Separators are indispensable components of modern electrochemical energy storage devices such as lithium-ion batteries (LIBs). They perform the critical function of physically separating the electrodes to prevent short-circuits while permitting the ions to pass through.
Separator, as the one with highest technical barrier among four major raw materials of lithium battery, is the only remainder that still has not been completely made in China yet, particularly the wet-process separator which has been much sought after over the recent years.
Polyimide-based separators are promising for next-generation rechargeable batteries with enhanced safety and energy density. The molecular design strategies and microstructural control methods for high-performance polyimide-based separators for lithium-ion batteries are reviewed in detail. 1. Introduction
Some unmet needs for lithium-ion battery separators are addressed, largely based on vital criteria for next-generation batteries. New separator materials with new requirements will be necessary for use in emerging applications. Furthermore, the development of new materials for lithium-ion batteries has led to the need for new separator materials.
The properties and characteristics of a lithium-ion battery separator are vital for performance and safety. Here, our expert Tahsin Ali Kassam analyses recent patent activity and examines Morgan Advanced Materials’ important new patent, which relates to ionic conducting compositions for energy storage devices.
It is crucial to obtain an in-depth understanding of the design, preparation/ modification, and characterization of the separator because structural modifications of the separator can effectively modulate the ion diffusion and dendrite growth, thereby optimizing the electrochemical performance and high safety of the battery.