Factorial partners with Mitsui on solid-state battery mass production
Factorial Energy makes solid-state batteries. It partnered with Mitsui Kinzoku to mass-produce its Solstice platform. This moves the technology closer to commercial use.
Solid-state batteries offer much higher energy density than today's lithium-ion cells. The biggest challenge has been growing production to scale.
US-based Factorial Energy partnered with Mitsui Kinzoku to solve this problem. Mitsui is one of the few companies that make solid electrolytes.
Mitsui is a Japanese electronics and materials company. It will mass-produce the solid electrolyte at a plant in Saitama, Japan.
Factorial's Solstice platform offers up to 450 Wh/kg energy density. This is 80% higher than lithium-ion batteries.
It works at temperatures up to 90°C. The company has partnerships with Mercedes-Benz, Stellantis, and Hyundai for electric vehicles.
It secured commercial orders starting in January 2026.
- 450 Wh/kg, 80% higher than lithium-ion
- Solstice energy density
- Saitama, Japan
- Production location
- Up to 90 degrees Celsius
- Operating temperature
Why it mattersSolid-state batteries could extend electric vehicle driving range. They could reduce charging time as well. This makes electric vehicles more practical for everyday drivers.
AustraliaNo direct Australian effect yet, but if solid-state batteries reach mass production, they could improve EV range and affordability for Australian buyers in coming years.
✓ Claims checked against the source. checked 7 d ago
