▎ 摘　　要

NOVELTY - Producing lithium sulfide, comprises (i) performing first heat treatment by heat-treating mixture of lithium sulfate and reducing agent powder; and (ii) performing second heat treatment by heating lithium sulfide obtained by reducing lithium sulfate in first heat treatment to obtain sublimated lithium sulfide. USE - The lithium sulfide is useful in next-generation battery field. ADVANTAGE - The method reduces impurities and is suitable for mass production. The lithium sulfide: provides dual safety, high energy density, high output, and temperature stability based on a bipolar structure; improves conductivity and cell performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for lithium sulfide prepared by the above method.