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US 2026/0176145 A1Published application
Low temperature purification of metal sulfides
AssigneeSolid Power Operating, Inc.
InventorsBenjamin A. CARLSON, Samuel M. OBERWETTER, Clara MAUSER, Brian E. FRANCISCO
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Abstract
Methods for purifying metal sulfides include combining an alkali metal sulfide and composites that include a metal sulfide in an aprotic solvent, filtering undissolved solids from the mixture, and adding a secondary sulfide to the solution to precipitate the highly pure metal sulfide. The purified metal sulfides may be used in the production of solid-state electrochemical cells.
Claims20
A method for purifying a metal sulfide comprising:
- combining an alkali metal sulfide, a composite comprising the metal sulfide, and an aprotic solvent to produce a mixture of undissolved materials and a solution comprising the metal sulfide and the alkali metal sulfide, wherein the metal sulfide and the alkali metal sulfide are dissolved in the solution;
- removing the undissolved materials;
- adding a secondary sulfide to the solution comprising the metal sulfide and the alkali metal sulfide, thereby precipitating the metal sulfide;
- and
- collecting the metal sulfide.
2 more elements
A method for purifying a metal sulfide comprising:
- combining a first alkali metal sulfide, a first alkali metal salt, and a solvent forming a mixture of a second alkali metal salt and a second alkali metal sulfide;
- adding a composite comprising a metal sulfide to produce a mixture of undissolved materials and a solution comprising a metal sulfide and a second alkali metal sulfide;
- removing the undissolved materials;
- adding a secondary sulfide to the solution, thereby precipitating the metal sulfide;
- and
- collecting the metal sulfide.
3 more elements
A method for purifying a metal sulfide comprising:
- combining Na2S, LiCl, and a nitrile solvent to form a mixture of NaCl and a second alkali metal sulfide;
- adding a composite comprising a metal sulfide to produce a mixture of undissolved materials and a solution comprising the metal sulfide and the second alkali metal sulfide;
- removing the undissolved materials;
- adding P2S5 to the solution, thereby precipitating the metal sulfide;
- and
- collecting the metal sulfide.
3 more elements
Dependencies are inferred from the claim text.