Breadcrumb . Home . News & Media . March 25, 2024 News Release New All-Liquid Iron Flow Battery for Grid Energy Storage. A new recipe provides a pathway to a safe, economical, water-based, flow battery made with Earth-abundant materials Karyn Hede, PNNL Open Lead author and battery researcher Gabriel Nambafu assembles a test flow battery apparatus. (Photo by Andrea Starr Pacific Northwest National Labora...