Silicon-Coated Carbon Nanofiber Hierarchical Nanostructures for Improved Lithium-Ion Battery Anodes

Document Type

Article

Publication Date

12-2011

Abstract

Silicon-coated carbon nanofibers (CNFs) are a viable method of exploiting silicon's capacity in a battery anode while ameliorating the complications of silicon expansion as it alloys with lithium. Silicon-coated CNFs were fabricated through chemical vapor deposition and deposited onto a carbon fiber mesh. This novel anode material demonstrated a capacity of 954 mAh g−1 in the first cycle, but faded to 766 mAh g−1 after 20 cycles. Structural characterization of the samples before and after cycling was carried out using field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results suggest that a portion of the fade may be due to separation of the silicon coating from the CNFs. Enough silicon remains in contact with the conductive network of CNFs to allow a usable reversible capacity that well exceeds that of graphite. An anode of this material can double the capacity of a lithium-ion battery or allow a 14% weight reduction.

Highlights

► Developed silicon coated carbon nanofiber material for lithium ion batteries. ► Silicon is deposited upon a carbon fiber/carbon nanofiber network. ► CNF structure maintains contact with silicon despite silicon distortion during cycling. ► Material demonstrated 766 mA g−1 reversible capacity after 20 cycles.

DOI

10.1016/j.jpowsour.2011.08.058

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