CN109244320A - A kind of secure high performance lithium ion battery separator and preparation method thereof - Google Patents
A kind of secure high performance lithium ion battery separator and preparation method thereof Download PDFInfo
- Publication number
- CN109244320A CN109244320A CN201811082681.5A CN201811082681A CN109244320A CN 109244320 A CN109244320 A CN 109244320A CN 201811082681 A CN201811082681 A CN 201811082681A CN 109244320 A CN109244320 A CN 109244320A
- Authority
- CN
- China
- Prior art keywords
- lithium ion
- ion battery
- high performance
- battery separator
- performance lithium
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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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
-
- 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
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
-
- 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 belongs to battery diaphragm processing technique field and disclose a kind of secure high performance lithium ion battery separator and preparation method thereof, lithium ion battery separator includes polypropylene microporous basement membrane, and by coating process coating in the coating layer of the polypropylene microporous membrane surface, the material of the coating layer is ceramic slurry；A kind of manufacturing method of secure high performance lithium ion battery separator, diameter 100~200nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, primary stirring, sodium cellulose glycolate aqueous solution is added, simultaneously ultra-high molecular weight polyethylene is added in secondary agitation, and grinding sequentially adds Kynoar and Sodium Polyacrylate, triple mixing obtains ceramic slurry.The present invention can keep for a long time diaphragm to the wellability of electrolyte, while can promote ion-exchange capacity, and the mechanical strength of diaphragm can be improved, and enhance diaphragm, promote safety, be avoided that cutting burr bring security risk in four side coated polymer layer of diaphragm.
Description
Technical field
Present invention relates particularly to a kind of secure high performance lithium ion battery separators and preparation method thereof, belong to battery diaphragm and add
Work technical field.
Background technique
With the fast development of information age, the high speed development of portable power is also following.In recent years, people are to electronics
More stringent requirements are proposed for product, such as the super long standby time time of mobile phone electronic equipment；Hybrid vehicle, electric car etc. are green
Color energy source and power equipment is popularized；The popularization of home-use, business storage electric system.Therefore there is high gravimetric energy density and volume
The lithium ion secondary battery of energy density is more paid close attention to, especially large capacity, the high-performance lithium electricity that can be quickly charged and discharged
Pond is more favored, but should be obtained further with the problems such as this bring safety problem, especially batteries caught fire, battery explosion
Pay attention to.
Lithium battery is mainly made of anode, cathode, diaphragm three parts.The performance of lithium battery diaphragm directly affects battery
Internal resistance, interfacial structure, capacity, cycle performance, safety etc..Currently, common diaphragm material is mainly the poly- second of polyolefins
Alkene or polypropylene, such high molecular material have the advantage of its own as battery diaphragm, such as excellent electrical insulator, can prevent by
Electronics penetrates the decline for leading to battery capacity, and performance is stablized, excellent processing performance etc..
For polyolefins diaphragm there are still more defect, it is biaxial stretch-formed to compare wet process for the polyalkene diaphragm that dry method is uniaxially stretched
Diaphragm is easier to be heat-shrinked, and experiment confirms that the diaphragm being uniaxially stretched is handled 4 hours at 85 DEG C, and shrinking percentage is more than 1%；In big function
In rate discharge process, battery local temperature rises rapidly, and when temperature melts starting point close to diaphragm, thermal contraction can make positive and negative anodes
Piece contact, the heat of moment is huge potential danger；Polyalkene diaphragm itself has hydrophobicity, infiltration of the diaphragm to electrolyte
Property is poor with liquid retention；The long-term charge and discharge process septation of battery should be stable be in positive and negative interpolar, small poor contact
The increase that will lead to internal resistance, causes diaphragm puncture；Surface resistance can reduce ion mobility, increase during high current charge-discharge
Big energy loss.
Summary of the invention
The technical problem to be solved in the present invention overcomes existing defect, provides a kind of secure high performance lithium ion battery separator
And preparation method thereof, diaphragm can be kept for a long time to the wellability of electrolyte, while ion-exchange capacity can be promoted, can be improved every
The mechanical strength of film, moreover it is possible to the dendritic growth of lithium metal can be inhibited using the small layer in aperture, it is possible thereby to inhibit charge and discharge
The kindling of internal short-circuit and accompanying this when electric enhances diaphragm, promotes safety, is avoided that in four side coated polymer layer of diaphragm
Burr bring security risk is cut, the problems in background technique can be effectively solved.
In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions:
The present invention provides a kind of secure high performance lithium ion battery separator, including polypropylene microporous basement membrane, and passes through coating process
It is coated on the coating layer of the polypropylene microporous membrane surface, the material of the coating layer is ceramic slurry.
As a preferred technical solution of the present invention, poly- first is coated between the polypropylene microporous basement membrane and coating layer
Base methyl acrylate binder.
As a preferred technical solution of the present invention, the super high molecular weight that 6wt% is adulterated in the material of the coating layer is poly-
Ethylene.
As a preferred technical solution of the present invention, the coating layer with a thickness of 1~8 micron.
