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Idemitsu Kosan has made a final investment decision to construct a pilot plant for solid electrolytes, essential for solid-state lithium-ion batteries. This facility, in collaboration with Toyota Motor, aims to support the automaker's goal of launching electric vehicles with all-solid-state batteries by 2027-2028.

Idemitsu is developing mass-production technology and currently manufacturing samples at two demonstration facilities. The new pilot plant will have a production capacity of several hundred metric tons per year, with construction at the Chiba plant near Tokyo expected to be completed by 2027. Chiyoda Corp. is contracted for the construction.