Modified synthesis of [Fe/LiF/C] nanocomposite, and its application as conversion cathode material in lithium batteries

作者：Prakash Raju^*; Wall Clemens; Mishra Ajay Kumar; Kuebel Christian; Ghafari Mohammad; Hahn Horst; Fichtner Maximilian

来源：Journal of Power Sources, 2011, 196(14): 5936-5944.

DOI：10.1016/j.jpowsour.2011.03.007

• Ferrocene
• Metal fluoride
• Lithium-ion battery
• Carbon nanotube
• Pyrolysis
• Conversion cathode material

In an attempt to enhance the energy storage capacity and discharge voltage, a new cathode material based on ferrocene and LiF for lithium-ion batteries has been explored [Fe/LiF/C] nanocomposite (1) has been synthesized by pyrolysis of a ferrocene/LiF mixture at 700 degrees C using a rotating quartz tube setup in a furnace. The structure and morphology of the composite were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Brunauer-Emmer-Teller (BET) analysis, Raman, and Mossbauer spectroscopy. The nanocomposite is composed of well-defined nanotubes which are interlinked by graphitic shell-type structures containing uniformly distribution of Fe, Fe-C, and LiF nanoparticles. The binder-free nanocomposite cathode showed enhanced electrochemical performance with the reversible specific capacity of 230 mAh g(-1) (1.3-4.3 V) at 20.8 mAg(-1) at room temperature. It exhibited a remarkable cyclic stability and good rate capability performances. The morphology of 1 was changed by ball milling, and the resulting nanocomposite 2 did not show any cyclic stability as a cathode. Thus, the cyclic stability and rate capability performances of 1 were attributed to its structure and morphology.

• 出版日期2011-7-15