CN108565379A - A kind of lithium battery diaphragm and preparation method thereof - Google Patents

A kind of lithium battery diaphragm and preparation method thereof Download PDF

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Publication number
CN108565379A
CN108565379A CN201810223944.3A CN201810223944A CN108565379A CN 108565379 A CN108565379 A CN 108565379A CN 201810223944 A CN201810223944 A CN 201810223944A CN 108565379 A CN108565379 A CN 108565379A
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CN
China
Prior art keywords
lithium battery
aromatic polymer
battery diaphragm
basement membrane
diaphragm
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CN201810223944.3A
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Chinese (zh)
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CN108565379B (en
Inventor
程跃
杨文科
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上海恩捷新材料科技股份有限公司
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Priority to CN201810223944.3A priority Critical patent/CN108565379B/en
Publication of CN108565379A publication Critical patent/CN108565379A/en
Priority claimed from PCT/CN2018/112707 external-priority patent/WO2019085899A1/en
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Publication of CN108565379B publication Critical patent/CN108565379B/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/14Separators; Membranes; Diaphragms; Spacing elements
    • H01M2/145Manufacturing processes
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/14Separators; Membranes; Diaphragms; Spacing elements
    • H01M2/16Separators; Membranes; Diaphragms; Spacing elements characterised by the material
    • H01M2/1606Separators; Membranes; Diaphragms; Spacing elements characterised by the material comprising fibrous material
    • H01M2/162Organic fibrous material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/14Separators; Membranes; Diaphragms; Spacing elements
    • H01M2/16Separators; Membranes; Diaphragms; Spacing elements characterised by the material
    • H01M2/164Separators; Membranes; Diaphragms; Spacing elements characterised by the material comprising non-fibrous material
    • H01M2/1646Inorganic non-fibrous material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/14Separators; Membranes; Diaphragms; Spacing elements
    • H01M2/16Separators; Membranes; Diaphragms; Spacing elements characterised by the material
    • H01M2/1686Separators having two or more layers of either fibrous or non-fibrous materials
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

A kind of lithium battery diaphragm of present invention offer and preparation method thereof, the method includes:1) aromatic polymer and ceramic powders are added in solvent and are dissolved, aromatic polymer slurry is made;2) the aromatic polymer slurry is coated on lithium battery membrane surface;3) structure for obtaining step 2) carries out water bath with thermostatic control washing, then dries, and obtains lithium battery diaphragm.After the preparation method of the present invention can make aromatic polymer slurry be coated in membrane surface, fibrous web-like pattern is precipitated in crystallization at the appropriate speed, forms solid netted fibre structure.Using solid netted fibre structure as skeleton, ensure that the aromatic polymer coating film has excellent heat resistance, in addition, the mesh in solid netted fibre structure makes diaphragm have higher gas permeability again.This method compared with prior art, has lacked temperature humidity processing links, not only simplifies technological process, and improve production efficiency, reduces production cost, uses manpower and material resources sparingly.

Description

A kind of lithium battery diaphragm and preparation method thereof

Technical field

The invention belongs to technical field of lithium ion, more particularly to a kind of lithium battery diaphragm of high safety highly-breathable And preparation method thereof.

Background technology

Lithium ion battery have the characteristics that energy density is high, operating voltage is high, memory-less effect and have extended cycle life and by Be widely used as the power supply of various mobile devices, especially in electric vehicle field, the power battery of big multiplying power charge and discharge performance by Favor.With extensive application of the lithium secondary battery on electric vehicle, high capacity, high output, high security have become dynamic The direction of power battery development.Correspondingly, lithium battery diaphragm is also constantly towards high heat-resisting, high safety, macroion permeability direction Development.

