Solid electrolyte for all-solid sodium battery, method for producing same, and all-solid sodium battery

Patent metadata

Field	Value
Publication number	US-11830985-B2
Application number	US-201917260361-A
Country	US
Kind code	B2
Filing date	Jul 23, 2019
Priority date	Jul 24, 2018
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A solid electrolyte for an all-solid-state sodium battery, represented by formula: Na3−xSb1−xαxS4, wherein α is selected from elements that provide Na3−xSb1−xαxS4 exhibiting a higher ionic conductivity than Na3SbS4, and x is 0<x<1.

First claim

What is claimed is:

1. A solid electrolyte for an all-solid-state sodium battery, represented by formula:
Na 3−x Sb 1−x α x S 4

wherein α is selected from hexavalent elements wherein the hexavalent element is selected from W, Mo, Cr, Mn, Ru, Re, Os and Ir that provide Na 3−x Sb 1−x α x S 4 exhibiting a higher ionic conductivity than Na 3 SbS 4 , and x is 0<x<1.

2. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , wherein α is selected from W and Mo.

3. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , wherein α is W.

4. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , wherein x represents a value within a range that can provide the solid electrolyte exhibiting a higher ionic conductivity than Na 3 SbS 4 .

5. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , wherein x is 0.05≤x≤0.2.

6. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , which is in the form of glass ceramics.

7. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , comprising at least a crystalline part, wherein the crystalline part contains a cubic crystal.

8. The solid electrolyte for an all-solid-state sodium battery according to claim 1 , exhibiting an anion peak derived from αS 4 in a Raman spectrum.

9. A method for producing the solid electrolyte according to claim 1 , comprising:
mixing raw materials for production of the solid electrolyte with mechanical milling wherein the raw materials are selected from Na 2 S, Sb 2 S 3 , S, and αSz, wherein z is a number defined according to a valence of α; and
pressing the obtained mixture.

10. The method for producing the solid electrolyte, according to claim 9 , comprising, after pressing the mixture, heating the pressed mixture at a temperature of 200° C. to 550° C. for 0.1 hours or more.

11. An all-solid-state sodium battery comprising: a positive electrode, a negative electrode; and a solid electrolyte layer between the positive electrode and the negative electrode, wherein the solid electrolyte layer comprises the solid electrolyte according to claim 1 .

12. The all-solid-state sodium battery according to claim 11 , exhibiting a charge/discharge capacity of 250 mAh g −1 or more.

Assignees

• Univ Osaka Public Corp

Inventors

• Hayashi Akitoshi
• Tatsumisago Masahiro
• Sakuda Atsushi

Classifications

• H01M10/36 Primary

  Accumulators not provided for in groups H01M10/05-H01M10/34 · CPC title

• H01M4/0407

  by coating on an electrolyte layer · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2300/0068

  inorganic · CPC title