Journal of Advances in Nanomaterials

Download PDF (2398.8 KB) PP. 39 - 48 Pub. Date: September 12, 2016

DOI: 10.22606/jan.2016.11005

• Yuya Fukuzumi^{1
  1}Graduate School of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8571, Japan
• Wataru Kobayashi^{1234*
  2}Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba 305-8577, Japan
• Yutaka Moritomo^{1234*
  3}Center for Integrated Research in Fundamental Science and Engineering (CiRfSE), University of Tsukuba,Tsukuba 305-8571, Japan

Titanates are promising anode materials for the lithium-ion (LIBs) and sodium-ion (SIBs) secondary batteries due to their high discharge capacity and low voltage. By means of complex impedance spectroscopy (CIS), we investigated the ion dependence of diffusion dynamics in the same host framework, i.e., Na₂Ti₃O₇ and Na₂Ti₆O₁₃. In Na₂Ti₃O₇ with a stepped layered framework, the diffusion constant (DNa = 2.07×10−10cm2/s) of Na+ is comparable to that (DLi = 2.07×10−10cm2/s) of Li+ at ca. 324 K. In Na2Ti6O13 with a tunneled structure, DNa (= 0.16×10^-10cm²/s) is much lower than DLi (= 0.64×10^-10cm²/s) at 298 K. We will discuss the size dependent ion diffusion in terms of the nanostructure of Na₂Ti₃O₇ and Na₂Ti₆O₁₃.

Secondary batteries, anode materials, titanates, ion diffusion, nanomaterial

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