Lithium ion battery is usually mainly by anode, cathode, diaphragm, electrolyte, battery case composition.Lithium ion battery structure In, diaphragm is one of the interior layer assembly of key.The main function of diaphragm is to separate the positive and negative electrode of battery, is prevented positive and negative Pole is in direct contact and short-circuit, while electrolyte ion also to be enable to be passed through in battery charge and discharge process, forms electric current, When battery operating temperature is abnormal raising, the migrating channels of electrolyte ion are closed, cut-out electric current ensures cell safety.By This directly affects capacity, cycle and the safety of battery as it can be seen that the performance of diaphragm determines the interfacial structure of battery, internal resistance etc. The characteristics such as 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.

In order to improve the safety in utilization of lithium ion battery isolation film, most common method is carried out to polyolefin porous membrane Slurry coating process.The aromatic polymers such as the aromatic polyamide as excellent heat resistance are widely used in being coated in heat-resisting Property shortcoming using polyolefin on the perforated membrane of principal component and to form heat-resisting solid netted fibrous layer, for improving nonaqueous electrolytic solution The safety of secondary cell.But since fine and close reticular structure so that perforated membrane ion passability is greatly hindered, so This lithium battery diaphragm can not have while with superior heat resistance possesses excellent permeability, to influence the appearance of battery Amount and efficiency.

Invention content

In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of lithium battery diaphragm and its preparations Method, the lithium battery diaphragm preparation process for solving the prior art are difficult that prepare structure on the surface of lithium battery basement membrane steady It is fixed, more than mesh the problem of uniform coating film.

In order to achieve the above objects and other related objects, the present invention provides a kind of preparation method of lithium battery diaphragm, described Preparation method includes at least:

1) aromatic polymer and ceramic powders are added in solvent and are dissolved, aromatic polymer slurry is made;

2) the aromatic polymer slurry is coated on lithium battery membrane surface;

3) structure for obtaining step 2) carries out water bath with thermostatic control washing, then dries, obtains the lithium battery diaphragm.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the aromatic series made from step 1) In polymer paste, the weight percentage of the aromatic polymer is between 20%~40%, the weight of the solvent Than between 40%~60%, the weight ratio of the ceramic powders is between 2%~10%.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the aromatic polymer include virtue Fragrant polyamide.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the characteristic of the aromatic polymer Viscosity is 0.5dL/g~1.5dL/g.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the aromatic polyamide include poly- Poly P phenylene diamine terephthalamide, poly, poly(p-benzamide) and polyphenyl are soughed in terephthalamide It is at least one.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the solvent include that N- methyl ratios are coughed up Alkanone (NMP), N, N- dimethyl second phthalein amine (DMAC), N, mono- dimethyl methyl phthalein amine (DMF) of N, dimethyl sulfoxide (DMSO) and phosphoric acid It is one or more in triethyl (TEP).

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the ceramic powders include oxidation It is one or more in aluminium, silica, titanium dioxide and zirconium oxide.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention, the lithium battery basement membrane include poly- second Alkenyl film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene composite materials basement membrane, Kynoar basement membrane, gather at polyimide base film One kind in ethylene non-woven fabrics basement membrane and polypropylene non-woven fabric basement membrane, the thickness of the lithium battery basement membrane between 5 μm~20 μm it Between, porosity is between 30%~60%.

A kind of scheme of optimization of preparation method as lithium battery diaphragm of the present invention in step 3), carries out the constant temperature The temperature of water-bath washing is between 30 DEG C~80 DEG C, and the time is between 1min~10min;The drying uses hot-air seasoning, institute The temperature of hot-air seasoning is stated between 50 DEG C~90 DEG C, the time is between 5min~10min.

The present invention also provides a kind of lithium battery diaphragms prepared using above-mentioned preparation method, and the lithium battery diaphragm includes lithium Battery basement membrane and the coating for being coated on the lithium battery basement membrane unilateral or bilateral, the coating include spatially reticular fiber structure Aromatic polymer and be distributed in the ceramic particle on the aromatic polymer surface, wherein the aromatic series in the coating The weight percentage of polymer between 20%~40%, the weight percentages of the ceramic powders between 50%~ Between 80%.

