期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 8, 页码 1368-1373出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz5002924
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资金
- National Research Foundation of Korea-Ministry of Education, Science, and Technology [20090072972, 2012K001258, NRF-2010-C1AAA001-0029018]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)-Korea government Ministry of Trade Industry and Energy [20124010203320]
- Supercomputing Center/Korea Institute of Science and Technology Information [KSC-2012-C3-049]
- The Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000307]
Here we designed the kinetically favored Li4Ti5O12 by modifying its crystal structure to improve intrinsic Li diffusivity for high power density. Our first-principles calculations revealed that the substituted Na expanded the oxygen framework of Li4Ti5O12 and facilitated Li ion diffusion in Li4Ti5O12 through 3-D high-rate diffusion pathway secured by Na ions. Accordingly, we synthesized sodium-substituted Li4Ti5O12 nanorods having not only a morphological merit from 1-D nanostructure engineering but also sodium substitution-induced open framework to attain ultrafast Li diffusion. The new material exhibited an outstanding cycling stability and capacity retention even at 200 times higher current density (20 C) compared with the initial condition (0.1 C).
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