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Issue 2, 2018
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Auto-generated iron chalcogenide microcapsules ensure high-rate and high-capacity sodium-ion storage

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Abstract

Sodium-ion batteries (SIBs) are regarded as promising alternative energy-storage devices to lithium-ion batteries (LIBs). However, the trade-off of between energy density and power density under high mass-loading conditions restricts the application of SIBs. Herein, we synthesized an FeSe@FeS material via a facile solid-state reaction. A microcapsule architecture was spontaneously achieved in this process, which facilitated electron transport and provided stable diffusion paths for Na ions. The FeSe@FeS material exhibits a high capacity retention (485 mA h g−1 at 3 A g−1 after 1400 cycles) and superior rate capability (230 mA h g−1 at 10 A g−1 after 1600 cycles) in the half-cell test. Furthermore, superior cycling stability is achieved in the full-cell test. The high mass-loaded FeSe@FeS electrodes (8 mg cm−2) realize a high areal capacity retention of 2.8 mA h cm−2 and high thermal stability.

Graphical abstract: Auto-generated iron chalcogenide microcapsules ensure high-rate and high-capacity sodium-ion storage

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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, 2018,10, 800-806
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    Auto-generated iron chalcogenide microcapsules ensure 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, 2018, 10, 800
    DOI: 10.1039/C7NR08255J

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