As described above, the lithium battery diaphragm and preparation method thereof of the present invention, the preparation method includes:1) by fragrant adoption It closes object and ceramic powders is added in solvent and dissolves, aromatic polymer slurry is made;2) the aromatic polymer slurry is applied Cloth is in lithium battery membrane surface;3) structure for obtaining step 2) carries out water bath with thermostatic control washing, then dries, and obtains the lithium electricity Pond diaphragm.The present invention does not need humiture and handles this process procedure, and process is simple, and controllability higher not only increases production Efficiency, and improve product quality stability.In addition, compared with the processing of the humiture of the prior art, the present invention is in thermostatted water It is handled in bath, coating is heated and absorption moisture more stablizes and uniformly, the solid netted fibre structure of two-phase laminated flow, which is more stablized, analyses Go out, mesh distribution uniform in size.

Description of the drawings

Fig. 1 is the preparation method flow diagram of lithium ion battery separator of the present invention.

Fig. 2 is the stereoscan photograph of lithium ion battery separator of the present invention.

Fig. 3 is the TMA correlation curves of the lithium ion battery separator prepared by 1-6 of the embodiment of the present invention and comparative example 1-2.

Specific implementation mode

Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example 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.

Please refer to attached drawing.It should be noted that the diagram provided in the present embodiment only illustrates the present invention in a schematic way Basic conception, only display and related component in the present invention rather than component count, shape when according to actual implementation in schema then Shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can be a kind of random change, and its component cloth Office's kenel may also be increasingly complex.

The aromatic polymers such as the aromatic series virtue amide of usual excellent heat resistance are since moulding process is improper, it is difficult to prepare Stable structure, mesh is more and uniform coating film, and then lithium battery diaphragm can not be made to have superior heat resistance while has and possesses Excellent permeability.In consideration of it, a kind of lithium battery diaphragm of present invention offer and preparation method thereof, what can be stablized produces virtue Fragrant race's polymer coating film lithium ion battery separator ensures while heat resistance and has higher gas permeability.

As shown in Figure 1, the present invention provides a kind of preparation method of lithium battery diaphragm, the preparation method includes at least:

Step S1 is first carried out, aromatic polymer and ceramic powders are added in solvent and dissolved, aromatic series polymerization is made Object slurry.

In this step, can stirring and dissolving in solvent be added in aromatic polymer and ceramic powders simultaneously, it can also be first It is added thereto one kind in a solvent, another kind is added after dissolving, until all dissolvings.

As an example, in the aromatic polymer slurry made from this step, the weight hundred of the aromatic polymer Divide content between 20%~40%, the weight ratio of the solvent is between 40%~60%, the weight of the ceramic powders Ratio is measured between 2%~10%.

As an example, the aromatic polymer includes aromatic polyamide.

As an example, the inherent viscosity of the aromatic polymer is 0.5dL/g~1.5dL/g.

As an example, the aromatic polyamide include poly(p-phenylene terephthalamide), it is poly- between phenyl-diformyl isophthalic two Amine, poly(p-benzamide) and polyphenyl are soughed at least one of terephthalamide.

The solvent needs to be the solvent that can dissolve the aromatic polymer.As an example, the solvent includes N- Methyl is than pyrrolidone, N, N- dimethyl second phthaleins amine, N, one kind in mono- dimethyl methyl phthalein amine of N, dimethyl sulfoxide and triethyl phosphate Or it is a variety of.

As an example, the ceramic powders include one kind or more in aluminium oxide, silica, titanium dioxide and zirconium oxide Kind.

Then step S2 is executed, the aromatic polymer slurry is coated on lithium battery membrane surface.

Coating machine progress may be used in coating process, unlimited herein.

As an example, the lithium battery basement membrane includes polyethylene based film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene One in compound substrate membranes, polyimide base film, Kynoar basement membrane, polyethylene nonwoven basement membrane and polypropylene non-woven fabric basement membrane Kind, the thickness of the lithium battery basement membrane is between 5 μm~20 μm, and porosity is between 30%~60%.

Then step S3 is executed, the structure that step S2 is obtained carries out water bath with thermostatic control washing, then dries, obtains the lithium Battery diaphragm.

As an example, in step S3, the temperature of the water bath with thermostatic control washing is carried out between 30 DEG C~80 DEG C, and the time is situated between In 1min~10min;The drying uses hot-air seasoning, and the temperature of the hot-air seasoning is between 50 DEG C~90 DEG C, the time Between 5min~10min.

For example, the temperature for carrying out the water bath with thermostatic control washing can be 30 DEG C, 35 DEG C, 40 DEG C, 45 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C etc., the time can be 1min, 3min, 4min, 5min, 7min, 10min etc.;The drying is dried using hot wind Dry, the temperature of the hot-air seasoning can be 50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C, 90 DEG C etc., the time can be 5min, 6min, 7min, 8min, 9min, 10min etc..

This step keeps coating heated and absorbs moisture more to stablize and uniformly by handling coating in water bath with thermostatic control, and two Phase separation, which can more stablize, is precipitated solid netted fibre structure, and the mesh size of acquisition is suitable and is uniformly distributed, and helps to carry The gas permeability of high diaphragm.

The present invention also provides a kind of lithium battery diaphragms prepared using above-mentioned preparation method, and the lithium battery diaphragm includes lithium Battery basement membrane and the coating for being coated on the lithium battery basement membrane unilateral or bilateral, the coating include spatially reticular fiber structure Aromatic polymer and be distributed in the ceramic particle on the aromatic polymer surface, wherein the aromatic series in the coating The weight percentage of polymer between 20%~40%, the weight percentages of the ceramic powders between 50%~ Between 80%.

It is illustrated in figure 2 the surface topography map (SEM) of prepared lithium ion battery separator, can show its neutral body The aromatic polymer of fibrous reticular structure.

Below by example, invention is further explained, but content not thereby limiting the invention.

Various assay methods in the application are as shown below.In addition, the evaluation of physical property of aromatic polymer is using following Method carry out.

1) gas permeability

Using Wang Yan formula Permeability gauges, according to conventional methods, it is ventilative to measure aromatic polymer coating lithium ion battery separator Value.

2)TMA

Using TMA testers, additional force 0.025N, 0.5 DEG C/min of heating rate measure aromatic polymer with static method Coat lithium ion battery separator thermomechanical property.

Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate this hair It is bright, rather than limit protection scope of the present invention.Those skilled in the art change according to what the present invention made in practical applications Into and adjustment, still fall within protection scope of the present invention.

Alumina powder 1g is weighed, is added to and is sufficiently stirred 60min in 64gCaCl2/NMP solution and is made into alumina solution, PPTA polymer fluid 35g are added, is sufficiently stirred 20min, is configured to solution-type aromatic polymer slurry.

Embodiment 1:

Obtained coating slurry is coated uniformly on basement membrane by the lithium battery basement membrane for taking 14 μ m thicks using automatic coating machine Unilateral side, coating speed 80m/min is directly placed into 30 DEG C of waters bath with thermostatic control after coated film is coated and handles 2min, then take Go out the dry lithium ion battery separator that can be obtained aromatic polymer coating, the coating layer thickness of the lithium ion battery separator is 4μm。

Embodiment 2

Other than water bath with thermostatic control is 40 DEG C, operation similarly to Example 1 is carried out.It can be obtained aromatic polymer painting The coating layer thickness of the lithium ion battery separator covered, the lithium ion battery separator is 4 μm.

Embodiment 3

Other than water bath with thermostatic control is 50 DEG C, operation similarly to Example 1 is carried out.It can be obtained aromatic polymer painting The coating layer thickness of the lithium ion battery separator covered, the lithium ion battery separator is 4 μm.

