Taiwanese solid-state firm building an oxide-class production line, partnered with Mercedes-Benz.
The best demonstrated cell reaches 410 Wh/kg against 250 for conventional Li-ion — but conventional packs cost $115/kWh, and solid-state has to ride that curve down. No solid-state cell is in a series-production vehicle yet.
ProLogium — Gen 3.5 Lithium Ceramic Battery, Taoyuan, Taiwan — ProLogium began mass production of its Gen 3.5 Lithium Ceramic Battery at its Taiwan giga-plant on 2 Sep 2026. The 185.4 Ah large-format cell measured 381 Wh/kg and 903 Wh/L in third-party TÜV testing, and qualifies as all-solid-state under GB/T 43568-2026: after six hours under vacuum at 120°C it lost under 0.05% of its weight, against a 0.5% ceiling. The energy density and the classification are independently measured, which is rare in this field; what the announcement does not give is a production volume, a cost, or a named vehicle programme.
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