Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 24, Pages 8289-8296Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.06.104
Keywords
Lithium-ion battery; Anode active material; Titanium oxide nanotube; Graphite
Funding
- Ministry of Education, Science and Technology [2009-0082120]
- National Research Foundation of Korea [2009-0082120] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 mAhg(-1) after 100 cycles at 50 C-rate. This may be due to the high-rate supercapacitive reactions of the TiO2 nanotube on the graphite surface caused by a diffusion-controlled or a charge-transfer process. (c) 2010 Elsevier B.V. All rights reserved.
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