摘要
橄榄石结构的磷酸铁锂(LiFePO4)以其价格低廉、热稳定性好和环境友好等优点被认为是一种最具有广阔应用前景的锂离子电池正极材料。但该材料存在电子电导率低、离子扩散系数小、振实密度低等问题,制约了这种材料在锂离子动力电池中的应用。近年来,人们针对这些问题提出了很多解决方案,其中包覆与掺杂是最有效的方法。介绍了近年来国内外在磷酸铁锂包覆与掺杂改性方面的研究进展,包括碳包覆提高其电子导电性、掺入其它元素部分置换二价铁等;同时,还总结目前包覆与掺杂机理以及存在的问题,并对磷酸铁锂改性研究进行了预测和展望。
Olive phase lithium iron phosphate（LiFePO4） is widely recognized as a promising cathode material for lithium ion battery because of its low cost,good thermal stability,benign to environment,and so on.However,LiFePO4 has some drawbacks,such as low electronic conductivity,low ions diffusion coefficient,low tap density,which limit its commercial application in lithium-ion power battery.In recent years,many solutions to overcome these disadvantages have been suggested,and the coating and doping seems to be optimal methods.In this paper,the modification of LiFePO4 by coating and doping was reviewed,including carbon coating to enhance the conductivity,other element doping to partly replace Fe（II）,and etc..Furthermore,some problems and mechanism for coating and doping were summarized,and the prospect for modification of LiFePO4 was predicted.
出处
《电源技术》
CAS
CSCD
北大核心
2011年第3期325-329,共5页
Chinese Journal of Power Sources
基金
国家自然科学基金项目(20673040
20876062
21076089)
关键词
磷酸铁锂
电导率
包覆与掺杂
机理
lithium iron phosphate
conductivity
coating and doping
mechanism
