Particle size dependence of the lithium storage capability and high rate performance of nanocrystalline anatase TiO2 electrode

Chunhai Jiang, Mingdeng Wei, Zhimei Qi, Tetsuichi Kudo, Itaru Honma, Haoshen Zhou

Research output: Contribution to journalArticlepeer-review

280 Citations (Scopus)

Abstract

The lithium storage capability and high rate performance of nanocrystalline anatase TiO2 electrodes are highly dependent on the particle sizes. The electrode made from a very fine anatase powder of 6 nm exhibited the highest capacity even at high current rates. It is believed that increasing the specific surface area of the nanocrystalline anatase electrodes has increased the weight ratio of the atoms resided near or on the surface layers and hence improved the surface Li storage; whereas decreasing the particle size has reduced the transport length for Li insertion in the bulk of anatase phase, and so made the Li insertion more efficiently. Besides that, it is found that the specific capacity contributed by the surface Li storage was very stable upon cycling or increasing the current rate; whereas the short Li diffusion length could greatly facilitate the Li insertion/extraction in/from the bulk of the anatase electrode. These two features of nanocrystalline anatase electrodes resulted in very good cycle performance.

Original languageEnglish
Pages (from-to)239-243
Number of pages5
JournalJournal of Power Sources
Volume166
Issue number1
DOIs
Publication statusPublished - 2007 Mar 30
Externally publishedYes

Keywords

  • High rate performance
  • Lithium insertion
  • Nanocrystalline anatase TiO

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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