Journal
APPLIED PHYSICS EXPRESS
Volume 7, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/APEX.7.067101
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [23684022]
- Grants-in-Aid for Scientific Research [25620036, 23684022] Funding Source: KAKEN
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The temperature (T) dependence of the sodium ion diffusion coefficient D of a NaxMnO2 thin film is extensively investigated versus x and T using electrochemical impedance spectroscopy. D is found to be 5.0 x 10(-11) cm(2)/s at x = 0.54 at 301 K, which is much larger than the value of 0.7 x 10(-11) cm(2)/s at x = 0.54 at 303 K of a NaxCoO2 thin film. In addition, the activation energy E-a(D) of D (= 0.26-0.32 eV) is smaller than that of NaxCoO2 (= 0.31-0.44 eV). The improved Na+ diffusion properties of NaxMnO2 are interpreted in terms of the larger interlayer distance (d = 5.54 angstrom) of NaxMnO2. (C) 2014 The Japan Society of Applied Physics
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