Embodiment 4:

Other than water bath with thermostatic control is 60 DEG C, operation similarly to Example 1 is carried out.It can be obtained aromatic polymer painting The coating layer thickness of the lithium ion battery separator covered, the lithium ion battery separator is 4 μm.

Embodiment 5:

Other than water bath with thermostatic control is 70 DEG C, operation similarly to Example 1 is carried out.It can be obtained aromatic polymer painting The coating layer thickness of the lithium ion battery separator covered, the lithium ion battery separator is 4 μm.

Embodiment 6

Other than water bath with thermostatic control is 80 DEG C, operation similarly to Example 1 is carried out.It can be obtained aromatic polymer painting The coating layer thickness of the lithium ion battery separator covered, the lithium ion battery separator is 4 μm.

Comparative example 1

Obtained coating slurry is coated uniformly on the list of basement membrane using automatic coating machine by the basement membrane for taking 14 μ m thicks Side, coating speed 80m/min place 2min after coated film is coated in 60 DEG C, 60%RH climatic chambers.Then in room It is washed in tepidarium, the lithium ion battery separator of aromatic polymer coating, the lithium-ion electric is can be obtained after dry The coating layer thickness of pond diaphragm is 4 μm.

Comparative example 2

Obtained coating slurry is coated uniformly on the list of basement membrane using automatic coating machine by the basement membrane for taking 14 μ m thicks Side, coating speed 80m/min are washed after coated film is coated in room-temperature water bath, can be obtained fragrant adoption after dry The lithium ion battery separator of object coating is closed, the coating layer thickness of the lithium ion battery separator is 4 μm.

The lithium ion battery isolation film permeability coated to above the embodiment of the present invention and comparative example is tested, number According to see the table below 1.The ventilative value of aromatic polymer that embodiment 1-6 is handled through water bath with thermostatic control coating lithium ion battery separator compared with Comparative example (prior art) it is small, illustrate the aromatic polymer handled through water bath with thermostatic control coat lithium ion battery separator gas permeability Preferably, wherein 2 gas permeability of embodiment is best.

Table 1

The lithium ion battery isolation film TMA of above the embodiment of the present invention 1-6 and comparative example 1-2 coatings are tested, As a result See Figure 3.Embodiment 1-6 aromatic polymer coating lithium ion battery separator peak value minimum point shrinking percentage compared with Comparative example it is small, illustrate the aromatic polymer handled through water bath with thermostatic control coating lithium ion battery separator heat resistance it is preferable, peace Full performance is high, and the heat resistance of wherein embodiment 2 is best.

The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe The personage for knowing this technology can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.Cause This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as At all equivalent modifications or change, should by the present invention claim be covered.

Claims (10)

