Reversible Li-storage in Titanium(III) Oxide Nanosheets

Hee Jo Song, Jae Chan Kim, Chan Woo Lee, Sangbaek Park, Mushtaq Ahmad Dar, Seong Hyeon Hong, Dong-Wan Kim

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Abstract

For the first time, the basic electrochemical properties and battery performances of titanium(III) oxide (Ti<inf>2</inf>O<inf>3</inf>) are reported in bulk and nanoscale powder forms in view of their potential applications for lithium ion battery electrodes. Ti<inf>2</inf>O<inf>3</inf> reacts electrochemically with Li<sup>+</sup> ions between 3.0 V and 0.01 V, and exhibits excellent cycling stability due to its relatively high electrical conductivity. Reactions between Li<sup>+</sup> ions and Ti<inf>2</inf>O<inf>3</inf> molecules are shown to proceed via intercalation of the former into the latter. To increase the electrochemical reactivity of Ti<inf>2</inf>O<inf>3</inf>, nanoscale Ti<inf>2</inf>O<inf>3</inf> particles with and without graphene were prepared using a facile high-energy milling process. After milling, the specific discharge capacity of the nanoscale Ti<inf>2</inf>O<inf>3</inf> with nanosheet morphology was 161 mA.h.g<sup>-1</sup> at the 300th cycle at a current density of 33 mA.g<sup>-1</sup>. By combining graphene on the Ti<inf>2</inf>O<inf>3</inf> nanosheets uniformly, the specific capacity was further improved to 248 mA.h.g<sup>-1</sup> at the 300th cycle. Furthermore, rate capability of these composite electrodes was enhanced significantly even at high current rates.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalElectrochimica Acta
Volume170
DOIs
Publication statusPublished - 2015 Apr 24

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Keywords

  • anode
  • lithium ion battery
  • nanosheet high energy milling
  • Ti<inf>2</inf>O<inf>3</inf>

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

Song, H. J., Kim, J. C., Lee, C. W., Park, S., Dar, M. A., Hong, S. H., & Kim, D-W. (2015). Reversible Li-storage in Titanium(III) Oxide Nanosheets. Electrochimica Acta, 170, 25-32. https://doi.org/10.1016/j.electacta.2015.04.113