CN103199210B - A kind of lithium ion battery separator - Google Patents
A kind of lithium ion battery separator Download PDFInfo
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- CN103199210B CN103199210B CN201310140935.5A CN201310140935A CN103199210B CN 103199210 B CN103199210 B CN 103199210B CN 201310140935 A CN201310140935 A CN 201310140935A CN 103199210 B CN103199210 B CN 103199210B
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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
Abstract
The invention discloses a kind of lithium ion battery separator, this barrier film is made up of polyolefin and particles of inorganic material, by extruding, stretches, extraction, transverse direction or biaxial tension, the operation preparations such as heat treatment; Wherein, in heat treatment step, heating-up temperature is 100 ~ (polyolefin fusing point+70) DEG C, processing time is 0.5-6min, membrane surface polymer melted is made by the heat treatment of ultra-high temperature, thus form the barrier film of surface porosity factor lower than central porisity rate, in not only can preventing battery from using, lithium crystallization penetrates barrier film and causes short circuit, but also can ensure to have sufficiently high electrolyte conservation rate and high battery capacity.The overall porosity of barrier film of the present invention is 50-80%, and surface porosity factor is 20-50%, and core porosity is 50-90%.There is excellent resistance to elevated temperatures.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to a kind of lithium ion battery separator.
Background technology
In the structure of lithium battery, barrier film is one of interior layer assembly of key.The performance of barrier film determines the interfacial structure, internal resistance etc. of battery, directly affects the characteristics such as the capacity of battery, circulation and security performance, and the barrier film of excellent performance has important effect to the combination property improving battery.
The Main Function of barrier film is that the positive and negative electrode of battery is separated, and prevents the two poles of the earth from contacting and short circuit, has the function that electrolyte ion can be made to pass through in addition.Barrier film material is nonconducting, and the performance of its physicochemical properties to battery has a great impact.The kind of battery is different, and the barrier film of employing is also different.For lithium battery series, because electrolyte is organic solvent system, thus need the diaphragm material of organic solvent-resistant, the general polyolefin porous membrane adopting high-strength thin-film.
At present, polyalkene diaphragm production technology can be divided into two kinds according to dry method (fusion drawn, MSCS) and wet method (Thermal inactive, TIPS), and dry method can be subdivided into simple tension technique and stretch processes again simultaneously.
The basic process of wet method refers in the solvent at high temperature polymer being dissolved in higher boiling point, low volatility and forms homogeneous phase liquid, then cooling down, cause solution to produce liquid-solid phase to be separated or liquid-liquid phase separation, select volatile reagent to be extracted by high boiling solvent again, obtain the porous membranes of certain planform through super-dry.At barrier film with in microporous barrier manufacture process, unidirectional or biaxial tension can be carried out before solvent extraction, carry out heat treatment after extraction and rolling film forming, also can stretch after the extraction.
The development of battery diaphragm is along with the demand of lithium battery constantly changes and development, especially along with lithium battery is in the use in the fields such as electric bicycle, electric automobile and electric tool, in order to obtain high capacity, provide large power, a usual battery needs to use dozens or even hundreds of battery core to be connected in series.Because lithium battery has potential explosion hazard, the fail safe of barrier film is quite important.But no matter polyethylene, polypropylene or other thermoplastic macromolecule materials, all can the contraction distortion because of fusing close to material during fusing point, brings potential hidden danger to the fail safe of electrokinetic cell.Domestic and international many companies and research institution all improve for barrier film thermal stability aspect.
Propose a kind of technique being coated with PVDF on polypropylene diaphragm in US7794511 american documentation literature, temperature tolerance can be improved to a certain extent, but because PVDF material melting point is about 170 degree, still can not meet the requirement of electric automobile heatproof 200 degree;
201110002330.0 Chinese patent literature in a kind of technique at polyalkene diaphragm surface coated inorganic thing is proposed, alumina/silica/the zirconia etc. of certain particle diameter is coated membrane surface, utilizes the resistance to elevated temperatures of inorganic matter to improve the temperature tolerance of barrier film entirety.But the gas permeability of barrier film can be affected after inorganic matter coating, and then reduce the capacity of the battery finally made, the oxide be simultaneously coated with easily comes off from polyalkene diaphragm surface in battery use procedure or particles of inorganic material is fallen into the cavity of polyalkene diaphragm and caused plug-hole, and these all can cause bad impact to battery use.
