CN108428838A - A kind of preparation method of cell safety diaphragm - Google Patents
A kind of preparation method of cell safety diaphragm Download PDFInfo
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- CN108428838A CN108428838A CN201810159308.9A CN201810159308A CN108428838A CN 108428838 A CN108428838 A CN 108428838A CN 201810159308 A CN201810159308 A CN 201810159308A CN 108428838 A CN108428838 A CN 108428838A
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- Prior art keywords
- preparation
- diaphragm
- cell safety
- safety diaphragm
- modified
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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
-
- 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
- H01M50/446—Composite material consisting of a mixture of organic and inorganic materials
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Abstract
The invention discloses a kind of preparation method of cell safety diaphragm, step is：Will be imvite modified, then modified montmorillonoid and matrix are blended, the product of blending is finally prepared into diaphragm；The diaphragm is combined by matrix and modified montmorillonoid；Cell safety diaphragm can once be obtained using this method, and method is simple, there is good generalization；It due to one-pass film-forming so that modified montmorillonoid uniformly exists in diaphragm, improves every film strength and heat resistance so that the safety of diaphragm is improved.
Description
Technical field
The present invention relates to secondary cell fields, more particularly to a kind of lithium system or the system of sodium system cell safety diaphragm
Preparation Method.
Background technology
Diaphragm is placed in the microporous film between battery plus-negative plate, and ion can pass freely through, and electronics cannot pass through, together
When partition positive and negative anodes be in direct contact.In all batteries, diaphragm plays a crucial role.Diaphragm must be good
Insulator, and ion can be made to pass through intrinsic ion channel or dipping electrolyte to dredge ion.
Diaphragm development mainly with battery demand constantly change and continue to develop, high-energy density, large capacity,
The demand of high safety makes the commanding elevation for becoming each contention for the research of safety diaphragm.
Have at present than more conventional blowout disk：Goldschmidt chemical corporation compound Al on cellulosic nonwoven fabric2O3Or other are inorganic
Object；South Korea's LG chemistry coating nano ceramic particle on polyolefin film（BaTiO3）Enhance safety；Hitachi Maxell/ days
Vertical Macrocell is coated with metal oxide microparticle of plate and domestic Shenzhen Xing Yuan companies on polyolefin porous membrane
Using PP diaphragms as matrix, surface coats one layer of nanoscale Al2O3Material.These methods can improve fusing point and melt integrity, but
It is that these methods all inevitably have inorganic matter coating distributing homogeneity, this can cause new problem again（Than
The low appearance of such as battery, cycle life difference and yield rate are low）, and these method processes are more, and process control etc. is complex.
Invention content
The present invention is directed to overcome the defect of existing cell safety diaphragm and preparation method thereof, provide a kind of cell safety every
The preparation method of film, introduce modified montmorillonoid, can while improving battery security simple flow.
To achieve the goals above, specific technical solution is as follows：
A kind of preparation method of cell safety diaphragm, it is characterised in that include the following steps：
It step 1, will be imvite modified；
Step 2, modified montmorillonoid and matrix are blended；
Step 3, the product of step 2 is then prepared into diaphragm.
Montmorillonite described in step 1 is natural montmorillonite, and optimal selection is natural sodium-based montmorillonite.
Modification described in step 1 is added coupling agent modified using intercalation modifying or intercalation modifying.
Matrix described in step 2 includes one of one kind or their compound in PE, PP, PI, non-woven fabrics etc.
Kind.
Blend method described in step 2 is mainly that modified montmorillonoid, matrix are mixed with compatilizer respectively, then again by two
Person mixes.Compatilizer described above refers to one or more of mixing of cyclic acid anhydride type (MAH), carboxylic acid type, oxazoline type
Object more preferably refers to cyclic acid anhydride type (MAH).In above-mentioned several mixed processes, the time of the mixing is no less than
15min, the temperature of the mixing is within the scope of 60 DEG C ~ 300 DEG C.
The content accounting of modified montmorillonoid described in step 2 is 0.1wt% ~ 10wt% of total content after being blended.
Dry process may be used in diaphragm to preparing described in step 3 or prepared by wet method.More preferably, it is to be cooled down,
Diaphragm is suppressed to obtain, then diaphragm is heated to close to melting temperature, carrying out biaxial tension makes molecular chain orientation, finally keeps the temperature a timing
Between, remaining solvent is eluted with volatile substances, the microporous membrane material being mutually communicated can be prepared.
