Battery-grade lithium carbonate (LiCO) 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 NaCO–LiCl, NHHCO–LiCl, and NH·HO−CO−LiCl, CO purification based on carbonation and decomposition were adopted. The LiCO purity was increased by the improvement of mixing performance. The carbonation time was reduced by 62.5% and 58.3% for the NH·HO−CO and CO purification systems, respectively. In the two ammonia-based systems, LiCO particles with a purity of 99.7–99.8 wt% were one-step prepared with a size of 3–5 μm, which also met the requirement of the battery-grade standard. The purity was further increased to 99.9 wt% by CO purification and LiHCO decomposition. The investigation could provide a feasible alternative for the controllable preparation of battery-grade LiCO in one or multiple steps.

中文翻译：

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利用微流控技术强化电池级 Li2CO3 的合成和纯化

纯度高于99.5wt%的电池级碳酸锂（LiCO）作为高附加值锂盐具有重要意义。然而，不同反应体系和过程控制对产品纯度的影响仍不清楚。在此，膜分散微反应器用于增强均相和非均相系统中制备和纯化过程的传质。采用NaCO-LiCl、NHHCO-LiCl和NH·HO−CO−LiCl的合成体系，采用基于碳酸化和分解的CO净化。通过混合性能的改善提高了LiCO纯度。 NH·HO−CO 和 CO 净化系统的碳酸化时间分别减少了 62.5% 和 58.3%。在两个氨基体系中，一步制备出纯度为99.7-99.8 wt%的LiCO颗粒，尺寸为3-5 μm，也满足电池级标准的要求。通过CO纯化和LiHCO分解，纯度进一步提高至99.9wt%。这项研究可以为一步或多步可控制备电池级 LiCO 提供一种可行的替代方案。