The Si@C‐Network Electrode Prepared by an In Situ Carbonization Strategy with Enhanced Cycle Performance

• Published in: ChemElectroChem Vol. 7; no. 24; pp. 4999 - 5004
• Main Authors: Deng, Li, Wu, Zhan‐Yu, You, Jin‐Hai, Yin, Zu‐Wei, Ren, Wen‐Feng, Zhang, Peng‐Fang, Xu, Bin‐Bin, Zhou, Yao, Li, Jun‐Tao
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 14.12.2020
• Subjects: Carbon; carbonic conductive network; Carbonization; Conductivity; Cycles; Electrochemical analysis; Electrodes; in situ carbonization; Li-ion batteries; Nanoparticles; Si@C-network electrode
• ISSN: 2196-0216; 2196-0216
• DOI: 10.1002/celc.202001388

A porous and fluffy Si@C‐network electrode, in which the Si nanoparticles contact with the carbon conductive network, is prepared by an in‐situ carbonization method on a copper collector. Si nanoparticles are uniformly embedded in the 3‐dimensional fluffy carbon network, which could suppress the capacity decay resulting from the Si volume expansion during the cycling process. The Si@C‐network electrode with a high ratio (83.4 wt %) of active Si exhibits long‐term cycling stability (capacity retention of 765 mAh g−1 after 700 cycles at 2100 mA g−1) and good rate performance. The superior electrochemical performance is attributed to the continuous conductive network, which improves the conductivity of electrode and maintains the electrode structure well after 100 cycles. Supportive network: A carbon continuous network acts as conductive and binding components of the electrode providing enhanced electrode conductivity while maintaining the integrity of the electrode structure during charge and discharge processes. Moreover, the porous and fluffy conductive network provides a buffer space for the volume expansion of silicon and boosts the stable cycle performance of the silicon anode.