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Sodium Storage in Promising MoS2-Carbon Anode: Elucidating Structural and Interfacial Transition in 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 the 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 the large interlayer spacing of 6.2 Å that can uptake and release Na+ via two working principles: two-electron intercalation process and four-electron conversion reaction. Herein, we report a facile method to synthesize MoS2-amorphous carbon (MoS2-AC) nanocomposite and further study the effect of two working principles on the structure, interphase, and charge storage properties of MoS2-AC. Two-electron intercalation reaction enables MoS2-AC electrode to have higher rate capability and superior stability than that via four-electron Na+ conversion reaction. This favorable Na+ charge storage performance of MoS2-AC via a two-electron intercalation process is attributed to its pseudocapacitive behavior, stable solid electrolyte interphase and robust stability of structure, which enables us to fabricate a sodium-ion capacitor that can deliver the high energy density at high rate. This work underscores the potential importance of realizing fast Na+ charge storage via the intercalation process as the strategy for fabricating high-performance sodium-ion capacitors and batteries.

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Publication details

The article was received on 31 Mar 2018, accepted on 14 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8NR02620C
Citation: Nanoscale, 2018, Accepted Manuscript
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    Sodium Storage in Promising MoS2-Carbon Anode: Elucidating Structural and Interfacial Transition in Intercalation Process and Conversion Reactions

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

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