Composite separator for lithium secondary battery and method for manufacturing same
A lithium secondary battery and composite diaphragm technology, which is applied in the field of composite diaphragm and its manufacturing, can solve the problems of battery capacity and output power drop, unsuitable for battery miniaturization, weak mechanical strength, etc., to achieve improved wettability, low thermal shrinkage, The effect of increasing the surface area
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preparation example 1
[0066] Preparation example 1. Preparation of organic-inorganic composite sol
[0067] Alumina sol was prepared by adding 30 g of boehmite powder to 260 ml of distilled water, stirring, then adding 3.3 g of acetic acid, stirring at room temperature for 1 hour, then heating to about 70° C., and keeping at this temperature for 2 hour, then cooled to room temperature, and then added distilled water to bring the total weight to 300 g, thereby preparing a 10% by weight alumina sol.
[0068]Add 39 g of 5% by weight acetic acid solution to 130 g of 3-glycidoxypropyltrimethoxysilane (GPS), stir at room temperature for 1 hour, then add 377.2 g of the above-mentioned alumina sol and heated for 4 hours. When the reaction was complete, 2.71 g of a 5% by weight acetic acid solution was added, followed by 21.79 g of methyltriethoxysilane dropwise while heating for 4 hours. After cooling the heated mixture to room temperature, 2.74 g of Y(NO 3 ) 3 ·6H 2 O and stirred to prepare an organi...
preparation example 2
[0069] Preparation example 2. Preparation of organic polymer binder PM (PVA / MA)
[0070] Transparent solutions were prepared by dispersing polyvinyl alcohol (PVA) (saponification >88%, average molecular weight <200000) powder in distilled water to a concentration of 5-10 wt%, followed by heating at about 90°C. Maleic acid (MA) was added to the PVA solution at a weight ratio (PVA:MA) of 8:2, followed by heating to prepare a clear solution and called PM. Tetraethoxysilane (TEOS) diluted with ethanol is added to this PM solution in an amount of 5 to 10% by weight relative to the amount of PVA, calculated as silica, to obtain a stable silica-containing modification PM solution, and named PMs. A stable PMa solution was also prepared by using 10 wt% boehmite powder with an average particle size of 4.5 nm instead of TEOS as described in the PMs procedure.
Embodiment 1
[0072] The coating slurry of the composite diaphragm is prepared by adding the organic-inorganic composite sol prepared in Preparation Example 1 to the boehmite slurry, which is prepared by adding boehmite (dispersion 10F4, Sasol, average The particle size is 40nm) powder is dispersed in distilled water and stirred at room temperature for 60 minutes. Add PVA and stir according to the components shown in Table 1. After immersing a porous PE substrate with a thickness of 9 μm into the coating slurry, pulled up by two glass rods, dried at room temperature for 30 min or more, and then dried in an oven at 90 °C for 30 min to obtain Composite separator with a heat-resistant coating formed on the surface of a polymer substrate.
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