CN103072355A - Novel inorganic membrane and preparation method thereof - Google Patents
Novel inorganic membrane and preparation method thereof Download PDFInfo
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- CN103072355A CN103072355A CN2012105673333A CN201210567333A CN103072355A CN 103072355 A CN103072355 A CN 103072355A CN 2012105673333 A CN2012105673333 A CN 2012105673333A CN 201210567333 A CN201210567333 A CN 201210567333A CN 103072355 A CN103072355 A CN 103072355A
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a novel inorganic membrane which comprises an ultrahigh molecular weight polyethylene layer, a low molecular weight polyethylene layer and an aluminum oxide layer, wherein the low molecular weight polyethylene layer is arranged on the ultrahigh molecular weight polyethylene layer; the aluminum oxide layer is arranged on the lower molecular weight polyethylene layer; or the ultrahigh molecular weight polyethylene layer is arranged on the lower molecular weight polyethylene layer; and the aluminum oxide layer is arranged on the ultrahigh molecular weight polyethylene layer. The novel inorganic membrane consists of three layers, so that the performance and the stability of batteries are improved, the safety of the batteries is guaranteed, and an excellent application value is obtained.
Description
Technical field
The invention belongs to polymeric material field, relate in particular to a kind of novel inorganic film and preparation method thereof.
Background technology
Along with the consumption of fossil fuel, the storage of energy and the research of converting apparatus more and more cause people's attention.Lithium ion battery is high owing to energy density, have extended cycle life, self-discharge rate is low etc., and advantage becomes the most noticeable secondary cell.Yet electrokinetic cell and the required main equipment of long-term energy storage require lithium ion battery to possess high rate capability, long-time stability energy and high-temperature behavior etc., and these all are lithium ion battery development problem demanding prompt solutions.In business-like lithium ion battery, be widely used by the polymer nature in polyolefin and the colloidal sol type electrolyte as membrane for polymer, however these organic barrier films exist usually problems such as fusing point is low, bad mechanical strength.Obvious torsional deformation appears in membrane for polymer under higher temperature, under large multiplying power, discharge and recharge and long-time cyclic process in can be pierced through by Li dendrite the problem such as barrier film.Therefore, organic barrier film may cause some potential potential safety hazards.Inorganic material has outstanding heat endurance and electrolyte wetting property, therefore is widely used in the modified polymer barrier film.Membrane for polymer after inorganic material is modified presents better thermodynamic stability, with the battery of its assembling better performance is arranged, and in battery winding assembly, anodic aluminium oxide membrane is not used because pliability is poor.But in prismatic battery and other rigidity battery design, inorganic diaphragm is feasible as barrier film, and using value is arranged very much.With respect to business-like membrane for polymer, anodic aluminium oxide membrane have " absolute " heat endurance, to the high adsorption capacity of electrolyte, can not be by advantages such as Li dendrite pierce through.Because the stability of anodic aluminium oxide membrane material, the large-scale monocell for preparing with the anodic aluminium oxide membrane material will have obviously superior performance than the battery pack that is comprised of a lot of baby batteries.
Summary of the invention
The object of the invention is to utilize at a kind of novel inorganic film and preparation method thereof, be intended to solve existing organic barrier film and have usually that fusing point is low, bad mechanical strength, obvious torsional deformation appears in membrane for polymer under higher temperature, under large multiplying power, discharge and recharge and long-time cyclic process in can be pierced through by Li dendrite the problem of barrier film.
The object of the present invention is to provide a kind of novel inorganic film, described inoranic membrane comprises: ultra-high molecular weight polyethylene layer, low molecular weight polyethylene layer, alumina layer; Described low molecular weight polyethylene layer is arranged on above the described ultra-high molecular weight polyethylene layer, and described alumina layer is arranged on above the described low molecular weight polyethylene layer; Or described ultra-high molecular weight polyethylene layer is arranged on above the described low molecular weight polyethylene layer, and described alumina layer is arranged on above the described ultra-high molecular weight polyethylene layer.
Another object of the present invention is to provide a kind of novel inorganic membrane preparation method, described preparation method comprises:
Be coated with first two-layer porous polyethylene net;
Ultra-high molecular weight polyethylene miscella and low molecular weight polyethylene miscella is continuously extruded, form continuous clathrum form;
With precipitation of alumina on perforated grill.
