以哈萨克斯坦锂辉石为原料生产锂离子电池电极材料的技术

A. Zhanabayeva, G. Bishimbayeva, D. Zhumabayeva, A. Nalibayeva, Y. N. Abdikalykov
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引用次数: 0

摘要

本研究旨在开发一种用于现代锂电池的创新电极材料的生产技术。开发了一种高效的技术碳酸锂后净化工艺,使其达到电池质量水平(99.95%)。该技术包括技术碳酸锂的苛化,氢氧化锂溶液的超滤和离子交换吸附,然后用碳酸铵沉淀碳酸锂。研究了Purolite S930Plus、Purolite S940和Purolite S950阳离子交换树脂对含锂溶液中钙镁杂质的吸附净化作用。可推荐Purolite S940和Purolite S950作为最有效的阳离子交换剂。采用Purolite S940阳离子交换剂测定了钙镁吸附动力学参数。在室温和0.3 atm的压力下设置碳酸氢盐模式。采用溶胶-凝胶法对合成的磷酸铁锂样品进行了研究。用x射线衍射分析了所得电极材料与磷酸铁锂标准轮廓相对应的结构。在2.5 ~ 4.3 V电势范围内,合成的锂半扣电池结构电极材料具有良好的电化学性能,电池运行稳定,锂离子在样品中具有较高的嵌入可逆性。主要研究成果是利用锂前体——电池级碳酸锂,以国产矿物和技术原料为基础,获得容量显著提高、运行稳定的新一代现代锂离子电池创新正极材料和负极材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A technology for producing electrode materials for lithium-ion batteries from Kazakhstan spodumene raw materials
This study aims to develop a technology for producing innovative electrode materials for modern lithium batteries. An efficient technology for post-purifying of technical lithium carbonate to reach the level of battery quality (99.95%) was developed. This technology involves causticiziation of technical lithium carbonate, ultrafiltration and ion-exchange sorption of a lithium hydroxide solution, followed by precipitation of lithium carbonate with ammonium carbonate. Cation-exchange resins of the brands Purolite S930Plus, Purolite S940 and Purolite S950 were studied for sorption purification of lithium-containing solutions from calcium and magnesium impurities. Purolite S940 and Purolite S950 can be recommended as the most effective cation exchangers. The kinetic parameters of calcium and magnesium sorption were determined using a Purolite S940 cation exchanger. The bicarbonation mode was set at room temperature and a pressure of 0.3 atm. The synthesized samples of lithium-iron-phosphate studied by the sol-gel method. The structures of the obtained electrode materials corresponding to the standard profile of lithium-iron-phosphate were investigated by X-ray diffraction. The synthesized electrode materials in the structure of lithium half- and button cells confirmed their good electrochemical properties, stable operation of batteries and a high intercalation reversibility of lithium ions in the samples within the potential range of 2.5–4.3 V. The main research results are innovative cathode and anode materials of a new generation for modern lithium-ion batteries with significantly increased capacity and stability of operation, obtained from lithium precursors – battery grade lithium carbonate based on domestic mineral and technogenic raw materials.
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