CN108807788A - A kind of lithium-ion-power cell composite diaphragm and preparation method thereof - Google Patents
A kind of lithium-ion-power cell composite diaphragm and preparation method thereof Download PDFInfo
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- CN108807788A CN108807788A CN201810504179.2A CN201810504179A CN108807788A CN 108807788 A CN108807788 A CN 108807788A CN 201810504179 A CN201810504179 A CN 201810504179A CN 108807788 A CN108807788 A CN 108807788A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/431—Inorganic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/44—Fibrous material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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
It is that non-woven fabrics fiber layer is made by electrostatic spinning process in the mixture of poly (arylene ether nitrile) and polyvinyl alcohol to be used as base material the present invention relates to a kind of lithium-ion-power cell composite diaphragm and its manufacturing method；Then obtained non-woven fabrics fiber layer is heated, is then cooled fast to room temperature, is subsequently introduced functional group；Then inorganic particulate of the surface with functional group is mixed with ethyl alcohol, dispersion liquid is made, be coated on above-mentioned base material side, then remove ethyl alcohol；Inorganic particulate and water-soluble polymer and solvent are mixed to form slurry, are coated on the another side and above-mentioned ceramic layer of above-mentioned base material, above-mentioned solvent is removed, forms porous layer；To form above-mentioned composite diaphragm.Composite diaphragm broken film temperature and closed pore temperature difference of the invention is larger and thermal contraction is small, has enough safeties.
Description
Technical field
The present invention relates to novel energy resource material technology field more particularly to a kind of lithium-ion-power cell composite diaphragm and its
Preparation method.
Background technology
Diaphragm, which is arranged, between positive and negative electrode in lithium ion battery prevents electronics from passing through positive and negative electrode isolation, and allows ion
Pass through, when lithium ion battery is abnormal, diaphragm can prevent ion from passing through, and cell reaction is made to stop, and improve the safety of battery
Property, thus the performance of diaphragm play the role of to the comprehensive performance of lithium ion battery it is very important.
Diaphragm is porous structure, and the heat generated when lithium ion battery short circuit makes its temperature increase, and is received after diaphragm is heated
Shrinkage cavity diameter becomes smaller so that micropore occludes, and can cut off circuit of the electric current by lithium ion battery, prevent ion from passing through, prevent inside it
Temperature increases, and the generation of fire incident is prevented, to achieve the purpose that security protection；When the temperature in lithium ion battery is after of continuing rising
Height, since diaphragm melts, viscosity reduces, and diaphragm can be ruptured or be shunk when reaching a certain temperature, if membrane ruptures or contraction are too early,
Positive and negative electrode can be in direct contact, this is breakneck, therefore make diaphragm more than the micropore of diaphragm blocking temperature, that is, closed pore temperature
Keep its shape to be very important, and membrane ruptures temperature, that is, broken film temperature is higher, prevent ion by time it is longer,
The safety of lithium ion battery is higher.Therefore the closed pore temperature of diaphragm plays the safety of lithium ion battery with broken film temperature
Very important effect.The closed pore temperature of diaphragm and broken film temperature are required in the prior art it is higher and higher, with ensure lithium from
Sub- power battery safety.
Invention content
In order to solve the above technical problems, the present invention to provide a kind of broken film temperature and closed pore temperature difference is larger and be heat-shrinked
Small lithium-ion-power cell composite diaphragm.
In order to achieve the above objectives, the present invention adopts the following technical scheme that：
The present invention provides a kind of manufacturing method of lithium-ion-power cell composite diaphragm, the manufacturing method include with
Lower step：
(1) base material is prepared：Non-woven fabrics fibre is made by electrostatic spinning process in the mixture of poly (arylene ether nitrile) and polyvinyl alcohol
Tie up layer；
(2) substrate modifications：Obtained non-woven fabrics fiber layer is heated to 150-190 DEG C, is then cooled fast to room temperature, with
Functional group is introduced by surface physics irradiation or surface chemistry oxidizing process afterwards, functional group is hydroxyl, amino, sulfonic group, epoxy group
Or carboxyl；
(3) coating inorganic particle layer：Inorganic particulate A is mixed with ethyl alcohol, dispersion liquid is made, is then coated in above-mentioned base material
Side then removes ethyl alcohol；
(4) porous layer is formed：Inorganic particulate B is mixed with water-soluble polymer and solvent, slurry is formed, is coated on
It states on the another side and above-mentioned ceramic layer of base material, removes above-mentioned solvent, to form porous layer；
To form above-mentioned composite diaphragm.
