TPU lithium-ion battery diaphragm materials research progress

https://elibrary.ru/JGDZNZ

Abstract

Lithium-ion battery diaphragm is one of the core components to ensure battery performance and safety, wherein polyolefin diaphragm is one of the most commonly used lithium-ion battery diaphragms, but the traditional polyolefin diaphragm is an outstanding contradiction in its application due to insufficient electrolyte wettability and other problems. Thermoplastic polyurethane (TPU) has become a research focus of membrane materials due to its good wettability of electrolyte. This paper mainly describes the performance requirements of lithium-ion battery diaphragm and the preparation process of TPU-based diaphragm material. Through comparing polyolefin diaphragm and TPU diaphragm, the results show that compared with polyolefin diaphragm, TPU diaphragm has prominent advantages in thermal stability and electrolyte affinity, and has potential in improving battery safety and energy density. In the future, the standardization and industrial application of dry and wet composite process can be further promoted through diaphragm material modification and process optimization.