A method for preparing PVDF lithium-ion battery separators by electrospinning

Abstract

The invention discloses a method for preparing a PVDF lithium-ion battery diaphragm by electrospinning. 1) configuring a polyvinylidene fluoride glacial acetic acid solution with a concentration of 17-20wt%; 2) stirring the polyvinylidene fluoride glacial acetic acid solution evenly; 3) Cool completely at room temperature of 25°C to obtain the spinning solution; 4) Take an appropriate amount of spinning solution with a syringe, install the syringe on the syringe pump, connect the needle, and clamp the positive electrode of the high-voltage electrostatic generator on the needle, The negative electrode is connected to the receiving screen, and the tinfoil paper is laid on the roller; 5) Set the spinning rate, adjust the spinning voltage and spinning distance, and perform electrospinning; after spinning, remove the tinfoil paper from the roller, and you can Lithium-ion battery separator. The invention has the advantages of simple process, low energy consumption, low production cost, high product performance, flexible control of pore size and film thickness, is beneficial to the improvement of the ion permeability of the diaphragm and the cycle performance of the battery, and has a good market prospect.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for preparing a PVDF (polyvinylidene fluoride) lithium ion battery diaphragm by electrospinning, and belongs to the technical field of nanofiber membrane preparation. Background technique [0002] The diaphragm is an important part of the lithium-ion battery. Its function is to prevent the contact between the positive and negative active materials to cause a short circuit and to maintain the necessary electrolyte to form a channel for ion movement during the electrochemical reaction. The performance of the separator affects the electrochemical performance of the battery, and plays a vital role in the safety performance of the battery. [0003] Lithium-ion battery separators currently on the market mainly use thin-filmed polyolefin materials, such as polyethylene (PE) microporous membranes, polypropylene (PP) microporous membranes, and polypropylene / polyethylene (PP / PE) / PP) comp...

AI Technical Summary

Problems solved by technology

However, the range of materials applicable to this method is limited, and fiber raw materials are mainly used for preparation, and the preparation process is relatively complicated, and the pore size is large. Other methods need to be used to modify the separator to meet the needs of lithium-ion battery separators.

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