Further, the thickness of described inoranic membrane is the 16-25 micron.
Novel inorganic film of the present invention, this inoranic membrane comprises: ultra-high molecular weight polyethylene layer, low molecular weight polyethylene layer, alumina layer; The low molecular weight polyethylene layer is arranged on above the ultra-high molecular weight polyethylene layer, alumina layer is arranged on above the low molecular weight polyethylene layer, or the ultra-high molecular weight polyethylene layer is arranged on above the described low molecular weight polyethylene layer, and alumina layer is arranged on above the described ultra-high molecular weight polyethylene layer.Novel inorganic film of the present invention has the intensity that battery assembling needs, as enough large porositys of battery diaphragm; Not high to equipment requirement, with low cost, excellent performance; The porous, inorganic diaphragm of preparation is used as the lithium ion battery separator material, so that showing, battery heat endurance and thermal safety improve, the anodic aluminium oxide membrane electrical conductivity that infiltrates simultaneously electrolyte gets membrane for polymer far above commercialization, thereby so that battery has better cycle performance, high rate performance and high temperature performance.
Description of drawings
Fig. 1 is the structural representation of novel inorganic film provided by the invention and preparation method thereof.
Among the figure: 1, ultra-high molecular weight polyethylene layer; 2, low molecular weight polyethylene layer; 3, alumina layer.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the invention provides a kind of novel inorganic film, and this inoranic membrane comprises: ultra-high molecular weight polyethylene layer, low molecular weight polyethylene layer, alumina layer; The low molecular weight polyethylene layer is arranged on above the ultra-high molecular weight polyethylene layer, alumina layer is arranged on above the low molecular weight polyethylene layer, or the ultra-high molecular weight polyethylene layer is arranged on above the described low molecular weight polyethylene layer, and alumina layer is arranged on above the described ultra-high molecular weight polyethylene layer.
Referring to accompanying drawing 1, the technological process that the present invention is prepared novel inorganic film and preparation method thereof is described in further detail.
As shown in Figure 1, a kind of inoranic membrane of the present invention, be comprised of three parts: ground floor is the high porosity layer, become by ultrahigh molecular weight polyethylene, porosity is approximately 70%, the second layer be distributed in ground floor above, be to be that 100,000 to 800,000 polyethylene is made by molecular weight, and the 3rd layer be arranged in above the second layer, comprises aluminium oxide or aluminium stone.The one or two layer is the film of two-layer different molecular weight, forms perforated grill.The 3rd layer is to be formed by the porous aluminium oxide that the pH value that is dispersed in water is about 1-3, wherein regulate pH value with organic or inorganic acid, alumina content is about 15% of weight, has increased by 8.5% solid polyethylene alcoholic solution, and the ratio of aluminium oxide and alcoholic solution is about 3: 1.
A kind of Preparation of inorganic membrane method of the present invention is coated with first 2 layers of porous polyethylene net: one deck is high porosity ultra-high molecular weight polyethylene layer 1, is about 1 to 30,000 ten thousand ultrahigh molecular weight polyethylene one-tenth by molecular weight, generally is 200 ten thousand, and porosity is approximately 70%; Another layer low molecular weight polyethylene layer 2 be formed on another layer above, be that 100,000 to 800,000 polyethylene is made by molecular weight.At first, the ultra-high molecular weight polyethylene miscella is also continuously extruded with oily PE film, the second layer extruding that PE and oil form is coated onto on the ground floor, these two are subject to biaxial tension and become a continuous clathrum form, and the MD direction is extended and is about 1.5 times to 3 times, and horizontal direction extends and is about 1.5 to 4 times, film thickness after the stretching approximately is 16 to 25 microns, then after oil was removed from grid, the clathrum of porous had just formed, and the baking temperature of coated mesh is controlled at about 115 ℃.Alumina layer 3 is deposited on the perforated grill, the aluminium oxide that is about 1-3 by the pH value that is dispersed in water forms, and wherein regulates pH value with organic or inorganic acid, and alumina content is about 15% of weight, and having increased by 8.5% solid polyethylene alcoholic solution, the ratio of aluminium oxide and alcoholic solution is about 3: 1.
