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http://dx.doi.org/10.4191/kcers.2016.53.3.282

Na-Ion Anode Based on Na(Li,Ti)O2 System: Effects of Mg Addition  

Kim, Soo Hwa (Department of Convergence Materials Science and Engineering, Changwon National University)
Bae, Dong-Sik (Department of Convergence Materials Science and Engineering, Changwon National University)
Kim, Chang-Sam (Center for Energy Convergence Research, Korea Institute of Science and Technology)
Lee, June Gunn (Center for Energy Convergence Research, Korea Institute of Science and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.53, no.3, 2016 , pp. 282-287 More about this Journal
Abstract
This study involves enhancing the performance of the $Na(Li,Ti)O_2$ system as an Na-ion battery anode with the addition of Mg, which partially replaces Li ions. We perform both computational and experimental approaches to achieve a higher reversible capacity and a faster transport of Na ions for the devised system. Computational results indicate that the $Na(Li,Mg,Ti)O_2$ system can provide a lower-barrier path for Na-ion diffusion than can a system without the addition of Mg. Experimentally, we synthesize various $Na_z(Li_y,Mg_x,Ti)O_2$ systems and evaluate their electrochemical characteristics. In agreement with the theoretical study, Mg addition to such systems improves general cell performance. For example, the prepared $Na_{0.646}(Li_{0.207}Mg_{0.013}Ti_{0.78})O_2$ system displays an increase in reversible capacity of 8.5% and in rate performance of 13.5%, compared to those characteristics of a system without the addition of Mg. Computational results indicate that these improvements can be attributed to the slight widening of the Na-$O_6$ layer in the presence of Mg in the $(Li,Ti)O_6$ layer.
Keywords
Sodium-ion battery; P2 phase; Mg substitution; DFT; Barrier energy;
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