Strategic collaboration explores manufacturing infrastructure for Solstice™, a high energy density, solid-state platform designed for extended range and high temperature stability
Factorial Inc. (“Factorial”), the U.S. solid-state battery developer redefining what’s possible in advanced energy systems, and Cartesian Growth Corporation III (“Cartesian III”) today announced that Factorial has signed a Memorandum of Understanding (MOU) for a strategic manufacturing collaboration with Philenergy, Korea’s leading battery equipment and infrastructure provider, intended to accelerate the scale up of Factorial’s groundbreaking Solstice™ all-solid-state battery platform.
Through their collaboration, the companies will explore integrating Philenergy’s world-class production infrastructure and proven supply chain with Factorial’s proprietary battery architecture.
“The companies that win in next-generation batteries won’t just have breakthrough technology – they’ll have production partners experienced in battery manufacturing and capable of delivering at scale,” said Siyu Huang, CEO of Factorial. “Philenergy brings proven production expertise and infrastructure that matches the ambition of Solstice™.”
Philenergy’s advanced manufacturing capabilities – including automated laser notching, precision stacking systems, next-generation winding technology, and intelligent assembly infrastructure – represent the cutting edge of battery production engineering. The company’s modular factory architecture delivers capital efficiency, deployment speed, and operational flexibility that traditional fixed-line approaches cannot match. For Factorial, this could mean reaching volume manufacturing faster while maintaining the rigorous process control demanded by solid-state technology.
“Factorial has established itself as a true technology leader in the solid-state battery space, with deep materials expertise and a clear path toward scalable commercialization,” said Kim Kwang-il, CEO of Philenergy. “The Solstice™ platform represents one of the most advanced solid-state architectures in the industry, combining high energy density with manufacturability. We are proud to support Factorial’s vision and contribute our manufacturing capabilities to help bring this breakthrough technology to global markets.”
Solstice™ delivers what conventional lithium-ion batteries cannot: up to 80% higher energy density while maintaining stable operation at temperatures as high as 90°C – significantly increasing the thermal ceiling of conventional lithium-ion systems. This step change in performance isn’t incremental – it unlocks entirely new applications.
The platform’s breakthroughs extend beyond performance. Solstice™ features a faster formation process and eliminates hazardous solvents through a novel dry cathode architecture, reducing the energy-intensive manufacturing steps and attendant production and environmental impacts of conventional lithium-ion batteries.
As global demand intensifies for energy systems that provide reliable sustained power, perform in extreme conditions, and operate safely under stress, this collaboration positions both companies at the forefront of the battery revolution reshaping transportation, defense, and industrial applications.
