Details

Autor(en) / Beteiligte

• Yao, Yu
• Zhang, Jingjing
• Xue, Leigang
• Huang, Tao
• Yu, Aishui

Titel

Carbon-coated SiO 2 nanoparticles as anode material for lithium ion batteries

Ist Teil von

• Journal of power sources, 2011, Vol.196 (23), p.10240-10243

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• ► Carbon-coated SiO 2 was prepared by covering the nano-SiO 2 with pyrolysed sucrose. ► The C-SiO 2 composite has the capacity of above 500 mAh g −1 at 50th cycle. ► Electrochemical performance of carbon-coated SiO 2 is better than carbon mixed SiO 2. A simple approach is proposed to prepare C-SiO 2 composites as anode materials for lithium ion batteries. In this novel approach, nano-sized silica is soaked in sucrose solution and then heat treated at 900 °C under nitrogen atmosphere. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis shows that SiO 2 is embedded in amorphous carbon matrix. The electrochemical test results indicate that the electrochemical performance of the C-SiO 2 composites relates to the SiO 2 content of the composite. The C-SiO 2 composite with 50.1% SiO 2 shows the best reversible lithium storage performance. It delivers an initial discharge capacity of 536 mAh g −1 and good cyclability with the capacity of above 500 mAh g −1 at 50th cycle. Electrochemical impedance spectra (EIS) indicates that the carbon layer coated on SiO 2 particles can diminish interfacial impedance, which leads to its good electrochemical performance.