Stabilizing Na3SbS4/Na interface by rational design via Cl doping and aqueous processing

•Cl-doped Na3SbS4 is synthesized by aqueous-solution method.•Na3SbS4·8H2O hydrate residual exists in the dehydrated product.•Na3SbS4 transforms to different hydrates with varying exposure time.•Interface stability is improved by residual hydrate, NaCl, and submicro interface.•Cl doping increases the...

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Bibliographic Details
Published in:Journal of materials science & technology 2021-04, Vol.70, p.168-175
Main Authors: Cao, Haonan, Yu, Meiqi, Zhang, Long, Zhang, Zhaoxing, Yan, Xinlin, Li, Peng, Yu, Chuang
Format: Article
Language:English
Subjects:
All-solid-state sodium battery
Chemical synthesis
Interfacial stability
Solid electrolytes
Sulfides
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Summary:•Cl-doped Na3SbS4 is synthesized by aqueous-solution method.•Na3SbS4·8H2O hydrate residual exists in the dehydrated product.•Na3SbS4 transforms to different hydrates with varying exposure time.•Interface stability is improved by residual hydrate, NaCl, and submicro interface.•Cl doping increases the ionic conductivity. Solution-synthesis method is attractive for solid electrolytes because it is a facile and scalable process to be used to permeate electrodes and to construct a thin electrolyte coating layer on active materials. In this work, we report Cl-doped Na3SbS4 prepared via aqueous-solution approach. Besides decent ionic conductivity, the aqueous-solution approached electrolyte demonstrates an improved interfacial stability toward Na metal compared to the solid-state sintered one because of the residual hydrate, nanosized microstructure, and Cl incorporation. All-solid-state batteries using the solution-prepared electrolytes have enhanced cycling performance, though the performance still needs to be further improved.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2020.08.035