Molybdenum(IV) sulfide (MoS2) has generated significant interest as an electroactive material for Li ion batteries due to its high theoretical capacity, good rate capability, and minimal volume changes during cycling. An important challenge toward implementing this material is understanding the many polymorphs of MoS2 that can be (de)stabilized by electrochemical lithiation and nanosizing. To this end, bulk MoS2 and deliberately synthesized nanosheet-type MoS2 were characterized both as prepared (X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-optical emission spectroscopy (ICP-OES)) and during electrochemical cycling using in situ X-ray compatible lithium cells (in situ XRD and ex situ XAS), lending insight into the specific phase changes within the nanosheet material to rationalize the significant difference in electrochemistry between the nanosheet and bulk materials upon (de)lithiation. While lithium sulfur batteries (Li−S) hold promise as future high energy density low cost energy storage systems, barriers to implementation include low sulfur loading, limited cycle life, and the use of toxic electrolyte solvents. Significantly improved Li−S electrochemistry in an environmentally friendly electrolyte solvent is demonstrated through implementation of MoS2 nanosheet materials as cathode additives, leading to improved capacity retention upon extended cycling in lithium sulfur cells. The findings will be discussed in light of the unique attributes of the MoS2 atomic level and mesoscale structure.

Molybdenum disulfide nanosheet material:  Electrochemistry as functional material and additive for lithium and lithium sulfur based batteries

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.