Solid-state electrolyte and all-solid-state battery

Patent metadata

Field	Value
Publication number	US-11267716-B2
Application number	US-201816235376-A
Country	US
Kind code	B2
Filing date	Dec 28, 2018
Priority date	Sep 20, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A NaSICON-type solid-state electrolyte that contains Na as a conducting species, Zr, M, Si, P, and O, where M is at least one element selected from Mg, V, and Nb. The NaSICON-type solid-state electrolyte has a composition in which a molar ratio of M to Zr (M/Zr) is less than 0.2.

First claim

The invention claimed is:

1. A NaSICON solid-state electrolyte comprising:
Na as a conducting species;
Zr;
M;
Si;
P; and
O,
wherein M is at least one element selected from Mg, V, and Nb, and
wherein the NaSICON solid-state electrolyte has a composition in which a molar ratio of M to Zr (M/Zr) is less than 0.2.

2. The NaSICON solid-state electrolyte according to claim 1 , wherein the molar ratio of M to Zr (M/Zr) is less than 0.1.

3. The NaSICON solid-state electrolyte according to claim 1 , wherein the molar ratio of M to Zr (M/Zr) is more than 0.02 and less than 0.2.

4. The NaSICON solid-state electrolyte according to claim 1 , wherein the molar ratio of M to Zr (M/Zr) is more than 0.05 and less than 0.2.

5. A NaSICON solid-state electrolyte comprising:
Na as a conducting species;
Zr;
M;
Si;
P;
O; and
Y,
wherein M is at least one element selected from Mg, V, and Nb, and
wherein the NaSICON solid-state electrolyte has a composition in which a molar ratio of M to Zr (M/Zr) is less than 0.2.

6. The NaSICON solid-state electrolyte according to claim 5 , wherein the NaSICON solid-state electrolyte is represented by the formula Na 3+x (Zr 1−y Y y ) 2−z M z Si 2 PO 12 , wherein x is more than −0.2 and less than 0.8, y is more than 0 and equal to or less than 0.12, and z is more than 0 and equal to or less than 0.3.

7. The NaSICON solid-state electrolyte according to claim 5 , wherein z is 0.05 to 0.3.

8. The NaSICON solid-state electrolyte according to claim 5 , wherein z is 0.1 to 0.3.

9. The NaSICON solid-state electrolyte according to claim 5 , wherein z is 0.1 to 0.15.

10. A NaSICON solid-state electrolyte comprising:
Na as a conducting species;
Zr;
M;
Si;
P; and
O,
wherein M is at least one element selected from Mg, V, and Nb,
wherein the NaSICON solid-state electrolyte has a composition in which a molar ratio of M to Zr (M/Zr) is less than 0.2, and
wherein the NaSICON solid-state electrolyte is represented by the formula Na 3+x (Zr 1−y Y y ) 2−z M z Si 2 PO 12 , wherein x is more than −0.2 and less than 0.8, y is more than 0 and equal to or less than 0.12, and z is more than 0 and equal to or less than 0.3.

11. The NaSICON solid-state electrolyte according to claim 10 , wherein z is 0.05 to 0.3.

12. The NaSICON solid-state electrolyte according to claim 10 , wherein z is 0.1 to 0.3.

13. The NaSICON solid-state electrolyte according to claim 10 , wherein z is 0.1 to 0.15.

14. An all-solid-state battery comprising:
a solid-state electrolyte layer which includes the NaSICON solid-state electrolyte according to claim 1 ;
a positive electrode joined to a first surface of the solid-state electrolyte layer; and
a negative electrode joined to a second surface of the solid-state electrolyte layer.

15. The all-solid-state battery according to claim 14 , wherein the molar ratio of M to Zr (M/Zr) is more than 0.02 and less than 0.2.

16. An all-solid-state battery comprising:
a solid-state electrolyte layer which includes the NaSICON solid-state electrolyte according to claim 5 ;
a positive electrode joined to a first surface of the solid-state electrolyte layer; and
a negative electrode joined to a second surface of the solid-state electrolyte layer.

17. An all-solid-state battery comprising:
a solid-state electrolyte layer which includes the NaSICON solid-state electrolyte according to claim 10 ;
a positive electrode joined to a first surface of the solid-state electrolyte layer; and
a negative electrode joined to a second surface of the solid-state electrolyte layer.

18. The all-solid-state battery according to claim 17 , wherein z is 0.05 to 0.3.

19. The all-solid-state battery according to claim 17 , wherein z is 0.1 to 0.3.

20. The all-solid-state battery according to claim 17 , wherein z is 0.1 to 0.15.

Assignees

• Murata Manufacturing Co

Inventors

• Ito Akisuke
• Yoshioka Makoto
• Ishikura Takeo
• TAKANO Ryohei

Classifications

• H01B1/08

  oxides · CPC title

• C04B2235/3225

  Yttrium oxide or oxide-forming salts thereof · CPC title

• C04B35/447

  based on phosphates {, e.g. hydroxyapatite} · CPC title

• C01B33/325 Primary

  After-treatment, e.g. purification or stabilisation of solutions, granulation; Dissolution; Obtaining solid silicate, e.g. from a solution by spray-drying, flashing off water or adding a coagulant · CPC title

• H01M10/052

  Li-accumulators · CPC title