Stellantis and U.S.-based battery developer Factorial Energy have validated automotive-sized solid-state battery cells with high energy density, marking a significant step toward introducing the technology in production vehicles by 2026. The announcement builds on their previous commitment to equip a fleet of Dodge Charger Daytonas with solid-state batteries.
The validated cells feature Factorial’s FEST (Factorial Electrolyte System Technology) and deliver an energy density of 375 watt-hours per kilogram (Wh/kg). According to the companies, the 77 ampere-hour (Ah) cells have undergone over 600 charging cycles and are progressing toward automotive qualification—a key milestone for the use of large-format lithium-metal solid-state batteries in electric vehicles.
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The technology promises multiple advantages over traditional lithium-ion batteries. The cells allow for rapid charging, reaching from 15% to 90% in just 18 minutes at room temperature. Additionally, the batteries offer high power output with discharge rates up to 4C, supporting the performance needs of modern electric vehicles.
Factorial also highlighted improvements in operational temperature range, stating that the new electrolyte formulation can perform between -22°F and 113°F (-30°C to 45°C), which could support electric vehicle operation in a wide range of climates.
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“This breakthrough puts us at the forefront of the solid-state revolution, but we are not stopping there,” said Stellantis Chief Engineering and Technology Officer Ned Curic. “We continue working together to push the boundaries and deliver even more advanced solutions, bringing us closer to lighter, more efficient batteries that reduce costs for our customers.”
Siyu Huang, CEO of Factorial Energy, added: “Battery development is about compromise. While optimizing one feature is simple, balancing high energy density, cycle life, fast charging, and safety in an automotive-sized battery with OEM validation is a breakthrough. This achievement with Stellantis is bringing next-generation battery technology from research to reality.”