Journal
JOURNAL OF POWER SOURCES
Volume 239, Issue -, Pages 538-545Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.03.013
Keywords
Nitrogen-doped; Carbon-coating; Surface modification; Lithium titanate
Funding
- NSFC [21073029, 11234013, 51211140045]
- RFDP [20100185110019]
- Program for New Century Excellent Talents in University [NCET-10-0296]
- Fundamental Research Funds for the Central Universities [ZYGX2012Z003]
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We have reported a straightforward strategy to fabricate Li4Ti5O12 composites coated with N-doped carbon layer by using NH3 as N source and sugar as C source, which is a benefit for optimizing carbon layer thickness and tuning atomic ratio of N/C. The composite was synthesized by a conventional solid state reaction with ball milled mixture of TiO2, Li2CO3, and sugar as the precursor, then followed by a high temperature annealing in the atmosphere of Ar and NH3. The choice of titanium source has an impact on the Li4Ti5O12 surface morphology as well as electrochemical properties. N-doped TiO2 can lead to the generation of uniform N-doped C-coating layer, resulting in improved electrochemical performances at high current rate. The N-doped C-coating Li4Ti5O12 obtained by using Anatase TiO2 produces a serrated thin carbon layer, showing the best electrochemical behaviors with the discharge capacity of 100 mAh g(-1) at high rate of 24 C and 92.2% of initial capacity after 800 cycles at 12 C, which should be one of the promising anode materials for hybrid electric vehicles. (C) 2013 Elsevier B.V. All rights reserved.
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