摘要
LiFePO4正极材料具有比容量高、循环寿命长、热稳定性好和环境友好、原材料来源丰富等优点,被认为是锂离子动力电池最佳候选材料之一。但该材料电导率低、离子扩散系数小等问题导致其在大电流放电时容量衰减较大,倍率性能差,制约了其在动力电池领域的应用。使用导电添加剂是一种很有效的方法。碳纳米管(carbon nanotubes,CNTs)具有电导率高、强度高、长径比大等突出优点,是可以取代传统炭黑(CB)或石墨的导电添加剂。综述了近年来国内外对于采用碳纳米管改性磷酸铁锂正极材料的研究进展,并对该材料的应用前景及研究趋势进行了展望。
LiFePO4 has been considered as one of the best cathode materials in lithium-ion power batteries because of its advantages such as high specific capacity, long cycling lifetime, high thermal stability, environment friendliness and rich source of raw materials. However, LiFePO4 has both low electrical conductivity and low diffusion-coefficient of lithium ions. These result in a large decay in capacity under a large-current discharge and poor performance under a high-rate charge/discharge, limiting the application in power batteries. Utilizing conductive additives is an effective method to solve these problems. When compared to conventional carbon black and graphite, carbon nanotubes （CNTs） are better conductive additives because of their advantages such as high electrical conductivity, high strength, and large length-to-diameter ratio. The progress in the research of LiFePO, cathode materials modified by carbon nanotubes was summarized and the application potentials and the research directions were prospected.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第11期2063-2066,共4页
Chinese Journal of Power Sources
关键词
磷酸铁锂
正极材料
碳纳米管
导电添加剂
LiFePO4
cathode materials
carbon nanotubes
conductive additives
