Lithium ion conducting solid materials

Patent metadata

Field	Value
Publication number	US-12500261-B2
Application number	US-202017629143-A
Country	US
Kind code	B2
Filing date	Jul 21, 2020
Priority date	Jul 24, 2019
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

Described are a solid material which has ionic conductivity for lithium ions, a process for preparing said solid material, a use of said solid material as a solid electrolyte for an electrochemical cell, a solid structure selected from the group consisting of a cathode, an anode and a separator for an electrochemical cell comprising the solid material, and an electrochemical cell comprising such solid structure.

First claim

The invention claimed is:

1 . A solid material having a composition according to general formula (I)
Li 7+x-y M x Sb 1-x S 6-y X y wherein M is one or more selected from the group consisting of Si, Ge and Sn; 0≤x<1; X is one or more selected from the group consisting of Cl, Br and I; 0.05≤y≤2.

2 . The solid material according to claim 1 , wherein
0.05≤x<1 and/or 0.5≤y≤1.5.

3 . The solid material according to claim 2 , wherein
M is Si; 0.1≤x≤0.8; 0.5≤y≤1.5.

4 . The solid material according to claim 2 , wherein
M is Ge; 0.1≤x≤0.5; 0.5≤y≤1.5.

5 . The solid material according to claim 2 , wherein
M is Sn; 0.1≤x≤0.3; 0.5≤y≤1.5.

6 . The solid material according to claim 1 , wherein X is I.

7 . The solid material according to claim 1 , wherein the solid material comprises a crystalline phase having the argyrodite structure.

8 . A process for preparing a solid material as defined in claim 1 , comprising
a) preparing or providing a reaction mixture comprising the precursors
(1) Li 2 S
(2) one or both of Sb 2 S 3 and elemental Sb
(3) one or more compounds LiX wherein X is selected from the group consisting of Cl, Br and I
(4) elemental S
(5) optionally one or more species selected from the group consisting of M in elemental form and sulfides of M, wherein in each case M is selected from the group consisting of Si, Ge and Sn
wherein in the reaction mixture the molar ratio of the elements Li, M, Sb, S and X matches general formula (I)
b) heat-treating the reaction mixture in a temperature range of from 400° C. to 600° C. for a total duration of 40 hours to 200 hours to obtain a reaction product c) cooling the reaction product obtained in step b) so that a solid material having a composition according to general formula (I) is obtained.

9 . The process according to claim 8 , further comprising
d) annealing the solid material obtained in step c) in a temperature range of from 400° C. to 600° C. for a duration of 40 hours to 200 hours.

10 . The process according to claim 8 , wherein the precursors are
(1) Li 2 S, (2) Sb 2 S 3 , (3) LiI, (4) S and (5) one of elemental Si, elemental Ge, elemental Sn, SiS 2 , GeS 2 and SnS 2 .

11 . A solid electrolyte for an electrochemical cell comprising the solid material according to claim 1 .

12 . A solid structure for an electrochemical cell, wherein the solid structure is selected from the group consisting of cathode, anode and separator, wherein the solid structure for an electrochemical cell comprises a solid material according to claim 1 .

13 . An electrochemical cell comprising a solid material according to claim 1 .

14 . The electrochemical cell according to claim 13 , wherein the solid material is a component of a solid structure, and wherein the solid structure is selected from the group consisting of cathode, anode and separator.

15 . The solid electrolyte for an electrochemical cell according to claim 11 , wherein the solid electrolyte is a component of a solid structure for an electrochemical cell selected from the group consisting of cathode, anode, and separator.

Assignees

• Basf Se
• Univ Waterloo

Inventors

• Wu Xiaohan
• Zhou Laidong
• Nazar Linda
• Kulisch Jörn

Classifications

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M2300/008

  Halides · CPC title

• H01M10/0525

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

• H01M2300/0068

  inorganic · CPC title

• C01B17/22

  Alkali metal sulfides or polysulfides · CPC title