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Chlorine-Rich Na 6− x PS 5− x Cl 1+ x : A Promising Sodium Solid Electrolyte for All-Solid-State Sodium Batteries.
- Source :
- Materials (1996-1944); May2024, Vol. 17 Issue 9, p1980, 11p
- Publication Year :
- 2024
-
Abstract
- Developing argyrodite-type, chlorine-rich, sodium-ion, solid-state electrolytes with high conductivity is a long-term challenge that is crucial for the advancement of all-solid-state batteries (ASSBs). In this study, chlorine-rich, argyrodite-type Na<subscript>6−x</subscript>PS<subscript>5−x</subscript>Cl<subscript>1+x</subscript> solid solutions were successfully developed with a solid solution formation range of 0 ≤ x ≤ 0.5. Na<subscript>5.5</subscript>PS<subscript>4.5</subscript>Cl<subscript>1.5</subscript> (x = 0.5), displaying a highest ionic conductivity of 1.2 × 10<superscript>−3</superscript> S/cm at 25 °C, which is more than a hundred times higher than that of Na<subscript>6</subscript>PS<subscript>5</subscript>Cl. Cyclic voltammetry and electrochemical impedance spectroscopy results demonstrated that the rich chlorine significantly enhanced the ionic conductivity and electrochemical stability, in addition to causing a reduction in activation energy. The Na<subscript>5.5</subscript>PS<subscript>4.5</subscript>Cl<subscript>1.5</subscript> composite also showed the characteristics of a pure ionic conductor without electronic conductivity. Finally, the viability of Na<subscript>5.5</subscript>PS<subscript>4.5</subscript>Cl<subscript>1.5</subscript> as a sodium electrolyte for all-solid-state sodium batteries was checked in a lab-scale ASSB, showing stable battery performance. This study not only demonstrates new composites of sodium-ionic, solid-state electrolytes with relatively high conductivity but also provides an anion-modulation strategy to enhance the ionic conductivity of argyrodite-type sodium solid-state ionic conductors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 17
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 177185022
- Full Text :
- https://doi.org/10.3390/ma17091980