product innovation

fiber-based separators: the key to efficient manufacturing and enhanced battery performance

Often disregarded but crucial in every aspect, separators play an important role in battery production and development. delfort’s IonPort^® separators bring significant benefits to both manufacturing efficiency and battery performance.

As a leading supplier of ultralight specialty papers, delfort has developed cutting-edge separators specifically designed for secondary batteries. With its exceptional thermal stability and ability for rapid electrolyte absorption, IonPort^® separators contribute effectively to enhanced and energy-saving cell production.

experience enhanced battery performance with IonPort^® paper-based separator

Thanks to their exceptionally high heat resistance, IonPort^® separators feature almost no shrinkage even at temperatures of up to 320°F (160°C). They maintain their integrity as well as their pore and fiber structure without compromise. This makes IonPort^® safe and the ideal separator for jelly-roll or stack drying and cell baking - manufacturing process steps that allow for the minimization of dry room requirements and, consequently, the associated investment and operating costs.

Cells with the thermally-stable IonPort^® separator can be dried at higher temperatures, reducing drying time by up to 40%. This significantly lowers production time and manufacturing costs.

charge ahead with the power of paper!

Beyond their thermal advantages, IonPort^® separators are characterized by their high surface energy and exceptional wettability. As a result, electrolyte filling can be completed much faster, saving approximately 25% in time. Further, the electrolyte is evenly distributed throughout the cell, reducing cell wetting time by up to 50%.

Compared to a conventional cell assembly process in a dry room, the use of IonPort^® separators in combination with cell baking can reduce manufacturing costs by up to 7.5%.

Moreover, IonPort^® separators positively impact cell performance for a wide range of cell chemistries. Its unique porous cellulose-fiber structure enhances ion flow, boosting charge/discharge rates and extending the battery’s lifespan, whilst featuring the highest battery safety by its thermal stability.

see our papers in action!

Join us at the Advanced Automotive Battery Conference (AABC) in Mainz, Germany, from June 23^rd to June 26^th 2025, at booth 1114!

We’ll be showcasing how paper is driving innovation in energy storage with our fiber-based IonPort^® battery separators. We look forward to seeing you!