Sodium storage in a promising MoS2–carbon anode: elucidating structural and interfacial transitions in the intercalation process and conversion reactions
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AbstractSodium-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.
All Author(s) ListRutao Wang, Shijie Wang, Yabin Zhang, Dongdong Jin, Xinyong Tao, Li Zhang
Journal nameNanoscale
Year2018
Month6
Day21
Volume Number10
Issue Number23
Pages11165 - 11175
ISSN2040-3364
LanguagesEnglish-United Kingdom

Last updated on 2020-01-06 at 01:39