J. Huang, G.G. Yadav, M. Weiner, G. Cowles
Urban Electric Power Inc.,
United States
Keywords: alkaline, zinc, manganese dioxide, sustainable and scalable technology, grid-ready energy storage
Summary:
Rechargeable alkaline zinc–manganese dioxide (Zn-MnO₂) batteries are transforming the world’s most-produced primary chemistry into a safe, sustainable, and domestically manufactured energy storage platform. Historically limited by MnO₂ phase instability and zinc anode degradation, recent advances in materials design and system engineering have enabled stable rechargeability, long cycle life, and scalability for modern grid applications. At the materials level, the MnO₂ cathode is stabilized to support deep redox cycling without structural collapse, while the optimized zinc anode and gel electrolyte suppress dendrite formation and shape change. A co-designed ion-selective separator prevents zincate crossover and maintains ionic conductivity, ensuring long-term stability. Together, these innovations create a nonflammable, aqueous, and low-cost rechargeable architecture based on earth-abundant materials. The technology is manufactured in New York State at a 10 MWh battery manufacturing and testing facility using water-based, automation-ready processes. Its modular, scalable design enables customization across applications - from compact UPS and backup systems to multi-hour long-duration energy storage (LDES) for renewable integration. Demonstrated systems include a 1 MW/2 MWh indoor installation and distributed solar microgrids with the Navajo Tribal Utility Authority. Rechargeable Zn-MnO₂ offers a practical, U.S.-made solution for safe, low-cost, and sustainable grid-scale energy storage supporting resilient and decarbonized infrastructure.