TY - JOUR
T1 - Sodium ion diffusion in layered NaxMnO2 (0.49 ≤ x ≤ 0.75)
T2 - Comparison with NaxCoO2
AU - Shibata, Takayuki
AU - Kobayashi, Wataru
AU - Moritomo, Yutaka
PY - 2014
Y1 - 2014
N2 - 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 × 10-11cm2/s at x = 0.54 at 301 K, which is much larger than the value of 0.7 × 10-11cm2/s at x = 0.54 at 303K of a NaxCoO2 thin film. In addition, the activation energy Ea
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 Å) of NaxMnO 2.
AB - 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 × 10-11cm2/s at x = 0.54 at 301 K, which is much larger than the value of 0.7 × 10-11cm2/s at x = 0.54 at 303K of a NaxCoO2 thin film. In addition, the activation energy Ea
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 Å) of NaxMnO 2.
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U2 - 10.7567/APEX.7.067101
DO - 10.7567/APEX.7.067101
M3 - Article
AN - SCOPUS:84904651555
SN - 1882-0778
VL - 7
JO - Applied Physics Express
JF - Applied Physics Express
IS - 6
M1 - 067101
ER -