Issue 23, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2018
Accepted
14 May 2018
First published
15 May 2018

Nanoscale, 2018,10, 11165-11175

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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