北京化工大学朱吉钦团队报道了微流体技术对电池级Li₂CO₃合成与纯化的工艺强化研究。相关研究成果于2023年12月11日发表于国际顶尖学术期刊《颗粒学报》。

纯度高于99.5wt%的电池级碳酸锂（Li₂CO₃）作为高附加值锂盐是非常重要的。然而，不同反应体系和工艺控制对产品纯度的影响尚不清楚。

该文使用膜分散微反应器来增强均质和非均质系统中制备和纯化过程的传质。采用基于碳酸化和分解的CO₂纯化的Na₂CO₃–LiCl、NH₄HCO₃–LiCl₃和NH₃·H₂OCO₂LiCl的合成体系。混合性能的提高提高了Li₂CO₃的纯度。NH₃·H₂OCO₂和CO₂纯化系统的碳酸化时间分别减少了62.5%和58.3%。

在两种氨基系统中，一步制备了纯度为99.799.8wt%的Li₂CO₃颗粒，颗粒尺寸为35μm，也符合电池级标准的要求。通过CO₂纯化和LiHCO₃分解，纯度进一步提高到99.9wt%。

该研究可以为一步或多步可控制备电池级Li₂CO₃提供可行的替代方案。

附：英文原文

Title: Process intensification for the synthesis and purification of battery-grade Li2CO3 with microfluidics

Author: anonymous

Issue&Volume: 2023/12/11

Abstract: Battery-grade lithium carbonate (Li2CO3) with a purity of higher than 99.5 wt% is of great importance as a high value-added lithium salt. However, influences of different reaction systems and process control on product purity remain unclear. Herein, a membrane dispersion microreactor was used to enhance the mass transfer of preparation and purification processes in homogeneous and heterogeneous system. Synthetic systems of Na2CO3–LiCl, NH4HCO3–LiCl, and NH3·H2OCO2LiCl, CO2 purification based on carbonation and decomposition were adopted. The Li2CO3 purity was increased by the improvement of mixing performance. The carbonation time was reduced by 62.5% and 58.3% for the NH3·H2OCO2 and CO2 purification systems, respectively. In the two ammonia-based systems, Li2CO3 particles with a purity of 99.799.8 wt% were one-step prepared with a size of 35 μm, which also met the requirement of the battery-grade standard. The purity was further increased to 99.9 wt% by CO2 purification and LiHCO3 decomposition. The investigation could provide a feasible alternative for the controllable preparation of battery-grade Li2CO3 in one or multiple steps.

DOI: 10.1016/j.partic.2023.12.001

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200123003188