Method for producing a solid electrolyte material and a solid electrolyte for solid state batteries

Patent metadata

Field	Value
Publication number	US-2020411904-A1
Application number	US-201816976406-A
Country	US
Kind code	A1
Filing date	Mar 26, 2018
Priority date	Mar 26, 2018
Publication date	Dec 31, 2020
Grant date	—

Abstract

A method for producing a solid electrolyte for an all-solid state battery, the solid electrolyte having the following chemical formula XM 2 (PS 4 ) 3 , where X is lithium (Li), sodium (Na), silver (Ag) or magnesium (Mg 0.5 ) and M is titanium (Ti), zirconium (Zr), germanium (Ge), silicon (Si), tin (Sn) or a mixture of X and aluminium (X+Al) and the method including: mixing powders so as to obtain a powder mixture; pressing a component with powder mixture; and sintering component for a period of time equal to or greater than 100 hours so as to obtain the solid electrolyte. The solid electrolyte exhibits the peaks in positions of 2θ=13.64° (±1°), 13.76° (±1°), 14.72° (±1°), 15.36° (±1°), 15.90° (±1°), 16.48° (±1°), 17.42° (±1°), 17.56° (±1°), 18.58° (±1°), and 22.18° (±1°) in a X-ray diffraction measurement using CuKα line. The disclosure is also related to a method of producing a solid electrolyte.

First claim

1 . A method for producing a solid electrolyte material for a solid state battery, the solid electrolyte material having the following chemical formula XM 2 (PS 4 ) 3 , where P is phosphorus, S is sulfur and X is lithium (Li), sodium (Na), silver (Ag) or magnesium (Mg 0.5 ) and M is titanium (Ti), zirconium (Zr), germanium (Ge), silicon (Si), tin (Sn) or a mixture of X and aluminium (X+Al) and the method comprising:
mixing powders so as to obtain a powder mixture; and sintering the powder mixture for a period of time equal to or greater than 75 hours and equal to or smaller than 500 hours at a sintering plateau temperature so as to obtain the solid electrolyte material; wherein the solid electrolyte material exhibits the peaks in positions of 2θ=13.64° (±1°), 16.48° (±1°) and 22.18° (±1°) in a X-ray diffraction measurement using CuKaα line, where I A is the intensity in arbitrary units of the peak at 13.64° (±1° and I B is the intensity in arbitrary units of a peak at 23.34° (±1°), (I A −I B )/(I A +I B )>0. (±1°), (I A −I B )/(I A +I B )>0.

2 . The method according to claim 1 , wherein the solid electrolyte material exhibits the peaks in positions of 2θ=13.64° (±1°), 13.76° (±1°), 14.72° (±1°), 15.36° (±1°), 15.90° (±1°), 16.48° (±1°), 17.42° (±1°), 17.56° (±1°), 18.58° (±1°), and 22.18° (±1°) in a X-ray diffraction measurement using CuKα line.

3 . The method according to claim 1 , wherein the component is placed in a container and sealed under Argon at a pressure equal to or smaller than 100 Pa.

4 . The method according to claim 1 , wherein the method comprises a step of amorphasizing the powder mixture so as to obtain an amorphasized powder mixture.

5 . The method according to claim 1 , wherein the sintering plateau temperature equal to or smaller than 500° C.

6 . The method according to claim 1 , wherein the sintering plateau time is equal to or greater than 100 hours and equal to or smaller than 400 hours.

7 . The method according to claim 1 , wherein the powder mixture is pressed at a pressure equal to or greater than 25 MPa and equal to or smaller than 500 MPa.

8 . The method according to claim 1 , wherein X is lithium.

9 . The method according to claim 1 , wherein M is titanium.

10 . The method according to claim 7 , wherein M is a mixture of lithium and aluminium (Li+Al).

11 . The method according to claim 7 , wherein the diffusion coefficient of lithium in the solid electrolyte material at −20° C. is greater than or equal to 3 10 −12 m 2 /s.

12 . A method for producing a solid electrolyte for a solid state battery, comprising the steps of producing a solid electrolyte material according to claim 1 .

Assignees

• Toyota Motor Europe

Inventors

• Katoh Yuki
• Hautier Geoffroy
• Di Stefano Davide
• Filinchuk Yaroslav

Classifications

• C03C4/18

  for ion-sensitive glass · CPC title

• C04B2235/3217

  Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina · CPC title

• C01P2006/40

  Electric properties · CPC title

• C03C3/321

  Chalcogenide glasses, e.g. containing S, Se, Te · CPC title

• C04B2235/3206

  Magnesium oxides or oxide-forming salts thereof · CPC title