temperature is 100-130 ℃, heat treatment time 10-120s.
7. the lithium battery porous multilayer composite diaphragm that makes according to the described preparation method of claim 1-6 is characterized in that: comprise one deck porous polyethylene layer and be close to porous heat-resistant resin bed on the porous polyethylene layer more than one deck.
8. according to claims 7 described lithium battery porous multilayer composite diaphragms, it is characterized in that: described porous multilayer composite diaphragm comprises three layers, and its sandwich layer is a polyethylene layer, and its upper and lower top layer is identical or different heat-resistant resin layer.
9. according to claims 7 described lithium battery porous multilayer composite diaphragms, it is characterized in that: the porosity of described barrier film is 30-80%, and gas permeability is 200-800s/100ml, and pore size is 0.01-0.1 μ m, closed pore temperature is 130-140 ℃, and broken film temperature is greater than 170 ℃.
10. according to claims 7 described a kind of lithium battery porous multilayer composite diaphragms, it is characterized in that: the thickness of polyethylene layer and heat-resistant resin layer is 5-25 μ m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106050326A CN102064301A (en) | 2010-12-25 | 2010-12-25 | Method for manufacturing porous multilayer composite diaphragm for lithium battery and diaphragm |
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|---|---|---|---|
| CN2010106050326A CN102064301A (en) | 2010-12-25 | 2010-12-25 | Method for manufacturing porous multilayer composite diaphragm for lithium battery and diaphragm |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956447A (en) * | 2014-04-23 | 2014-07-30 | 明基材料有限公司 | Porous isolating membrane and manufacturing method thereof |
| CN105355812A (en) * | 2015-12-14 | 2016-02-24 | 苏州锂盾储能材料技术有限公司 | Preparation method of lithium-ion battery diaphragm |
| CN105797589A (en) * | 2015-01-02 | 2016-07-27 | 中原工学院 | Method for preparing composite polytetrafluoroethylene and ultrahigh-modulus polyethylene filtering membrane |
| CN106328867A (en) * | 2015-06-23 | 2017-01-11 | 辽源鸿图锂电隔膜科技股份有限公司 | Heat shrinkage-resistant lithium-ion battery separator |
| CN106328868A (en) * | 2015-06-23 | 2017-01-11 | 辽源鸿图锂电隔膜科技股份有限公司 | Heat shrinkage-resistant lithium ion battery diaphragm and extractant composition used by diaphragm |
| CN107254061A (en) * | 2017-05-11 | 2017-10-17 | 宁波卓越印务有限公司 | A kind of print film and preparation method thereof |
| CN107732100A (en) * | 2017-09-11 | 2018-02-23 | 武汉惠强新能源材料科技有限公司 | A kind of three-layer co-extruded lithium ion battery separator and preparation method thereof |
| CN108263056A (en) * | 2016-12-30 | 2018-07-10 | 深圳市星源材质科技股份有限公司 | A kind of multilayer microporous film and preparation method thereof |
| CN109411672A (en) * | 2018-09-17 | 2019-03-01 | 湖北江升新材料有限公司 | A kind of technique preparing lithium ion battery separator |
| CN114784454A (en) * | 2022-06-17 | 2022-07-22 | 宁波长阳科技股份有限公司 | High-temperature-resistant polyolefin microporous membrane and preparation method thereof |
| CN114784459A (en) * | 2022-06-17 | 2022-07-22 | 宁波长阳科技股份有限公司 | Three-layer co-extrusion diaphragm with high heat resistance and high strength and preparation method thereof |
