Preparation method of secondary functionalized double-coating modified polyether sulfone lithium-sulfur battery diaphragm
A lithium-sulfur battery and sulfonated polyethersulfone technology, which is applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve problems such as low melting point, inability to effectively suppress the shuttle effect, low discharge capacity and Coulombic efficiency, etc. Problems, to achieve good adsorption, excellent rate performance, improve the effect of puncture strength and liquid absorption rate
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[0028] Example 1: In N 2 Atmosphere, under the condition of stirring at 25°C and 2000rpm, dissolve 5g of polyethersulfone PES in 110g of dichloromethane to obtain the first solution, and then slowly add 50g of chlorosulfonic acid to the first solution at 25°C to make the reaction proceed for 3h. The mixed solution was then immersed in cold water for 3 hours to produce a precipitate, the mixed solution was filtered to obtain the precipitate, and the precipitate was washed with deionized water for several times until the pH became 5, and then the precipitate was dried at 120 °C under vacuum for 48 h to obtain dry sulfonated Polyethersulfone SPES;
[0029] Take 4g of sulfonated polyethersulfone and 2g of polyacrylonitrile, dissolve them in 50g of dimethylformamide, and prepare a precursor solution with a certain concentration. The precursor solution is matured at 60 °C for 12h, stirred for 24h, and allowed to stand for 24h; then Electrospinning was carried out with the precursor...
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[0035] Example 2: In N 2 Atmosphere, under the condition of stirring at 25°C and 2000rpm, dissolve 7g of polyethersulfone PES in 150g of dichloromethane to obtain the first solution, and then slowly add 60g of concentrated sulfuric acid to the first solution at 25°C to make the reaction proceed for 4h to form a mixture Then, the mixed solution was immersed in cold water for 4 hours to produce a precipitate, the mixed solution was filtered to obtain the precipitate, and the precipitate was washed with deionized water for several times until the pH became 5. ether sulfone SPES;
[0036] Take 5g of sulfonated polyethersulfone, 1g of polyacrylonitrile and 1.5g of polyetheretherketone, dissolve them in 55g of dimethylacetamide, and prepare a precursor solution with a certain concentration. The precursor solution is aged at 65 °C for 18h and stirred. 28h, let stand for 24h; then electrospin with the precursor solution, set the spinning voltage to 15KV, the solution injection rate t...
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[0042] Example 3: In N 2 Atmosphere, under the condition of stirring at 25°C and 2000rpm, dissolve 10g of polyethersulfone PES in 200g of dichloromethane to obtain the first solution, and then slowly add 100g of chlorosulfonic acid to the first solution at 25°C to make the reaction proceed for 5h. The mixed solution was then immersed in cold water for 5 hours to produce a precipitate, the mixed solution was filtered to obtain the precipitate, and the precipitate was washed with deionized water for several times until the pH became 5, and then the precipitate was dried under vacuum at 120 ° C for 54 h to obtain dry sulfonated Polyethersulfone SPES;
[0043] Take 4g of sulfonated polyethersulfone and 1.8g of polyimide, dissolve them in 45g of dimethyl sulfoxide, and prepare a precursor solution with a certain concentration. The precursor solution is aged at 70 °C for 20h, stirred for 30h, and left to stand for 30h Then, the precursor solution was used for electrospinning, and t...
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