Treofan develops thermally stable separator foil for e-mobility


Treofan wants to promote e-mobility with its expertise in separator foils (photo: Treofan)
Treofan wants to promote e-mobility with its expertise in separator foils (photo: Treofan)

The BOPP film specialist Treofan Germany GmbH & Co. KG from Raunheim develops a low-loss, thermally stable and safe separator for lithium-ion battery cells (LIBZ) based on its proven microporous separator film TreoPore. This makes Treofan a partner of the research project "HiT-Cell" (HighTemperature-Cell). The aim is to develop a temperature-stable lithium-ion battery for all mobile and stationary applications.

The new, innovative separator will have a significantly higher temperature stability compared to the polyolefinic separators available today. With this improved property, the new separator film will be particularly suitable for use in lithium-ion battery cells used in electromobility.

Although the ceramic coatings of separators commonly used today increase the safety of lithium-ion battery cells, they cannot always prevent the separators from collapsing under thermal stress. In addition, these coatings lead to additional resistance in the cell. This resistance heats the cell, especially during fast charging and discharging, which can lead to a reduction in service life. The new separator film from Treofan will significantly increase the thermal stability and thus the safety of the battery cell.

“We are delighted to be working with our project partners on this forward-looking project and to use our expertise to advance a key technology for the future,” explains Dr Franz Josef Kruger, head of TreoPore at Treofan.

The project management organisation is the Research Centre Jülich. The project partners are:

·         Treofan (development of the thermally stable separator film)

·         EAS Germany (project management and cell production)

·         Technical University Aachen (further development of electrode production)

·         MEET Münster Electrochemical Energy Technology (development of active electrode materials).

The "HiT-Cell" project is publicly funded by the Federal Ministry of Education and Research (BMBF) in the field of “Battery 2020 - Battery materials for future electromobile and stationary applications” with almost €2M. The project will run until the end of 2020.