Lithium ion battery diaphragm based on polypropylene heavy ion track film and preparation method thereof
A heavy ion, polypropylene technology, applied in battery pack parts, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of large pore size, low affinity of polyolefin separators, and poor pore size uniformity. Achieve the effect of small pore size, low internal resistance and uniform pore size
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Embodiment 1
[0043] 1) Using the high-energy heavy ion beam current provided by the heavy ion accelerator, it is heavy ion xenon (the energy of the heavy ion is 19.5MeV / u), vertically irradiates the 12μm PP film, and the irradiation density is 5×10 9 ions / cm 2 .
[0044] 2) The PP film irradiated with heavy ions was chemically etched at a water bath temperature of 80° C., and the etching solution was a chromic acid solution with a molar concentration of 8 mol / L, and 0.1% by mass percentage of ethylphenylpolyethylene was added therein. Ethylene glycol (NP-40) surfactant, the etching time is 30min, and the PP heavy ion track membrane with vertical channels with a diameter of 80±5nm is obtained.
[0045] figure 1 with figure 2They are the front SEM image and the cross-sectional SEM image of the PP heavy ion tracking membrane of this embodiment, respectively. From the front SEM image of this embodiment, it can be seen that the surface of the PP heavy ion track membrane prepared by the met...
Embodiment 2
[0051] 1) Use the high-energy heavy ion beam current provided by the heavy ion accelerator, which is heavy ion Bi (the energy of the heavy ion is 9.8MeV / u), vertically irradiate the 25μm PP film, and the irradiation density is 1×10 9 ions / cm 2 .
[0052] 2) The PP film irradiated with heavy ions is chemically etched at a water bath temperature of 90° C., and the etching solution is a chromic acid solution with a molar concentration of 9 mol / L, and 0.2% dodecyl diacetate is added thereto. Sodium phenylene ether disulfonate (CR-MADS) surfactant, the etching time is 40min, and a PP heavy ion track membrane with vertical channels with a diameter of 100±20nm is obtained.
Embodiment 3
[0054] 1) Using the high-energy heavy ion beam current provided by the heavy ion accelerator, it is heavy ion tantalum (the energy of the heavy ion is 12.5MeV / u), vertically irradiates the 12μm PP film, and the irradiation density is 1×10 10 ions / cm 2 .
[0055] 2) The PP film irradiated with heavy ions is chemically etched at a water bath temperature of 80°C. The etching solution is a chromic acid solution with a molar concentration of 10mol / L, and a fluorocarbon surfactant with a mass percentage of 0.2% is added therein (DuPont FSA), the etching time was 60min, and the PP heavy ion track membrane with a vertical channel with a diameter of 60±5nm was obtained.
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