Toyota has announced a partnership with Japanese petroleum company Idemitsu to develop solid-state batteries for use in electric vehicles (EVs) starting around 2027 or 2028. This collaboration, though somewhat ironic given Idemitsu’s background, aims to leverage the company’s experience with sulfide solid electrolytes.

Toyota’s recent battery technology roadmap has set ambitious goals, with the first generation of solid-state batteries expected to provide an impressive range of over 621 miles (1,000 kilometers) on a single charge. Additionally, fast charging is a key feature, enabling an 80% charge in approximately 10 minutes via DC fast charging. Solid-state batteries offer advantages like enhanced stability in extreme temperatures, rapid energy transfer, and a more compact form factor.

The partnership between Toyota and Idemitsu will progress in three phases. The first phase focuses on improving sulfide solid electrolytes in terms of quality, cost, and production lead times. The second phase involves constructing a large pilot facility to mass-produce solid electrolyte-based batteries, with Toyota focusing on integrating these batteries into its upcoming EVs. The third and final phase will seek solutions for full-scale production and sales of EVs equipped with solid-state batteries.

While a specific timeline for these phases was not provided, both companies are confident that they can address technical challenges related to solid-state batteries, including preventing cracks that can occur between anodes, cathodes, and solid electrolytes during charge and discharge cycles.

Through collaborative research and material technology from both companies, they aim to create durable and high-performance solid-state batteries. Idemitsu’s CEO highlighted the potential of sulfur-based solid electrolytes, which have emerged as a promising solution to address EV battery challenges, such as cruising range and fast charging.

The partnership represents a significant step forward in the development of solid-state batteries for mass-market EVs, promising to enhance performance, range, and convenience for future electric vehicles.