磷酸铁锂的液相合成及改性研究进展

橄榄石结构的LiFePO_4以其高比容量、低成本、环境友好、热稳定性良好等优点而成为一类最具发展前景的锂离子电池正极材料,但电导率和离子扩散率低是制约其在动力电池领域广泛应用的主要障碍.从材料制备和改性等方面综述了近年来国内外利用液相法合成LiFePO_4以及掺杂改性的研究状况,比较了水热法、共沉淀法、溶胶-凝胶法及掺杂对材料性能的影响,认为合成材料的形貌和粒径以及导电剂或少量金属离子的掺杂是提高LiFePO_4电导率的有效方法,指出今后的重点方向是合成工艺的改进和理论的继续深入研究.

Research Progress in Preparation and Modification of LiFePO_4 Using Wet-chemical Approaches

The olivine LiFePO_4 is viewed widely as the most promising cathode material for lithium ion battery due to its high specific capacity, lower cost,environmental benignancy,good thermal stability,etc. Exploring new synthesis methods which can reduce energy consumption and cost, and improve electrochemical performance of LiFePO_4 through modification have become research hotspots nowadays. Compared with solid-state synthetic methods, wetchemical approaches have attracted more and more attention because of their simple procedure, low consumption,small particle size of product,and uniform particle size distribution. In this paper,the researches of recent years for the synthesis of LiFePO_4 are reviewed systematically; furthermore, the modification by addition conductive materials and metal ions doping is also introduced.