Seawater Batteries Emerge as Promising Renewable Energy Storage Solution
Seawater batteries (SWBs) are being developed as a promising technology for large-scale renewable energy storage, utilizing sodium ions from seawater as the active material. Unlike traditional sealed batteries, SWBs have an open component that interacts with seawater and oxygen. During charging with renewable electricity, the battery traps sodium from saltwater at its negative pole, and during discharge, sodium returns to the sea, releasing stored electricity. These batteries employ a NASICON-type solid separator, a high-strength ceramic material, to maintain stability and prevent degradation from seawater, acting as a selective filter for sodium ions. This technology is currently in the research phase, with prototypes progressing from small button batteries to larger, modular units designed for industrial facilities, docks, and offshore generation parks.