液相共沉淀法制备磷酸亚铁锂研究进展  

Research progress in preparation of LiFePO_4 with liqiud phase co-precipitation methods

作　　者：宁延生[1] 郭西凤[1] 许寒[1] 孙新华[1] 何爱珍[1] 

机构地区：[1]中海油天津化工研究设计院,天津300131

出　　处：《无机盐工业》2010年第9期1-3,共3页Inorganic Chemicals Industry

摘　　要：以磷酸亚铁锂为正极材料的锂离子电池以其高安全、高环保、低价格、长寿命、大容量等特点,将逐步取代现有铅酸电池市场,成为未来动力锂离子电池研究的热点材料。简述了几种常规合成磷酸亚铁锂方法的同时,较系统地介绍了磷酸亚铁锂材料在液相共沉淀制备方法中的研究进展,包括全液相共沉淀法和半液相共沉淀法。指出全液相法合成工艺比较简单、工艺路线较短,但是由于溶液体系中各组分沉淀速度存在差异,因而可能会导致组成的偏离和均匀性的丧失;半液相法虽然增加了工艺流程,但是可以通过控制pH、滴加速度等控制磷铁复合盐的形成,使产品呈球状,进而有助于提高磷酸亚铁锂的振实密度。Lithium-ion batteries with LiFePO4 as cathode material will gradually replace the existing lead-acid batteries and will be the research focus in the field of electrokinetic lithium-ion batteries due to its excellent features,such as extra safety,environmental protection,cheap price,long life,and high capacity.Research progress in preparation of LiFePO4 material with liqiud phase co-precipitation methods,including all-liquid phase co-precipitation method and semi-liquid phase co-precipitation method,was systematically introduced while briefly describing several conventional synthetic methods at the same time.It was pointed out that though the process of all-liquid phase method was simple and short,sedimentation rates of components in solution system were different,which might lead to deviation of composition and loss of uniformity;Whereas,although there was some increase in the process of semi-liquid phase method,the formation of phosphorous-iron complex salt could be controlled by controlling pH and dropping rate etc.,and thus it will make the product in spherical shape,which will be conductive to improve the tap density of LiFePO4.

关 键 词：橄榄石 磷酸亚铁锂 锂离子电池 

分 类 号：TQ131.11[化学工程—无机化工]