Lithium and sodium solid-state electrolyte materials
AssigneesSamsung Electronics Co., Ltd., The Regents of the University of California, Massachusetts Institute of Technology
InventorsYan Wang, Lincoln Miara, Gerbrand Ceder, William D. Richards
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Abstract
A solid electrolyte material is of the formula A7±2xP3X((11±x)−y)Oy wherein wherein A is Li or Na, wherein X is S, Se, or a combination thereof, provided that when M is Li, X is Se, and wherein 0≤x≤0.25 and 0≤y≤2.5. Also, an electrochemical cell including the solid electrolyte material, and methods for the manufacture of the solid electrolyte material and the electrochemical cell.
Claims17
A solid electrolyte material of the formula A7±2xP3X((11±x)−y)Oy
- wherein A is Li or Na,
- wherein X is S, Se, or a combination thereof, provided that when is Li, X is Se,
- wherein 0<x<0.25 and 0<y<2.5,
- wherein an anion sublattice of the solid electrolyte material has a body centered cubic crystal structure,
- wherein the solid electrolyte material has a triclinic structure, and
- wherein the solid electrolyte material has an ionic conductivity of greater than or equal to 5 mS/cm at 23° C.
An electrochemical cell comprising
- a positive electrode,
- a negative electrode,
- and a solid electrolyte material of the formula A7±2xP3X((11±x)−y)Oy
- wherein A is Li or Na,
- wherein X is S, Se, or a combination thereof, provided that when is Li, X is Se,
- wherein 0<x<0.25 and 0<y<2.5,
- wherein an anion sublattice of the solid electrolyte material has a body centered cubic crystal structure,
- wherein the solid electrolyte material has a triclinic structure, and
- wherein the solid electrolyte material has an ionic conductivity of greater than or equal to 5 mS/cm at 23° C.,
- wherein the solid electrolyte material is disposed between the positive electrode and the negative electrode.
A method for the manufacture of a material for a solid electrolyte, the method comprising:
- combining a sodium source or a lithium source and a precursor material comprising P and Se or S, provided that when a lithium source is used, the precursor material comprises P and Se, to form a mixture, and
- heat-treating the mixture to manufacture the material for a solid electrolyte,
- wherein the material is of the formula A7±2xP3X((11±x)−y)Oy
- wherein A is Li or Na,
- wherein X is S, Se, or a combination thereof, provided that when is Li, X is Se,
- wherein 0<x<0.25 and 0<y<2.5,
- wherein an anion sublattice of the material has a body centered cubic crystal structure,
- wherein the solid electrolyte material has a triclinic structure, and
- wherein the material has an ionic conductivity of greater than or equal to 5 mS/cm at 23° C.
A method for the manufacture of an electrochemical cell, the method comprising:
- providing a positive electrode,
- providing a negative electrode, and
- disposing a solid electrolyte material of the formula A7±2xP3X((11±x)−y)Oy
- wherein A is Li or Na, wherein X is S, Se, or a combination thereof, provided that when is Li, X is Se,
- wherein 0<x<0.25 and 0<y<2.5,
- wherein an anion sublattice of the solid electrolyte material has a body centered cubic crystal structure,
- wherein the solid electrolyte material has a triclinic structure, and
- wherein the solid electrolyte material has an ionic conductivity of greater than or equal to 5 mS/cm at 23° C.,
- between the positive electrode and the negative electrode to manufacture the electrochemical cell.
A solid electrolyte material of the formula
- A7±2xP3X((11±x)−y)Oy
- wherein A is Li or Na,
- wherein X is S, Se, or a combination thereof, provided that when A is Li, X is Se,
- wherein 0≤x≤0.25 and 0≤y≤2.5,
- wherein the solid electrolyte material has a triclinic structure, and
- wherein the solid electrolyte material has an ionic conductivity of greater than or equal to 5 mS/cm at 23° C.
Dependencies are inferred from the claim text.