Factorial Energy partners with Mitsui Kinzoku on solid-state batteries — SkimNews
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- Factorial Energy announced a partnership with Mitsui Kinzoku to pair its Solstice all-solid-state battery platform with Mitsui's A-SOLiD argyrodite sulfide solid electrolyte, targeting scalable production
- Mitsui Kinzoku dominates the global market for ultra-thin copper foil used in semiconductors with roughly 90% market share, and will mass-produce its solid electrolyte at a dedicated plant in Saitama, Japan
- Factorial's Solstice platform reaches up to 450 Wh/kg — about 80% higher energy density than traditional lithium-ion — and remains stable at temperatures up to 194°F (90°C)
- A modified Mercedes-Benz EQS drove over 745 miles (1,200 km) on Factorial's 106 solid-state cells a year ago, while Stellantis reported its 77Ah FEST cells hit 375 Wh/kg over 600+ cycles with 15% to 90% charging in 18 minutes
- Factorial has existing EV partnerships with Mercedes-Benz, Stellantis, and Hyundai, plus an MOU with SK On, and received its first passenger-vehicle commercial order in January followed by an aerospace order in July
- CEO Siyu Huang told The New York Times in December that Factorial's solid-state EV batteries could appear in vehicles as early as 2027, likely starting in high-performance or luxury models
Why it matters: Factorial is betting that pairing its Solstice platform with Mitsui's sulfide electrolyte — one of the few companies producing that chemistry at scale — solves the manufacturing bottleneck that has kept solid-state batteries stuck in labs. With Mercedes, Stellantis, and Hyundai already signed on and Huang's 2027 timeline on the record, the alliance moves solid-state batteries from demo-stage curiosity toward actual passenger-EV production, a market currently locked down by conventional lithium-ion.
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