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Lithium Extraction from Seawater through Pulsed Electrochemical Intercalation

2020; Elsevier BV; Volume: 4; Issue: 7 Linguagem: Inglês

10.1016/j.joule.2020.05.017

2542-4785

Chong Liu, Yanbin Li, Dingchang Lin, Po‐Chun Hsu, Bofei Liu, Gangbin Yan, Tong Wu, Yi Cui, Steven Chu,

Chemical Synthesis and Characterization

Summary It is highly attractive to develop efficient methods to directly extract Li from seawater to secure the supply of Li. However, high concentration of Na in the seawater poses a great challenge in Li extraction. Here, we developed pulsed-rest and pulse-rest-reverse pulse-rest electrochemical intercalation methods with TiO 2 -coated FePO 4 electrodes for Li extraction. The method can lower the intercalation overpotential and successfully boost the Li selectivity. Moreover, the pulse-rest-reverse pulse-rest method can also promote electrode crystal structure stability during the co-intercalation of Li and Na and prolong the lifetime of the electrode. We demonstrated 10 cycles of successful and stable Li extraction with 1:1 of Li to Na recovery from authentic seawater, which is equivalent to the selectivity of ∼1.8 × 10 4 . Also, with lake water of higher initial Li/Na ratio of 1.6 × 10 −3 , we achieved Li extraction with more than 50:1 of Li to Na recovery.