Preparation method of ceramic coating polyolefin microporous membrane, polyolefin microporous membrane and application
A polyolefin microporous membrane and ceramic coating technology, which is applied in the direction of separators/films/diaphragms/spacer elements, structural parts, electrical components, etc. Uniformity and other issues, to achieve the effect of improving puncture resistance and tensile strength, not easy to fall off, and uniform coating
Active Publication Date: 2020-01-21
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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- Application Information
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Problems solved by technology
Polyolefin microporous membrane has the advantages of high porosity, high tear strength, high acid and alkali resistance, chemical resistance, and low price; however, when the battery temperature rises, especially when the temperature is 200 ° C, polyolefin microporous The film will shrink or melt, which will lead to contact and short circuit between the positive and negative electrodes, causing unsafe accidents
Therefore, it is necessary to apply a ceramic coating to improve its temperature resistance; however, PP and PE microporous membranes are non-polar, and the coated ceramic coating is easy to fall off, or the coating is uneven, and short circuits are prone to occur during use.
Method used
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Examples
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Comparison scheme
Effect test
Embodiment
[0024] In this example, the PP base film ZD25 purchased in the market is used for testing, the details are as follows:
[0025] The PP base film ZD25 is unfolded, and placed in a sealed fluorinated treatment chamber, the temperature is room temperature, the pressure is 1 atmosphere, and the volume concentration of fluorine gas is 0.05%, and the reaction is performed for 20 seconds to obtain the fluorinated base film ZD25 of this example.
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The invention discloses a method for preparing a ceramic coating polyolefin micro-porous membrane, a polyolefin micro-porous membrane and application. The method for preparing the ceramic coating polyolefin micro-porous membrane disclosed by the invention comprises the following steps: performing fluoridation treatment on a polyolefin micro-porous base membrane, and forming a ceramic coating on the surface of the polyolefin micro-porous base membrane subjected to the fluoridation treatment, wherein the fluoridation treatment comprises the step of arranging the base membrane in fluorine gas with the concentration of 0.05% for 20-60 seconds. According to the method for preparing the ceramic coating polyolefin micro-porous membrane disclosed by the invention, the polyolefin micro-porous membrane is subjected to fluoridation treatment, and the ceramic coating is coated; due to the fluoridation treatment, the polarity and wettability on the surface of the polyolefin micro-porous membrane can be effectively improved, and the surface bonding force between the polyolefin micro-porous membrane and the ceramic coating is improved, so that the ceramic coating is uniform in coating and difficult to drop. Moreover, molecular chain wrapping of the polyolefin micro-porous membrane is initiated by the fluoridation treatment, and the puncture resistance and tensile strength are further improved.
Description
technical field [0001] The application relates to the field of polyolefin microporous membranes, in particular to a method for preparing a ceramic-coated polyolefin microporous membrane, the polyolefin microporous membrane prepared by the method and its application. Background technique [0002] At present, separators for lithium-ion batteries are generally polyolefin microporous membranes, including polypropylene (abbreviated as PP) single-layer microporous membranes, polyethylene (abbreviated as PE) single-layer microporous membranes, and multilayer microporous membranes composed of PP and PE. film etc. Polyolefin microporous membrane has the advantages of high porosity, high tear strength, high acid and alkali resistance, chemical reagent resistance, and low price; however, when the battery temperature rises, especially when the temperature is 200 ° C, polyolefin microporous The film will shrink or melt, which will lead to contact and short circuit between the positive a...
Claims
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IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/40H01M50/403H01M50/409H01M50/411H01M50/449Y02E60/10
Inventor 涂婷陈官茂张辉王会娜樊孝红
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD