Modified silicon dioxide and high-property lithium ion battery diaphragm and application thereof
A lithium-ion battery, silicon dioxide technology, applied in silicon dioxide, silicon oxide, battery pack components and other directions, can solve the problems of complex process, decreased membrane mechanical strength, thick diaphragm thickness, etc., and achieves a simple and easy preparation process. The effect of industrialization and good film strength
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[0060] Example 1
[0061] A modified silica prepared by the following method:
[0062] (1) Disperse 20g of silicon dioxide with a particle size of 90nm in 600ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, fill with nitrogen and heat to boiling, then reflux at a constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene, anhydrous acetone, and vacuum dry to obtain aminated silica;
[0063] (2) Disperse 15 g of aminated silica in 300 ml of anhydrous toluene, add 80 g of triethylamine, and drop 20 g of 2-bromoisobutyryl bromide in an ice-water bath. Then the ice-water bath was removed and the reaction system was naturally heated to 20°C for 4 hours, and then washed with acetone, water, and acetone in sequence. Vacuum drying to obtain silica with ATRP initiator on the surface;
[0064] (3) Add 30g (0.30mol) methyl methacrylate, 12.5g (2mmol) of silicon dioxide with ATRP initiator on the surface prepared in step (2), 1.6346g (4mmol) 4 in a 1...
Example Embodiment
[0069] Example 2
[0070] A modified silica prepared by the following method:
[0071] (1) Disperse 25g of silica with a particle size of 300nm in 600ml of anhydrous toluene, add 100g of aminopropyltriethoxysilane, fill with nitrogen and heat to boiling, then reflux at a constant temperature (105°C) for 48h, and then sequentially Wash with anhydrous toluene and anhydrous acetone, and dry in vacuum to obtain aminated silica;
[0072] (2) Disperse 20 g of aminated silica in 300 ml of anhydrous toluene, add 80 g of pyridine, and drop 20 g of 2-bromoisobutyryl bromide under ice-water bath conditions. Then the ice-water bath was removed and the reaction system was naturally heated to 30°C for 4 hours, and then washed with acetone, water, and acetone in sequence. Vacuum drying to obtain silica with ATRP initiator on the surface;
[0073] (3) Add 42.7g (0.30mol) butyl methacrylate, 10g (1.60mmol) of silicon dioxide with ATRP initiator on the surface prepared in step (2), 1.3077g (3.20mmol)...
Example Embodiment
[0078] Example 3
[0079] A polyolefin microporous diaphragm for lithium ion batteries is prepared by the following method:
[0080] (1) Mix 100g of the modified silica prepared in Example 1 with 125g of ultra-high molecular weight polyethylene (the intrinsic viscosity measured in decalin at 135°C is 22dL / g), and then add 1250g of ordinary polyethylene resin for total Mixed granulation to obtain modified masterbatch;
[0081] (2) Melt blending and extruding 5000g modified masterbatch and 45000g polyethylene resin through a twin-screw (or single-screw) extruder, with a melt temperature of 200℃, a melt stretching ratio of 400 times, and crystallize under a stress field , Forming a diaphragm with a hard and elastic structure;
[0082] (3) Continuously stretch the membrane with a uniaxial stretching machine at a stretching ratio of 2 times and a stretching temperature of 100°C. After stretching, heat-set at 125°C for 10 minutes to prepare polyolefin for lithium ion batteries. Microporou...
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