锂氟电池用高倍率氟化多壁碳纳米管正极材料  

Fluorinated multiwall carbon nanotubes for high rate lithium ion primary batteries

作　　者：陈珑[1] 孙晓刚[1] 邱治文[1] 蔡满园[1] CHEN Long;SUN Xiao-gang;QIU Zhi-wen;CAI Man-yuan(College of Mechantronics Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学机电工程学院,江西南昌330031

出　　处：《新型炭材料》2018年第4期324-332,共9页New Carbon Materials

基　　金：江西省教育厅(KJLD13006);江西省科技厅科研项目(20142BBE50071)~~

摘　　要：研究了相同氟碳比的氟化石墨(F-graphtie)和氟化多壁碳纳米管(F-MWCNTs)的电化学性能。高纯石墨化多壁碳纳米管经氟化处理后,获得一种核壳结构的F-WMCNTs(氟碳原子比C/F=1∶1)。经TEM、XRD、XPS表征表明,F-WMCNTs外层被氟化,形成氟化碳结构,而内层依然保持原有的石墨结构。以此F-WMCNTs作正极活性材料组装成锂氟(Li/CF_x)一次电池。经电化学测试表明,在相同的放电倍率下,对比F-graphite电极(C/F=1∶1),F-WMCNTs电极能够有效提高Li/CF_x一次电池的放电容量和电压平台。大倍率(≥1 C)放电时,尤其明显。当放电倍率为0.05 C时,F-WMCNTs极和F-graphite电极比容量分别为822 m Ah/g和786.1 m Ah/g,F-WMCNTs电极放电容量比F-graphite电极提高4.5%。当放电倍率为2 C时,F-WMCNTs电极和F-graphite电极分别达到375.4 m Ah/g和283.7 m Ah/g,F-WMCNTs电极的放电比容量比F-graphite电极提高了32.2%。F-WMCNTs电极显示出优异的倍率性能。Fluorinated graphite（ F-graphite） and multiwall carbon nanotubes（ F-MWCNTs） were synthesized by direct fluorination with fluorine gas and used as the cathode materials of lithium primary batteries. Their microstructures were characterized by SEM,TEM,XRD and XPS. Results show that the F-MWCNTs have a core-shell structure with the outer layers fluorinated while the inner ones retain their pristine graphitized structure. A F-MWCNT electrode exhibited a higher discharge capacity and a higher discharge plateau than a F-graphite electrode at the same C rates. The discharge capacities of the F-MWCNT and F-graphite electrodes reached 822 and 786. 1 mAh/g at 0. 05 C,respectively. The corresponding values reached 375. 4 and 283. 7 mAh/g at 2 C,indicating an excellent rate performance for the former.

关 键 词：多壁碳纳米管 石墨化 氟化多壁碳纳米管 锂氟一次电池 

分 类 号：TQ127.11[化学工程—无机化工]