Concentrated electrolytes stabilize bismuth-potassium batteries
| Autor: | Ruding Zhang, Jingze Bao, YuHuang Wang, Chuan-Fu Sun |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Materials science Passivation Potassium chemistry.chemical_element 02 engineering and technology General Chemistry Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry equipment and supplies 01 natural sciences digestive system digestive system diseases 0104 chemical sciences Anode Bismuth Hysteresis Chemistry Chemical engineering chemistry 0210 nano-technology Faraday efficiency |
| Zdroj: | Chemical Science |
| ISSN: | 2041-6520 |
| Popis: | A 5 molar concentrated electrolyte effectively stabilizes bismuth–potassium batteries due to its elevated resistance to electrochemical reduction. Storing as many as three K-ions per atom, bismuth is a promising anode material for rechargeable potassium-ion batteries that may replace lithium-ion batteries for large-scale electrical energy storage. However, Bi suffers from poor electrochemical cyclability in conventional electrolytes. Here, we demonstrate that a 5 molar (M) ether-based electrolyte, versus the typical 1 M electrolyte, can effectively passivate the bismuth surface due to elevated reduction resistance. This protection allows a bismuth–carbon anode to simultaneously achieve high specific capacity, electrochemical cyclability and Coulombic efficiency, as well as small potential hysteresis and improved rate capability. We show that at a high electrolyte concentration, the bismuth anode demonstrates excellent cyclability over 600 cycles with 85% capacity retention and an average Coulombic efficiency of 99.35% at 200 mA g–1. This “concentrated electrolyte” approach provides unexpected new insights to guide the development of long-cycle-life and high-safety potassium-ion batteries. |
| Databáze: | OpenAIRE |
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