Observation of an intermediate state during lithium intercalation of twisted bilayer MoS2

Lithium intercalation of MoS 2 is generally believed to introduce a phase transition from H phase (semiconducting) to T phase (metallic). However, during the intercalation process, a spatially sharp boundary is usually formed between the fully intercalated T phase MoS 2 and non-intercalated H phase...

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Veröffentlicht in:Nature communications 2022-05, Vol.13 (1), p.3008-3008, Article 3008
Hauptverfasser: Wu, Yecun, Wang, Jingyang, Li, Yanbin, Zhou, Jiawei, Wang, Bai Yang, Yang, Ankun, Wang, Lin-Wang, Hwang, Harold Y., Cui, Yi
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Sprache:eng
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Zusammenfassung:Lithium intercalation of MoS 2 is generally believed to introduce a phase transition from H phase (semiconducting) to T phase (metallic). However, during the intercalation process, a spatially sharp boundary is usually formed between the fully intercalated T phase MoS 2 and non-intercalated H phase MoS 2 . The intermediate state, i.e ., lightly intercalated H phase MoS 2 without a phase transition, is difficult to investigate by optical-microscope-based spectroscopy due to the narrow size. Here, we report the stabilization of the intermediate state across the whole flake of twisted bilayer MoS 2 . The twisted bilayer system allows the lithium to intercalate from the top surface and enables fast Li-ion diffusion by the reduced interlayer interaction. The E 2g Raman mode of the intermediate state shows a peak splitting behavior. Our simulation results indicate that the intermediate state is stabilized by lithium-induced symmetry breaking of the H phase MoS 2 . Our results provide an insight into the non-uniform intercalation during battery charging and discharging, and also open a new opportunity to modulate the properties of twisted 2D systems with guest species doping in the Moiré structures. Li intercalation of MoS 2 induces a transition from the insulating H-phase to the metallic T-phase, with a sharp boundary in between. Here the authors stabilize the intermediate phase in twisted bilayer MoS 2 , by leveraging the Moiré potential which facilitates fast Li diffusion and uniform intercalation.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-30516-z