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Auto-Generated Iron Chalcogenide Microcapsules Ensured High-Rate and High-Capacity Sodium-Ion Storage

Abstract

Sodium-ion batteries (SIBs) are regarded as promising alternative energy-storage devices to lithium-ion batteries (LIBs). Yet the trade-off of energy density and power density under high mass-loaded condition also restricts the application of SIBs. Herein, we synthesized a FeS0.75Se0.25 material by the facile designed one-step solid-state reaction. A microcapsule architecture was spontaneously achieved in this process, which could facilitate the electron transport and provide stable diffusion paths for the Na ions. The FeS0.75Se0.25 material revealed high capacity retention (485 mAh g-1 at 3 A g-1 after 1400 cycles) and superior rate capability (230 mAh g-1 at 10 A g-1 after 1600 cycles) for the half-cell test. And superior cycling stability was also achieved in the full-cell test. The high mass-loaded FeS0.75Se0.25 electrodes (8 mg cm-2) realized high areal capacity retention of 2.8 mAh cm-2 and high thermal stability.

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Publication details

The article was received on 06 Nov 2017, accepted on 06 Dec 2017 and first published on 06 Dec 2017


Article type: Paper
DOI: 10.1039/C7NR08255J
Citation: Nanoscale, 2017, Accepted Manuscript
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    Auto-Generated Iron Chalcogenide Microcapsules Ensured High-Rate and High-Capacity Sodium-Ion Storage

    X. Wang, Z. Yang, C. Wang, L. Ma, C. Zhao, J. Chen, X. ZHANG and M. Xue, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR08255J

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