Prevention of sulfur diffusion using MoS sub(2)-intercalated 3D-nanostructured graphite for high-performance lithium-ion batteries

We report new three-dimensional (3D)-nanostructured MoS sub(2)-carbonaceous materials in which MoS sub(2) sheets are intercalated between the graphite layers that possess a multiply repeated graphite/MoS sub(2)/graphite structure which prevents the aggregation of MoS sub(2) and diffusion of sulfur f...

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Bibliographic Details
Published in:Nanoscale 2015-07, Vol.7 (28), p.11928-11933
Main Authors: Tiwari, Anand P, Yoo, HeeJoun, Lee, JeongTaik, Kim, Doyoung, Park, Jong Hyeok, Lee, Hyoyoung
Format: Article
Language:English
Subjects:
Cycles
Diffusion
Graphite
Lithium-ion batteries
Molybdenum disulfide
Stability
Sulfur
Three dimensional
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Summary:We report new three-dimensional (3D)-nanostructured MoS sub(2)-carbonaceous materials in which MoS sub(2) sheets are intercalated between the graphite layers that possess a multiply repeated graphite/MoS sub(2)/graphite structure which prevents the aggregation of MoS sub(2) and diffusion of sulfur from carbonaceous materials, enhancing the cycling stability of Li-ion batteries. We developed an efficient and scalable process applicable to mass production for synthesizing non-aggregated MoS sub(2)-intercalated 3D hybrid-nanostructured graphite based on stress induced and microwave irradiation. X-ray diffraction, X-ray photospectroscopy, Raman spectroscopy, field emission scanning electron microscopy, and high-resolution transmission electron microscopy analyses demonstrated that the as-synthesized materials consisted of MoS sub(2)-intercalated 3D hybrid-nanostructured graphite platelets that had a multiply repeated graphite/MoS sub(2)/graphite structure. The obtained MoS sub(2)-graphite powder surpasses MoS sub(2) as an anode material in terms of specific capacity, cyclic stability, and rate performances at high current densities for Li-ion batteries. The electrochemical impedance spectroscopy demonstrated that the graphite sheets not only reduced the contact resistance in the electrode but also facilitated electron transfer in the lithiation/delithiation processes. The superior electrochemical performances especially for the cycling stability of the Li-ion battery originate from prevention of the sulfur diffusion of the MoS sub(2)-intercalated 3D-nanostructured graphite.
ISSN:2040-3364
2040-3372
DOI:10.1039/c5nr03111g