Research ArticleMATERIALS SCIENCE

Anomalous interfacial stress generation during sodium intercalation/extraction in MoS2 thin-film anodes

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Science Advances  02 Jan 2019:
Vol. 5, no. 1, eaav2820
DOI: 10.1126/sciadv.aav2820
  • Fig. 1 Electrochemistry performance of MoS2 evaluated in traditional coin cell battery setup.

    Galvanostatic charge/discharge curves of two identical MoS2 half-cell (versus Na) coin-cell batteries at 0.05 Ag−1 are shown. The first battery was directly discharged to 0.01 V (A); the second battery was consequently discharged to 1.0 V (fig. S2), 0.85 V (B), 0.4 V (C), and 0.01 V (D) for three cycles each.

  • Fig. 2 Experimental setup and materials characterization.

    The schematic in (A) illustrates the microcantilever system for the detection of the sodiation/desodiation-induced stress in the few-layer MoS2. The photograph (B) of the homemade electrochemistry cell shows the counter electrode made up of Na connected to a Pt wire (photo credit: Keren Jiang, University of Alberta). Morphological and chemical characterization of the electrodes was carried out by HiM (C and D), AFM (E and F), TEM (G), Raman spectroscopy (H), and XRD spectroscopy (I). a.u., arbitrary units.

  • Fig. 3 Charge/discharge curves at ~0.1 Ag−1 (blue lines) and the synchronized stress response (black lines) of cantilever electrochemistry cells.

    The signals of the MoS2-coated cantilever are shown in solid lines, and blank cantilever are shown in dotted lines. The cells are consequently discharged to 1.0 V (group I), 0.85 V (group II), 0.4 V (group III), and 0.01 V (group IV) for three cycles each. The information in whole test range is shown in (A), while the details in each group are shown in (B) to (E).

  • Fig. 4 A comprehensive summary of stress and structural evolution in the sodiation of few-layer MoS2 film.

    The size of hexagon at upper right corner stands for the lattice size in the basal plane.

Supplementary Materials

  • Supplementary material for this article is available at http://advances.sciencemag.org/cgi/content/full/5/1/eaav2820/DC1

    Fig. S1. Scanning electron microscopy image of the eight-microcantilever array used in this work.

    Fig. S2. Galvanostatic charge/discharge curves of MoS2 half-cell (versus Na) batteries at 0.05 A with a cutoff discharging potential of 1.0 V.

    Fig. S3. TEM cross-sectional image of continuous MoS2 thin film in a long range.

    Fig. S4. Linear displacement-stress relationship for a cantilever in response to a surface force in the direction perpendicular to the undisturbed surface.

  • Supplementary Materials

    This PDF file includes:

    • Fig. S1. Scanning electron microscopy image of the eight-microcantilever array used in this work.
    • Fig. S2. Galvanostatic charge/discharge curves of MoS2 half-cell (versus Na) batteries at 0.05 A with a cutoff discharging potential of 1.0 V.
    • Fig. S3. TEM cross-sectional image of continuous MoS2 thin film in a long range.
    • Fig. S4. Linear displacement-stress relationship for a cantilever in response to a surface force in the direction perpendicular to the undisturbed surface.

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