Mercedes-Benz Secured Access to Solid-State Battery Cells
The automaker has finalized an agreement for priority access to ProLogium's advanced Gen4 solid-state battery technology.
Updated on Sept. 24, 2026 in Electric Vehicles
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Mercedes-Benz has gained priority access to ProLogium's Gen4 solid-state battery cells to advance its electric vehicle testing. The partnership marks a significant step in the automaker's plan to integrate next-generation battery architecture into future production vehicles.
Why it matters
This agreement allows Mercedes-Benz to conduct extensive electric, thermal, and safety testing on high-density battery cells. By utilizing ProLogium's non-flammable electrolyte design, the company aims to accelerate its goal of launching a production solid-state EV by 2030.
ProLogium's Gen4 cells achieve an energy density of up to 400 Wh/kg and can charge from 5% to 80% capacity in 6.4 minutes. The company's new Dunkirk facility is projected to reach an annual production capacity of 4.0 GWh by 2030.
The players
Mercedes-Benz
This German luxury automotive manufacturer is a pioneer in the industry and currently focuses on an aggressive transition to an all-electric fleet.
ProLogium
This energy technology company specializes in the development and manufacturing of next-generation solid-state battery solutions.
The details
The collaboration involves rigorous testing of the cells, which feature a ceramic separator and a non-flammable inorganic electrolyte. This process builds upon a long-standing relationship between the two companies that began in 2016.
Timeline
2016: Mercedes-Benz and ProLogium began their collaboration.
May 2024: ProLogium opened its initial gigafactory in Taiwan.
September 2025: Mercedes-Benz conducted tests on Factorial Energy cells in an EQS.
February 2026: A groundbreaking ceremony was held for the Dunkirk, France gigafactory.
September 24, 2026: Mercedes-Benz announced its priority access agreement.
Roadmap
This agreement marks a pivot toward solid-state technology, which is widely viewed as the next evolutionary step beyond current lithium-ion systems. It positions Mercedes-Benz to compete against rival automakers who are also racing to commercialize high-density, faster-charging battery cells.
Drivers can expect future Mercedes-Benz models to offer significantly faster charging times and higher energy density compared to current electric vehicles. These advancements aim to reduce downtime during long trips and improve the overall ownership experience for prospective EV buyers.
The takeaway
Solid-state batteries promise to shorten charging sessions to mere minutes while increasing vehicle range significantly. Buyers should anticipate that these performance gains will gradually become the standard as manufacturing scales over the coming years.
What happens next
ProLogium is expected to finalize its listing on the Nasdaq by the end of 2026.
Further reading
Learn more about the latest innovations in the industry at the Electric Vehicles section.
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