碳化氟化石墨/碳纳米管/纤维素复合纸作为正极的高容量锂氟一次电池

High Capacity Li/CF_x Primary Batteries with Carbonized Fluorinated Graphite/Multiwalled Carbon Nanotubes/Cellulose Fibers Composite Paper as Cathode

利用多壁碳纳米管(MWCNTs)、纤维素(Cellulose fibers)和活性物质氟化石墨(CF1)复合制备成柔性纸,经碳化后,以此碳化CF1-MWCNTs-Cel复合纸作正极组装成锂氟一次电池。采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、热重分析仪(TGA)、X射线衍射(XRD)、X射线光电子能谱分析(XPS)进行结构和性能表征,通过恒流放电和电化学阻抗(EIS)测试电池的电化学性能。结果表明,在相同的放电倍率下,碳化CF1-MWCNTs-Cel复合纸能有效提高Li/CFx一次电池的放电容量和平台稳定性。在放电倍率为2C,碳化CF1-MWCNTs-Cel复合纸和CF1-Al电极作正极时,电池的放电比容量分别为440.4 mAh/g和321 mAh/g,相对于后者,前者对放电比容量的提升高达37%。碳化CF1-MWCNTs-Cel复合纸作电极展现出优异的电化学性能。

Aflexible paper was composited by active material of fluorinated graphite(CF1),multiwalled carbon nanotubes(MWCNTs)and cellulose fibers.After carbonization,the paper was used as cathode to assemble Li/CF x primary batteries.The structures and properties were characterized by scanning electron microscopy(SEM),transmission electron microscopy(TEM),thermal gravimetric analyzer(TGA),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The electrochemical performance was tested by galvanostatic discharge and electrochemical impedance spectroscopy(EIS).At the same discharge rate,CF1-MWCNTs-Cel paper as cathode exhibited higher discharge capacity and discharge plateau than those of CF1-Al electrode as cathode.CF1-MWCNTs-Cel paper and CF1-Al electrodes respectively reached 440.4 mAh/g and 321 mAh/g at 2C,CF1-MWCNTs-Cel paper exhibited a 37%higher capacity than that of CF1-Al electrodes.CF1-MWCNTs-Cel paper as cathode shows excellent electrochemical performance.