Here, we report a new battery capable of efficiently recovering lithium from brines that is composed of a lithium-capturing cationic electrode (LiFePO4) and a chloride-capturing anionic electrode (Ag). It can convert a sodium-rich brine (Li:Na = 1:100) into a lithium-rich solution (Li:Na = 5:1) by consuming 144 W h per kg of lithium recovered.
