Ultraconcentrated Sodium Bis(fluorosulfonyl)imide-Based Electrolytes for High-Performance Sodium Metal Batteries
| Autor: | Jeong-Hee Choi, Sang-Min Lee, Kisuk Kang, Nam-Soon Choi, Kyu-Tae Lee, Hyungsub Kim, Yongwon Lee, Jaegi Lee, Mi-Sook Kwon, Jeongmin Lee |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Sodium Inorganic chemistry chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention Corrosion Anode Metal chemistry law visual_art visual_art.visual_art_medium General Materials Science 0210 nano-technology Polarization (electrochemistry) Faraday efficiency |
| Zdroj: | ACS Applied Materials & Interfaces. 9:3723-3732 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b14878 |
| Popis: | We present an ultraconcentrated electrolyte composed of 5 M sodium bis(fluorosulfonyl)imide in 1,2-dimethoxyethane for Na metal anodes coupled with high-voltage cathodes. Using this electrolyte, a very high Coulombic efficiency of 99.3% at the 120th cycle for Na plating/stripping is obtained in Na/stainless steel (SS) cells with highly reduced corrosivity toward Na metal and high oxidation durability (over 4.9 V versus Na/Na+) without corrosion of the aluminum cathode current collector. Importantly, the use of this ultraconcentrated electrolyte results in substantially improved rate capability in Na/SS cells and excellent cycling performance in Na/Na symmetric cells without the increase of polarization. Moreover, this ultraconcentrated electrolyte exhibits good compatibility with high-voltage Na4Fe3(PO4)2(P2O7) and Na0.7(Fe0.5Mn0.5)O2 cathodes charged to high voltages (>4.2 V versus Na/Na+), resulting in outstanding cycling stability (high reversible capacity of 109 mAh g–1 over 300 cycles for the Na/Na4F... |
| Databáze: | OpenAIRE |
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