Sodium Ion Diffusion in Layered NaxCoO2

被引：19

作者：

Shibata, Takayuki ^{[1
]}

Kobayashi, Wataru ^{[1
,2
]}

Moritomo, Yutaka ^{[1
,2
]}

机构：

[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan

[2] Univ Tsukuba, Tsukuba Res Ctr Interdisciplinary Mat Sci TIMS, Tsukuba, Ibaraki 3058571, Japan

来源：

APPLIED PHYSICS EXPRESS | 2013年 / 6卷 / 09期

关键词：

KINETICS; CATHODE;

D O I：

10.7567/APEX.6.097101

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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) x 10(-11) cm(2)/s (0.54 <= x <= 0.85) at 303 K, which is comparable to that of LiCoO2. The activation energy (E-a(D)) of D gradually increases from 0.32 at x = 0.54 to 0.51 eV at x = 0.85. The activation energy (E-a(R)) 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). (c) 2013 The Japan Society of Applied Physics

引用

页数：4

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