Umicore and Idemitsu Kosan Co. Ltd. have agreed to jointly develop high-performance catholyte materials for solid-state batteries, combining their respective expertise in cathode active materials and solid electrolytes, and aiming to provide the technological breakthrough to extend the driving range and thereby propel e-mobility. Umicore brings its expertise in a variety of cathode active materials (CAM) for lithium-ion batteries, while Idemitsu Kosan brings its know-how in solid electrolytes as a key material for all-solid-state lithium-ion batteries (ASSB).

Umicore has been working on solid-state CAM chemistries since 2017 and holds multiple key patents in this technology field. Idemitsu Kosan has an established method for manufacturing high-purity lithium sulfide, which it developed in its petrochemical business, and holds many patents for sulfide solid electrolytes that use lithium sulfide as their raw material. Catholytes combine cathode active materials and solid electrolytes.

The more intimate contact between these two components would enable the solid-state battery to achieve better performance. Solid-state batteries are the next-generation batteries with performance improvements on several fronts. In cars, for example, their higher energy density will increase the driving range and allow for faster charging.

The replacement of today's liquid electrolyte with a solid one will enhance the safety and lifespan of batteries, reduce their size, weight and ultimately, cost.