With the growing demand for lithium from electric vehicles, efficient recovery of lithium from brines is attracting more attention. However, it is difficult to produce high purity lithium carbonate (Li₂CO₃) from brine in a rapid and energy-efficient manner. In this work, a closed-loop process was developed to recover lithium from brine and produce high-purity Li₂CO₃. The lithium in the brine was first selectively recovered by Electrochemical Deintercalation/Intercalation system (EDIs), and then a high concentration of lithium solution was obtained by precipitation, which replaced the traditional time-consuming evaporation process. The lithium yield of each step was above 87%, and the purity of Li₂CO₃ reached the battery-grade standard after three times washing. In addition, the Fe³⁺ and PO₄^3- used in the process can be reused, and basically no waste residue was generated. This research has potential applications in the rapid concentration of low Li⁺ concentration solution obtained from brine and the preparation of high purity Li₂CO₃.

随着电动汽车对锂的需求不断增长，从卤水中高效回收锂正受到越来越多的关注。然而，很难以快速且节能的方式从盐水中生产高纯度碳酸锂（Li ₂ CO ₃）。在这项工作中，开发了一种从盐水中回收锂并生产高纯度 Li ₂ CO ₃的闭环工艺。盐水中的锂首先通过电化学脱嵌/插层系统（EDI）选择性回收，然后通过沉淀获得高浓度的锂溶液，取代了传统耗时的蒸发过程。各步锂收率均在87%以上，Li ₂ CO纯度₃洗涤3次后达到电池级标准。此外，该工艺中使用的Fe ³⁺和PO ₄ ^3-可重复使用，基本无废渣产生。该研究在盐水中低Li ⁺浓度溶液的快速浓缩和高纯度Li ₂ CO ₃的制备中具有潜在的应用价值。