In above-mentioned steps 1, poly (arylene ether nitrile) accounts for the 80-95% of total weight of the mixture, and polyvinyl alcohol accounts for total weight of the mixture
5-10%.
Rate of temperature fall in above-mentioned steps 2 is 10-15 DEG C/min.
Above-mentioned inorganic particulate A is nano silicon dioxide, nano aluminium oxide or nano-titanium dioxide, average grain diameter 10-15
Nanometer.
Above-mentioned inorganic particulate B is nano silicon dioxide, nano aluminium oxide or nano-titanium dioxide, average grain diameter 18-25
Nanometer.
Water-soluble polymer in step 4 can be carboxymethyl cellulose, hydroxyethyl cellulose, POLYPROPYLENE GLYCOL or polyethylene
Pyrrolidones.
It, should be every the present invention also provides a kind of lithium-ion-power cell, including anode, cathode and diaphragm between the two
Film is made by above-mentioned manufacturing method.
The advantage of the invention is that：The non-woven fabrics of base material is made as with polyvinyl alcohol using the poly (arylene ether nitrile) of special ratios
Fibrous layer, and inorganic particle layer and porous layer are set on it, it not only can guarantee lower closed pore temperature, but also can guarantee higher broken
Film temperature, while introducing functional group, the adhesion of enhancing base materials and inorganic particle layer in base material and inorganic particle layer.
Specific implementation mode
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.It provides these embodiments to be to be able to be best understood from the disclosure, and can
The scope of the present invention is completely communicated to those skilled in the art.
The present invention uses the poly (arylene ether nitrile) of higher melt and prepares base material compared with the polyvinyl alcohol of low melting point, using electrostatic spinning
After technique forms non-woven fabrics fiber layer, through first heat afterwards be quickly cooled down at the mode of (preferably rate of temperature fall be 10-15 DEG C/min)
Reason, the polyvinyl alcohol of low melting point are first softened or melted, then solidify, can be tightly secured together dystectic poly (arylene ether nitrile),
It can enhancing base materials intensity.In addition, when situations such as short circuit temperature being caused to increase, the polyvinyl alcohol of low melting point, which can melt, to be caused
Hole is closed, and dystectic poly (arylene ether nitrile) is still kept stablizing to maintain base material indeformable, to improve safety.
Wherein common electrostatic spinning process can be used in electrostatic spinning, such as solution method of electrostatic spinning, polymer melting electrostatic
Spin processes etc., preferably the latter, because the latter does not need solvent, and obtained fiber is thinner, efficient, at low cost.
In the prior art, ceramic layer or inorganic particle layer are combined with base material frequently with adhesive, in the present invention in base material
Middle introducing functional group, with the associativity of enhancing base materials and inorganic particle layer, without using binder.
Porous layer is made of inorganic particulate and water-soluble polymer, can assign porous layer closing function, further increases peace
Quan Xing.
Following embodiment will be helpful to those skilled in the art and further understand the present invention, but not in any form
The limitation present invention.
Embodiment 1
(1) base material is prepared：The mixture of poly (arylene ether nitrile) and polyvinyl alcohol is sent into extruder, is squeezed out, is drawn with molten condition
Enter high pressure syringe pump, molten mass is made to enter electrostatic spinning nozzle, under the promotion of electric field and injection pump pressure, prepares non-woven fabrics fibre
Tie up layer, 15 microns of thickness；
(2) substrate modifications：Obtained non-woven fabrics fiber layer is heated to 150 DEG C, then with the rate of temperature fall of 10 DEG C/min
It is cooled fast to room temperature, is then irradiated by surface physics and introduces functional group, functional group is hydroxyl；
(3) coating inorganic particle layer：Nano-titanium dioxide is mixed with ethyl alcohol, dispersion liquid is made, is then coated in above-mentioned
Base material side then removes ethyl alcohol, 7 microns of inorganic particulate layer thickness；
(4) porous layer is formed：Nano-titanium dioxide is mixed with carboxymethyl cellulose and deionized water, forms slurry,
It is coated on the another side and above-mentioned ceramic layer of above-mentioned base material, removes above-mentioned solvent, to form porous layer, porous layer thickness 5
Micron；
To form lithium-ion-power cell composite diaphragm.
