Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
Articles
Alkali Ion Transport in Tavorite-Type ABTO4X (A: Li, Na; B-T: Al-P, Mg-S; X: F)
Randy JALEMMasanobu NAKAYAMAToshihiro KASUGA
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JOURNALS OPEN ACCESS

2014 Volume 82 Issue 10 Pages 851-854

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Abstract

The promise of high safety and stability in solid-type electrolytes has prompted many battery researchers to find candidate inorganic compounds to replace existing liquid/polymer-based electrolytes. In this report, the alkali ion transport in tavorite-type ABTO4X (A: Li, Na; B-T: Al-P, Mg-S; X: F) is investigated by ab initio calculation, bond valence path approach, and void space analysis in order to explore their viability as solid electrolytes for all-solid state Li/Na ion batteries. Results from nudged elastic band and bond valence pathway methods reveal that the Li analogues are capable of 1D Li ion diffusion (<0.60 eV) characterized by a zigzag pathway along c-axis and passing between BO4F2 pairs at each intersite jumps. However, the Na analogues show poor ionic conduction as evidenced by the relatively higher Na migration energy (>0.80 eV) for the same pathway due the larger size of the Na ion and the unchanged critical size along the conduction channel.

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© 2014 The Electrochemical Society of Japan
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