液相法合成磷酸铁锂正极材料

发布时间：2018-11-14 08:30

【摘要】：液相合成法具有传热、传质快,材料粒径、形貌可控等优点,被广泛应用于各类材料制备领域。本文综述了共沉淀法、溶剂热法、sol-gel法合成磷酸铁锂正极材料的过程、原理和研究进展,并进行了对比和总结:纳米化、高比表面积、碳包覆,可以解决电子电导率低和锂离子扩散速率慢所导致的倍率性能差的问题,是液相法合成的基本要求。共沉淀法有利于合成密堆积的球形形貌,获得高振实密度的材料,可以提高材料的能量密度。溶剂热法有利于合成大(010)面的材料,缩短锂离子扩散的距离,提高材料的倍率性能。Solgel法可以达到分子级别的混合,有利于制备成分均匀、原位碳包覆的材料。使用高电子电导率和离子电导率的材料,可以提高Li Fe PO4的倍率性能。相对固相法,寻找合成时间短、流程短、成本低的产业化方法,推动液相法在原理、工艺上的发展和进步是研究的方向。
[Abstract]:Liquid phase synthesis is widely used in the preparation of various materials because of its advantages of heat and mass transfer, particle size and controllable morphology. In this paper, the process, principle and research progress of the synthesis of lithium iron phosphate cathode materials by coprecipitation, solvothermal and sol-gel methods are reviewed, and compared and summarized: nanocrystalline, high specific surface area, carbon coating, and so on. It can solve the problem of low electronic conductivity and low diffusion rate of lithium ion, which is the basic requirement of liquid phase synthesis. The coprecipitation method is propitious to the synthesis of the spherical morphology of dense packing and the material with high vibrational density can increase the energy density of the material. The solvothermal method is beneficial to the synthesis of large (010) surface materials, shortens the diffusion distance of lithium ions, and improves the ratio performance of the materials. The Solgel method can achieve molecular level mixing, which is conducive to the preparation of materials with homogeneous composition and in situ carbon coating. The rate performance of Li Fe PO4 can be improved by using materials with high electronic conductivity and ionic conductivity. Compared with solid phase method, the research direction is to find the industrialization method with short synthesis time, short process and low cost, and to promote the development and progress of liquid phase method in principle.
【作者单位】：昆明理工大学真空冶金国家工程实验室云南省先进电池和材料实验室锂离子电池及材料制备技术国家地方联合工程实验室;
【基金】：国家自然科学基金项目(No.51364021) 云南省自然科学基金项目(No.2014FA025) 云南省院士自由探索项目(No.2015HA016,2016HA011)资助~~
【分类号】：TM912

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