Toyota and Sumitomo Metal make progress on solid-state battery materials

Toyota Motor and Sumitomo Metal Mining announced progress in developing cathode materials for next-generation all-solid-state batteries, a key technology for future electric vehicles. The two Japanese companies, collaborating since 2021, have now created a highly durable cathode material designed to resist degradation during repeated charging cycles.

The partners said the breakthrough uses Sumitomo Metal’s proprietary powder synthesis technology, which enhances battery stability and lifespan. They plan to work jointly on improving performance, safety, and cost efficiency, aiming for the world’s first practical solid-state EV battery.

Solid-state batteries promise faster charging, greater safety, and longer lifespans than conventional lithium-ion systems, but remain limited by high costs and complex production methods. Toyota, the world’s largest automaker, plans to introduce EVs with solid-state batteries by 2027 or 2028.

Sumitomo Metal said it aims to begin mass production of the new cathode material by April 2028, prioritizing supply to Toyota before expanding to other customers.

The partnership underscores Japan’s push to lead the global solid-state battery race. Toyota is also working with Idemitsu Kosan, which is developing lithium sulphide, another vital component for solid-state battery technology.