Along with the use of lithium battery on electric automobile, the barrier film being obtained high temperature tolerance by different technological means has become an obvious development trend.But existing market is to be coated with the mode of organic substance and inorganic matter, be with the addition of again a step coating process, complex process after existing barrier film production technology; Although simultaneously effect is all blocked to original polyalkene diaphragm micropore adopting different technology to reduce to be coated with in each producer, but the mode of coating has determined that coating layer will inevitably block the former septate micropore of part, the high power capacity that this and electric automobile require has been runed counter to.
Summary of the invention
For above-mentioned prior art, the invention provides a kind of lithium ion battery separator, membrane surface position of the present invention is different with porosity from diaphragm center part aperture, in not only can preventing battery from using, lithium crystallization penetrates barrier film and causes short circuit, but also can ensure to have sufficiently high electrolyte conservation rate and high battery capacity.
In order to solve the problems of the technologies described above, the technical scheme that a kind of lithium ion battery separator of the present invention is achieved is: this lithium ion battery separator has following component composition according to ratio of quality and the number of copies: 12-30 part polyolefin and 4-24 part particles of inorganic material, and its preparation method comprises following steps:
1) polyolefin, particles of inorganic material and plasticiser being joined in double screw extruder, forming homogeneous phase by adding hot shearing; When extruding, temperature is 150-250 degree, and screw speed is at 100-600rpm;
2) mixture that double screw extruder is extruded forms sheet material by hanger-style die, and cooling formation thickness is the thick film of 500-3000um on chill roll; Chill roll is single-contact melt cooling or double contact melt cooling, and chill-roll temperature is 0-50 DEG C;
3) by the stretching of a direction or both direction, stretch ratio be 9-50 doubly, thick film is drawn into film; Draft temperature is at 80-130 DEG C, if the stretching of both direction, then after first longitudinal stretching, cross directional stretch or transverse and longitudinal both direction stretch simultaneously;
4) film is through filling with the cell body of extractant, is washed away by the plasticiser in film, and after extraction, plasticiser residual quantity is lower than 1%;
5) be 1-2.5 cross directional stretch doubly from the extraction tank stretched ratio of film out, the temperature of this cross directional stretch is 100-130 DEG C;
6) film is heat-treated, adopt air heat or hot-rolling heating, heating-up temperature is 100 ~ (polyolefin fusing point+70) DEG C, processing time is 0.5-6min, film surface polymer melted after heat treatment, final acquisition surface porosity factor is lower than the lithium ion battery separator of core porosity.
Further, above-mentioned steps 6) in, preferred heating-up temperature is (polyolefin fusing point+5) ~ (polyolefin fusing point+50 DEG C).
The lithium ion battery separator obtained by preparation method of the present invention, the overall porosity of its barrier film is 50-80%, and surface porosity factor is 20-50%, and core porosity is 50-90%.
Compared with prior art, the invention has the beneficial effects as follows:
1. the product that the present invention prepares compares the thermal endurance with very high-temperature with common polyalkene diaphragm.
2. with there is resistant to elevated temperatures painting cloth diaphragm compare, avoid and be coated with the micropore caused and tail off, the impact that battery capacity reduces.Product of the present invention has porosity apparently higher than coated product and battery capacity.
3. present invention process mainly comprises polyalkene diaphragm preparation and coating, and it is simple for process, is only to improve common polyolefin preparation technology, does not increase numerous and diverse processing step again, is still a step production technology.
4. the heat treatment temperature in present invention process process can realize the different of membrane surface and median pore radius and porosity, wherein, surface porosity factor is low can prevent battery from using in lithium crystallization penetrate barrier film and cause short circuit, central porisity rate greatly then can ensure sufficiently high electrolyte conservation rate and high battery capacity.
Accompanying drawing explanation
Fig. 1 is the electron scanning micrograph of the embodiment of the present invention 1;
Fig. 2 is the electron scanning micrograph of comparative example 1.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
A kind of lithium ion battery separator of the present invention, is made up of polyolefin and particles of inorganic material, by extruding, stretches, extraction, cross directional stretch, the operation preparations such as heat treatment.This barrier film has the high porosity of 50-80%, excellent resistance to elevated temperatures; And its surface porosity factor is lower than central porisity rate.
