Facile Fabrication of CF_x-Pt Composites as a High-Performance Cathode for Primary Lithium Batteries

摘要

In the present work, graphite fluoride-platinum(CF x -Pt) composites synthesized via a novel and simplein situ method are discussed as very promising cathodes for primary lithium-ion batteries. Theinfluence of platinum on the performance of CF x was investigated through X-ray diffraction, X-rayphotoelectron spectroscopy, transmission electron microscopy, high-resolution transmission electronmicroscopy and electrochemical measurements. We found that the emergence of semi-ionic C-F bondsand the uniform dispersion of platinum on the surface of CF x during the modification process are themost important factors for improving the electrochemical performance of the cathode material. Withthe conductivity provided by the platinum, the CF x -Pt cathode achieved a higher discharge capacityand a higher rate capability compared with those of the pristine CF x cathode; the CF x -Pt cathodeexhibited a discharge capacity of 600 mAh g -1 , an excellent power density of 8692 W kg -1 at a currentdensity of 5 C, and a plateau of 2.0 V. More importantly, as a kind of lubricant, CF x makes it difficultto uniformly disperse modifying materials across its surface. However, our method opens a newavenue for the better dispersion of modifying materials on the surface of CF x .