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Issue 23, 2018
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Sodium storage in a promising MoS2–carbon anode: elucidating structural and interfacial transitions in the intercalation process and conversion reactions

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Abstract

Sodium-ion batteries and capacitors are considered as low-cost energy storage devices, compared to Li-ion counterparts. However, most anodes for sodium-ion devices show sluggish kinetics and poor structural stability caused by the large radius (1.02 Å) of Na+. One candidate anode is MoS2, a 2D atomic layered material with a large interlayer spacing of 6.2 Å, that can take up and release Na+via two working principles: a two-electron intercalation process and a four-electron conversion reaction. Herein, we report a facile method to synthesize a MoS2–amorphous carbon (MoS2–AC) nanocomposite and further study the effect of the two working principles on the structure, interphase, and charge storage properties of MoS2–AC. The two-electron intercalation reaction enables the MoS2–AC electrode to have a higher rate capability and superior stability than that via the four-electron Na+ conversion reaction. This favorable Na+ charge storage performance of MoS2–AC via the two-electron intercalation process is attributed to its pseudocapacitive behavior, a stable solid electrolyte interphase and robust stability of the structure, which enables us to fabricate a sodium-ion capacitor that can deliver high energy density at a high rate. This work underscores the potential importance of realizing fast Na+ charge storage via an intercalation process as a strategy for the fabrication of high-performance sodium-ion capacitors and batteries.

Graphical abstract: Sodium storage in a promising MoS2–carbon anode: elucidating structural and interfacial transitions in the intercalation process and conversion reactions

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Supplementary files

Article information


Submitted
31 Mar 2018
Accepted
14 May 2018
First published
15 May 2018

Nanoscale, 2018,10, 11165-11175
Article type
Paper

Sodium storage in a promising MoS2–carbon anode: elucidating structural and interfacial transitions in the intercalation process and conversion reactions

R. Wang, S. Wang, Y. Zhang, D. Jin, X. Tao and L. Zhang, Nanoscale, 2018, 10, 11165
DOI: 10.1039/C8NR02620C

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