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POSCO Future M has invested approximately $34.5 million in Factorial Energy to secure supply chains for the production of the Solstice solid-state battery. This partnership aims to enhance material supply and expand production capacity, focusing on the development of sulfide-based batteries that outperform conventional lithium-ion batteries. The investment follows a memorandum of understanding signed in December 2025 and positions POSCO as a strategic partner while enabling Factorial to access a scalable supply chain.