A kind of method for manufacturing secure high performance lithium ion battery separator, includes the following steps:
Step 1: diameter 100~200nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, it is primary to stir,
Sodium cellulose glycolate aqueous solution is added, simultaneously ultra-high molecular weight polyethylene is added in secondary agitation, grinds, sequentially adds polyvinylidene fluoride
Alkene and Sodium Polyacrylate, triple mixing obtain ceramic slurry；
Step 2: ceramic slurry is coated on polypropylene microporous basement membrane, first 60 DEG C~80 DEG C 12~14h of vacuum drying, then
Film is put into 100 DEG C~130 DEG C 1~2h of heating of air dry oven, obtains high performance lithium ion battery diaphragm.
As a preferred technical solution of the present invention, the whipping temp in the step 1 maintains 50 DEG C~80 DEG C, stirring
Under make solution homogeneous transparent.
As a preferred technical solution of the present invention, nitrogen is passed through in the step 1 in the whole process.
The beneficial effects obtained by the present invention are as follows being: diaphragm can be kept for a long time to the wellability of electrolyte, while can promote from
The mechanical strength of diaphragm can be improved in sub- exchange capacity, moreover it is possible to can inhibit the dendroid of lithium metal using the small layer in aperture
Growth enhances diaphragm it is possible thereby to inhibit the kindling of internal short-circuit and accompanying this when charge and discharge, safety is promoted, in diaphragm
Four side coated polymer layers are avoided that cutting burr bring security risk.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described, it should be understood that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1:
A kind of secure high performance lithium ion battery separator of the present invention, including polypropylene microporous basement membrane, and pass through coating process coating
In the coating layer of the polypropylene microporous membrane surface, the material of the coating layer is ceramic slurry.
Further, polymethyl methacrylate binder is coated between the polypropylene microporous basement membrane and coating layer.
Further, the ultra-high molecular weight polyethylene of 6wt% is adulterated in the material of the coating layer.
Further, the coating layer with a thickness of 3 microns.
A kind of method for manufacturing secure high performance lithium ion battery separator, includes the following steps:
Step 1: diameter 100nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, it is primary to stir, it is added
Simultaneously ultra-high molecular weight polyethylene is added in sodium cellulose glycolate aqueous solution, secondary agitation, grinding, sequentially add Kynoar and
Sodium Polyacrylate, triple mixing obtain ceramic slurry；
Step 2: ceramic slurry is coated on polypropylene microporous basement membrane, first 60 DEG C of vacuum drying 12h, are then put into drum for film
100 DEG C of heating 1h of wind drying box, obtain high performance lithium ion battery diaphragm.
Further, the whipping temp in the step 1 maintains 50 DEG C, and solution homogeneous transparent is made under stirring.
Further, it to be passed through nitrogen in the whole process in the step 1.
Embodiment 2:
A kind of secure high performance lithium ion battery separator of the present invention, including polypropylene microporous basement membrane, and pass through coating process coating
In the coating layer of the polypropylene microporous membrane surface, the material of the coating layer is ceramic slurry.
Further, polymethyl methacrylate binder is coated between the polypropylene microporous basement membrane and coating layer.
Further, the ultra-high molecular weight polyethylene of 6wt% is adulterated in the material of the coating layer.
Further, the coating layer with a thickness of 5 microns.
A kind of method for manufacturing secure high performance lithium ion battery separator, includes the following steps:
Step 1: diameter 150nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, it is primary to stir, it is added
Simultaneously ultra-high molecular weight polyethylene is added in sodium cellulose glycolate aqueous solution, secondary agitation, grinding, sequentially add Kynoar and
Sodium Polyacrylate, triple mixing obtain ceramic slurry；
Step 2: ceramic slurry is coated on polypropylene microporous basement membrane, first 63 DEG C of vacuum drying 13h, are then put into drum for film
110 DEG C of heating 1.5h of wind drying box, obtain high performance lithium ion battery diaphragm.
Further, the whipping temp in the step 1 maintains 60 DEG C, and solution homogeneous transparent is made under stirring.
Further, it to be passed through nitrogen in the whole process in the step 1.
Embodiment 3:
A kind of secure high performance lithium ion battery separator of the present invention, including polypropylene microporous basement membrane, and pass through coating process coating
In the coating layer of the polypropylene microporous membrane surface, the material of the coating layer is ceramic slurry.
As a preferred technical solution of the present invention, poly- first is coated between the polypropylene microporous basement membrane and coating layer
Base methyl acrylate binder.
As a preferred technical solution of the present invention, the super high molecular weight that 6wt% is adulterated in the material of the coating layer is poly-
Ethylene.
As a preferred technical solution of the present invention, the coating layer with a thickness of 6 microns.