Embodiment 2
(1) base material is prepared：The mixture of poly (arylene ether nitrile) and polyvinyl alcohol is sent into extruder, is squeezed out, is drawn with molten condition
Enter high pressure syringe pump, molten mass is made to enter electrostatic spinning nozzle, under the promotion of electric field and injection pump pressure, prepares non-woven fabrics fibre
Tie up layer, 15 microns of thickness；
(2) substrate modifications：Obtained non-woven fabrics fiber layer is heated to 170 DEG C, then with the rate of temperature fall of 12 DEG C/min
It is cooled fast to room temperature, is then irradiated by surface physics and introduces functional group, functional group is hydroxyl；
(3) coating inorganic particle layer：Nano-titanium dioxide is mixed with ethyl alcohol, dispersion liquid is made, is then coated in above-mentioned
Base material side then removes ethyl alcohol, 7 microns of inorganic particulate layer thickness；
(4) porous layer is formed：Nano-titanium dioxide is mixed with carboxymethyl cellulose and deionized water, forms slurry,
It is coated on the another side and above-mentioned ceramic layer of above-mentioned base material, removes above-mentioned solvent, to form porous layer, porous layer thickness 5
Micron；
To form lithium-ion-power cell composite diaphragm.
Embodiment 3
(1) base material is prepared：The mixture of poly (arylene ether nitrile) and polyvinyl alcohol is sent into extruder, is squeezed out, is drawn with molten condition
Enter high pressure syringe pump, molten mass is made to enter electrostatic spinning nozzle, under the promotion of electric field and injection pump pressure, prepares non-woven fabrics fibre
Tie up layer；
(2) substrate modifications：Obtained non-woven fabrics fiber layer is heated to 190 DEG C, then with the rate of temperature fall of 15 DEG C/min
It is cooled fast to room temperature, is then irradiated by surface physics and introduces functional group, functional group is hydroxyl；
(3) coating inorganic particle layer：Nano-titanium dioxide is mixed with ethyl alcohol, dispersion liquid is made, is then coated in above-mentioned
Base material side, then removes ethyl alcohol；
(4) porous layer is formed：Nano-titanium dioxide is mixed with carboxymethyl cellulose and deionized water, forms slurry,
It is coated on the another side and above-mentioned ceramic layer of above-mentioned base material, removes above-mentioned solvent, to form porous layer；
To form lithium-ion-power cell composite diaphragm.
Comparative example 1
As a comparison with porous polypropylene diaphragm in the prior art, 28 microns of membrane thicknesses, porosity 50%, to pass
It is prepared by drawing process of uniting.
The closed pore temperature of 1 septation of testing example 1-3 and comparative example, and respectively at 150 DEG C, 170 DEG C, 200 DEG C
The lower percent thermal shrinkage for being kept for 1 hour, the results are shown in Table 1.
Table 1
It can be seen that the closed pore temperature of 1-3 of the embodiment of the present invention is apparently higher than comparative example 1, percent thermal shrinkage is also significantly better than
Comparative example 1, shrinking percentage of the diaphragm at 150 DEG C in comparative example 1 have had reached 26%, have been ruptured at 170 DEG C, and real
The percent thermal shrinkage for applying a 1-3 is significantly lower than comparative example 1, and is not still ruptured at 200 DEG C, shows that its broken film temperature is far high
In comparative example 1, and it is larger with the difference of the closed pore temperature of itself.
Claims (7)
1. a kind of manufacturing method of lithium-ion-power cell composite diaphragm, it is characterised in that：The manufacturing method includes following
Step：
(1) base material is prepared：Non-woven fabrics fiber layer is made by electrostatic spinning process in the mixture of poly (arylene ether nitrile) and polyvinyl alcohol；
(2) substrate modifications：Obtained non-woven fabrics fiber layer is heated to 150-190 DEG C, is then cooled fast to room temperature, it is then logical
It crosses surface physics irradiation or surface chemistry oxidizing process introduces functional group, functional group is hydroxyl, amino, sulfonic group, epoxy group or carboxylic
Base；
(3) coating inorganic particle layer：Inorganic particulate A is mixed with ethyl alcohol, dispersion liquid is made, is then coated in above-mentioned base material one
Side then removes ethyl alcohol；
(4) porous layer is formed：Inorganic particulate B is mixed with water-soluble polymer and solvent, slurry is formed, is coated on above-mentioned base
On the another side of material and above-mentioned ceramic layer, above-mentioned solvent is removed, to form porous layer；
To form above-mentioned composite diaphragm.
2. such as above-mentioned manufacturing method described in claim 1, which is characterized in that in step 1, poly (arylene ether nitrile) accounts for total weight of the mixture
80-95%, polyvinyl alcohol accounts for the 5-10% of total weight of the mixture.
