Cross-Linkable Solid Electrolyte Membrane for All-Solid-State Batteries and Method of Manufacturing the Same

Patent metadata

Field	Value
Publication number	US-2024145772-A1
Application number	US-202318467433-A
Country	US
Kind code	A1
Filing date	Sep 14, 2023
Priority date	Nov 2, 2022
Publication date	May 2, 2024
Grant date	—

Abstract

An embodiment composition for solid electrolyte membranes of all-solid-state batteries includes a sulfide-based solid electrolyte and a cross-linking agent including two or more acrylate functionalities. An embodiment method of manufacturing a solid electrolyte membrane for an all-solid-state battery includes forming a composition including a sulfide-based solid electrolyte and a cross-linking agent including two or more acrylate functionalities and cross-linking the composition.

First claim

What is claimed is:

1 . A composition for solid electrolyte membranes of all-solid-state batteries, the composition comprising:
a sulfide-based solid electrolyte; and a cross-linking agent comprising two or more acrylate functionalities.

2 . The composition of claim 1 , wherein the sulfide-based solid electrolyte comprises an electrolyte selected from the group consisting of Li 6 PS 5 X (X═Cl, Br or I), Li 10 GeP 2 S 12 , Li 3 PS 4 , and Li 7 P 3 S 11 and any combination thereof.

3 . The composition of claim 1 , wherein the cross-linking agent comprises a cross-linking agent selected from the group consisting of tetraethylene glycol diacrylate (TEGDA), polyethylene glycol diacrylate (PEGDA), and trimethylolpropane trimethacrylate and any combination thereof.

4 . The composition of claim 1 , wherein the composition comprises the cross-linking agent in an amount of 10 parts by weight to 15 parts by weight based on 100 parts by weight of the sulfide-based solid electrolyte.

5 . The composition of claim 1 , wherein the composition further comprises a lithium salt that is selected from the group consisting of LiN(SO 2 F) 2 , LiN(SO 2 C 2 F 5 ) 2 , LiN(SO 2 C 2 F 3 ) 2 , LiN(CF 3 SO 2 ) 2 , LiPF 6 , LiBF 4 , LiClO 4 , LiCF 3 SO 3 , LiC 4 F 9 O 3 , LiC 6 H 5 SO 3 , LiSCN, LiB(C 2 O 4 ) 2 , and LiPO 2 F 2 and any combination thereof.

6 . The composition of claim 5 , wherein the composition comprises the lithium salt in an amount of 15 parts by weight to 20 parts by weight based on 100 parts by weight of the sulfide-based solid electrolyte.

7 . The composition of claim 1 , further comprising a solvent, selected from the group consisting of N-butyl butyrate, benzyl acetic acid, 1,4-dichlorobutane, and dichlorobenzene and any combination thereof.

8 . The composition of claim 1 , further comprising an initiator selected from the group consisting of t-amyl-based compounds and azobis-based compounds and combinations thereof.

9 . A solid electrolyte membrane for an all-solid-state battery, the solid electrolyte membrane comprising a cross-linked product of the composition of claim 1 .

10 . The solid electrolyte membrane of claim 9 , wherein the solid electrolyte membrane is a self-supporting membrane.

11 . The solid electrolyte membrane of claim 9 , wherein the solid electrolyte membrane has a thickness of 50 μm to 250 μm.

12 . A method of manufacturing a solid electrolyte membrane for an all-solid-state battery, the method comprising:
forming a composition comprising:
a sulfide-based solid electrolyte; and
a cross-linking agent comprising two or more acrylate functionalities; and
cross-linking the composition.

13 . The method of claim 12 , wherein cross-linking the composition comprises heating the composition to a temperature of 50° C. to 90° C.

14 . The method of claim 12 , wherein the solid electrolyte membrane is formed to have a thickness of 50 μm to 250 μm.

15 . An all-solid-state battery comprising:
a cathode; an anode; and a solid electrolyte membrane disposed between the cathode and the anode, the solid electrolyte membrane comprising a cross-linked composition comprising a sulfide-based solid electrolyte and a cross-linking agent comprising two or more acrylate functionalities.

16 . The all-solid-state battery of claim 15 , wherein the anode comprises lithium metal or a lithium alloy.

17 . The all-solid-state battery of claim 15 , wherein the anode has a thickness of 10 μm to 200 μm.

18 . The all-solid-state battery of claim 15 , wherein the cathode comprises a cathode active material selected from the group consisting of LiCoO 2 , Li(Ni x Co y Mn z )O 2 (x+y+z=1), Li(Ni x Co y Al z )O 2 (x+y+z=1), and LiFePO 4 and any combination thereof.

19 . The all-solid-state battery of claim 15 , wherein the solid electrolyte membrane has a thickness of 50 μm to 250 μm.

20 . The all-solid-state battery of claim 15 , wherein the sulfide-based solid electrolyte comprises a solid electrolyte selected from the group consisting of Li 6 PS 5 X (X═Cl, Br or I), Li 10 GeP 2 S 12 , and Li 3 PS 4 , Li 7 P 3 S 11 , and any combination thereof.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Iucf Hyu

Inventors

• Kim So Yeon
• Kim Yun Sung
• Im Ga Hyeon
• Lee Yoon Kwang
• Min Hong Seok
• Lee Kyu Joon
• Kim Dong Won
• Lee Young Jun
• Sim Hui Tae
• Hong Seung Bo

Classifications

• C08J2335/02

  Characterised by the use of homopolymers or copolymers of esters (C08J2335/06, C08J2335/08 take precedence) · CPC title

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• C08L35/02

  Homopolymers or copolymers of esters (C08L35/06, C08L35/08 take precedence) · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• H01M10/052

  Li-accumulators · CPC title