Polybenzimidazole microporous membrane and preparation method and application therefor
A polybenzimidazole and benzimidazole technology, which is applied in the field of polybenzimidazole microporous membrane and its preparation, can solve the problems of limited conductivity, poor electrolyte affinity, battery short circuit, etc. The effect of good compatibility and high liquid absorption rate
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Embodiment 1
[0037] Embodiment 1: Preparation and characterization of polybenzimidazole
[0038] Add 10.65mmol (27.47g) of 4,4'-diphenyl ether dicarboxylic acid and 10.65mmol (22.794g) of 3,3'-diaminobenzidinediamine to 550g of formaldehyde containing 9.09wt% phosphorus pentoxide In sulfonic acid, under the condition of mechanical stirring under the protection of nitrogen, first react at 140°C for 1 hour, then pour it into water after cooling down to room temperature. First neutralize with sodium hydroxide to weak acidity, then neutralize with sodium bicarbonate to neutral, then filter, add the collected polymer to sodium bicarbonate solution and stir for 12 hours, filter, wash the sample to neutral , 100 ° C vacuum drying for 24 hours to obtain polybenzimidazole. figure 1 It is its nuclear magnetic resonance spectrogram, and solvent used is deuterated dimethyl sulfoxide; Record its number average molecular weight with gel permeation chromatography (GPC, eluent: the dimethyl sulfoxide con...
Embodiment 2
[0039] Example 2: Dissolve polybenzimidazole and PEG350 in a mass ratio of 1:5 (polybenzimidazole 0.2g, PEG3501g) in 10ml of dimethyl sulfoxide, and then cast the solution into a film to obtain a blend film, and the obtained blend film was dried in an oven. Then water was used as the eluent, the blended membrane was soaked in hot water for 48 hours, and then the membrane was taken out and dried in vacuum at 100°C for 10 hours to finally obtain a polybenzimidazole microporous membrane. The scanning electron micrograph of the microporous membrane is shown in figure 2 Shown, the tensile test result (stress-strain curve) of this microporous film is as follows image 3 shown. The tensile strength of the film is 30Mpa, the porosity is 40 ± 5%, the liquid absorption rate for the electrolyte exceeds 100%, and the conductivity in the electrolyte is 6mS / cm (electrolyte: 1MLiPF 6 / (EC:EMC=1:1)).
Embodiment 3
[0040] Example 3: Polybenzimidazole and PEG550 are dissolved in 10ml of N,N-dimethylacetamide or methanesulfonic acid according to the mass ratio of 1:5 (polybenzimidazole 0.2g, PEG5501g), and then the The solution is cast into a film to obtain a blended film, and the obtained blended film is dried in an oven. Then methanol was used as the eluent, the blended membrane was soaked in methanol for 48 hours, and then the membrane was taken out and dried in vacuum at 100°C for 10 hours to finally obtain a polybenzimidazole microporous membrane. The scanning electron micrograph of the microporous membrane is shown in Figure 4 Shown, the tensile test result stress-strain curve of this microporous film) such as Figure 5 As shown, the tensile strength of the microporous membrane is 21Mpa, the porosity is 75 ± 5%, the liquid absorption rate for the electrolyte exceeds 200%, and the conductivity in the electrolyte is 10mS / cm (electrolyte: 1MLiPF 6 / (EC:EMC=1:1)).
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