北京科技大学常志东团队报道了固液反应制备高回收率电池级碳酸锂结晶。相关研究成果于2024年5月10日发表在《颗粒学报》。

碳酸锂（Li₂CO₃）是锂离子电池行业的关键原材料。因此，研究人员提出了一种使用粉末碳酸钠代替其溶液的固液反应结晶方法，最大限度地减少了水的引入，并显著提高了一步锂回收率。通过动力学计算，Li₂CO₃固液反应结晶过程符合Avrami方程，而不是缩核模型，这意味着Na₂CO₃的溶解速率是影响反应过程的最重要因素。

研究人员评价了反应条件如温度和搅拌速度对Li₂CO₃沉淀行为的影响。结果表明，与其他反应条件或搅拌速度相比，温度是最重要的参数。通过使用1.2摩尔比的Na₂CO₃/Li₂SO₄，Li₂CO₃在90°C下的回收率达到93%，纯度达到99.5%。

该方法为电池级Li₂CO₃的高效制备提供了新思路。

附：英文原文

Title: Crystallization of battery-grade lithium carbonate with high recovery rate via solid-liquid reaction

Author: Wei Wang c, Bin Dong a, Zhidong Chang a

Issue&Volume: 2024/05/10

Abstract: Lithium carbonate (Li2CO3) stands as a pivotal raw material within the lithium-ion battery industry. Hereby, we propose a solid-liquid reaction crystallization method, employing powdered sodium carbonate instead of its solution, which minimizes the water introduction and markedly elevates one-step lithium recovery rate. Through kinetic calculations, the Li2CO3 solid-liquid reaction crystallization process conforms by the Avrami equation rather than shrinking core model, which means the dissolution rate of Na2CO3 is the most important factor affecting the reaction process. The effects of reaction conditions such as temperature and stirring speed on the Li2CO3 precipitation behavior were evaluated. The results indicated that temperature is a most essential parameter than other reaction conditions or stirring speed. The exceptional 93% recovery of Li2CO3 at 90 °C with a remarkable purity of 99.5% was achieved by using 1.2 molar ratio of Na2CO3/Li2SO4. This method provides a new idea for the efficient preparation of battery-grade Li2CO3.

DOI: 10.1016/j.partic.2024.05.001

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200124000750