Publication Date:
2018
abstract:
Recently many observations related to the catalytic effects of layered metal disulfide versus polysulfide electrochemistry were documented. In this work, we investigated the reactivity of layered WS2 in a Li-S battery and observed a chemical reaction involving the removal of W ions by polysulfides. The presence of metallic tungsten nanoparticles in the sulfur cathode is the result of W ion oxidation reaction and subsequent recrystallization during cycling. In situ Raman spectroscopy and ex situ transmission electron microscopy were used in order to clarify the reaction mechanism.
Iris type:
01.01 Articolo in rivista
Keywords:
Lithium sulfur batteries; In-situ Raman spectroscopy; Transmission electron microscopy; Polysulfides; High Capacity; Modified Separator; Tungsten; Layered materials; Sulfur compounds
List of contributors:
Bertoni, Giovanni
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