| Abstract Scope |
Large-scale long-duration energy storage (LDES) technologies play a critical role in commercial deployment of renewable energy into utility grid. Compared to conventional pumped hydro and compressed air technologies, storage batteries are the preferred solution to LDES application due to their fast response, modularity, and higher energy density. However, the commonly used Li-ion batteries (LIBs) are unsafe and too expensive for 4+ hour electricity storage. Redox flow batteries (RFBs) have durability and energy density issues. Searching for alternative LDES technologies is highly desirable. Here we present a new battery chemistry suited for LDES applications. The new battery operates on oxide-ion chemistry with air as the source of oxygen and iron as the medium to store oxygen during charge/discharge cycle. We show the battery can store 12.5 hours energy over multiple cycles with 1” size button cell and 0.5 gram of iron loading. |