Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 29, Pages 14324-14329Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta05612a
Keywords
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Funding
- National Key RAMP
- D Program of China [2016YFB0100100, 2016YFA0200200]
- National Natural Science Foundation of China [51572259]
- Natural Science Foundation of Liaoning Province [201602737]
- Recruitment Program of Global Expert (1000 Talent Plan)
- DICP [DICP ZZBS201708]
- Exploratory Research Program of Shaanxi Yanchang Petroleum (Group) CO., LTD DICP
- China Postdoctoral Science Foundation [2016M601349, 2017T100188]
- DICP Outstanding Postdoctoral Foundation [2016YB06]
- DICP
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Sodium ion batteries (SIBs) for large-scale grid applications are facing great challenges in terms of development of high-performance electrode materials and screening of suitable electrolytes. Herein, a versatile and scalable protocol for synthesizing two-dimensional (2D) holey cobalt sulfide (h-Co4S3) nanosheets is demonstrated for high-rate and long-life SIBs in an ether-based electrolyte of 1.0 M NaCF3SO3 in diglyme. The 2D h-Co4S3 nanosheets are prepared by sulfuration of leaf-like cobalt based metal-organic frameworks (CoMOFs), and subsequent annealing treatment. Benefiting from the nanosheet nature of in-plane nanopores (10-30 nm), ultra-thinness (< 30 nm), crumpled morphology, and micron-scale lateral size that can provide more active sites and enhanced sodiation/desodiation kinetics, the resulting h-Co4S3 nanosheets achieve a high reversible capacity of 571 mA h g(-1) at 0.1 A g(-1), and long-life cycling stability with a retention of 80% after 400 cycles for SIBs. Furthermore, theoretical simulation reveals the enhanced structural stability of h-Co4S3 nanosheets with a lower binding energy (0.31 eV) of the Co-O bond in the ether-based electrolyte than that in the carbonate-based electrolyte. Notably, the h-Co4S3 anode offers an exceptional rate capacity of 257 mA h g(-1) at 12 A g(-1), outperforming most reported cobalt sulfide-based anodes. This strategy will pave a new way to rationally construct MOF-derived 2D nanostructures for various energy-related applications.
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