Reinforced nanofiber porous membrane and preparation method thereof
A nanofiber and reinforced technology, which is applied in the field of lithium-ion battery diaphragm and its preparation, can solve the problems of poor mechanical properties of nanofiber porous membrane, decreased battery self-shutdown performance, and failure to reach battery strength, etc., to improve mechanical properties, Improvement of ion permeability and improvement of tensile strength
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Embodiment 1
[0038] 1. Preparation of PVDF fiber membrane
[0039] Dissolve polyvinylidene fluoride (PVDF) in a mixed solvent of N,N-dimethylformamide (DMF) and acetone with a mass ratio of 5:5, and prepare a solution with a concentration of 12wt%, at 50-60°C Heat and stir for 10-20 minutes to achieve full dissolution. Inject the solution into a syringe pump with an 8# flat needle, the needle is connected to the high-voltage output end, and the other end 15cm away from the syringe pump is a metal roller electrode that is grounded to the high-voltage power supply as a collection device. Adjust the injection speed of the syringe pump to 0.3ml / h, and slowly increase the voltage to 15kv. The above solution is sprayed from the needle of the syringe pump under the action of high pressure, and the film in the form of non-woven fabric is collected on the metal collecting device, and the obtained non-woven film is placed in a vacuum drying oven, and the operation is performed at normal temperature...
Embodiment 2
[0050] 1. Preparation of PVDF-HFP fiber membrane
[0051] Dissolve polyvinylidene fluoride-hexachloropropylene (PVDF-HFP) in a mixed solvent of N,N-dimethylformamide (DMF) and acetone mass ratio=8:2, and prepare a solution with a concentration of 16wt%. Heat and stir at 50°C for 20 minutes to fully dissolve. Inject the solution into a syringe pump with an 8# flat needle, the needle is connected to the high-voltage output end, and the other end 15cm away from the syringe pump is a metal roller electrode that is grounded to the high-voltage power supply as a collection device. Adjust the injection speed of the syringe pump to 0.47ml / h, and slowly increase the voltage to 15kv. The above solution is sprayed out from the needle of the syringe pump under the action of high pressure, and the film in the form of non-woven fabric is collected on the metal collecting device, and the obtained non-woven film is placed in a vacuum drying oven, and it is operated at normal temperature and ...
Embodiment 3
[0062] 1. Preparation of PMMA nanofiber porous membrane
[0063] Polymethyl methacrylate (PMMA) is dissolved in the mixed solvent of N, N-dimethylformamide (DMF) and toluene mass ratio=3: 2, is prepared into the solution that concentration is 20wt%, stirs at room temperature 24h to achieve full dissolution. Inject the solution into a syringe pump with an 8# flat needle, the needle is connected to the high-voltage output end, and the other end 18cm away from the syringe pump is a metal roller electrode grounded with a high-voltage power supply as a collection device. Adjust the injection speed of the syringe pump to 0.2ml / h, and slowly increase the voltage to 15kv. Under the action of high pressure, the polymer solution is sprayed out from the needle of the syringe pump, and the film in the form of non-woven fabric is collected on the metal collecting device. The obtained non-woven film is placed in a vacuum drying oven, and it is operated at room temperature and reduced press...
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