Method for purifying lithium sulfide
AssigneeIdemitsu Kosan Co., Ltd.
InventorsYoshikatsu Seino, Minoru Senga
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Abstract
A method of purifying lithium sulfide wherein lithium sulfide obtained by reacting lithium hydroxide with hydrogen sulfide in an aprotic organic solvent is washed with an organic solvent at a temperature of 100° C. or higher. Impurities contained in lithium sulfide can be reduced by the method of purification.
Claims14
A method of purifying lithium sulfide, comprising reacting lithium hydroxide with hydrogen sulfide in an aprotic organic solvent to produce lithium sulfide, and washing the lithium sulfide with an organic solvent at a temperature of 100° C. or higher wherein the organic solvent used for washing is N-methyl-2-pyrrolidone (NMP) and wherein lithium N-methylaminobutyrate (LMAB) in the washed lithium sulfide is present at a range of 0.1% by weight or less.
Dependencies are inferred from the claim text.