Preparation method of polyetherimide mixture separator and application of separator in lithium sulfur battery
A polyetherimide, lithium-sulfur battery technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problem of not completely suppressing the "shuttle effect of polysulfides", and achieve strong practical value, The effect of improving capacity retention and easy implementation
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Embodiment 1
[0026] Dissolve 12.5g of PEI, 1.5g of polyvinylpyrrolidone and 0.15g of nano-titanium dioxide in 35.85g of NMP, then place the resulting mixed casting solution in an oil bath and heat it at 75°C for 24h while stirring, then ultrasonically 10 minutes, put it in an oven at 70°C for 12 hours, and then obtain a homogeneously cast mixed film solution; cast the obtained homogeneously mixed film cast solution on a glass plate, and then adjust the scraper parameters to obtain different film thicknesses. Diaphragm; use a scraper to obtain diaphragms of different thicknesses and immerse them in deionized water to form pores, then stand still, and replace the deionized water continuously during the period; heat and dry the diaphragm in a vacuum drying oven after standing, and the heating and drying temperature is 60 ℃, drying time is 12h. Conduct physical and electrochemical performance tests on the obtained separator: mainly including tests on porosity, puncture strength, melting temper...
Embodiment 2
[0028] Dissolve 13 g of PEI, 1 g of polyethylene glycol and 0.375 g of vanadium dioxide in 35.63 g of NMP, then place the resulting mixed casting solution in an oil bath and heat it at 65°C for 24 hours while stirring, then sonicate for 10 minutes. Put it in an oven at 70°C and let it defoam for 12 hours to obtain a homogeneously cast mixed film solution; cast the obtained homogeneously mixed film cast solution on a glass plate, and then adjust the scraper parameters to obtain diaphragms with different film thicknesses; Use a spatula to obtain diaphragms of different thicknesses and immerse them in a coagulation bath composed of dimethylacetamide and deionized water for phase separation and pore formation, let stand for 2 hours, then transfer to deionized water, and let stand for 2-3 days During this period, the deionized water was constantly replaced; the diaphragm was heated and dried in a vacuum drying oven after standing, the heating and drying temperature was 55 ° C, and t...
Embodiment 3
[0030] Dissolve 12.5g of PEI, 1.5g of sodium nitrate and 0.15g of titanium dioxide in 35.85g of NMP, then place the obtained mixed casting solution in an oil bath and heat it at 75°C for 24h, then ultrasonic for 10min, put it in 70 Put it in an oven at ℃ for defoaming for 12 hours to obtain a homogeneously cast mixed film solution; cast the obtained homogeneously mixed film cast solution on a glass plate, and then adjust the scraper parameters to obtain diaphragms with different film thicknesses; use a scraper to obtain Diaphragms of different thicknesses are immersed in a coagulation bath composed of dimethylformamide and deionized water to form pores by phase separation. They are left to stand for 2 hours, then transferred to deionized water, and left to stand for 2-3 days. Stop to replace the deionized water; heat and dry the diaphragm in a vacuum drying oven after standing, the heating and drying temperature is 60 ° C, and the drying time is 12 hours. Conduct physical and ...
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