Battery diaphragm and preparation method thereof
A battery separator and electrolyte technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of reducing battery energy density, poor tensile mechanical properties, uneven current density distribution, etc., to improve energy density, The effect of high mechanical strength and small pore size
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[0065] Example 1
[0066] This embodiment provides the first battery separator, and the specific preparation method is as follows:
[0067] 1. Dry polyvinylidene fluoride (PVDF) at 80℃ for 10 hours in a vacuum environment, and then dissolve PVDF powder in N-methylpyrrolidone (NMP) solution to obtain a transparent, uniform and stable PVDF / NMP The battery separator spinning solution, wherein the solid content of the battery separator spinning solution is 21 wt%.
[0068] 2. The prepared PVDF / NMP battery diaphragm spinning solution is made into PVDF battery diaphragm fiber filaments by electrostatic spinning. The injection needle adopts 12# (the inner diameter of the needle is 1.2mm), the spinning voltage is 13.5KV, the advance speed of the metering pump is 0.065mm / min, the distance between the syringe needle and the take-up plate is 20cm, the spinning time is 0.5h, and the spinning temperature It is 25°C. The air humidity is 45%, the carbon paper is bent and spread on the receiving ...
Example Embodiment
[0070] Example 2
[0071] This embodiment provides a second battery separator, and the specific preparation method is as follows:
[0072] 1. Polyetherimide (PEI) is dried at 80°C for 6 hours in a vacuum environment, and then the PEI particles are dissolved in N-methylpyrrolidone (NMP) solution at 90°C to obtain a transparent, uniform and stable The PEI battery diaphragm spinning solution, wherein the solid content of the PEI battery diaphragm spinning solution is 25 wt%.
[0073] 2. The prepared transparent PEI battery diaphragm spinning solution is made into PEI battery diaphragm fiber filaments by the electrostatic spinning method. The injection needle adopts 12# (the inner diameter of the needle is 1.2mm), the spinning voltage is 14KV, the advancing speed of the metering pump is 0.05mm / min, the distance between the syringe needle and the take-up plate is 20cm, the spinning time is 0.5h, and the spinning temperature is 25°C. The air humidity is 45%, the carbon paper is bent and...
Example Embodiment
[0075] Example 3
[0076] This embodiment provides a third battery separator, and the specific preparation method is as follows:
[0077] 1. Polypropylene (PP) is dried at 80°C for 6 hours in a vacuum environment, and then PP particles are dissolved in N-methylpyrrolidone (NMP) solution at 90°C to obtain a transparent, uniform and stable PP battery The diaphragm spinning solution, wherein the solid content of the PEI battery diaphragm spinning solution is 25 wt%.
[0078] 2. The prepared transparent PP battery diaphragm spinning solution is made into PP battery diaphragm fiber yarn by electrostatic spinning method. The injection needle adopts 12# (the inner diameter of the needle is 1.2mm), the spinning voltage is 14KV, the advancing speed of the metering pump is 0.055mm / min, the distance between the syringe needle and the take-up plate is 20cm, the spinning time is 0.5h, and the spinning temperature is 25°C. The air humidity is 45%, the carbon paper is bent and spread on the rece...
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