A kind of method for manufacturing secure high performance lithium ion battery separator, includes the following steps:
Step 1: diameter 180nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, it is primary to stir, it is added
Simultaneously ultra-high molecular weight polyethylene is added in sodium cellulose glycolate aqueous solution, secondary agitation, grinding, sequentially add Kynoar and
Sodium Polyacrylate, triple mixing obtain ceramic slurry；
Step 2: ceramic slurry is coated on polypropylene microporous basement membrane, first 70 DEG C of vacuum drying 13h, are then put into drum for film
120 DEG C of heating 11.8h of wind drying box, obtain high performance lithium ion battery diaphragm.
Further, the whipping temp in the step 1 maintains 70 DEG C, and solution homogeneous transparent is made under stirring.
Further, it to be passed through nitrogen in the whole process in the step 1.
Embodiment 4:
A kind of secure high performance lithium ion battery separator of the present invention, including polypropylene microporous basement membrane, and pass through coating process coating
In the coating layer of the polypropylene microporous membrane surface, the material of the coating layer is ceramic slurry.
Further, polymethyl methacrylate binder is coated between the polypropylene microporous basement membrane and coating layer.
Further, the ultra-high molecular weight polyethylene of 6wt% is adulterated in the material of the coating layer.
Further, the coating layer with a thickness of 8 microns.
A kind of method for manufacturing secure high performance lithium ion battery separator, includes the following steps:
Step 1: diameter 200nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, it is primary to stir, it is added
Simultaneously ultra-high molecular weight polyethylene is added in sodium cellulose glycolate aqueous solution, secondary agitation, grinding, sequentially add Kynoar and
Sodium Polyacrylate, triple mixing obtain ceramic slurry；
Step 2: ceramic slurry is coated on polypropylene microporous basement membrane, first 80 DEG C of vacuum drying 14h, are then put into drum for film
130 DEG C of heating 2h of wind drying box, obtain high performance lithium ion battery diaphragm.
Further, the whipping temp in the step 1 maintains 80 DEG C, and solution homogeneous transparent is made under stirring.
Further, it to be passed through nitrogen in the whole process in the step 1.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of secure high performance lithium ion battery separator, it is characterised in that: including polypropylene microporous basement membrane, and pass through coating work
Skill is coated on the coating layer of the polypropylene microporous membrane surface, and the material of the coating layer is ceramic slurry.
2. a kind of secure high performance lithium ion battery separator as described in claim 1, it is characterised in that: the polypropylene microporous
Polymethyl methacrylate binder is coated between basement membrane and coating layer.
3. a kind of secure high performance lithium ion battery separator as described in claim 1, it is characterised in that: the material of the coating layer
The ultra-high molecular weight polyethylene of 6wt% is adulterated in material.
4. a kind of secure high performance lithium ion battery separator as described in claim 1, it is characterised in that: the thickness of the coating layer
Degree is 1~8 micron.
5. the method for manufacturing a kind of secure high performance lithium ion battery separator as described in benefit requires 1~4, it is characterised in that: packet
Include following steps:
Step 1: diameter 100~200nm hydrophobic nano titanium dioxide ceramic particle is mixed with deionized water, it is primary to stir,
Sodium cellulose glycolate aqueous solution is added, simultaneously ultra-high molecular weight polyethylene is added in secondary agitation, grinds, sequentially adds polyvinylidene fluoride
Alkene and Sodium Polyacrylate, triple mixing obtain ceramic slurry；
Step 2: ceramic slurry is coated on polypropylene microporous basement membrane, first 60 DEG C~80 DEG C 12~14h of vacuum drying, then
Film is put into 100 DEG C~130 DEG C 1~2h of heating of air dry oven, obtains high performance lithium ion battery diaphragm.
6. manufacturing a kind of method of secure high performance lithium ion battery separator as claimed in claim 5, it is characterised in that: described
Whipping temp in step 1 maintains 50 DEG C~80 DEG C, and solution homogeneous transparent is made under stirring.
7. manufacturing a kind of method of secure high performance lithium ion battery separator as claimed in claim 5, it is characterised in that: described
Nitrogen is passed through in step 1 in the whole process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082681.5A CN109244320A (en) | 2018-09-17 | 2018-09-17 | A kind of secure high performance lithium ion battery separator and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811082681.5A CN109244320A (en) | 2018-09-17 | 2018-09-17 | A kind of secure high performance lithium ion battery separator and preparation method thereof |
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| CN109244320A true CN109244320A (en) | 2019-01-18 |
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ID=65058129
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| CN201811082681.5A Pending CN109244320A (en) | 2018-09-17 | 2018-09-17 | A kind of secure high performance lithium ion battery separator and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243213A (en) * | 2021-11-15 | 2022-03-25 | 华南理工大学 | Ultrathin high-strength multilayer composite diaphragm with high-load ceramic particles and preparation method thereof |
| CN114709559A (en) * | 2022-03-29 | 2022-07-05 | 中材锂膜(宁乡)有限公司 | Lithium ion battery diaphragm, preparation method thereof and winding battery cell |
| CN114784454A (en) * | 2022-06-17 | 2022-07-22 | 宁波长阳科技股份有限公司 | High-temperature-resistant polyolefin microporous membrane and preparation method thereof |
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Application publication date: 20190118 |