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CNTs grown on oxygen-deficient anatase TiO2−δas high-rate composite electrode material for lithium ion batteries

Authors
Journal
Electrochemistry Communications
1388-2481
Publisher
Elsevier
Volume
25
Identifiers
DOI: 10.1016/j.elecom.2012.09.031
Keywords
  • Carbon Nanotubes Composite
  • Oxygen-Deficient Tio2−δ
  • High-Rate Negative Electrode Material
  • Lithium Ion Batteries
Disciplines
  • Chemistry

Abstract

Abstract A CNTs–TiO2−δ composite consisting of carbon nanotubes (CNTs) grown by catalytic chemical vapor deposition on oxygen-deficient titanium dioxide (TiO2−δ) nanoparticles was synthesized and investigated as high-rate negative electrode material for Li-ion batteries. An initial reversible capacity of 185mAhg−1 was obtained at C/2, with an initial irreversible loss of 15%. The composite showed a high stability upon cycling, with 92% retention of the capacity after 37cycles, and good high rate capability, with a capacity of 102mAhg−1 at 10C. The performance of the CNTs–TiO2−δ composite was compared to that of pristine commercial TiO2 and to that of oxygen-deficient TiO2−δwith the aim of identifying the source of the improvement. Both TiO2−δ and CNTs network were found to contribute to the enhanced electrochemical performance of CNTs–TiO2−δ composite.

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