CN109216630A - A kind of high performance lithium ion battery composite diaphragm production method - Google Patents
A kind of high performance lithium ion battery composite diaphragm production method Download PDFInfo
- Publication number
- CN109216630A CN109216630A CN201810990784.5A CN201810990784A CN109216630A CN 109216630 A CN109216630 A CN 109216630A CN 201810990784 A CN201810990784 A CN 201810990784A CN 109216630 A CN109216630 A CN 109216630A
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- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- high performance
- composite diaphragm
- production method
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- 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
-
- 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 production methods of high performance lithium ion battery composite diaphragm, water intaking, ptfe emulsion and inorganic binder mixing first, then high-speed stirred is uniform obtains polytetrafluoroethyldispersion dispersion, wherein, the volume ratio of water, ptfe emulsion and binder is 1.5-2.0:1.0-2.0:0.15-0.5；Then appropriate polytetrafluoroethyldispersion dispersion is taken, inorganic filler powder is added, 0.2-4h is mixed, obtains coating paste；Finally coating paste is uniformly coated on polypropylene screen, is coated with the diaphragm of completion by the dry winding of drying box.The present invention has the advantages that production cost is low, and the composite diaphragm made has the advantages that high-intensitive, lower shrinkage is good.
Description
Technical field
The present invention relates to lithium ion battery separator field, the production of specifically a kind of high performance lithium ion battery composite diaphragm
Method.
Background technique
Compared with traditional wet process film, dry method diaphragm has benefited from process reduction, and the production efficiency and qualification rate of diaphragm are high, because
This has natural cost advantage, but is greatly lowered after dry method diaphragm has done thin, in intensity and double drawing diaphragm retracts rates are big
Will lead to lithium battery has a safety risks, therefore how production cost is low, high-intensitive with low-shrinkage energy, dystectic diaphragm material
Material subsidizes epoch important research direction after becoming.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of production method of high performance lithium ion battery composite diaphragm, tools
The composite diaphragm for having the advantages that production cost is low, and making has the advantages that high-intensitive, lower shrinkage is good.
The technical solution of the present invention is as follows:
A kind of production method of high performance lithium ion battery composite diaphragm, includes following steps:
(1), water intaking, ptfe emulsion and inorganic binder mixing, then high-speed stirred is uniform that polytetrafluoroethylene (PTFE) disperses
Liquid, wherein the volume ratio of water, ptfe emulsion and binder is 1.5-2.0:1.0-2.0:0.15-0.5；
(2), appropriate polytetrafluoroethyldispersion dispersion is taken, inorganic filler powder is added, 0.2-4h is mixed, obtains coating slurry
Material；
(3), coating paste is uniformly coated on polypropylene screen, is coated with the diaphragm of completion by the dry winding of drying box.
Solid content in the ptfe emulsion is in 10-80%.
The speed of step (1) the high speed stirring is 50-500r/min, mixing time 0.2-5h.
The inorganic filler powder selects MgO, SiO2、Al2O3、ZnO、ZrO2、TiO2、BaTiO3、LiAlO2With
LiAg4I5One of or a variety of mixing.
The inorganic binder selects one of polyacrylic acid, polyethyl acrylate, polyvinyl alcohol and butadiene-styrene rubber
Or a variety of mixing.
The polypropylene screen is using the double drawing process manufactures of dry method, thickness 3 -25 um。
The coating paste is uniformly coated on polypropylene screen using rotogravure application, bar coating, dip-coating or spraying method
One or both sides on, total coating thickness 1-15um。
In the step (3), the drying temperature in drying box is 60-95 DEG C, is coated with walking speed 2-40 m/min, dry mark
Standard is the moisture of diaphragm lower than 1500ppm.
