Solid-state sodium ion conductor and method of making the same

Patent metadata

Field	Value
Publication number	US-12315928-B2
Application number	US-202217592570-A
Country	US
Kind code	B2
Filing date	Feb 4, 2022
Priority date	Sep 27, 2021
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

A solid-state ion conductor includes a compound of the formula Na x M 1 2−(y+z) M 2 y M 3 z (AO 4 ) 3 wherein M 1 , M 2 , and M 3 are each independently Hf, Mg, Sc, In, Y, Ca, or Zr; A is P, Si, S, or a combination thereof; 3≤x≤3.5; 0.5≤y≤1; and 0≤z≤0.5. The solid-state ion conductor can be useful in various components of an electrochemical cell.

First claim

What is claimed is:

1. A solid-state ion conductor comprising a compound of Formula 1:
Na x M 1 2−(y+z) M 2 y M 3 z (AO 4 ) 3   Formula 1

wherein
M 1 is Hf or In;
M 2 is Zr, Sc, Mg or Ca;
and when present, M 3 is Y or Sc;
A is P, Si, S, or a combination thereof;
3≤x≤3.5;
0.5≤y≤1; and
0≤z≤0.5.

2. The solid-state ion conductor of claim 1 , wherein M 1 comprises Hf, M 2 comprises Zr, and when present, M 3 comprises Sc.

3. The solid-state ion conductor of claim 1 , wherein A is Si and P.

4. The solid-state ion conductor of claim 1 , wherein M 1 comprises Hf, M 2 comprises Zr, and when present, M 3 comprises Sc, and A is Si and P.

5. The solid-state ion conductor of claim 1 , wherein x is 3.

6. The solid-state ion conductor of claim 1 , wherein 3<x≤3.5.

7. The solid-state ion conductor of claim 1 , wherein x=3, A is P, z=0, M 1 is Hf or In and M 2 is Sc or Mg.

8. The solid-state ion conductor of claim 7 comprising Na 3 HfMgP 3 O 12 or Na 3 ScInP 3 O 12 .

9. The solid-state ion conductor of claim 1 , wherein x=3, A is Si and P, z=0, M 1 is Hf or In and M 2 is Sc, Mg or Ca.

10. The solid-state ion conductor of claim 9 , comprising Na 3 Hf 1.5 Mg 0.5 (SiO 4 )(PO 4 ) 2 , Na 3 HfSc(SiO 4 )(PO 4 ) 2 , or Na 3 Hf 1.5 Ca 0.5 (SiO 4 )(PO 4 ) 2 .

11. The solid-state ion conductor of claim 1 , wherein 3<x≤3.5, A is Si and P, and 0<z≤0.5, M 1 is Hf, M 2 is Zr, and M 3 is Sc.

12. The solid-state ion conductor of claim 11 , comprising Na 3.4 Hf 0.6 ZrSc 0.4 (SiO 4 ) 2 (PO 4 ).

13. The solid-state ion conductor of claim 1 , wherein the compound of Formula 1 has a NASICON structure.

14. The solid-state ion conductor of claim 1 , wherein the compound of Formula 1 has a first main diffraction peak at 17 degrees 2θ to 22 degrees 2θ and a second main peak at a diffraction angle of 30 degrees 2θ to 33 degrees 2θ, when analyzed by X-ray powder diffraction using Cu Kα radiation.

15. The solid-state ion conductor of claim 1 , wherein the compound of Formula 1 has a sodium ion conductivity of 10 −2 to 50 mS/cm, or 10 −2 to 10 mS/cm.

16. A positive electrode comprising
a positive active material layer comprising a sodium transition metal oxide, a sodium transition metal phosphate, or a combination thereof; and
the solid-state ion conductor of claim 1 on the positive active material layer.

17. A negative electrode comprising
a negative active material layer comprising carbon, a sodium intercalation compound, sodium metal, a sodium metal alloy, or combination thereof; and
the solid-state ion conductor of claim 1 on the negative active material layer.

18. A negative electrode for a sodium secondary battery, the electrode comprising:
a current collector; and
the solid-state ion conductor of claim 1 on the current collector.

19. An electrochemical cell comprising:
a positive electrode;
a negative electrode; and
an electrolyte layer between the positive electrode and the negative electrode,
wherein at least one of the positive electrode, the negative electrode, or the electrolyte layer comprises the solid-state ion conductor of claim 1 .

Assignees

• Samsung Electronics Co Ltd
• Univ California

Inventors

• Ceder Gerbrand
• Wang Jingyang
• Ouyang Bin
• Wang Yan
• Lacivita Valentina

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title