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magnesium sulfide (MgS) is formed by the reaction of Magnesium, a metal, with Sulfur, a non-metal. Its structural formula is MgS and IUPAC name is sulfanylidenemagnesium.
It is used in a wide range of scientific research including as an absorbent in chromatography, reagents in analytical chemistry and as catalysts in the production of polymers and other organic materials. It is also a corrosion inhibitor in oil and gas pipelines and can be used as a flame retardant in plastics.
MgS is a potential conversion/alloy-type electrode material for lithium ion batteries (LIBs). It has relatively low potential, high theoretical capacity and abundant magnesium resource, but the limited capacity utilization and inferior rate performance limit its practical application.
Sulfur and dissolved polysulfide species in the electrolyte lead to substantial capacity fading on cycling, which is primarily attributed to insufficient electronic contact of the sulfur and dissolved polysulfide species with the Li anode90,99,100. The reductive decomposition of these sulfide and polysulfide species in the electrolyte also leads to loss of active materials at the anode, which is mainly based on an SEI91.
However, if the anode is protected by the SEI91, this capacity fading will be minimal. This is in contrast to the case of an unprotected Mg anode where a layer of MgS forms on the metal anode, leading to a significant capacity fading.