锂离子电池正极材料LiFePO_4的改性研究  

Research on Modification of the Cathode Material LiFePO_4 for Lithium Ion Battery

作　　者：韩翀[1] 沈湘黔[1] 周建新[1] 

机构地区：[1]江苏大学材料学院,镇江212013

出　　处：《材料导报》2007年第F05期259-262,共4页Materials Reports

摘　　要：橄榄石型结构的磷酸铁锂(LiFePO4)有望成为一种安全性高、价格低、电化学性能优良的锂离子电池的正极材料。然而由于自身晶体结构的本征特性,LiFePO4具有室温下电子导电率低、离子传导率差等缺点,这已成为限制其应用的最大障碍。通过导电碳包覆及金属或金属离子掺杂等改性方法提高这种材料的电子导电率已成为锂离子电池材料领域的研究热点之一。在综述了磷酸铁锂改性研究最新进展的基础上,提出了正极材料LiFePO4未来的主要研究发展方向。Olivine-type lithium iron phosphate （LiFePO4）is a promising cathode material for lithium ion batteries as its characteristics such as high capacity density, low raw material cost, high stabilization and safety, excellent cycling performance and environmental friendliness. However,the intrinsic defects of poor electronic and ionic conductivity and low density have limited its application in industry. To improve electronic conductivity of LiFePO4 by conductive carbon coating and metal particle or ion doping has become one of the hot spots for the research. Recent studies on enhancing the properties of lithium iron phosphate are reviewed and the developing trend is prospected in this paper.

关 键 词：锂离子电池 磷酸铁锂 电子导电率 离子掺杂 

分 类 号：TM912.2[电气工程—电力电子与电力传动]