Novel inorganic film of the present invention, this inoranic membrane comprises: ultra-high molecular weight polyethylene layer, low molecular weight polyethylene layer, alumina layer; The low molecular weight polyethylene layer is arranged on above the ultra-high molecular weight polyethylene layer, and alumina layer is arranged on above the low molecular weight polyethylene layer; Or the ultra-high molecular weight polyethylene layer is arranged on above the low molecular weight polyethylene layer, and alumina layer is arranged on above the ultra-high molecular weight polyethylene layer.Novel inorganic film of the present invention has the intensity that battery assembling needs, as enough large porositys of battery diaphragm; Not high to equipment requirement, with low cost, excellent performance; The porous, inorganic diaphragm of preparation is used as the lithium ion battery separator material, so that showing, battery heat endurance and thermal safety improve, the anodic aluminium oxide membrane electrical conductivity that infiltrates simultaneously electrolyte gets membrane for polymer far above commercialization, thereby so that battery has better cycle performance, high rate performance and high temperature performance.
The above is only for preferred embodiment, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a novel inorganic film is characterized in that, described inoranic membrane comprises: ultra-high molecular weight polyethylene layer, low molecular weight polyethylene layer, alumina layer;
Described low molecular weight polyethylene layer is arranged on above the described ultra-high molecular weight polyethylene layer, and described alumina layer is arranged on above the described low molecular weight polyethylene layer.Or described ultra-high molecular weight polyethylene layer is arranged on above the described low molecular weight polyethylene layer, and described alumina layer is arranged on above the described ultra-high molecular weight polyethylene layer.
2. a novel inorganic membrane preparation method is characterized in that, described preparation method comprises:
Be coated with first two-layer porous polyethylene net;
With ultra-high molecular weight polyethylene miscella and continuously extruded with the low molecular weight polyethylene miscella, form continuous clathrum form;
With precipitation of alumina on perforated grill.
3. Preparation of inorganic membrane method as claimed in claim 2 is characterized in that, the thickness of described inoranic membrane is the 2-40 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012105673333A CN103072355A (en) | 2012-12-25 | 2012-12-25 | Novel inorganic membrane and preparation method thereof |
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| CN2012105673333A CN103072355A (en) | 2012-12-25 | 2012-12-25 | Novel inorganic membrane and preparation method thereof |
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| CN103072355A true CN103072355A (en) | 2013-05-01 |
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| CN2012105673333A Pending CN103072355A (en) | 2012-12-25 | 2012-12-25 | Novel inorganic membrane and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104857859A (en) * | 2015-04-07 | 2015-08-26 | 南京工业大学 | Hydrophobic inorganic porous membrane and preparation method thereof |
| DE102019112089A1 (en) * | 2019-05-09 | 2020-11-12 | Brückner Maschinenbau GmbH & Co. KG | Film with at least two layers and method for their manufacture |
| 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 |
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| CN102656719A (en) * | 2009-11-27 | 2012-09-05 | 株式会社Lg化学 | Method for manufacturing a separator, separator made by same, and electrochemical device comprising the separator |
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- 2012-12-25 CN CN2012105673333A patent/CN103072355A/en active Pending
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| KR20090005268A (en) * | 2000-04-10 | 2009-01-13 | 셀가드 인코포레이티드 | Separator for a high energy rechargeable lithium battery |
| CN101536221A (en) * | 2006-11-17 | 2009-09-16 | 赛尔格有限责任公司 | Co-extruded, multi-layered battery separator |
| CN101600571A (en) * | 2007-01-30 | 2009-12-09 | 旭化成电子材料株式会社 | Multilayer porous film and manufacture method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104857859A (en) * | 2015-04-07 | 2015-08-26 | 南京工业大学 | Hydrophobic inorganic porous membrane and preparation method thereof |
| DE102019112089A1 (en) * | 2019-05-09 | 2020-11-12 | Brückner Maschinenbau GmbH & Co. KG | Film with at least two layers and method for their manufacture |
| 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 |
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Application publication date: 20130501 |