Fabrication and Electrochemical Performance of Br-Doped Na<sub>3</sub>PS<sub>4</sub> Solid-State Electrolyte for Sodium–Sulfur Batteries via Melt-Quenching and Hot-Pressing
Room-temperature all-solid-state sodium–sulfur (Na-S) batteries are being regarded as a promising technology for large-scale energy storage. However, the low ionic conductivity of existing sulfide solid electrolytes has been hindering the potential and commercialization of Na-S batteries. Na<sub&...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
|
| Series: | Inorganics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6740/13/3/73 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Room-temperature all-solid-state sodium–sulfur (Na-S) batteries are being regarded as a promising technology for large-scale energy storage. However, the low ionic conductivity of existing sulfide solid electrolytes has been hindering the potential and commercialization of Na-S batteries. Na<sub>3</sub>PS<sub>4</sub> has garnered extensive attention among sulfide solid electrolytes due to its potential ionic conductivity (primarily predominated by vacancies) and ease of fabrication. Herein, we demonstrated a combined melt-quenching with Br doping technique to pre-generate abundant defects (vacancies) in the Na<sub>3</sub>PS<sub>4</sub>, which expanded ion transport channels and facilitated Na<sup>+</sup> migration. The quenched Na<sub>2.9</sub>PS<sub>3.9</sub>Br<sub>0.1</sub> holds an ionic conductivity of 8.28 × 10<sup>−4</sup> S/cm at room temperature. Followed by the hot-pressed fabrication at 450 °C was conducted on the quenched Na<sub>2.9</sub>PS<sub>3.9</sub>Br<sub>0.1</sub> to reduce interface resistance, the resultant Na<sub>2.9</sub>PS<sub>3.9</sub>Br<sub>0.1</sub> pellet shows an ionic conductivity up to 1.15 × 10<sup>−3</sup> S/cm with a wide electrochemical window and chemical stability towards Na alloy anodes. The assembled all-solid-state Na<sub>2</sub>S/Na<sub>2.9</sub>PS<sub>3.9</sub>Br<sub>0.1</sub>/Na<sub>15</sub>Sn<sub>4</sub> cell delivers an initial reversible capacity of 550 mAh/g at a current density of 0.1 mA/cm<sup>2</sup>. After 50 cycles, it still maintains 420 mAh/g with a capacity retention of 76.4%. The integration of melt-quenching, doping, and hot-pressing provides a new strategy to enable sulfide electrolytes with high ionic conductivity and all-solid-state Na-S batteries with high performance. |
|---|---|
| ISSN: | 2304-6740 |