Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 19, Pages 5453-5458Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.04.068
Keywords
Lithium-ion batteries; Li4Ti5O12; Li4Ti4.95Nb0.05O12; Anode materials
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Funding
- Chinese Ministry of Education [NECT-07-0307]
- Fundamental Research Funds for the Central Universities, SCUT [2009220038]
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Niobium doped lithium titanate with the composition of Li4Ti4.95Nb0.05O12 has been prepared by a sol-gel method. X-ray diffraction (XRD) and scanning electron microscope (SEM) are employed to characterize the structure and morphology of Li4Ti4.95Nb0.05O12. The Li4Ti4.95Nb0.05O12 electrode presents a higher specific capacity and better cycling performance than the Li4Ti5O12 electrode prepared by the similar process. The Li4Ti4.95Nb0.05O12 exhibits an excellent rate capability with a reversible capacity of 135 mAh g(-1) at 10C, 127 mAh g(-1) at 20C and even 80 mAh g(-1) at 40C. Electrical resistance measurement and electrochemical impedance spectra (EIS) reveal that the Li4Ti4.95Nb0.05O12 exhibits a higher electronic conductivity and faster lithium-ion diffusivity than the Li4Ti5O12, which indicates that niobium doped lithium titanate (Li4Ti4.95Nb0.05O12) is promising as a high rate anode for the lithium-ion batteries. (C) 2010 Elsevier Ltd. All rights reserved.
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