Magnesium Sulphide As Anode Material for Lithium-Ion Batteries
MgS + 2Li ---> Li2S + Mg
In addition, lithium can react with magnesium to form alloys of lithium by further increasing the theoretical capacity. The high capacity combined with low reaction potential makes MgS an interesting anode material for Li-ion batteries in principle. Hence we synthesized MgS-carbon nanocomposites and evaluated them as anode material for lithium-ion batteries. A possible lithiation and delithiation mechanism for MgS is proposed based on electrochemical and ex-situ XRD studies. The electrochemical reaction of MgS with lithium results in the formation of Li2S and Mg, the as-formed Mg simultaneously reacts with lithium and forms LixMg alloy further contributing to the capacity. A stable reversible capacity of 530 mAh g-1 was achieved after 100 cycles within the voltage window of 0.001 - 2.5 V (Figure 1). The compatibility of MgS anode was tested in full cell using lithium nickel manganese cobalt oxide (LNMC) and lithium iron phosphate (LFP) as cathodes.