An architectured TiO 2 nanosheet with discrete integrated nanocrystalline subunits and its application in lithium batteries

Long Ren, Yundan Liu, Xiang Qi, K. S. Hui, K. N. Hui, Zongyu Huang, Jun Li, Kai Huang, Jianxin Zhong

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

An anatase TiO 2 nanosheet with discrete integrated subunits was successfully synthesized via a rapid annealing treatment, which could be classified as non-equilibrium conditions on an as-prepared hydrogen titanate nanosheet. This unique TiO 2 nano-object is uniform in length and width as a "sheet-like" shape which is integrated with numerous discrete nanocrystalline subunits. In contrast with the internal architecture of the TiO 2 nanosheets produced under equilibrium and non-equilibrium conditions, the local structure collapse transformation mechanism from the hydrogen titanate nanosheet to the anatase TiO 2 nanosheet with internal architecture is discussed. This unique anatase nano-object electrode exhibits high reversible lithium ion storage capacities and superior cyclic capacity retention at a high current rate. Such enhanced lithium storage performance could be attributed to the discrete subunits aggregation allowing efficient Li + ion diffusion and the interior anisotropy in the nanosheet can be more effective to buffer the volume variation during the lithium insertion/desertion cycle.

Original languageEnglish
Pages (from-to)21513-21518
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number40
Early online date25 Jul 2012
DOIs
Publication statusPublished - 2012

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