Novel low-cost production process of lithium ion battery PE (polyethylene) diaphragm

Abstract

The invention discloses a novel low-cost production process of a lithium ion battery PE (polyethylene) diaphragm, and belongs to the field of the battery diaphragm. The production process comprises the following steps of firstly uniformly mixing polyethylene and an organic solvent to obtain a mixture; extruding the mixture, measuring and casting to obtain an oil-containing film; sending the oil-containing film after being stretched in two directions into a vacuum drying box, setting the temperature and the negative pressure so as to enable the organic solvent in the oil-containing film to be volatized to obtain a dry porous film primary product, feeding the volatized organic solvent into a waste gas adsorption device after being cooled, adsorbing the organic solvent by utilizing an adsorbent, analyzing after the adsorption, feeding analyzed waste gas into a layering trough after being condensed, and recycling the separated organic solvent by a mixing system. By adopting the production process, the separation operation of the solvent extraction and mixed liquid extraction in a conventional wet method can be avoided; moreover, the solvent recycled by the waste gas system also can continuously enter the mixing system to be recycled, so that the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of battery diaphragms, and in particular relates to a production process of a novel low-cost lithium-ion battery PE diaphragm. Background technique [0002] In recent years, as a high specific energy power source, lithium-ion batteries have been widely used in fields such as portable electronic devices, electric tools, electric vehicles, and energy storage power stations. Diaphragm is one of the important raw materials for batteries. Therefore, lithium The safety of ion batteries has always been a concern. As an important part of the lithium-ion battery, the diaphragm is used to separate the positive electrode from the negative electrode material, allowing ions to pass through and preventing electrons from passing through. The performance of the lithium battery diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity of the battery. , cycle and safety pe...

AI Technical Summary

Problems solved by technology

[0003] At present, the production methods of lithium-ion battery diaphragm mainly include dry method and wet method. The invention patent CN201010107854.1 applied by Cangzhou Mingzhu Plastic Co., Ltd. discloses a method for preparing lithium-ion battery diaphragm by wet method. The product obtained by this method is The one-time pass rate is not high. In addition, the traditional wet process also includes solvent extraction and separation of the extraction mixture, which obviously increases the input of production costs.