Enhancement of cyclability of urchin-like rutile TiO 2 submicron spheres by nanopainting with carbon

Kyung Soo Park, Kyung Mi Min, Yun Ho Jin, Seung Deok Seo, Gwang Hee Lee, Hyun Woo Shim, Dong Wan Kim

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Phase-pure urchin-like rutile TiO 2 (U-TiO 2) submicron (<1 μm) spheres composed of numerous single-crystalline nanorods are successfully synthesized using a surfactant-free wet-chemical route. In addition, a reliable mechanism for the formation of U-TiO 2, different from the well-known "growth-then-assembly" mode, is suggested. To provide a highly electron-conducting network, the U-TiO 2 submicron spheres are nanopainted with a conductive amorphous carbon layer. As anodes for Li-ion batteries, the carbon-coated U-TiO 2 submicron sphere electrodes show enhanced cycling performance, maintaining a reversible capacity of 165.7 mA h g -1 after 100 cycles at a rate of 0.2 C; this is attributed to the provision of an efficient electron-transport path by the conductive carbon.

Original languageEnglish
Pages (from-to)15981-15986
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number31
DOIs
Publication statusPublished - 2012 Aug 21

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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