Beneficial effects of the present invention are as follows：
Cell safety diaphragm can once be obtained using the present invention, and step is simple, there is good generalization；Due to primary
Film forming makes modified montmorillonoid uniformly exist in diaphragm, improves every film strength and heat resistance so that the safety of diaphragm
Property is improved.
Specific implementation mode
Below by specific implementation mode, the present invention is further illustrated, but the present invention is not limited to the present embodiment.
Embodiment 1
Natural sodium-based montmorillonite is subjected to intercalation modifying with the agent of octadecyl quaternary ammonium salts, then divides modified montmorillonoid, PE
It does not mix with cyclic acid anhydride type (MAH), then again mixes the two, control modified montmorillonoid content accounting will be produced in 0.5wt%
Diaphragm is made with wet method in object.
Gained diaphragm is made battery to test：
Anode：Active material is NCM532, and content 91%, conductive carbon black content 5%, PVDF4%, 16 μm of aluminium foils, pole piece is thick after cold pressing
138 μm of degree.
Cathode：Active material content of graphite 93%, conductive carbon black content 3%, PVDF4%, 15 μm of copper foils, pole piece is thick after cold pressing
100 μm of degree.
Battery design capacity 2Ah, diaphragm are the diaphragm prepared.
Detection project：Multiplying power test, high-temperature storage test, hot tank, needle thorn.
Embodiment 2
Natural sodium-based montmorillonite is subjected to intercalation modifying with the agent of octadecyl quaternary ammonium salts, is then carried out again with silane coupling agent
It is modified, then modified montmorillonoid, PE are mixed with cyclic acid anhydride type (MAH) respectively, then the two is mixed again, modified cover is controlled and takes off
Diaphragm is made with wet method in 0.5wt%, by product in native content accounting.
Battery makes and detection project is the same as embodiment 1.
Embodiment 3
Natural sodium-based montmorillonite is subjected to intercalation modifying with the agent of octadecyl quaternary ammonium salts, is then carried out again with silane coupling agent
It is modified, then modified montmorillonoid, PE are mixed with cyclic acid anhydride type (MAH) respectively, then the two is mixed again, modified cover is controlled and takes off
Diaphragm is made with wet method in 1.5wt%, by product in native content accounting.
Battery makes and detection project is the same as embodiment 1.
Embodiment 4
Natural sodium-based montmorillonite is subjected to intercalation modifying with the agent of octadecyl quaternary ammonium salts, is then carried out again with silane coupling agent
It is modified, then modified montmorillonoid, PE are mixed with cyclic acid anhydride type (MAH) respectively, then the two is mixed again, modified cover is controlled and takes off
Diaphragm is made with wet method in 3wt%, by product in native content accounting.
Battery makes and detection project is the same as embodiment 1.
Embodiment 5
Natural sodium-based montmorillonite is subjected to intercalation modifying with the agent of octadecyl quaternary ammonium salts, is then carried out again with silane coupling agent
It is modified, then modified montmorillonoid, PI are mixed with cyclic acid anhydride type (MAH) respectively, then the two is mixed again, modified cover is controlled and takes off
Diaphragm is made with wet method in 1.5wt%, by product in native content accounting；
Battery makes and detection project is the same as embodiment 1.
Embodiment 6
Natural sodium-based montmorillonite is subjected to intercalation modifying with the agent of octadecyl quaternary ammonium salts, is then carried out again with silane coupling agent
It is modified, then modified montmorillonoid, PE are mixed with cyclic acid anhydride type (MAH) respectively, then the two is mixed again, modified cover is controlled and takes off
Diaphragm is made with wet method in 10wt%, by product in native content accounting；
Battery makes and detection project is the same as embodiment 1.
Comparative example
Using commercially available wet method PE diaphragms as diaphragm, battery makes and detection project is the same as embodiment 1.
Embodiment and comparative example is all made 10 batteries and is tested, and the results are shown in Table 1.
From test result as can be seen that relative to comparative example, diaphragm provided by the present invention can not significantly change battery times
The security performance of battery in abuse conditions is effectively improved under the premise of rate performance.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (9)
1. a kind of preparation method of cell safety diaphragm, it is characterised in that include the following steps：
It step 1, will be imvite modified；
Step 2, modified montmorillonoid and matrix are blended；
Step 3, the product of step 2 is then prepared into diaphragm.
2. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：Montmorillonite described in step 1
For natural montmorillonite.
3. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：The natural montmorillonite is natural
Sodium-based montmorillonite.
4. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：Modification described in step 1 is adopted
Added with intercalation modifying or intercalation modifying coupling agent modified.
5. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：Matrix packet described in step 2
Include the compound of the one or any combination in PE, PP, PI, non-woven fabrics.
6. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：Blending described in step 2 is
Modified montmorillonite, matrix are mixed with compatilizer respectively, then again mix the two；The time of the mixing is no less than
15min, the temperature of the mixing is within the scope of 60 DEG C ~ 300 DEG C.
7. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：Blending ratio described in step 2
Example is modified montmorillonoid content accounting in 0.1wt% ~ 10wt%.
8. the preparation method of cell safety diaphragm as described in claim 1, it is characterised in that：Preparation packet described in step 3
It includes dry process or is prepared by wet method.
9. the preparation method of cell safety diaphragm as claimed in claim 5, it is characterised in that：The compatilizer refers to cyclic annular acid
One or more mixtures in acid anhydride type, carboxylic acid type, oxazoline type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810159308.9A CN108428838A (en) | 2018-02-26 | 2018-02-26 | A kind of preparation method of cell safety diaphragm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810159308.9A CN108428838A (en) | 2018-02-26 | 2018-02-26 | A kind of preparation method of cell safety diaphragm |
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| CN201810159308.9A Pending CN108428838A (en) | 2018-02-26 | 2018-02-26 | A kind of preparation method of cell safety diaphragm |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797495A (en) * | 2019-09-28 | 2020-02-14 | 合肥国轩高科动力能源有限公司 | High-strength composite PE diaphragm and preparation method thereof |
| CN111180637A (en) * | 2020-01-07 | 2020-05-19 | 四川东为氢源科技有限公司 | Sodium ion battery diaphragm and preparation method and application thereof |
| CN111266020A (en) * | 2020-01-19 | 2020-06-12 | 武汉工程大学 | Montmorillonite separation membrane, preparation method and application thereof, and inductance component |
| WO2023056825A1 (en) * | 2021-10-09 | 2023-04-13 | 宁德时代新能源科技股份有限公司 | Isolation film, secondary battery containing same, and electrical apparatus |
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| CN101412819A (en) * | 2007-10-15 | 2009-04-22 | 西北师范大学 | Method for preparing micropore polymer electrolyte by using glyoxaline cation-intercalated montmorillonite |
| CN101414686A (en) * | 2007-10-17 | 2009-04-22 | 中国科学院大连化学物理研究所 | Compound film and application thereof for high-temperature fuel battery with proton exchange film |
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2018
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| CN101412819A (en) * | 2007-10-15 | 2009-04-22 | 西北师范大学 | Method for preparing micropore polymer electrolyte by using glyoxaline cation-intercalated montmorillonite |
| CN101414686A (en) * | 2007-10-17 | 2009-04-22 | 中国科学院大连化学物理研究所 | Compound film and application thereof for high-temperature fuel battery with proton exchange film |
| EP2535964A2 (en) * | 2011-06-16 | 2012-12-19 | HOPPECKE Batterien GmbH & Co. KG | Accumulator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110797495A (en) * | 2019-09-28 | 2020-02-14 | 合肥国轩高科动力能源有限公司 | High-strength composite PE diaphragm and preparation method thereof |
| CN110797495B (en) * | 2019-09-28 | 2021-08-10 | 合肥国轩高科动力能源有限公司 | High-strength composite PE diaphragm and preparation method thereof |
| CN111180637A (en) * | 2020-01-07 | 2020-05-19 | 四川东为氢源科技有限公司 | Sodium ion battery diaphragm and preparation method and application thereof |
| CN111266020A (en) * | 2020-01-19 | 2020-06-12 | 武汉工程大学 | Montmorillonite separation membrane, preparation method and application thereof, and inductance component |
| CN111266020B (en) * | 2020-01-19 | 2022-03-01 | 武汉工程大学 | Montmorillonite separation membrane, preparation method and application thereof, and inductance component |
| WO2023056825A1 (en) * | 2021-10-09 | 2023-04-13 | 宁德时代新能源科技股份有限公司 | Isolation film, secondary battery containing same, and electrical apparatus |
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Application publication date: 20180821 |
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