Prepare lithium ion battery separator of the present invention and comprise following raw material:
1. polyolefin, polyolefin can be the mixture that a kind of material or two or more polyolefin are formed.Polyolefin can be polyethylene (PE), polypropylene (PP), or the copolymer containing alpha-alkene.Wherein preferably polyethylene can be ultra-high molecular weight polyethylene (UHMWPE), high density polyethylene (HDPE) (HDPE), low density polyethylene (LDPE) (LDPE) and linear low density polyethylene (LLDPE) (LLDPE).PE can be one matter, or the mixture of two kinds of PE.When selecting single PE, preferred Mw is at 1 × more than 10^6 UHMWPE; When employing two kinds of PE mixing, preferred MW is blended at the HDPE of 1 × more than 10^6 UHMWPE and Mw within the scope of 10^4-5 × 10^5.
2. particles of inorganic material, particles of inorganic material can be one or several in the sulfate of the metal such as carbonate and silicon, aluminium, calcium, titanium, barium of the metal such as nitride or silicon, aluminium, calcium, titanium, barium of the metal such as oxide and silicon, aluminium, calcium, titanium, barium of the metals such as silicon, aluminium, calcium, titanium, barium.Preferred silicon dioxide, alundum (Al2O3) and titanium dioxide.The preferred 1-200nm of particle diameter of particles of inorganic material, more preferably 10-100nm.The preparation method of particles of inorganic material can be the methods such as gas phase, precipitation, calcining.
3. plasticiser, plasticiser can be paraffin oil, dioctyl phthalate, dibutyl phthalate, diethyl phthalate etc., can be one or more in above material.
4. other additives, in the scope not damaging advantage of the present invention, as required, can with the antioxidants such as phenols, sulphur class, the metal soaps such as calcium stearate, light stabilizer, the additives such as electrical static eliminator with the use of.
5. extractant, extractant can be the hydro carbons such as n-hexane, heptane; The halogenated hydrocarbons such as carrene, trichloroethanes, trichloroethylene, ethers, hydrogen fluorine ether, the alcohols such as ethanol, the ketone such as acetone, butanone.
This lithium ion battery separator has following component composition according to ratio of quality and the number of copies: 12-20 part polyolefin and 4-24 part particles of inorganic material.
The preparation technology of lithium ion battery separator of the present invention comprises the following steps:
1) polyolefin, particles of inorganic material and plasticiser being joined in double screw extruder, forming homogeneous phase by adding hot shearing; When extruding, temperature is 150-250 degree, and screw speed is at 100-600rpm;
2) mixture that double screw extruder is extruded forms sheet material by hanger-style die, and cooling formation thickness is the thick film of 500-3000um on chill roll; Chill roll is single-contact melt cooling or double contact melt cooling, and chill-roll temperature is 0-50 DEG C;
3) by the stretching of a direction or both direction, stretch ratio be 9-50 doubly, thick film is drawn into film; Draft temperature is at 80-130 DEG C, if the stretching of both direction, then after first longitudinal stretching, cross directional stretch or transverse and longitudinal both direction stretch simultaneously;
4) film is through filling with the cell body of extractant, is washed away by the plasticiser in film, and after extraction, plasticiser residual quantity is lower than 1%;
5) be 1-2.5 cross directional stretch doubly from the extraction tank stretched ratio of film out, the temperature of this cross directional stretch is 100-130 DEG C;
6) film is heat-treated, adopt air heat or hot-rolling heating, heating-up temperature is 100 ~ (polyolefin fusing point+70) DEG C, this heating-up temperature is preferably (polyolefin fusing point+5) ~ (polyolefin fusing point+50 DEG C), processing time is 0.5-6min, the film surface polymer melted after heat treatment, and the final surface porosity factor that obtains is lower than core porosity, namely surface porosity factor is 20-50%, and core porosity is the lithium ion battery separator of 50-90%.(
The feature of lithium ion battery separator of the present invention is: surface porosity factor is little, and central porisity rate is large; During the little porosity in surface can prevent battery from using, lithium crystallization penetrates barrier film and causes short circuit, and central porisity rate can ensure greatly sufficiently high electrolyte conservation rate and high battery capacity.
Tell about detailed process of the present invention by the following examples, provide embodiment to be convenience in order to understand, is never restriction the present invention.
Embodiment 1
Be the ultra-high molecular weight polyethylene of 1,000,000, the silicon dioxide of 10 parts of particle diameter 50nm by 20 parts of molecular weight, 70 parts of paraffin oils are extruded by double screw extruder, and extrusion temperature is 220 DEG C, and chill-roll temperature is 25 DEG C, obtains the thick film of thickness 1000um.Enter biaxial orientation stretching machine longitudinally to stretch 7 times with laterally each, draft temperature is 120 DEG C.Film after stretching enters in heptane groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.2 times bounces back to 1.05 times, and transverse drawing temperature is 130 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 150 DEG C, processing time 6min.
