Method for preparing polymer microporous membrane for lithium ion battery electrolyte
A technology of lithium-ion batteries and polymers, which is applied in the manufacture of electrolyte batteries, batteries with organic electrolytes, solid electrolytes, etc. It can solve the problems of difficult control of membrane characteristics and complicated preparation methods, and achieve simple and easy preparation methods with low cost. , the effect of high porosity
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[0024] Preparation concentration is 1%~15% casting solution (the preparation method of casting solution is known technology), the casting solution is scraped and coated as a thin layer casting solution with a thickness of 50~500 microns, and the thin layer is then used with a humidifier. The layer casting solution is humidified to induce phase transfer to obtain a microporous membrane. If the humidification is carried out in a sealed environment, the loss of moisture can be reduced and the humidification efficiency can be improved. After further washing and drying, a microporous membrane is obtained. Lithium-ion batteries can be assembled after the dried microporous membrane is soaked in liquid electrolyte.
[0025] The casting solutions provided in the embodiments of the present invention include the following polyacrylonitrile-based and polyvinylidene fluoride-based casting solutions, but are actually not limited to the casting solutions listed in the present invention.
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Embodiment 1
[0035] Embodiment 1. Get 1 gram of acrylonitrile and methyl methacrylate copolymer to be dissolved in 100 milliliters of dimethylformamide, stir solution until transparent, obtain 1% casting solution. Scrape all casting solution on glass plate with scraper to become 200 micron thick thin layer casting solution, cover this thin layer casting solution with sealing cover, add 50 grams of water in 10 minutes with humidifier. The obtained phase-transfer microporous membrane is washed and dried several times to obtain a uniform microporous membrane with a pore size of about 1 micron and a porosity of 80%, such as figure 1 As shown, it can be used as a microporous membrane for lithium ion battery gel electrolyte. Compared with the electrolyte membrane prepared by the traditional phase transfer method, the electrolyte membrane prepared by the method has the characteristics of high porosity, small pore diameter, dense and uniform membrane. The conductivity of the prepared gel electrol...
Embodiment 2
[0036] Example 2. Dissolve 8 grams of vinylidene fluoride and hexafluoropropylene copolymer in 100 milliliters of N-methylpyrrolidone, and stir the solution until it becomes transparent to obtain an 8% casting solution. With a spatula, all the casting solution is scraped into a 300 micron thick thin layer casting solution on a glass plate, and the thin layer casting solution is covered with a sealing cover, and 120 grams of water is added in 40 minutes with a humidifier. The obtained phase-transfer microporous membrane is washed and dried several times to obtain a uniform microporous membrane with a pore diameter of about 5 microns and a porosity of 85%, such as figure 2 As shown, it can be used as a microporous membrane for lithium ion battery gel electrolyte. The conductivity of the prepared gel electrolyte reaches 3.4×10 -3 S / cm.
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