3. such as above-mentioned manufacturing method described in claim 1, which is characterized in that the rate of temperature fall in step 2 is 10-15 DEG C/
min。
4. such as above-mentioned manufacturing method described in claim 1, which is characterized in that above-mentioned inorganic particulate A is nano silicon dioxide, receives
Rice aluminium oxide or nano-titanium dioxide, average grain diameter are 10-15 nanometers.
5. such as above-mentioned manufacturing method described in claim 1, which is characterized in that above-mentioned inorganic particulate B is nano silicon dioxide, receives
Rice aluminium oxide or nano-titanium dioxide, average grain diameter are 18-25 nanometers.
6. such as above-mentioned manufacturing method described in claim 1, which is characterized in that the water-soluble polymer in step 4 is carboxymethyl
Cellulose, hydroxyethyl cellulose, POLYPROPYLENE GLYCOL or polyvinylpyrrolidone.
7. a kind of lithium-ion-power cell, including anode, cathode and diaphragm between the two, the diaphragm is by claim 1-6
The manufacturing method is made.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810504179.2A CN108807788B (en) | 2018-05-24 | 2018-05-24 | Composite diaphragm for lithium ion power battery and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810504179.2A CN108807788B (en) | 2018-05-24 | 2018-05-24 | Composite diaphragm for lithium ion power battery and preparation method thereof |
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| CN108807788A true CN108807788A (en) | 2018-11-13 |
| CN108807788B CN108807788B (en) | 2020-12-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787038A (en) * | 2021-02-20 | 2021-05-11 | 天津谦同新能源科技有限公司 | Post-treatment method of lithium ion battery spinning diaphragm and spinning diaphragm |
| CN114865226A (en) * | 2022-05-25 | 2022-08-05 | 齐齐哈尔大学 | Preparation method and application of MXene-based inorganic particle/PVDF-based polymer composite diaphragm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103474610A (en) * | 2013-09-29 | 2013-12-25 | 天津工业大学 | Method for preparing composite lithium-ion battery separator through electrostatic spinning/electrostatic spraying |
| US20160164059A1 (en) * | 2014-12-08 | 2016-06-09 | Samsung Sdi Co., Ltd. | Composite separator for lithium secondary battery, and lithium secondary battery using the composite separator |
| JP2016170974A (en) * | 2015-03-12 | 2016-09-23 | ニッポン高度紙工業株式会社 | Separator for alkaline battery and alkaline battery |
| CN107248562A (en) * | 2017-06-27 | 2017-10-13 | 过春明 | A kind of lithium ion battery separator and preparation method thereof |
| US20180043656A1 (en) * | 2017-09-18 | 2018-02-15 | LiSo Plastics, L.L.C. | Oriented Multilayer Porous Film |
-
2018
- 2018-05-24 CN CN201810504179.2A patent/CN108807788B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474610A (en) * | 2013-09-29 | 2013-12-25 | 天津工业大学 | Method for preparing composite lithium-ion battery separator through electrostatic spinning/electrostatic spraying |
| US20160164059A1 (en) * | 2014-12-08 | 2016-06-09 | Samsung Sdi Co., Ltd. | Composite separator for lithium secondary battery, and lithium secondary battery using the composite separator |
| JP2016170974A (en) * | 2015-03-12 | 2016-09-23 | ニッポン高度紙工業株式会社 | Separator for alkaline battery and alkaline battery |
| CN107248562A (en) * | 2017-06-27 | 2017-10-13 | 过春明 | A kind of lithium ion battery separator and preparation method thereof |
| US20180043656A1 (en) * | 2017-09-18 | 2018-02-15 | LiSo Plastics, L.L.C. | Oriented Multilayer Porous Film |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112787038A (en) * | 2021-02-20 | 2021-05-11 | 天津谦同新能源科技有限公司 | Post-treatment method of lithium ion battery spinning diaphragm and spinning diaphragm |
| CN114865226A (en) * | 2022-05-25 | 2022-08-05 | 齐齐哈尔大学 | Preparation method and application of MXene-based inorganic particle/PVDF-based polymer composite diaphragm |
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| CN108807788B (en) | 2020-12-22 |
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Inventor after: Zhong Xuhang Inventor after: Li Cuizhi Inventor before: Li Cuizhi |
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Effective date of registration: 20201202 Address after: No. 1056, Tangbian, Jishan village, Xingtai Development Zone, Changtai County, Zhangzhou City, Fujian Province Applicant after: Zhong Xuhang Address before: 315040 No. 002, No. 305, Jiangnan Yi Pin garden, Ningbo high tech Zone, Zhejiang, 6-7 Applicant before: NINGBO GECHUANG NEW MATERIAL TECHNOLOGY Co.,Ltd. |
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