Modification of Lithium Sulfide Prepared with Lithium Metal by Lithium Nitride
Lithium sulfide was prepared by solid phase syntheses,with lithium metal as the lithium source,sulfur powder as the sulfur source,and lithium nitride as the additive.Thermodynamic analysis results show that lithium nitride can promote the reaction of lithium metal with sulfur powder to synthesize lithium sulfide;Li3N firstly reacts with sulfur powder to release N2,leading to holes formed on the molten lithium metal sheet and the contact area between lithium metal and sulfur powder further expanded.Thus a loose and porous skeleton structure is formed,which is conducive to subsequent crushing and can reduce the risk of secondary reactions in the following ball milling process.With Li∶S∶Li3N=2∶2∶0.4(molar ratio),crude lithium sulfide can be obtained after 8 hours reaction at 100 ℃.It is then subjected to calcination,impurity removal and ball milling processes,and a kind of lithium sulfide products with purity greater than 99.95％and particle size less than 15 μm can be obtained,which can be used in EV.This method provides a new idea for industrial production of lithium sulfide products.
solid-state batterysolid electrolytelithium nitridelithiumsulphurmaterial for EV
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