Ultrasonic coating systems are suitable for polyimide or similar chemical coatings to form an encapsulation layer in applications requiring a chemically inert protective coating. In lithium-ion batteries, polyimide (PI) coatings play a variety of key roles due to their excellent high temperature resistance, chemical stability, mechanical strength, and insulation properties.
Traditional battery separators (such as polyethylene and polypropylene) are prone to melting and rupture at high temperatures, leading to short circuits between the positive and negative electrodes. Polyimide coatings can withstand temperatures exceeding 200°C. Even if the substrate melts, the coating maintains the structural integrity of the separator, preventing short circuits and significantly improving the battery's thermal runaway safety. The polar surface of polyimide improves the wettability of the separator and the electrolyte, promoting lithium ion migration while minimizing side reactions between the electrolyte and the electrode materials, thereby extending the battery's cycle life.
Advantages of other types of battery layer coatings that can be applied using ultrasonic spraying:
● Separator films prevent overheating, improve safety, and extend battery life
● Functional metal oxide coatings applied to anode or cathode layers to enhance performance and efficiency
● Various layers can enhance or create desired porosity
Benefits of using ultrasonic spraying for battery layer coatings:
● Durable, mechanically stable layers
● Ultrasonic nozzles are less prone to clogging
● Achievable ideal dielectric properties
● Extensive experience in coating microporous membranes
● Highly uniform films with high reproducibility
