Ion-conducting membrane with graphene-like structure and its preparation and application
An ion-conducting membrane and graphene technology, which is applied in the ion-conducting membrane with a graphene-like structure and its preparation and application fields, can solve the problems of poor ion selectivity, limited large-scale application, and high price, and achieves adjustable sheet thickness , to achieve the controllability of battery efficiency and capacity, and to broaden the effect of types
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Embodiment 1
[0041] Accurately weigh 3g SPEEK resin and 3g PES resin, then weigh 2.0g PEG and put it into a 40×70 weighing bottle, use DMAc as solvent to prepare a casting solution with a solid content of 30wt%, stir at room temperature for 24 hours, and then let it stand to remove Soak for 24 hours. The above-mentioned casting solution was uniformly coated on a clean glass plate, and heated under a hot stage at 50°C for 24 hours to remove the solvent to obtain a PES / SPEEK / PEG film. The prepared membrane was placed in deionized water to remove PEG in the membrane to obtain a PES-SPEEK membrane (abbreviated as PG-2.0) with a membrane thickness of 102 μm. The cross-sectional morphology of the prepared PES-SPEEK membrane was characterized ( Figure 5 ), it can be seen that the cross-section of the prepared PG-2.0 film has an obvious sheet structure similar to the graphene structure, and the sheet thickness is 10-100nm.
Embodiment 2
[0043] Accurately weigh 3g of SPEEK resin and 3g of PES resin, then weigh 2.3g of PEG and put it into a 40×70 weighing bottle, use DMAc as solvent to prepare a casting solution with a solid content of 30wt%, stir at room temperature for 24 hours, and then let it stand to remove Soak for 24 hours. The above-mentioned casting solution was uniformly coated on a clean glass plate, and heated under a hot stage at 50°C for 24 hours to remove the solvent to obtain a PES / SPEEK / PEG film. The prepared membrane was placed in deionized water to remove PEG in the membrane to obtain a PES-SPEEK membrane (abbreviated as PG-2.3) with a membrane thickness of 95 μm. The cross-sectional morphology of the prepared PES-SPEEK membrane was characterized ( Figure 6 ), it can be seen that the cross-section of the prepared PG-2.3 film presents an obvious graphene-like lamellar structure, and the lamellar thickness is 5-90 nm.
Embodiment 3
[0045] Accurately weigh 3g of SPEEK resin and 3g of PES resin, then weigh 2.5g of PEG and put it into a 40×70 weighing bottle, use DMAc as solvent to prepare a casting solution with a solid content of 30wt%, stir at room temperature for 24 hours, then let it stand to remove Soak for 24 hours. The above-mentioned casting solution was uniformly coated on a clean glass plate, and heated under a hot stage at 50°C for 24 hours to remove the solvent to obtain a PES / SPEEK / PEG film. The prepared membrane was placed in deionized water to remove PEG in the membrane to obtain a PES-SPEEK membrane (abbreviated as P-2.5) with a membrane thickness of 89 μm. The cross-sectional morphology of the prepared PES-SPEEK membrane was characterized ( Figure 5 ), it can be seen that the cross-section of the prepared PG-2.5 film presents an obvious sheet structure similar to the graphene structure, and the sheet thickness is 8-70nm.
[0046] Surface resistance ( Figure 8 a) in and vanadium infilt...
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