Embodiment 2
Change biaxial tension ratio in embodiment 1 into 5 × 5 times, all the other are identical with embodiment 1.
Embodiment 3
Change heat treatment temperature in embodiment 1 into 130 DEG C, all the other are identical with embodiment 1.
Embodiment 4
Be the ultra-high molecular weight polyethylene of 1,000,000, the silicon dioxide of 15 parts of particle diameter 50nm by 15 parts of molecular weight, 70 parts of paraffin oils are extruded by double screw extruder, and extrusion temperature is 230 DEG C, and chill-roll temperature is 5 DEG C.All the other are identical with embodiment 1.
Embodiment 5
Be the ultra-high molecular weight polyethylene of 1,000,000, the silicon dioxide of 24 parts of particle diameter 50nm by 12 parts of molecular weight, 64 parts of paraffin oils are extruded by double screw extruder, and extrusion temperature is 250 DEG C, and chill-roll temperature is 5 DEG C, obtains the thick film of thickness 2000um.Enter biaxial orientation stretching machine longitudinally to stretch 7 times with laterally each, draft temperature is 120 DEG C.Film after stretching enters in heptane groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.2 times bounces back to 1.05 times, and transverse drawing temperature is 130 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 180 DEG C, processing time 3min.
Embodiment 6
Be the ultra-high molecular weight polyethylene of 1,000,000 by 8 parts of molecular weight, 18 parts of molecular weight are the high density polyethylene (HDPE) of 300,000,4 parts of melt index are the polypropylene of 2, the silicon dioxide of 4 parts of particle diameter 50nm, 66 parts of paraffin oils are extruded by double screw extruder, extrusion temperature is 200 DEG C, chill-roll temperature is 50 DEG C, obtains the thick film of thickness 2000um.Enter biaxial orientation stretching machine longitudinally to stretch 7 times with laterally each, draft temperature is 105 DEG C.Film after stretching enters in heptane groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.2 times bounces back to 1.05 times, and transverse drawing temperature is 133 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 150 DEG C, processing time 3min.
Embodiment 7
Be the ultra-high molecular weight polyethylene of 1,000,000 by 8 parts of molecular weight, 20 parts of molecular weight are the high density polyethylene (HDPE) of 300,000, the aluminium oxide of 10 parts of particle diameter 100nm, 62 parts of paraffin oils are extruded by double screw extruder, and extrusion temperature is 220 DEG C, chill-roll temperature is 40 DEG C, obtains the thick film of thickness 500um.Enter biaxial orientation stretching machine longitudinally to stretch 5 times with laterally each, draft temperature is 125 DEG C.Film after stretching enters in butanone groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.1 times bounces back to 1.05 times, and transverse drawing temperature is 133 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 160 DEG C, processing time 1min.
Embodiment 8
By the calcium carbonate that 30 parts of molecular weight are the high density polyethylene (HDPE) of 500,000,8 parts of particle diameter 200nm, 62 parts of paraffin oils are extruded by double screw extruder, and extrusion temperature is 180 DEG C, and chill-roll temperature is 5 DEG C, obtains the thick film of thickness 2000um.Enter biaxial orientation stretching machine longitudinally to stretch 5 times with laterally each, draft temperature is 90 DEG C.Film after stretching enters in heptane groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.2 times bounces back to 1.05 times, and transverse drawing temperature is 131 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 150 DEG C, processing time 6min.
Embodiment 9
By the titanium dioxide that 20 parts of molecular weight are the high density polyethylene (HDPE) of 500,000,10 parts of particle diameter 15nm, 70 parts of paraffin oils, 0.5 part of antioxidant tertiary butyl hydroquinone, is extruded by double screw extruder, and extrusion temperature is 200 DEG C, chill-roll temperature is 5 DEG C, obtains the thick film of thickness 2000um.Enter biaxial orientation stretching machine longitudinally to stretch 7 times with laterally each, draft temperature is 110 DEG C.Film after stretching enters in heptane groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.2 times bounces back to 1.05 times, and transverse drawing temperature is 131 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 170 DEG C, processing time 6min.