| WO2023045384A1 (en) * | 2021-09-26 | 2023-03-30 | 中材锂膜有限公司 | High-porosity, high-permeability lithium ion battery base film and preparation method therefor, and lithium ion battery |
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| CN101208198A (en) * | 2005-06-24 | 2008-06-25 | 东燃化学株式会社 | Polyethylene multilayer microporous membrane, battery separator using same, and battery |
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| CN103956447A (en) * | 2014-04-23 | 2014-07-30 | 明基材料有限公司 | Porous isolating membrane and manufacturing method thereof |
| CN103956447B (en) * | 2014-04-23 | 2016-10-05 | 明基材料有限公司 | A kind of porous isolating membrane and manufacture method thereof |
| CN105797589A (en) * | 2015-01-02 | 2016-07-27 | 中原工学院 | Method for preparing composite polytetrafluoroethylene and ultrahigh-modulus polyethylene filtering membrane |
| CN105797589B (en) * | 2015-01-02 | 2018-03-06 | 中原工学院 | The preparation method of ptfe composite and ultra high modulus polyethylene filter membrane |
| CN106328867A (en) * | 2015-06-23 | 2017-01-11 | 辽源鸿图锂电隔膜科技股份有限公司 | Heat shrinkage-resistant lithium-ion battery separator |
| CN106328868A (en) * | 2015-06-23 | 2017-01-11 | 辽源鸿图锂电隔膜科技股份有限公司 | Heat shrinkage-resistant lithium ion battery diaphragm and extractant composition used by diaphragm |
| CN106328868B (en) * | 2015-06-23 | 2019-10-11 | 辽源鸿图锂电隔膜科技股份有限公司 | A kind of lithium ion battery separator and used extractant composition of resistance to thermal contraction |
| CN106328867B (en) * | 2015-06-23 | 2019-07-16 | 辽源鸿图锂电隔膜科技股份有限公司 | A kind of lithium ion battery separator of resistance to thermal contraction |
| CN105355812A (en) * | 2015-12-14 | 2016-02-24 | 苏州锂盾储能材料技术有限公司 | Preparation method of lithium-ion battery diaphragm |
| CN105355812B (en) * | 2015-12-14 | 2018-06-19 | 苏州锂盾储能材料技术有限公司 | A kind of preparation method of lithium electric separator |
| CN108263056A (en) * | 2016-12-30 | 2018-07-10 | 深圳市星源材质科技股份有限公司 | A kind of multilayer microporous film and preparation method thereof |
| CN108263056B (en) * | 2016-12-30 | 2019-09-13 | 深圳市星源材质科技股份有限公司 | A kind of multilayer microporous film and preparation method thereof |
| CN107254061A (en) * | 2017-05-11 | 2017-10-17 | 宁波卓越印务有限公司 | A kind of print film and preparation method thereof |
| CN107732100A (en) * | 2017-09-11 | 2018-02-23 | 武汉惠强新能源材料科技有限公司 | A kind of three-layer co-extruded lithium ion battery separator and preparation method thereof |
| CN107732100B (en) * | 2017-09-11 | 2020-06-02 | 武汉惠强新能源材料科技有限公司 | Three-layer co-extrusion lithium ion battery diaphragm and preparation method thereof |
| CN109411672A (en) * | 2018-09-17 | 2019-03-01 | 湖北江升新材料有限公司 | A kind of technique preparing lithium ion battery separator |
| WO2023045384A1 (en) * | 2021-09-26 | 2023-03-30 | 中材锂膜有限公司 | High-porosity, high-permeability lithium ion battery base film and preparation method therefor, and lithium ion battery |
| CN114784454A (en) * | 2022-06-17 | 2022-07-22 | 宁波长阳科技股份有限公司 | High-temperature-resistant polyolefin microporous membrane and preparation method thereof |
| CN114784459A (en) * | 2022-06-17 | 2022-07-22 | 宁波长阳科技股份有限公司 | Three-layer co-extrusion diaphragm with high heat resistance and high strength and preparation method thereof |
| CN114784459B (en) * | 2022-06-17 | 2022-09-13 | 宁波长阳科技股份有限公司 | Three-layer co-extrusion diaphragm with high heat resistance and high strength and preparation method thereof |
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