碳纳米管制备石墨烯片及其储锂性能研究  

Preparation of Graphene Sheets by Carbon Nanotubes and Its Lithium Storage Properties

作　　者：白利忠[1] 李方[1] 赵东林[2] 

机构地区：[1]中北大学材料科学与工程学院,太原030051 [2]北京化工大学碳纤维及功能高分子教育部重点实验室,北京100029

出　　处：《材料导报》2016年第18期34-37,共4页Materials Reports

基　　金：国家自然科学基金(50672004)

摘　　要：用多壁碳纳米管作为起始原料,通过化学氧化、离心分离、高温膨胀和超声剥离等步骤制备了石墨烯片。采用透射电子显微镜(TEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)对石墨烯片的形貌和结构进行分析。通过恒流充放电和交流阻抗测试研究了石墨烯片作为锂离子电池负极材料的储锂性能。结果表明,石墨烯片在50mA/g的电流密度下,首次可逆比容量为859mAh/g,经过50次循环后比容量仍保持在410mAh/g,远高于碳纳米管(217mAh/g),表明石墨烯片具有优异的储锂性能。Graphene sheets（GSs） were prepared from carbon nanotubes（CNTs） by chemical oxidation, centrifugal separation, high thermal expansion and ultrasonic treatment. The morphology and structure of the GSs were systematically investigated by transmission electron microscope（TEM）, X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FT-IR）. Lithium storage properties of the GSs were investigated by galvanostatie charge- discharge and electrochemical impedance spectroscopy. It was found that the GSs electrode exhibited a relatively high reversible capacity of 859 mAh/g at a current density of 50 mA/g. After 50 cycles, the reversible capacity of the GSs electrode was kept at 410 mAh/g, which was much higher than carbon nanotubes electrode. These results indicate that the graphene sheets possess excellent electrochemical performances for lithium storage.

关 键 词：石墨烯片 多壁碳纳米管 储锂性能 负极材料 

分 类 号：TM912.9[电气工程—电力电子与电力传动]