Comparative example 1
Be the ultra-high molecular weight polyethylene of 1,000,000 by 20 parts of molecular weight, 80 parts of paraffin oils are extruded by double screw extruder, and extrusion temperature is 210 DEG C, and chill-roll temperature is 25 DEG C, obtains the thick film of thickness 1600um.Enter biaxial orientation stretching machine longitudinally to stretch 7 times with laterally each, draft temperature is 120 DEG C.Film after stretching enters in heptane groove, stops 10min.Enter transverse drawing mill after extraction, then transversely stretch 1.2 times bounces back to 1.05 times, and transverse drawing temperature is 130 DEG C.Eventually pass the heat treatment of two sides hot-rolling, heat roller temperature is 130 DEG C, processing time 6min.
Comparative example 2
The barrier film of comparative example 1 is coated with one deck inorganic matter.
Dissolved in acetone by the PVDF-CTFE of 10%, dispersed with stirring 12h forms homogeneous slurries.By SiO
2particle joins in established slurries, stirs 12h, forms slurries (SiO
2addition controls at PVDF-CTFE:SiO
2=1:2).Be coated on the barrier film both sides of comparative example 1 with dip coating, coating layer thickness is one side 3um.
In order to absolutely prove the feature that lithium ion battery separator of the present invention has, test respectively for above-described embodiment and comparative example for the following aspects, its test result is as shown in following table, and project and the condition of its test are as follows:
1. the test of thickness: adopt calibrator to test at 25 DEG C.
2. the test of porosity: barrier film is cut into the disk that diameter is 47mm, calculates volume according to surface area and thickness gauge, weigh quality with assay balance.
Porosity (%)=(volume-quality/barrier film raw material density)/volume × 100
Barrier film raw material density be according to and alkene and inorganic matter proportioning and the averag density that calculates of densitometer separately, plasticiser is not included.
3. the test of air permeability: Gurley air permeability instrument tests certain gas flow by the time needed for barrier film.
4. the test of puncture strength: adopt universal testing machine, syringe needle radius of curvature is 0.5mm.
5. the test of shrinkage: square barrier film is put into baking oven, temperature 105 DEG C or 150 DEG C, time 1h.The change calculations measuring length in both direction goes out shrinkage.
Shrinkage (%)=(after original length-baking length)/original length × 100
Relatively the embodiment of the present invention 1 and comparative example 2 can be found out, the overall porosity of embodiment 1 is 70%, but from electron scanning micrograph, can find out that surface porosity factor is not high; Comparative example 1 porosity is 42% can see that surface porosity factor is higher than embodiment 1 from electron micrograph.Namely to have surface porosity factor low for barrier film of the present invention, the feature that central porisity rate is high.
In a word, the barrier film that the present invention obtains is compared with conventional polyolefin barrier film (comparative example 1), and porosity and air permeability exceed a lot, must bring capacity high in battery; Thermal contraction performance simultaneously, especially 150 DEG C of thermal contraction performances are obviously better than comparative example 1.The barrier film that the present invention obtains is compared with painting cloth diaphragm (comparative example 2), and thermal contraction performance also improves a lot, simultaneously porosity and air permeability a lot of higher than comparative example 2.
Although invention has been described for composition graphs above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; when not departing from present inventive concept, can also make a lot of distortion, these all belong within protection of the present invention.
Claims (6)
1. a lithium ion battery separator, according to ratio of quality and the number of copies, there is following component composition: 12-30 part polyolefin and 4-24 part particles of inorganic material, described particles of inorganic material is one or more in silicon dioxide, alundum (Al2O3) and titanium dioxide, and the particle diameter of particles of inorganic material is 10-100nm; Its preparation method comprises following steps:
1) polyolefin, particles of inorganic material and plasticiser being joined in double screw extruder, forming homogeneous phase by adding hot shearing; When extruding, temperature is 150-250 degree, and screw speed is at 100-600rpm;
2) mixture that double screw extruder is extruded forms sheet material by hanger-style die, and cooling forms the thick film that thickness is 500-3000 μm on chill roll; Chill roll is single-contact melt cooling or double contact melt cooling, and chill-roll temperature is 0-50 DEG C;
3) by the stretching of a direction or both direction, stretch ratio be 9-50 doubly, thick film is drawn into film; Draft temperature is at 80-130 DEG C, if the stretching of both direction, then after first longitudinal stretching, cross directional stretch or transverse and longitudinal both direction stretch simultaneously;
4) film is through filling with the cell body of extractant, is washed away by the plasticiser in film, and after extraction, the percentage by weight of plasticiser residual quantity is lower than 1%;
5) be 1-2.5 cross directional stretch doubly from the extraction tank stretched ratio of film out, the temperature of this cross directional stretch is 100-130 DEG C;
6) film is heat-treated, adopt air heat or hot-rolling heating, heating-up temperature is that polyolefin fusing point+5 DEG C is to polyolefin fusing point+50 DEG C, processing time is 0.5-6min, film surface polymer melted after heat treatment, final acquisition surface porosity factor is lower than the lithium ion battery separator of core porosity; The overall porosity of its barrier film is 50-80%, and surface porosity factor is 20-50%, and core porosity is 50-90%.
