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LITHIUM EXTRACTION THROUGH PULSED ELECTROCHEMICAL INTERCALATION METHOD

机译:通过脉冲电化学嵌入方法提取锂萃取方法

摘要

Electrochemical methods using intercalation chemistry to extract Li from seawater using the TiO2-coated FePO4 electrode. The difference in the thermodynamic intercalation potentials, as well as the diffusion barriers between Li and Na, could provide near 100% selectivity towards Li interaction when Li/Na molar ratio is higher than 10-3. For lower Li/Na ratio as in the authentic seawater case, pulsed-rest and pulse-rest-reverse pulse-rest electrochemical methods were developed to lower the intercalation overpotential and it was proven to 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. Finally, 10 cycles of successful and stable Li extraction with 1:1 of Li to Na recovery from authentic seawater were demonstrated, which is equivalent to the selectivity of ~1.8104. Also, with lake water of higher initial Li/Na ratio of 1.6 10-3, Li extraction with more than 50:1 of Li to Na recovery was achieved.
机译:使用嵌入化学的电化学方法使用TiO2涂覆的FEPO4电极从海水中提取Li。热力学插入电位的差异以及Li和Na之间的扩散屏障可以在Li / Na摩尔比高于10-3时为Li相互作用提供接近100%的选择性。对于较低的Li / Na比,与正品海水箱中的比例一样,开发了脉冲 - 静息和脉冲静电脉冲静静力学电化学方法以降低插入过度势,并证明成功提升LI选择性。此外,脉冲静逆脉冲静止方法还可以在Li和Na的共插入期间促进电极晶体结构稳定性并延长电极的寿命。最后,对来自正宗海水的1:1的1:1的10个成功和稳定的Li提取的循环被证明,这相当于〜1.8104的选择性。此外,对于初始Li / Na比为1.6 10-3的湖水,Li萃取,达到50:1的Li达到Na Resuct。

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