A new method for direct synthesis of Li2CO3 powders by membrane electrolysis

作     者：Xi-Juan Pan Ting-An Zhang Zhi-He Dou Guo-Zhi Lyu Xiu-Xiu Han Jun-Jie Zhang 

作者机构：School of Metallurgy Northeastern University Shenyang 110819 China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Education Ministry Shenyang 110819China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2018年第37卷第8期

页      面：716-722页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：financially supported by the National Natural Science Foundations of China (No.U1508217 and U1710257) the Fundamental Research Funds for the Central Universities (No.N162505002) 

主　　题：Lithium carbonate Lithium chloride Membrane electrolysis Carbon dioxide 

摘      要：A new method for the direct synthesis of Li2CO3 powders by membrane electrolysis from LiC1 solution is demonstrated in this paper, where a novel electrolysis system combining ventilation, agitation and loop filtration functions was reported. The aim of this work is to explore the effect of the starting concentration of LiC1 on the phase and micromorphology of Li2CO3 crystals and thereafter to explore the mechanism of crystallization and grain growth law. Scanning electron microscopy （SEM） images indicate that the particles become irregular polycrystalline from well-defined flower-like and the micro-crystals change from lamellar to needle-like and subsequently to smaller globular granules, and the surface of the crystals becomes smooth with LiC1 concentration increasing from 50 to 400 g.L^-3. The crystalline phases of the different samples were characterized using powder X-ray diffraction （XRD） and the results prove that pure LiaCO3 crystals can be obtained in a single step by the electrolysis method. The particle size distributions show that both volume mean crystal sizes and the full width at half maximum （FWHM） decrease when the starting LiC1 concentration increases from 50 to 300 g.L 3 and also decreases from 400 to 300 g-L^-3.