期刊
JOULE
卷 4, 期 7, 页码 1459-1469出版社
CELL PRESS
DOI: 10.1016/j.joule.2020.05.017
关键词
-
资金
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
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 TiO2-coated FePO4 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 similar to 1.8 x 10(4). Also, with lake water of higher initial Li/Na ratio of 1.6 x 10(-3), we achieved Li extraction with more than 50:1 of Li to Na recovery.
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