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Idemitsu and Toyota partner to advance mass production of all-solid-state batteries for BEVs

Idemitsu Kosan and Toyota Motor have entered into an agreement to work together in developing mass production technology of solid electrolytes, improving productivity and establishment a supply chain, to achieve the mass production of all-solid-state batteries for battery electric vehicles (BEVs).

Through this collaboration, the two companies seek to ensure the successful commercialization of all-solid-state batteries in 2027-28—as announced at the Toyota Technical Workshop in June 2023—followed by full-scale mass production.

Idemitsu has been working on research & development on elemental technologies for all-solid-state batteries since 2001, while Toyota started in 2006.

This collaboration focuses on sulfide solid electrolytes, which are seen as a promising material to achieve high capacity and output for BEVs. Sulfide solid electrolytes are characterized by softness and adhesiveness to other materials, which is suitable for battery mass production.


Solid electrolyte (image courtesy of Idemitsu Kosan)

To prepare for full-scale mass production, both companies have established a task force consisting of dozens of members and will proceed the collaboration as follows:

Phase 1: Development of sulfide solid electrolytes and preparation for a large pilot facility. Through feedback and development support from each other on each company’s technical area, Idemitsu and Toyota will work together on creating better sulfide solid electrolytes with attention to quality, cost, and lead times, which both companies believe will realize mass-production demonstration of sulfide solid electrolytes using an Idemitsu pilot facility.

Phase 2: Mass production using a large pilot facility. Through construction and startup of a large pilot facility, Idemitsu will promote sulfide solid electrolyte manufacture, and then will obtain mass production technology.

Toyota will promote development of both all-solid-state batteries which sulfide solid electrolytes are used and BEV development in which the batteries are incorporated, and then will ensure market launch of BEVs with all-solid-state batteries in 2027-28.

Phase 3: Study of future full-scale mass production. Based on the results of Phase 2, both companies will study of future full-scale mass production and commercialization.

Idemitsu has also been developing production technologies of lithium sulfide which is an intermediate material for solid electrolytes, using by-products which are generated in the course of petroleum refining. Through such development, it has been working on development of mass production technology on sulfide solid electrolytes, aiming to establish a stable supply system.


Idemitsu’s small scale pilot plant

Further, the company is steadily increasing the capacity of its small pilot facility—announced in June 2023—and is proceeding construction plan of a large pilot facility—announced in April 2022—which will contribute to commercialization of all-solid-state batteries in 2027-28.


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