High Reversible Capacity Si/C Composite Anodes for Lithium-Ion Rechargeable Batteries

作者：Qi Peng; Chen Yungui^*; Zhu Ding; Xu Chenghao; Huang Lihong; Duan Xiaobo

来源：Rare Metal Materials and Engineering, 2014, 43(5): 1073-1078.

DOI：10.1016/s1875-5372(14)60103-x

• Mg
• SiO
• Si/C composite
• anode
• lithium batteries

A high reversible capacity Si/C composite was synthesized by a thermal pyrolysis of citric acid embedded with fine graphite and silicon powders. The silicon was produced via an in-situ redox reaction between Mg and SiO. The structure, the morphology and the electrochemical performance of the materials were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), electrochemical tests, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Compared with the pristine silicon, the as-prepared composite exhibits much better electrochemical properties, which has a high reversible capacity of 780 mAh center dot g(-1) at the 40th cycle with a retention up to 88.6%. The improved performance is mainly attributed to the uniform distribution of Si nanoparticles within the carbon matrix with buffering effect and excellent electric conductivity.

• 出版日期2014-5
• 单位四川大学