1. a kind of preparation method of lithium battery diaphragm, which is characterized in that the preparation method includes at least:
1) aromatic polymer and ceramic powders are added in solvent and are dissolved, aromatic polymer slurry is made;
2) the aromatic polymer slurry is coated on lithium battery membrane surface;
3) structure for obtaining step 2) carries out water bath with thermostatic control washing, then dries, obtains the lithium battery diaphragm.
2. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:The fragrance made from step 1) In race's polymer paste, the weight percentage of the aromatic polymer is between 20%~40%, the weight of the solvent Ratio is measured between 40%~60%, the weight ratio of the ceramic powders is between 2%~10%.
3. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:The aromatic polymer includes Aromatic polyamide.
4. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:The spy of the aromatic polymer Property viscosity is between 0.5dL/g~1.5dL/g.
5. the preparation method of lithium battery diaphragm according to claim 3, it is characterised in that:The aromatic polyamide includes Poly(p-phenylene terephthalamide), poly, poly(p-benzamide) and polyphenyl are soughed in terephthalamide At least one.
6. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:The solvent includes N- methyl ratios Pyrrolidone, N, N- dimethyl second phthaleins amine, N are one or more in mono- dimethyl methyl phthalein amine of N, dimethyl sulfoxide and triethyl phosphate.
7. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:The ceramic powders include oxidation It is one or more in aluminium, silica, titanium dioxide and zirconium oxide.
8. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:The lithium battery basement membrane includes poly- Vinyl film, polypropylene basement membrane, polypropylene, polyethylene/polypropylene composite materials basement membrane, polyimide base film, Kynoar basement membrane, One kind in polyethylene nonwoven basement membrane and polypropylene non-woven fabric basement membrane, the thickness of the lithium battery basement membrane is between 5 μm~20 μm Between, porosity is between 30%~60%.
9. the preparation method of lithium battery diaphragm according to claim 1, it is characterised in that:In step 3), the perseverance is carried out The temperature of tepidarium washing is between 30 DEG C~80 DEG C, and the time is between 1min~10min;The drying uses hot-air seasoning, The temperature of the hot-air seasoning is between 50 DEG C~90 DEG C, and the time is between 5min~10min.
10. lithium battery diaphragm prepared by a kind of preparation method as described in any one of claim 1~9, which is characterized in that the lithium Battery diaphragm includes lithium battery basement membrane and is coated on the coating of the lithium battery basement membrane unilateral or bilateral, and the coating includes in vertical The aromatic polymer of body reticular fiber structure and the ceramic particle for being distributed in the aromatic polymer surface, wherein described Between 20%~40%, the weight percent of the ceramic powders contains the weight percentage of aromatic polymer in coating Amount is between 50%~80%.
CN201810223944.3A 2018-03-19 2018-03-19 Lithium battery diaphragm and preparation method thereof CN108565379B (en)

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CN201810223944.3A CN108565379B (en) 2018-03-19 2018-03-19 Lithium battery diaphragm and preparation method thereof
PCT/CN2018/112707 WO2019085899A1 (en) 2017-10-31 2018-10-30 Methods for preparing polymer solutions, separators, electrochemical devices and products thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019085899A1 (en) * 2017-10-31 2019-05-09 Shanghai Energy New Materials Technology Co., Ltd. Methods for preparing polymer solutions, separators, electrochemical devices and products thereof

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Publication number Priority date Publication date Assignee Title
CN101180751A (en) * 2005-05-17 2008-05-14 帝人株式会社 Separator for lithium ion secondary battery and lithium ion secondary battery
CN101641808A (en) * 2007-03-23 2010-02-03 住友化学株式会社 Separator
CN101916837A (en) * 2010-08-31 2010-12-15 天津工业大学 Preparation method of composite diaphragm of gel polymer lithium ion battery
CN107359300A (en) * 2017-06-30 2017-11-17 刘桥 A kind of lithium ion battery separator of aramid fiber composite coated and preparation method thereof
CN107427861A (en) * 2015-03-31 2017-12-01 帝人株式会社 The manufacture method of composite membrane
CN107737702A (en) * 2017-07-21 2018-02-27 上海恩捷新材料科技股份有限公司 A kind of oiliness coating process and device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101180751A (en) * 2005-05-17 2008-05-14 帝人株式会社 Separator for lithium ion secondary battery and lithium ion secondary battery
CN101641808A (en) * 2007-03-23 2010-02-03 住友化学株式会社 Separator
CN101916837A (en) * 2010-08-31 2010-12-15 天津工业大学 Preparation method of composite diaphragm of gel polymer lithium ion battery
CN107427861A (en) * 2015-03-31 2017-12-01 帝人株式会社 The manufacture method of composite membrane
CN107359300A (en) * 2017-06-30 2017-11-17 刘桥 A kind of lithium ion battery separator of aramid fiber composite coated and preparation method thereof
CN107737702A (en) * 2017-07-21 2018-02-27 上海恩捷新材料科技股份有限公司 A kind of oiliness coating process and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019085899A1 (en) * 2017-10-31 2019-05-09 Shanghai Energy New Materials Technology Co., Ltd. Methods for preparing polymer solutions, separators, electrochemical devices and products thereof

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