| Autor: |
Longlong Fan, Hong Fang, Puru Jena, Jingfeng Zheng, Yiying Wu, Yang Ren |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
The Journal of Physical Chemistry Letters. 12:7120-7126 |
| ISSN: |
1948-7185 |
| Popis: |
Discovering new K-ion solid-state electrolytes is crucial for the emerging K-batteries to improve energy density, cycle life, and safety. Here, we present a combined experimental and theoretical study of antiperovskite K3OI as a K-ion solid-state electrolyte. A solid-solid phase transition at approximately 240 °C induces an increase in ionic conductivity by 2 orders of magnitude. Anion disorder in the I-O sublattice is found to be a potential mechanism for the observed phase transition. The Ba-doped K3OI sample K2.9Ba0.05OI achieves 3.5 mS cm-1 after the phase transition with a low activation energy of 0.36 eV. Stable cycling of K/K2.9Ba0.05OI/K symmetric cells are observed with a low overpotential of 50 mV at 0.5 mA/cm2 at 270 °C. This study not only reports K3OI as a promising K-ion solid-state electrolyte that is compatible with reactive K metal but also improves the understanding of alkali antiperovskite solid-state electrolytes in general. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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