Polymethyl methacrylate-based lithium-ion battery composite membrane
A polymethyl methacrylate, lithium-ion battery technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of easy occurrence of finger holes, the use of a large amount of solvent, and the easy appearance of closed pore structures. Effects of good breathability, improved safety and cycling performance
Inactive Publication Date: 2016-07-20
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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Problems solved by technology
The biggest disadvantage of the immersion precipitation method is that it is difficult to obtain a membrane with a symmetrical structure, and finger-shaped holes are prone to appear, which is not conducive to the contact between the separator and the electrode.
In recent years, the thermally induced phase separation method has been studied more. Its advantages are narrow pore size distribution, symmetrical structure, and no finger-like pores. The preparation process needs to use a large amount of solvent, which is easy to cause environmental pollution and other problems
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0024] 1. Preparation of polymethyl methacrylate microporous membrane
[0025] 1) Put the polymethyl methacrylate in a drying oven and dry it at constant temperature for 10-15 hours to remove the moisture therein, and seal it for later use after drying;
[0026] 2) Accurately weigh the polymethyl methacrylate particles with an electronic balance, and add an organic solvent for dissolving the polymethyl methacrylate to prepare a casting solution with a mass concentration of 15%;
[0027] 3) After the polymethyl methacrylate is completely dissolved and stirred evenly, seal and block the light and let stand for a period of time to remove the residual gas in the solution; scrape the film thickness of the polymethyl methacrylate solution to be 70 μm;
[0028] 4) Set the temperature of the water bath at 50-80°C, keep it constant, turn on the compressor and set the pressure, then turn on the high-pressure gas cylinder for a few seconds to blow away the air in the pipeline, and then c...
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Abstract
The invention relates to a polymethyl methacrylate-based lithium-ion battery composite membrane, which is mainly applied to a lithium-ion battery. A polymethyl methacrylate microporous membrane is prepared by a supercritical fluid phase separation method; and Al2O3 particles and PS microspheres are respectively compounded at two sides of the polymethyl methacrylate microporous membrane to prepare a polymethyl methacrylate lithium-ion battery composite membrane. The prepared lithium-ion battery composite membrane has good air permeability, electrolyte retention property and high temperature resistance; and the safety and the cycle performance of the battery can be significantly improved.
Description
technical field [0001] The invention relates to a lithium ion battery composite separator based on polymethyl methacrylate, which is mainly used in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been developed rapidly due to their excellent electrical properties such as high energy density, long cycle life and high voltage. Has been widely used in mobile phones, portable computers, cameras, video cameras and other electronic products. Lithium-ion batteries are divided into liquid lithium-ion batteries and solid-state lithium-ion batteries. Solid-state lithium-ion batteries are generally called polymer lithium-ion batteries or plastic lithium-ion batteries. The electrolyte of the ion battery is not a free electrolyte, but a gel electrolyte or a solid electrolyte. Polymer electrolytes not only have high ionic conductivity, long cycle life, minimal pollution and good processing performance, but also have better safety and flexibility in shape ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411
CPCY02E60/10
Inventor 卢倩
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH