A dry double-pulling lithium battery diaphragm production process

Abstract

A dry-process double-pulling lithium battery diaphragm production process, characterized in that the process steps are as follows: 1) Weigh 100 parts of PP / PE, 10 parts of modified poly-paratrifluorochloroethylene, modified poly-para-polyethylene 10 parts of ethylene glycol phthalate, 0.5 part of cyclohexane, 2 parts of toluene, 5 parts of nano silicon carbide, 0.5 part of carbon fiber, 2 parts of polyethylene wax; 2) mixing the raw materials in step 1), heating, Send it to the extruder for melting and extrusion, and then cool and cast it into a thick sheet on the casting roll; 3) Preheat and stretch the thick sheet in step 2) using MDO technology, cool and temper after completion, and make a film Stretching the film along the machine direction can improve the performance of the film, such as stiffness, flatness, tensile strength and porosity etc.; 4) the film in step 3) is preheated and stretched using TDO technology, and returned to the film after completion Fire setting; 5) the film after setting in step 4) is rewound, big cut, small cut, then pack and form lithium battery diaphragm.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a dry-process double-pulled lithium battery diaphragm production process. Background technique [0002] Lithium battery separator is a supporting material for batteries encouraged by the state. Since the beginning of the 21st century, energy has increasingly become a bottleneck restricting my country's economic and social development. In order to achieve rapid economic growth and sustainable social development in China, there is an urgent need to develop new energy and energy materials. The battery industry is an important part of the new energy field, which is related to the realization of the sustainable development strategy. The new material of battery diaphragm is the main force in developing energy technology, improving energy production and utilization efficiency, and has become a new hot spot in global economic development. [0003] At present, only a few count...

AI Technical Summary

Problems solved by technology

The capacity utilization rate of the domestic diaphragm industry is low, and its applications are mainly concentrated in low-end fields. High-end applications such as power lithium batteries mainly rely on imports. The price of dry-process diaphragms has dropped by about 70% compared with three years ago, and the gross profit rate has dropped to about 25%. French diaphragm technology is not yet mature

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