The global battery separator market size was estimated at USD 4.21 billion in 2022 and is expected to grow at a compound annual growth rate (CAGR) of 15.8% from 2023 to 2030. The product demand is propelled by its wide-scale usage in the end-use industries, such as automotive, consumer electronics, and industrial.
Ideally, N M should be close to one, while the typical values of the N M for Li-ion battery separators range from 5 to 15. Besides the development of solid electrolyte interphase (SEI) on the electrode particle surface, the compatibility between the separator and the electrodes can also change the cell resistance.
The dry battery separator technology segment dominated the global market in 2022 and accounted for the largest share of above 61.0% of the overall revenue. The widespread usage of smartphones, laptops, wearables, and other portable devices relies on lithium-ion batteries with dry separators to provide efficient and safe energy storage.
In addition, the separator should be mechanically strong, with no skew or yield, to keep the anode and cathode from contacting each other during the whole battery lifetime. Separators also must possess dimensional stability at elevated temperatures, especially for applications in high-power batteries.
Separators for liquid electrolyte Li-ion batteries can be classified into porous polymeric membranes, nonwoven mats, and composite separators. Porous membranes are most commonly used due to their relatively low processing cost and good mechanical properties.
These separators enable greater electrode material loading, resulting in higher energy density. The dry battery separator technology segment dominated the global market in 2022 and accounted for the largest share of above 61.0% of the overall revenue.