Vacancy-Controlled Na+ Superion Conduction in Na11Sn2PS12

被引：167

作者：

Duchardt, Marc ^{[1
,2
]}

Ruschewitz, Uwe ^{[2
,3
]}

Adams, Stefan ^{[4
]}

Dehnen, Stefanie ^{[1
,2
]}

Roling, Bernhard ^{[1
,2
]}

机构：

[1] Philipps Univ Marburg, Fachbereich Chem, Hans Meerwein Str 4, D-35043 Marburg, Germany

[2] Philipps Univ Marburg, WZMW, Hans Meerwein Str 4, D-35043 Marburg, Germany

[3] Univ Cologne, Dept Chem, Greinstr 6, D-50939 Cologne, Germany

[4] Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2018年 / 57卷 / 05期

基金：

新加坡国家研究基金会;

关键词：

BVSE calculations; powder X-ray diffraction; preexponential factor; sodium-ion conductor; superionic conductivity; SODIUM-ION BATTERIES; GLASS-CERAMIC ELECTROLYTES; CHALLENGES; NA3SBS4; DESIGN;

D O I：

10.1002/anie.201712769

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Highly conductive solid electrolytes are crucial to the development of efficient all-solid-state batteries. Meanwhile, the ion conductivities of lithium solid electrolytes match those of liquid electrolytes used in commercial Li+ ion batteries. However, concerns about the future availability and the price of lithium made Na+ ion conductors come into the spotlight in recent years. Here we present the superionic conductor Na11Sn2PS12, which possesses a room temperature Na+ conductivity close to 4mScm(-1), thus the highest value known to date for sulfide-based solids. Structure determination based on synchrotron X-ray powder diffraction data proves the existence of Na+ vacancies. As confirmed by bond valence site energy calculations, the vacancies interconnect ion migration pathways in a 3D manner, hence enabling high Na+ conductivity. The results indicate that sodium electrolytes are about to equal the performance of their lithium counterparts.

引用

页码：1351 / 1355

页数：5

共 36 条

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