| Autor: |
Zheng, Lihao, Shi, Juntao, Ren, Gaoya, Tang, Tiantian, Yang, Yefeng, Shen, Shenghui, Yao, Zhujun |
| Zdroj: |
Energy & Fuels; February 2024, Vol. 38 Issue: 4 p3470-3476, 7p |
| Abstrakt: |
Sulfide solid electrolytes have emerged as highly promising candidates for an all-solid-state battery, while phosphorus-free compounds with air stability have not gotten enough attention. In this study, we focus on an air-stable compound, Li4SnS4, whose structure can be adjusted by Bi3+doping through the combination of a two-step ball milling method and thermal annealing. The successful substitution of Sn4+by Bi3+with lower valence and larger ionic radius results in the enhancement of Li+concentration in electrolytes and lattice volume, benefiting the Li+migration. Therefore, the modified glass-ceramic Li4.025Sn0.975Bi0.025S4exhibits an ionic conductivity of 1.35 × 10–4S cm–1at room temperature, which is twice as high as that of pure Li4SnS4. Moreover, the soft acid characteristic of Bi3+can further ensure the air stability of Li4SnS4based on the hard and soft acid and base theory. The findings revealed from this research provide a potential avenue for improving the performance of air-stable Li4SnS4solid-state electrolytes for future large-scale applications. |
| Databáze: |
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