Modification method for lithium-sulfur battery diaphragm
A lithium-sulfur battery and diaphragm technology, which is applied in the modification of lithium-sulfur battery diaphragm and interface modification of lithium-sulfur battery diaphragm, can solve the problems such as the inability to suppress the shuttle effect, and achieve easy industrialization, suppression of shuttle, and simple preparation process Effect
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[0027] Example 1: m-phenylenediamine and equimolar 1,4-cyclohexanediamine were dissolved in deionized water to prepare an aqueous medium with a polyamine concentration of 0.25 mol / L. Dissolve trimesoyl chloride and equimolar terephthaloyl chloride in n-hexane to prepare an oil phase medium with a polybasic acid chloride concentration of 0.25 mol / L. Dissolve 10 g of lithium polyacrylate in an aqueous medium. Immerse the polyvinylidene fluoride lithium-sulfur battery diaphragm in the aqueous medium for 1 minute, take out and remove the residual aqueous medium on the surface of the porous support film, and then contact the surface of the lithium-sulfur battery diaphragm with the oil-phase medium on one side for 5 seconds. Interfacial polymerization reaction to obtain the nascent modified lithium-sulfur battery separator. The nascent modified lithium-sulfur battery separator was taken out, dried, and heat-treated at 50°C for 60 minutes, and then immersed in deionized water at 30°C...
Example Embodiment
[0028] Example 2: Dissolving p-phenylenediamine in deionized water to prepare an aqueous medium with a polyamine concentration of 0.05 mol / L. Dissolve 5-oxoformyl chloride-isophthalic acid chloride in toluene to prepare an oil phase medium with a polybasic acid chloride concentration of 0.05 mol / L. Dissolve 0.5 g of polymethyl methacrylate in the oil phase medium. The polyimide lithium-sulfur battery separator was immersed in the aqueous medium for 80 minutes, and after removing and removing the residual aqueous medium on the surface of the porous support film, the surface of the lithium-sulfur battery separator was contacted with the oil-phase medium on one side for 90 seconds. Interfacial polymerization reaction to obtain the nascent modified lithium-sulfur battery separator. The nascent modified lithium-sulfur battery separator was taken out, dried and then heat-treated at 60°C for 30 minutes, and then immersed in deionized water at 25°C for 10 minutes to obtain a modified ...
Example Embodiment
[0029] Example 3: 1,3-cyclohexanedimethylamine was dissolved in deionized water to prepare an aqueous medium with a polyamine concentration of 0.18 mol / L. Dissolve isophthaloyl chloride in benzene to prepare an oil phase medium with a polyamine concentration of 0.18 mol / L. Dissolve 5g of graphene oxide in an aqueous medium. The polyethylene lithium-sulfur battery separator is immersed in the water-phase medium for 50 minutes, and the residual water-phase medium on the surface of the porous support film is taken out and removed, and then the surface of the lithium-sulfur battery separator is contacted with the oil-phase medium on one side for 30s to carry out interfacial polymerization. Through the reaction, a nascent modified lithium-sulfur battery separator is obtained. The nascent modified lithium-sulfur battery separator was taken out, dried and then heat-treated at 80°C for 10 minutes, and then immersed in deionized water at 40°C for 5 minutes to obtain a modified lithium-...
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