High-Rate Nanostructured Pyrite Cathodes Enabled by Fluorinated Surface and Compact Grain Stacking via Sulfuration of Ionic Liquid Coated Fluorides
| Autor: | Ye Zhang, Keyi Chen, Chilin Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
High rate
Materials science General Engineering Stacking General Physics and Astronomy 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cathode 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering law Electrode Ionic liquid engineering Energy density General Materials Science Pyrite 0210 nano-technology Electrical conductor |
| Zdroj: | ACS Nano. 12:12444-12455 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.8b06660 |
| Popis: | Metal-polysulfide batteries are attracting broad attention as conversion reaction systems of high theoretical energy density and low cost. However, their further applications are hindered by the low loading of active species, excess conductive additive, and loose (nanostructured) electrode networkss. Herein, we propose that compact grain stacking and surface fluorination are two crucial factors for achieving high-rate and long-life pyrite (FeS2) cathodes enabled by sulfurating ionic liquid wrapped open-framework fluorides. Both of the factors can accelerate the Li- and Na-driven transport across the pyrite–electrolyte interface and conversion propagation between adjacent grains. Such an electrode design enables a highly reversible capacity of 425 mAh/g after 1000 cycles at 1 C for Li storage and 450 mAh/g after 1200 cycles at 2 C for Na storage, even under a high loading of pyrite grains and ultrathin carbon coating ( |
| Databáze: | OpenAIRE |
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