Ceramic membrane with improved adhesion to plasma-treated polymeric support material and the manufacture and usage thereof

A plasma and polymer technology, applied in the field of flexible ceramic membranes, can solve the problems of coating cracks, abrasion, and limiting the sustainable use of high-energy batteries, etc., to achieve improved adhesion strength, improved safety, and high stability sexual effect

Active Publication Date: 2008-11-12
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although membranes are obtained with an especially water-stable ceramic coating, the coating occasionally cracks or wears out, e.g. as a result of further processing, which limits the sustainable use of high-energy batteries

Method used

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Examples

Experimental program
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preparation example Construction

[0040] The films of the present invention and their production methods are described below, but the present invention is not limited to these embodiments.

[0041] The membrane according to the invention is based on a polymeric nonwoven having on and in the nonwoven at least one ceramic coating containing at least one compound selected from the group consisting of Al 2 o 3 、TiO 2 , ZrO 2 , BaTiO 3 and / or SiO 2 oxides, characterized in that in such a coating there are at least two selected from Al 2 o 3 , ZrO 2 、TiO 2 , BaTiO 3 and / or SiO 2 fractions of oxides, wherein a first ceramic fraction is obtained from a sol, a second fraction contains particles having an average particle size of 200 nm to 5 μm, and the first fraction is present as a layer on top of the particles of the second fraction, And the first fraction accounts for 0.1 to 50 parts by mass of the coating, the second fraction exists in the ceramic coating as 5 to 99 parts by mass of the coating, and there...

Embodiment 1

[0116] Example 1: Preparation of ceramic membrane according to the invention

[0117] To 130g of water and 15g of ethanol, first add 30g of 5% by weight of HNO 3 Aqueous solution, 10 g tetraethoxysilane, 10 g Dynasylan AMEO and 10 g Dynasylan GLYMO (all silanes: Degussa AG). In this sol, after stirring for several hours, 125 g of Martoxid MZS-1 alumina and Martoxid MZS-3 alumina (both oxides from Martinswerk) were suspended respectively. The ceramic slurry is homogenized with a magnetic stirrer for at least 24 h, during which time the stirring vessel must be covered so that no loss of solvent is possible.

[0118] For coating, use a thickness of about 100 μm and an areal density of about 30 g / m 2 55 cm wide polyamide nonwoven (PA-Vlies, from Freudenberg KG). Before coating, the polyamide nonwoven was drawn continuously through a plasma nozzle at a distance of 50 mm from the polyamide nonwoven. The plasma treatment was carried out using a system consisting of a plasma nozzl...

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PUM

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Abstract

The invention relates to a flexible ceramic membrane which is suitable for batters as a spacer according to different embodiment manners, in particular for lithium battery. The invention further relates to the preparation method thereof, wherein plasma processing is carried out to the polymer nonwovens.

Description

technical field [0001] The present invention relates to flexible ceramic membranes with improved adhesion of ceramics to polymeric nonwovens, their preparation and their use as separators or as filter membranes in liquid filtration applications. The ceramic membrane based on a ceramic-coated polymer fabric does not separate the ceramic coating even under strong mechanical stress. Background technique [0002] Electrical separators are membranes used in batteries and other devices where electrodes must be separated from each other, for example, while maintaining ionic conductivity. [0003] Separators are generally thin porous electrically insulating materials with high ion permeability, good mechanical strength, and long-term stability to chemicals and solvents used in the system (eg, in the electrolyte of a battery). In a battery, the separator should completely electrically insulate the cathode from the anode, but be permeable to the electrolyte. Furthermore, the separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/00B01D71/00H01M2/16H01M50/451H01M50/454H01M50/489H01M50/491
CPCB01D71/027B01D71/025H01M2/1686B01D67/0048H01M10/0565H01M10/052B01D2323/345H01M10/0562B01D71/024Y02E60/122H01M2/1666B01D67/0079B01D67/0046B01D69/105B01D69/10Y02E60/10H01M50/454H01M50/451H01M50/491H01M50/489B01D53/22B01D71/02
Inventor M·帕斯卡利R·-W·特沃恩C·海英G·霍佩尔
Owner EVONIK DEGUSSA GMBH
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