Advantages of the present invention are as follows:
The present invention prepares dispersion liquid using ptfe emulsion, and polytetrafluoroethylene PTFE has that intensity is big, good insulating properties,
Polypropylene diaphragm surface coat a strata tetrafluoroethene, improve PP it is bis- drawing diaphragms do it is thin after intensity deficiency problem.Poly-
It is mixed into inorganic adhesive and inorganic filler in tetrafluoroethene lotion, on the one hand can reduce the dosage of polytetrafluoroethylene (PTFE), it is another
Aspect plays the role of assisting pore-forming, simultaneously because the presence of inorganic filler, the diaphragm after being made can preferably absorb electrolysis
Liquid improves discharge rate, and high temperature resistance with higher and better mechanical stability.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
A kind of production method of high performance lithium ion battery composite diaphragm, includes following steps:
(1), 2.0L water, 20wt% ptfe emulsion 1.0L and polyacrylic acid inorganic binder 0.18L mixing are taken, is then existed
1h is stirred under 100r/min revolving speed obtains polytetrafluoroethyldispersion dispersion；
(2), appropriate polytetrafluoroethyldispersion dispersion is taken, Al is added2O3Powder is mixed 2h, obtains coating paste；
(3), coating paste is uniformly coated on 14 uThe single side of m polypropylene screen, coating layer thickness 4um, the diaphragm for being coated with completion are set
It is dried in drying box and at 70 DEG C, is coated with 5 m/min of walking speed, the composite diaphragm that moisture is 785ppm is made.
Embodiment 2
A kind of production method of high performance lithium ion battery composite diaphragm, includes following steps:
(1), 1.5L water, 30wt% ptfe emulsion 1.5L and polyacrylic acid inorganic binder 0.28L mixing are taken, is then existed
0.5h is stirred under 200r/min revolving speed obtains polytetrafluoroethyldispersion dispersion；
(2), appropriate polytetrafluoroethyldispersion dispersion is taken, SiO is added2Powder is mixed 2h, obtains coating paste；
(3), coating paste is uniformly coated on 16 uThe single side of m polypropylene screen, coating layer thickness 4um, the diaphragm for being coated with completion are set
It is dried in drying box and at 75 DEG C, is coated with 10 m/min of walking speed, the composite diaphragm that moisture is 850ppm is made.
Embodiment 3
A kind of production method of high performance lithium ion battery composite diaphragm, includes following steps:
(1), 1.5L water, 40wt% ptfe emulsion 2.0L and polyacrylic acid inorganic binder 0.4L mixing are taken, is then existed
0.5h is stirred under 200r/min revolving speed obtains polytetrafluoroethyldispersion dispersion；
(2), appropriate polytetrafluoroethyldispersion dispersion is taken, TiO is added2Powder is mixed 2h, obtains coating paste；
(3), coating paste is uniformly coated on 20 uM polypropylene screen it is two-sided, coated on both sides thickness is 2um, coating complete
Diaphragm be placed in drying box and be dried at 75 DEG C, be coated with 10 m/min of walking speed, be made moisture 785ppm it is compound every
Film.
Tensile strength test is carried out together with common polypropylene screen to the composite diaphragm of embodiment 1-3 production, is heat-shrinked
Rate test and ionic conductivity test, tensile strength, percent thermal shrinkage and the ion of the composite diaphragm of 1-3 of embodiment of the present invention production
Conductivity is both significantly higher than common polypropylene screen.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of production method of high performance lithium ion battery composite diaphragm, it is characterised in that: include following steps:
(1), water intaking, ptfe emulsion and inorganic binder mixing, then high-speed stirred is uniform that polytetrafluoroethylene (PTFE) disperses
Liquid, wherein the volume ratio of water, ptfe emulsion and binder is 1.5-2.0:1.0-2.0:0.15-0.5；
(2), appropriate polytetrafluoroethyldispersion dispersion is taken, inorganic filler powder is added, 0.2-4h is mixed, obtains coating slurry
Material；
(3), coating paste is uniformly coated on polypropylene screen, is coated with the diaphragm of completion by the dry winding of drying box.
2. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
The solid content in ptfe emulsion stated is in 10-80%.
3. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
The speed of the step of stating (1) high speed stirring is 50-500r/min, mixing time 0.2-5h.
4. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
The inorganic filler powder stated selects MgO, SiO2、Al2O3、ZnO、ZrO2、TiO2、BaTiO3、LiAlO2And LiAg4I5In one
Kind or a variety of mixing.
5. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
The inorganic binder stated selects one of polyacrylic acid, polyethyl acrylate, polyvinyl alcohol and butadiene-styrene rubber or a variety of mixed
It closes.
6. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
The polypropylene screen stated is using the double drawing process manufactures of dry method, thickness 3 -25 um。
7. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
The coating paste stated is uniformly coated on the one side or two of polypropylene screen using rotogravure application, bar coating, dip-coating or spraying method
On face, total coating thickness 1-15um。
8. a kind of production method of high performance lithium ion battery composite diaphragm according to claim 1, it is characterised in that: institute
In the step of stating (3), the drying temperature in drying box is 60-95 DEG C, is coated with walking speed 2-40 m/min, dry standard is diaphragm
Moisture is lower than 1500ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810990784.5A CN109216630A (en) | 2018-08-28 | 2018-08-28 | A kind of high performance lithium ion battery composite diaphragm production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810990784.5A CN109216630A (en) | 2018-08-28 | 2018-08-28 | A kind of high performance lithium ion battery composite diaphragm production method |
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| CN109216630A true CN109216630A (en) | 2019-01-15 |
Family
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| CN201810990784.5A Pending CN109216630A (en) | 2018-08-28 | 2018-08-28 | A kind of high performance lithium ion battery composite diaphragm production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117559A (en) * | 2022-06-30 | 2022-09-27 | 中材锂膜有限公司 | Coating slurry of battery diaphragm, preparation method of coating slurry, battery diaphragm and lithium ion battery |
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| CN103579556A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN103579551A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN104064712A (en) * | 2014-07-10 | 2014-09-24 | 厦门大学 | Method for selecting lithium ion battery ceramic diaphragm bonding agent |
| CN104064713A (en) * | 2014-07-10 | 2014-09-24 | 厦门大学 | Composite diaphragm as well as preparation method and application thereof |
| CN104600230A (en) * | 2014-12-12 | 2015-05-06 | 深圳中兴创新材料技术有限公司 | Battery diaphragm and application thereof |
| CN105070867A (en) * | 2015-07-17 | 2015-11-18 | 普天新能源（深圳）有限公司 | Composite diaphragm and preparation method thereof and lithium ion battery |
| CN105762317A (en) * | 2016-01-19 | 2016-07-13 | 合肥工业大学 | Water-soluble polymer assisted inorganic composite diaphragm preparation method |
| CN106229447A (en) * | 2016-08-10 | 2016-12-14 | 东莞永蓝电子科技有限公司 | A kind of lithium ion battery |
-
2018
- 2018-08-28 CN CN201810990784.5A patent/CN109216630A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103579556A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN103579551A (en) * | 2012-07-24 | 2014-02-12 | 海洋王照明科技股份有限公司 | Electrochemical power-supply composite membrane and preparation method thereof |
| CN104064712A (en) * | 2014-07-10 | 2014-09-24 | 厦门大学 | Method for selecting lithium ion battery ceramic diaphragm bonding agent |
| CN104064713A (en) * | 2014-07-10 | 2014-09-24 | 厦门大学 | Composite diaphragm as well as preparation method and application thereof |
| CN104600230A (en) * | 2014-12-12 | 2015-05-06 | 深圳中兴创新材料技术有限公司 | Battery diaphragm and application thereof |
| CN105070867A (en) * | 2015-07-17 | 2015-11-18 | 普天新能源（深圳）有限公司 | Composite diaphragm and preparation method thereof and lithium ion battery |
| CN105762317A (en) * | 2016-01-19 | 2016-07-13 | 合肥工业大学 | Water-soluble polymer assisted inorganic composite diaphragm preparation method |
| CN106229447A (en) * | 2016-08-10 | 2016-12-14 | 东莞永蓝电子科技有限公司 | A kind of lithium ion battery |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115117559A (en) * | 2022-06-30 | 2022-09-27 | 中材锂膜有限公司 | Coating slurry of battery diaphragm, preparation method of coating slurry, battery diaphragm and lithium ion battery |
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Application publication date: 20190115 |