Continuous Lithium‐Ion Extraction From Seawater and Mine Water With a Fuel Cell System and Ceramic Membranes

The demand for electronic devices that utilize lithium is steadily increasing in this rapidly advancing technological world. Obtaining high‐purity lithium in an environmentally friendly way is challenging by using commercialized methods. Herein, we propose the first fuel cell system for continuous lithium‐ion extraction using a lithium superionic conductor membrane and advanced electrode. The fuel cell system for extracting lithium‐ion has demonstrated a twofold increase in the selectivity of Li + /Na + while producing electricity. Our data show that the fuel cell with a titania‐coated electrode achieves 95% lithium‐ion purity while generating 10.23 Wh of energy per gram of lithium. Our investigation revealed that using atomic layer deposition improved the electrode's uniformity, stability, and electrocatalytic activity. After 2000 cycles determined by cyclic voltammetry, the electrode preserved its stability.