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Journal Article
Anode Properties of Titanium Oxide Nanotube and Graphite Composites for Lithium-Ion Batteries
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- Authors
- Min Gyu Choi, Young-Gi Lee, Seung-Wan Song, Kwang Man Kim
- Issue Date
- 2010-12
- Citation
- Journal of Power Sources, v.195, no.24, pp.8289-8296
- ISSN
- 0378-7753
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Titanium oxide nanotube and graphite composites are prepared by adding graphite before and after a hydrothermal reaction to enhance the cyclic performance and high-rate capability of lithium-ion batteries. The composite powders, their anode electrodes, and lithium half-cells containing the anodes are characterized by means of morphological and crystalline analysis, Raman spectroscopy, cyclic voltammetry, impedance spectroscopy, and repeated discharge-charge cycling at low and high C-rates. Notably, the composite anode (R5G5-T) that concurrently uses natural graphite and rutile particles before the hydrothermal reaction shows superior high-rate capability and achieves a discharge capacity of ca. 70 mAh g-1 after 100 cycles at 50 C-rate. This may be due to the high-rate supercapacitive reactions of the TiO 2 nanotube on the graphite surface caused by a diffusion-controlled or a charge-transfer process. © 2010 Elsevier B.V. All rights reserved.
- KSP Keywords
- Charge transfer, Composite Anode, Cyclic voltammetry, Diffusion-controlled, Discharge-charge cycling, Graphite composite, Graphite surface, Half-cell, Hydrothermal reaction, Impedance spectroscopy, Ion batteries