摘要
为了实现石墨/纳米碳纤维复合材料用作锂离子电池负极材料的商业化应用,本实验采用了化学气相沉积在石墨颗粒表面原位生长纳米碳纤维包覆的方法制备了石墨/纳米碳纤维复合材料,利用拉曼、扫描电镜以及高分辨透射电镜等手段对纳米碳纤维包覆层中纤维的形貌与微观结构进行研究。研究结果表明:550℃下生长的板式结构的纤维嵌锂容量要高于600℃生长的无序结构和650℃生长的管状结构纤维;纳米碳纤维优良的导电性能能够复合材料的倍率性能;此外,复合材料中纤维比例在5%左右时,循环稳定性好,首次循环库伦效率也较高。
As-grown carbon nanofibers prepared by catalytic chemical vapor deposition（CCVD） are used to enhance the electrochemical performance of the graphite anode material in lithium ion batteries.Morphology and microstructure of CNFs in the composites had been detailedly investigated through scanning electron microscopy（SEM）,Raman spectroscopy and high resolution transmission electron microscopy（HRTEM）.Electrochemical measurements showed that the capacity of G/CNFs composites with grown vertically aligned CNF at 550 ℃ is higher than grown disorderly CNF at 600 ℃ and tubular CNF at 650 ℃,and the rate performance of G/CNFs composites had been improved due to the excellent electrical conductivity of CNF.Moreover,G/CNFs composites will have good cycling stability and high cycling efficiency while the amount of CNF was around 5wt%.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第11期2600-2607,共8页
Journal of Synthetic Crystals
基金
国家重点研发计划专项课题(2016YFB0101205)
关键词
纳米碳纤维
负极材料
微观结构
比表面积
carbon nanofiber
anode material
microstructure
specific surface area
