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A solar-powered electrolysis process extracts lithium from seawater

By Paul Grad |

Today, all commercial lithium is sourced from ores or brines on land, where the total lithium reserves amount to 14 million tons. In contrast, the oceans contain 230 billion tons of lithium, although the lithium concentration in seawater is very low — 0.1 to 0.2 parts per million (ppm). Several methods have been proposed for extracting lithium compounds from seawater, including adsorption- and dialysis-based methods, but the lithium extraction rates by the current techniques are relatively low. Now, researchers from Nanjing University (Nanjing, China; www.nju.edu.cn) have developed a solar-powered electrolysis process to extract lithium from seawater that is said to be faster and more controllable than the current methods, and that it could overcome the limit of the concentration difference present in the dialysis method. The Nanjing team used a lithium superionic conductor Nasicon-type solid-state electrolyte as the Li+-selective membrane, with an aprotic electrolyte instead of an aqueous solution in the anode side of the electrolysis cell to create a proton-free compartment. The prototype device can be powered by a solar panel. The electrolyte is divided into two parts by the solid-state electrolyte. A lithium-perchlorate (LiClO4)/propylene-carbonate…
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