吸附耦合电化学技术从高钠盐水中高效提取锂,ACS Sustainable Chemistry & Engineering

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吸附耦合电化学技术从高钠盐水中高效提取锂
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-08-09 , DOI: 10.1021/acssuschemeng.1c02442
Ying Sun ₁ , Yunhao Wang ₁ , Yang Liu ₁ , Xu Xiang ₁

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由于电动汽车、储能设备等电子产品的快速发展，对锂资源的需求不断增加。由于卤水锂资源的优势，从盐湖卤水中提取锂具有重要意义。由于钠离子和锂离子都是一价阳离子，化学性质相似，因此很难从高钠盐水中提取锂。在此，吸附耦合电化学（ACEC）技术被用于锂提取。通过前体方法获得的涂覆有超薄（1-2 nm）碳层（核@壳MnO _x @C）的氧化锰用作膜电容装置中的膜电极。MnO _x的晶体结构和碳层厚度@C 通过调整制备条件得到有效控制。当核心主要为MnO相时，膜电极的锂提取能力显着提高。锂吸附量高达51.8 mg/g，从高钠盐水（Na/Li比=48.6）吸附时间为550 s。反向过程中锂离子的解吸率为91.3%。与膜电容或吸附方法相比，该技术达到的吸附容量处于领先地位。吸附和法拉第氧化还原反应的协同作用显着提高了锂提取能力。这种 ACEC 技术提供了一种高效且易于操作的从盐水中提取锂的替代途径。

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Highly Efficient Lithium Extraction from Brine with a High Sodium Content by Adsorption-Coupled Electrochemical Technology

The demand for lithium resources continues to increase due to the rapid development of electronic vehicles, energy storage equipment, and other electronic products. Extracting lithium from salt lake brines is of great significance because of the predominance of brine lithium resources. Because both sodium and lithium ions are monovalent cations and have similar chemical properties, it is difficult to extract lithium from high-sodium brine. Herein, an adsorption-coupled electrochemical (ACEC) technology was utilized for lithium extraction. Manganese oxide coated with an ultrathin (1–2 nm) carbon layer (core@shell MnO_x@C), obtained by a precursor method, is utilized as a membrane electrode in a membrane capacitive device. The crystal structure and carbon layer thickness of MnO_x@C are effectively controlled by adjusting the preparation conditions. When the core is mainly a MnO phase, the lithium extraction capability of the membrane electrode is significantly improved. The lithium adsorption capacity reaches as high as 51.8 mg/g, and the adsorption time is 550 s from high-sodium brine (Na/Li ratio = 48.6). The desorption rate of lithium ions is 91.3% during a reverse process. Compared with either membrane capacitance or adsorption methods, the adsorption capacity reached with this technology is in the lead. The synergy of adsorption and Faradaic redox reactions leads to remarkably enhanced lithium extraction capability. This ACEC technology provides an alternative pathway to extract lithium from brines with high efficiency and facile operation.

更新日期：2021-08-23

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