In situ electron microscopic observation of electrochemical Li-intercalation into MoS2

• Published in: Solid state ionics Vol. 357; p. 115488
• Main Authors: Yoshida, Kaname, Kawasaki, Tadahiro, Kuwabara, Akihide, Ukyo, Yoshio, Ikuhara, Yuichi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2020; Elsevier BV
• Subjects: Batteries; Electrochemical reaction; Electron energy loss spectroscopy; Electrons; Energy dissipation; in situ observation; Intercalation; Li-intercalation; Lithium; Lithium oxides; Molybdenum; Molybdenum disulfide; MoS2; Transmission electron microscopy; Li-intercalation; Electrochemical reaction; MoS2; in situ observation; Electron energy loss spectroscopy
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2020.115488

In this work, lithium (Li) intercalation into molybdenum disulfide (MoS2) is observed by in situ transmission electron microscope (TEM). A solid-state electrochemical reaction is carried out in a vacuum of TEM column using an electrochemical probe holder. The Li-intercalation proceeds radially from a connecting point between Li2O and MoS2. The 2H-1 T structural transition of the MoS2 layer accompanied by the lithiation is identified by electron diffractions. The electron energy loss spectra (EELS) of the lithiated and non-lithiated areas indicated that the electronic properties of the MoS2 layer changed after the lithiation. [Display omitted] •The solid-state electrochemical reaction of Li-intercalation into MoS2 is performed.•The Li-intercalation process is observed directly by the TEM.•The lithiation process proceeds rapidly near the edge of MoS2.