Sodium ion diffusion in layered NaxCoO2

Takayuki Shibata; Wataru Kobayashi; Yutaka Moritomo

doi:10.7567/APEX.6.097101

Sodium ion diffusion in layered NaxCoO2

Takayuki Shibata, Wataru Kobayashi^*, Yutaka Moritomo

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

The temperature dependence of sodium ion diffusion coefficient (D) of Na_xCoO₂ is extensively investigated in the temperature range of 303 ≤ T ≤ 349 K using electrochemical impedance spectroscopy. The magnitude of D is found to be (0:7-1:9) × 10^-11 cm ²/s (0:54 ≤ x ≤ 0:85) at 303 K, which is comparable to that of LiCoO₂. The activation energy (E^D _a ) of D gradually increases from 0.32 at x = 0:54 to 0.51 eV at x = 0:85. The activation energy (E^R _a ) of charge-transfer resistance (R _ct) also increases from 0.34 at x = 0:54 to 0.59 eV at x = 0:85. These behaviors are ascribed to an increase in potential barrier due to the decrease in interlayer distance (d).

Original language	English
Article number	097101
Journal	Applied Physics Express
Volume	6
Issue number	9
DOIs	https://doi.org/10.7567/APEX.6.097101
Publication status	Published - 2013 Sept
Externally published	Yes

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Sodium ion diffusion in layered NaxCoO2 ",

abstract = "The temperature dependence of sodium ion diffusion coefficient (D) of NaxCoO2 is extensively investigated in the temperature range of 303 ≤ T ≤ 349 K using electrochemical impedance spectroscopy. The magnitude of D is found to be (0:7-1:9) × 10-11 cm 2/s (0:54 ≤ x ≤ 0:85) at 303 K, which is comparable to that of LiCoO2. The activation energy (ED a ) of D gradually increases from 0.32 at x = 0:54 to 0.51 eV at x = 0:85. The activation energy (ER a ) of charge-transfer resistance (R ct) also increases from 0.34 at x = 0:54 to 0.59 eV at x = 0:85. These behaviors are ascribed to an increase in potential barrier due to the decrease in interlayer distance (d).",

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AU - Shibata, Takayuki

AU - Kobayashi, Wataru

AU - Moritomo, Yutaka

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N2 - The temperature dependence of sodium ion diffusion coefficient (D) of NaxCoO2 is extensively investigated in the temperature range of 303 ≤ T ≤ 349 K using electrochemical impedance spectroscopy. The magnitude of D is found to be (0:7-1:9) × 10-11 cm 2/s (0:54 ≤ x ≤ 0:85) at 303 K, which is comparable to that of LiCoO2. The activation energy (ED a ) of D gradually increases from 0.32 at x = 0:54 to 0.51 eV at x = 0:85. The activation energy (ER a ) of charge-transfer resistance (R ct) also increases from 0.34 at x = 0:54 to 0.59 eV at x = 0:85. These behaviors are ascribed to an increase in potential barrier due to the decrease in interlayer distance (d).

AB - The temperature dependence of sodium ion diffusion coefficient (D) of NaxCoO2 is extensively investigated in the temperature range of 303 ≤ T ≤ 349 K using electrochemical impedance spectroscopy. The magnitude of D is found to be (0:7-1:9) × 10-11 cm 2/s (0:54 ≤ x ≤ 0:85) at 303 K, which is comparable to that of LiCoO2. The activation energy (ED a ) of D gradually increases from 0.32 at x = 0:54 to 0.51 eV at x = 0:85. The activation energy (ER a ) of charge-transfer resistance (R ct) also increases from 0.34 at x = 0:54 to 0.59 eV at x = 0:85. These behaviors are ascribed to an increase in potential barrier due to the decrease in interlayer distance (d).

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Sodium ion diffusion in layered NaxCoO2

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