460686 Nanostructured Transition Metal Nitrides As Promising Cathode Materials for Lithium Sulfur Batteries
In this research, we investigated different transitional metal nitrides such as: Tungsten nitride (WN), Molybdenum Nitride (Mo2N) and Vanadium Nitride (VN) as novel cathode materials for Li/dissolved polysulfide batteries. Transition metal nitrides are well known materials for super-capacitors and lithium-ion batteries due to their high reversible insertion and extraction of ionic species and the capability of storing lithium by the intercalation mechanism. In order to obtain a better understanding of the electrochemical performance and the mechanisms underlying polysulfides redox reactions of all cathode materials, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) analysis, in addition to electrochemical spectra (EIS) and cyclic voltammetry (CV) measurement have been applied. Among these metal nitrides, WN exhibited the most promising capacity performance as it can adsorb lithium polysulfides effectively and transfer electrons in a facile manner. As a result, the active material and surface area loss were reduced and the capacity and capacity retention of the cell were enhanced.
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