MoS2 as a long-life host material for potassium ion intercalation

Electrochemical potassium ion intercalation into two-dimensional layered MoS2 was studied for the first time for potential applications in the anode in potassium-based batteries. X-ray diffraction analysis indicated that an intercalated potassium compound, hexagonal K0.4MoS2, formed during the inter...

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Bibliographic Details
Published in:Nano research 2017-04, Vol.10 (4), p.1313-1321
Main Authors: Ren, Xiaodi, Zhao, Qiang, McCulloch, William D., Wu, Yiying
Format: Article
Language:English
Subjects:
Anodes
Atomic/Molecular Structure and Spectra
Batteries
Biomedicine
Biotechnology
Chemistry and Materials Science
Condensed Matter Physics
Diffusion coefficient
Diffusion rate
Electrochemistry
Electrode materials
Intercalation
Materials Science
Molybdenum disulfide
Nanotechnology
Potassium
Research Article
X-ray diffraction
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Summary:Electrochemical potassium ion intercalation into two-dimensional layered MoS2 was studied for the first time for potential applications in the anode in potassium-based batteries. X-ray diffraction analysis indicated that an intercalated potassium compound, hexagonal K0.4MoS2, formed during the intercalation process. Despite the size of K^＋, MoS2 was a long-life host for repetitive potassium ion intercalation and de-intercalation with a capacity retention of 97.5% after 200 cycles. The diffusion coefficient of the K^＋ ions in KxMoS2 was calculated based on the Randles-Sevcik equation. A higher K^＋ intercalation ratio not only encountered a much slower K^＋ diffusion rate in MoS2, but also induced MoS2 reduction. This study shows that metal dichalcogenides are promising potassium anode materials for emerging K-ion, K-O2, and K-S batteries.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-016-1419-9