High-porosity composite separator and its preparation method, high-power battery
A technology of composite diaphragm and high porosity, which is applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of a large amount of organic toxic solvents, high production costs and environmental requirements, and low porosity of composite diaphragms, and achieves Enhanced passing ability, increased space for storing electrolyte volume, and good electrochemical performance
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[0043] The present invention also relates to a method for preparing a high-porosity composite diaphragm for preparing the above-mentioned high-porosity composite diaphragm, which comprises the steps of:
[0044] A), dissolving the dispersant in deionized water to form an aqueous solution;
[0045] B) Dispersing nano-inorganic substances in an aqueous solution to form a suspension;
[0046] C), adding a binder and a pore-forming agent to the suspension to form a coating slurry;
[0047]In order to ensure the effect, in the coating slurry formed at this time, deionized water accounts for 45-50 wt% (mass percentage), pore-forming agent accounts for 12-18 wt% (mass percentage), and nano-inorganic substances account for 36-38 wt% ( mass percent), the binder accounts for 1.6-3.6wt% (mass percent), and the dispersant accounts for 0.2-0.8wt% (mass percent);
[0048] D), the slurry is evenly coated on both sides of the film substrate to form a product;
[0049] E) Place the product ...
specific Embodiment 1
[0055] A method for preparing a high-porosity composite diaphragm uses a polyethylene microporous membrane as a base material with a thickness of 9 μm and a porosity of 40%. 0.3g dispersant sodium carboxymethyl cellulose (molecular weight is about 60×10 4 ) was dispersed in 105g of deionized water and stirred, the control speed was 1500r / min, and stirred for 0.5h. Then 100gAl 2 o 3 (average particle size 380nm) was added into the solution step by step and stirred at high speed, the control speed was 2500r / min, and stirred for 2h. Then ultrasonically disperse, control the ultrasonic power to 100kw, and control the ultrasonic time to 10-30min. Then add 5g of the binder butadiene-styrene copolymer emulsion into the suspension, control the stirring speed at 1500r / min, stir for 1h, finally add 45g of pore-forming agent isopropanol, and stir at a low speed for 0.5h, and control the speed at 1000r / min. That is, the slurry is obtained. Then spray the slurry evenly on the upper ...
specific Embodiment 2
[0056] A method for preparing a high-porosity composite diaphragm uses a polyethylene microporous membrane as a base material with a thickness of 9 μm and a porosity of 40%. 0.3g dispersant hydroxyacrylate homopolymer (molecular weight is about 30×10 4 ) was dispersed in 105g of deionized water and stirred, the control speed was 1500r / min, and stirred for 0.5h. Then 100g of Al 2 o 3 (average particle size 380nm) was added into the solution step by step and stirred at high speed, the control speed was 2500r / min, and stirred for 2h. Then ultrasonically disperse, control the ultrasonic power to 100kw, and control the ultrasonic time to 10-30min. Then add 5g of the binder butadiene-styrene copolymer emulsion into the suspension, control the stirring speed at 1500r / min, stir for 1h, finally add 45g of pore-forming agent isopropanol, and stir at a low speed for 0.5h, and control the speed at 1000r / min. That is, the slurry is obtained. Then spray the slurry evenly on the upper...
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