Silicon, flake graphite and phenolic resin-pyrolyzed carbon based Si/C composites as anode material for lithium-ion batteries

Si/C composites, based on nano-Si, flake graphite and phenolic resin-pyrolyzed amorphous carbon, were synthesized by liquid solidification and subsequent pyrolysis. The performances of the prepared Si/C composites are investigated by means of thermogravimetric analysis (TG–DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and galvanostatic cell cycling, as well as cyclic voltammograms. The results indicate that the initial charge capacity of the composites is 640.51 mA h g−1 at a current density of 100 mA g−1 and the initial coulombic efficiency is 73.82%. The Si/C composites also exhibit excellent cycling performances when cycled at different discharge/charge rates.

Graphical abstractSi/C composites, based on nano-silicon, flake graphite and phenolic resin-pyrolyzed amorphous carbon, were synthesized by liquid solidification and subsequent pyrolysis.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The composites were successfully synthesized by liquid solidification–pyrolysis. ► The electrode is further annealed to enhance its electrochemical performance. ► The structure of the composites is very good. ► The material exhibits high specific capacity and excellent cycling performance.