2. lithium ion battery separator according to claim 1, is characterized in that, polyolefin is the mixture that a kind of material or two or more polyolefin are formed.
3. lithium ion battery separator according to claim 1, it is characterized in that, polyolefin is polyethylene (PE), polypropylene (PP), or the copolymer containing alpha-alkene.
4. lithium ion battery separator according to claim 3, it is characterized in that, described polyethylene is ultra-high molecular weight polyethylene (UHMWPE), high density polyethylene (HDPE) (HDPE), any one in low density polyethylene (LDPE) (LDPE) and linear low density polyethylene (LLDPE) (LLDPE).
5. lithium ion battery separator according to claim 4, it is characterized in that, described polyethylene is the mixture of single polyethylene material or two kinds of polythene PEs; If during single polyethylene, adopt Mw at 1 × more than 10^6 ultra-high molecular weight polyethylene UHMWPE; If during two kinds of poly mixtures, adopt MW blended at the high density polyethylene of 1 × more than 10^6 ultra-high molecular weight polyethylene UHMWPE and Mw within the scope of 10^4-5 × 10^5.
6. lithium ion battery separator according to claim 1, is characterized in that, step 3) in draft temperature be 90-125 DEG C, take the stretching of both direction, stretch ratio is 5 × 5 or 7 × 7 biaxial tensiones.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103700796A (en) * | 2013-12-05 | 2014-04-02 | 宁波华丰包装有限公司 | Preparation method of lithium ion diaphragm |
| CN106252563A (en) * | 2016-08-31 | 2016-12-21 | 河南义腾新能源科技有限公司 | A kind of lithium ion battery separator and preparation method thereof |
| CN108550769A (en) * | 2018-05-21 | 2018-09-18 | 珠海光宇电池有限公司 | The preparation method and lithium ion battery of lithium ion battery separator |
| CN108832064A (en) * | 2018-06-26 | 2018-11-16 | 河北金力新能源科技股份有限公司 | A kind of composite ceramic porous lithium electric separator, preparation method and applications |
| CN113451706A (en) * | 2018-07-17 | 2021-09-28 | 河南义腾新能源科技有限公司 | Polyethylene diaphragm for lithium ion battery and preparation method thereof |
| CN110931688B (en) * | 2019-12-13 | 2021-08-31 | 华为技术有限公司 | Highly extended polyolefin separator and applications |
| CN111040215A (en) * | 2019-12-30 | 2020-04-21 | 江苏厚生新能源科技有限公司 | Method for controlling pore size distribution and size of diaphragm by changing crystal structure of UHMWPE material |
| CN113451707A (en) * | 2020-03-26 | 2021-09-28 | 溧阳月泉电能源有限公司 | Polyolefin diaphragm and preparation method thereof |
| CN112290165A (en) * | 2020-11-05 | 2021-01-29 | 青岛蓝科途膜材料有限公司 | Lithium ion battery diaphragm, preparation method and lithium ion battery |
| CN113972435B (en) * | 2021-09-26 | 2023-01-03 | 中材锂膜有限公司 | Preparation method of high-porosity and high-permeability lithium ion battery base membrane |
| CN114843705A (en) * | 2022-05-16 | 2022-08-02 | 武汉中原长江科技发展有限公司 | Lithium metal battery diaphragm and preparation method and application thereof |
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| CN101600571A (en) * | 2007-01-30 | 2009-12-09 | 旭化成电子材料株式会社 | Multilayer porous film and manufacture method thereof |
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| CN101600571A (en) * | 2007-01-30 | 2009-12-09 | 旭化成电子材料株式会社 | Multilayer porous film and manufacture method thereof |
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