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1. A method of making silicon sulfide, comprising mixing silicon powder particles and sulfur powder particles in an inert atmosphere in a manner that coats the silicon powder particles with sulfur and prevents oxidation of the silicon powder particles wherein the sulfur powder particles provide an amount of sulfur that is present in an excess of stoichiometry of the silicon sulfide to be made, heating the sulfur-coated silicon particles disposed in a container to a final temperature for a time with motion of the container to react the silicon and the sulfur to form silicon sulfide reaction product, and removing excess sulfur from the silicon sulfide reaction product to produce the silicon sulfide with a purity of 4N (99.99% by weight on a trace metals basis) or better, wherein the mixing produces a powder mass consisting of the sulfur-coated silicon particles and excess sulfur.
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