Preparation method of PVDF-CTFE-based lithium-sulfur battery composite diaphragm
A PVDF-CTFE, composite diaphragm technology, used in lithium batteries, secondary batteries, battery pack components, etc., can solve the problems of low discharge capacity and Coulomb efficiency, low melting point, inability to effectively suppress the shuttle effect, etc., and achieve a good solvent. and electrochemical stability, excellent product performance, good electrochemical reactivity effect
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Embodiment 1
[0025] Example 1: 1.7g of titanium dioxide nanoparticles with a particle size of 50nm and 0.22g of 2,5-dihydroxyterephthalaldehyde were added to a solution containing 0.18g of mesitylene and 0.15g of dimethylacetamide and ultrasonically treated for 15min to obtain Solution A: Take 3.9g of sulfonated polyamide and add it to 0.26g of mesitylene and 0.34g of dimethylacetamide for 15 minutes of ultrasonic treatment to obtain solution B. Mix solution A and solution B into a Pyrex tube and add 0.092g of acetic acid , followed by sonication for 10 min followed by snap freezing under liquid nitrogen followed by degassing through three freeze-thaw cycles. The tube was then sealed and heated at 110° C. for 72 h, and the precipitate was filtered by vacuum filtration. Finally, wash with acetone, deionized water and ethanol, respectively. After drying under vacuum at 120 °C overnight, the as-prepared TiO 2 @COF powder.
[0026] 1 g of PVDF-CTFE was dried at 80 °C for 24 h, then dissolve...
Embodiment 2
[0029] Example 2: 1.9g of silica nanoparticles with a particle size of 40nm and 0.27g of 2,5-dihydroxyterephthalaldehyde were added to a solution containing 0.24g of mesitylene and 0.135g of dimethyl sulfoxide for ultrasonic treatment 15min to obtain solution A; take 4.23g of sulfonated polyurethane and add it to 0.28g of mesitylene and 0.36g of dimethyl sulfoxide for 15min to obtain solution B, mix solution A and solution B into the Pyrex tube, and then add 0.12 g acetic acid was sonicated for 10 min followed by snap freezing under liquid nitrogen followed by degassing through three freeze-thaw cycles. The tube was then sealed and heated at 110° C. for 72 h, and the precipitate was filtered by vacuum filtration. Finally, wash with acetone, deionized water and ethanol, respectively. After drying under vacuum at 120 °C overnight, the as-prepared SiO 2 @COF powder.
[0030] 2 g of PVDF-CTFE was dried at 80 °C for 24 h, then dissolved in 7.5 g of DMSO to form solution D, which...
Embodiment 3
[0033] Example 3: 3.2g of antimony trioxide nanoparticles with a particle size of 60nm and 0.44g of 2,5-dihydroxyterephthalaldehyde were added to a solution containing 0.36g of mesitylene and 0.26g of N-methylpyrrolidone and ultrasonically Treat for 15 minutes to obtain solution A; take 6.45g of sulfonated polyurethane and add it to 0.48g of mesitylene and 0.65g of N-methylpyrrolidone and ultrasonically treat for 15 minutes to obtain solution B, mix solution A and solution B into the Pyrex tube, and then add 0.16 g of acetic acid was sonicated for 10 min followed by snap freezing under liquid nitrogen, followed by degassing through three freeze-thaw cycles. The tube was then sealed and heated at 110° C. for 72 h, and the precipitate was filtered by vacuum filtration. Finally, wash with acetone, deionized water and ethanol, respectively. After drying under vacuum at 120 °C overnight, the as-prepared Sb 2 o 3 @COF powder.
[0034] 4 g of PVDF-CTFE was dried at 80 °C for 24 h...
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