Journal
JOURNAL OF POWER SOURCES
Volume 211, Issue -, Pages 133-139Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.03.088
Keywords
High-energy ball-milling; Spinel lithium titanate; Titanium nitride; Nanocomposite; Lithium-ion batteries; Anode material
Funding
- National Natural Science Foundation of China [50902045/E0213, 20971037/B0111]
- Foundation of Scientific Committee of Henan Province of China [082102270040]
- Foundation of Educational Committee of Henan Province of China [2008A150004, 2010GGJS-040]
- Key Laboratory of Novel Thin Film Solar Cells, Chinese Academy of Sciences
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Li4Ti5O12/TiN nanocomposites are fabricated through high-energy ball-milling of the mixture of spinet lithium titanate and TiN powder with different mass ratios of 100:1, 100:2, 100:4, and 100:8 (resultant nanocomposites are denoted as LTO-TiN-1B, LTO-TiN-2B, LTO-TiN-4B, and LIO-TiN-8B). All ball-milled samples exhibit markedly improved electrochemical properties than pristine Li4Ti5O12. Particularly, LTO-TiN-2B electrode has a high capacity of 130 mA h g(-1) at a charge/discharge rate of 20C and the capacity retention was 85% after 1000 cycles at 10C, showing the best electrochemical performance and great potential as an anode material for high-rate lithium-ion batteries. The transmission electron microscopy and X-ray diffraction results indicate that amorphous TiN is generated on the surface of LTO. The improved electrochemical performance may be attributed to TiN which can significantly enhance the electronic conductivity of the nanocomposites. (C) 2012 Elsevier B.V. All rights reserved.
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