Engineering yolk–shell P-doped NiS2/C spheres via a MOF-template for high-performance sodium-ion batteries
| Autor: | Zhanli Han, Chuanbao Cao, Quanqing Zhao, Shide Wu, Xiuyun Yao, Xilan Ma, Liqin Wang, Youqi Zhu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science Sulfide Renewable Energy Sustainability and the Environment Sodium Doping Heteroatom chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Transition metal chemistry Chemical engineering General Materials Science SPHERES 0210 nano-technology Faraday efficiency |
| Zdroj: | Journal of Materials Chemistry A. 8:8612-8619 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta02568b |
| Popis: | Transition metal sulfides generally demonstrate unsatisfactory capacity and a limited rate capability that still restrict their application for sodium-ion batteries. Herein, yolk–shell P-doped NiS2/C spheres were synthesized via a Ni-MOF template with phytic acid acting as a P source to significantly enhance the sulfide's sodium storage property. The yolk–shell P-doped NiS2/C spheres exhibited an ultrahigh initial discharge and charge capacities of 3546.7 and 2622.9 mA h g−1 with 72.9% coulombic efficiency, and maintained a relatively high reversible capacity of 1113.5 mA h g−1 at 0.1 A g−1 after 20 cycles. Electrochemical measurements further revealed that the yolk–shell P-doped NiS2/C spheres could also deliver a good rate capability and stable long-term cycling performance with 766.8 mA h g−1 reversible capacity at 0.5 A g−1 after 400 cycles. The satisfactory electrochemical results could be ascribed to the confinement and synergistic effect from the robust yolk–shell framework and heteroatom P doping. Therefore, it was demonstrated that morphology tuning and heteroatom P doping can serve as effective strategies to significantly improve the electrochemical properties of transition metal sulfides for sodium-ion batteries. |
| Databáze: | OpenAIRE |
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