First in US: New solid-state battery passes customer approval

ION Storage Systems, a Maryland-based U.S. battery developer, has achieved a significant milestone by having its solid-state Cornerstone Cell battery technology pass customer performance qualification—the first such validation for a U.S. solid-state battery company. This accomplishment follows the shipment of sample cells in August 2025 to partners across industrial equipment, consumer electronics, and automotive sectors. Passing customer qualification indicates the battery meets stringent commercial standards, enabling ION to move beyond lab testing toward real-world application and large-scale production. The Cornerstone Cell features a novel solid-state, anodeless architecture that replaces the traditional liquid electrolyte and anode with a solid electrolyte, aiming to enhance energy density, thermal stability, and safety compared to conventional lithium-ion batteries. ION’s strategy focuses initially on smaller or specialized applications rather than electric vehicles, mirroring the early market entry path of lithium-ion batteries. This approach is intended to build manufacturing expertise and customer confidence before scaling to larger markets. The company is expanding its Beltsville,