METHOD FOR PRODUCING LITHIUM COMPOSITION AND METHOD FOR PRODUCING SULFIDE SOLID ELECTROLYTE MATERIAL

摘要

A method for producing a lithium composition capable of suppressing the generation of polysulfides is provided. The method for producing a lithium composition includes a first aqueous solution forming step of forming a first aqueous solution by reacting iodine with a reducing aqueous solution containing calcium oxide, formic acid, and water under a condition of a pH of 5.5 or more and a pH of 10.21 or less through heating, a second aqueous solution forming step of forming a second aqueous solution by adding calcium oxide to the first aqueous solution, a third aqueous solution forming step of forming a third aqueous solution by adding lithium carbonate to the second aqueous solution, and a Li2S forming step of forming the lithium sulfide (Li2S) by sulfurizing lithium hydroxide (LiOH) to form lithium hydrosulfide (LiHS) and then eliminating hydrogen sulfide from lithium hydrosulfide (LiHS).

主权项

1. A method for producing a lithium composition, the lithium composition comprising at least lithium sulfide (Li2S) and lithium iodide (LiI); the method comprising:
forming a first aqueous solution containing calcium iodide (CaI2) by reacting iodine with a reducing aqueous solution containing calcium oxide, formic acid, and water under a condition of a pH of 5.5 or more and a pH of 10.21 or less through heating; forming a second aqueous solution containing calcium hydroxide (Ca(OH)2) and the calcium iodide (CaI2) by adding calcium oxide to the first aqueous solution; forming a third aqueous solution containing lithium hydroxide (LiOH) and lithium iodide (LiI) by adding lithium carbonate to the second aqueous solution; and forming Li2S by sulfurizing the lithium hydroxide (LiOH) to form lithium hydrosulfide (LiHS) and then eliminating hydrogen sulfide from the lithium hydrosulfide (LiHS).