Highly Conductive, Mechanically Robust, and Electrochemically Inactive TiC/C Nanofiber Scaffold for High-Performance Silicon Anode Batteries

Yan Yao, Kaifu Huo, Liangbing Hu, Nian Liu, Judy J. Cha, Matthew T. McDowell, Paul K. Chu, Yi Cui

Research output: Contribution to journalArticlepeer-review

107 Scopus citations

Abstract

Silicon has a high specific capacity of 4200 mAh/g as lithium-ion battery anodes, but its rapid capacity fading due to >300% volume expansion and pulverization presents a significant challenge for practical applications. Here we report a core-shell TiC/C/Si inactive/active nanocomposite for Si anodes demonstrating high specific capacity and excellent electrochemical cycling. The amorphous silicon layer serves as the active material to store Li+, while the inactive TiC/C nanofibers act as a conductive and mechanically robust scaffold for electron transport during the Li-Si alloying process. The core-shell TiC/C/Si nanocomposite anode shows ∼3000 mAh g-1 discharge capacity and 92% capacity retention after 100 charge/discharge cycles. The excellent cycling stability and high rate performance could be attributed to the tapering of the nanofibers and the open structure that allows facile Li ion transport and the high conductivity and mechanical stability of the TiC/C scaffold. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)8346-8351
Number of pages6
JournalACS Nano
Volume5
Issue number10
DOIs
StatePublished - Oct 11 2011
Externally publishedYes

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