Sodium-ion diffusion and ordering in single-crystal P2-NaxCoO2

Shu  GJ; Chou  FC

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Sodium-ion diffusion and ordering in single-crystal P2-NaxCoO2

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Sodium-ion self-diffusion in P2(gamma)-NaxCoO2 has been studied using a single crystal as an electrode. Mass transport and thermodynamic properties of Na ions were measured by the potentiostatic intermittent titration technique on a single-crystal electrode with greater accuracy under well-defined diffusion geometry. Excluding the significantly slower diffusion behavior near particular Na ordered phases, average diffusion coefficients D-Na are extracted to be 1.2 +/- 0.5 X 10(-7) cm(2)/s for x>0.5 and 4.1 +/- 0.5 X 10(-8) cm(2)/s for x<0.5, respectively. The existence of stable phases with special Na ordering of x similar to 0.25, 0.33, 0.43, 0.5, 0.55, and 0.71 are verified by either the maximum or diverging signature of the x-dependent self-diffusion coefficients.

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《Physical review, B. Condensed matter and materials physics》 |2008年第5期|052101-1-052101-4-0|共4页
作者
Shu GJ; Chou FC;
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作者单位

Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan;

Nat Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan;

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正文语种英语
中图分类固体物理学;
关键词
TRANSPORT-PROPERTIES; LITHIUM DIFFUSION; INTERCALATION; CATHODES; LIXCOO2; NONSTOICHIOMETRY; NAXCOO2; BATTERY; GROWTH; LICOO2;

Sodium-ion diffusion and ordering in single-crystal P2-NaxCoO2

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