Lithium and sodium solid-state electrolyte materials

Patent metadata

Field	Value
Publication number	US-2018351207-A1
Application number	US-201815966234-A
Country	US
Kind code	A1
Filing date	Apr 30, 2018
Priority date	Jun 1, 2017
Publication date	Dec 6, 2018
Grant date	—

Abstract

A solid electrolyte material is of the formula A 7±2x P 3 X ((11±x)−y) O y 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.

First claim

What is claimed is:

1 . A solid electrolyte material of the formula
A 7±2x P 3 X ((11±x)−y) O y 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.

2 . The solid electrolyte of claim 1 , wherein y is 0 and the solid electrolyte material is of the formula
A 7±2x P 3 X 11±x 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.

3 . The solid electrolyte of claim 1 , wherein the solid electrolyte material has an ionic conductivity of greater than or equal to 5 mS/cm at 23° C.

4 . The solid electrolyte of claim 1 , wherein A is Li, X is Se, and x is 0.

5 . The solid electrolyte of claim 4 , wherein the solid electrolyte material has an ionic conductivity of 5 to 55 mS/cm at 23° C.

6 . The solid electrolyte of claim 4 , wherein the solid electrolyte material has a body centered cubic crystal structure having an a-axis length lattice constant of 12.8 to 14.3 angstroms, a b-axis length lattice constant of 6.1 to 6.9 angstroms, and a c-axis lattice constant of 12.7 to 14.1 angstroms, when analyzed by X-ray powder diffraction using Cu Kα radiation.

7 . The solid electrolyte of claim 4 , having a first peak at a diffraction angle of 21 to 24 degrees 2θ, and a second peak at a diffraction angle of 26 to 29 degrees 2θ, when analyzed by X-ray powder diffraction using Cu Kα radiation.

8 . The solid electrolyte of claim 1 , wherein A is Na, X is S, Se, or a combination thereof, and x is 0.

9 . The solid electrolyte of claim 8 , wherein A is Na, X is S, and x is 0.

10 . The solid electrolyte of claim 9 , wherein the solid electrolyte material has an ionic conductivity of 5 to 15 mS/cm at 23° C.

11 . The solid electrolyte of claim 9 , wherein the solid electrolyte material has a body centered cubic crystal structure having an a-axis length lattice constant of 13.3 to 14.8 angstroms, a b-axis length lattice constant of 6.1 to 6.9 angstroms, and a c-axis lattice constant of 12.8 to 14.3 angstroms, when analyzed by X-ray powder diffraction using Cu Kα radiation.

12 . The solid electrolyte of claim 9 , having a first peak at a diffraction angle of 15 to 18 degrees 2θ, and a second peak at a diffraction angle of 26 to 29 degrees 2θ, when analyzed by X-ray powder diffraction using Cu Kα radiation.

13 . The solid electrolyte of claim 8 , wherein A is Na, X is Se, and x is 0.

14 . The solid electrolyte of claim 13 , wherein the solid electrolyte material has an ionic conductivity of 5 to 15 mS/cm at 23° C.

15 . The solid electrolyte of claim 13 , wherein the solid electrolyte material has a body centered cubic crystal structure having an a-axis length lattice constant of 14.3 to 15.9 angstroms, a b-axis length lattice constant of 6.5 to 7.2 angstroms, and a c-axis lattice constant of 13.2 to 14.7 angstroms, when analyzed by X-ray powder diffraction using Cu Kα radiation.

16 . The solid electrolyte of claim 13 , having a first peak at a diffraction angle of 14 to 17 degrees 2θ and a second peak at a diffraction angle of 26 to 29 degrees 2θ, when analyzed by X-ray powder diffraction using Cu Kα radiation.

17 . The solid electrolyte of claim 1 , wherein an anion sublattice of the solid electrolyte material has a body centered cubic crystal structure.

18 . An electrochemical cell comprising
a positive electrode, a negative electrode, and a solid electrolyte material of the formula
A 7±2x P 3 X ((11±x)−y) O y
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,
wherein the solid electrolyte material is disposed between the positive electrode and the negative electrode.

19 . The electrochemical cell of claim 18 , further comprising a separator disposed between the positive electrode and the negative electrode.

20 . The electrochemical cell of claim 18 , wherein the solid electrolyte material is of the formula Li 7 P 3 Se 11 .

21 . The electrochemical cell of claim 18 , wherein the solid electrolyte material is of the formula Na 7 P 3 X 11 , wherein X is S or Se.

22 . 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
A 7±2x P 3 X ((11±x)−y) O y
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.

23 . 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
A 7±2x P 3 X ((11±x)−y) O y
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, between the positive electrode and the negative electrode to manufacture the electrochemical cell.

Assignees

• Samsung Electronics Co Ltd
• Univ California
• Massachusetts Inst Technology

Inventors

• Wang Yan
• Miara Lincoln
• Ceder Gerbrand
• Richards William D

Classifications

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title