Future Prospects of Polyimide Diaphragms
Future Prospects of Polyimide Diaphragms – Functional Coatings – Cheersonic
With the development of electronic information and new energy industries, higher requirements are placed on the safety of lithium-ion batteries, especially power batteries for new energy vehicles. Although the diaphragm does not actually participate in the energy conversion process of lithium-ion batteries, it still becomes one of the key materials that determine battery performance. From the basic principle of electrochemical energy conversion, the electronic blocking effect of the diaphragm is a necessary condition for the establishment of chemical power sources; and from the practical application level, the diaphragm is an important link to prevent battery thermal runaway and determine battery safety performance.
Therefore, the requirements for high temperature resistance of power lithium battery diaphragms have also increased accordingly. Many power lithium battery manufacturers require diaphragms to have high temperature heat shrinkage performance of 150°C. PI diaphragms are regarded as the next generation of diaphragm materials to be developed with emphasis due to their excellent thermal stability and good electrolyte absorption and retention, providing better safety protection for power batteries.
At present, although the research on PI diaphragms has achieved many interim results, most of the research results remain in the laboratory research stage. At the same time, compared with the currently used polyolefin diaphragms, its mechanical properties are poor, the processing cost is high, and there are still many problems with the equipment and processes required for mass production, so it is still a long way from industrial production. It is recommended that the corresponding scientific research institutes, equipment processing companies, diaphragm manufacturers and diaphragm application companies carry out cooperative research and tackle key problems through the “production, learning, research and application” approach, focusing on the PI diaphragm formula and modification mechanism, supporting production equipment and processes, and the application of PI diaphragms in lithium batteries. Research work can shorten the PI diaphragm development cycle and accelerate the industrialization process of PI diaphragms.
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