Flexible solid electrolyte membrane for all-solid-state battery, all-solid-state battery comprising the same, and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2024039036-A1
Application number	US-202218085996-A
Country	US
Kind code	A1
Filing date	Dec 21, 2022
Priority date	Jul 28, 2022
Publication date	Feb 1, 2024
Grant date	—

Abstract

A flexible self-supporting solid electrolyte membrane, an all-solid-state battery including the membrane, and a manufacturing method thereof are disclosed. The solid electrolyte membrane may include: a substrate including pores therein; and a solid electrolyte layer disposed on at least one surface of the substrate and including a solid electrolyte and a cured compound. At least a portion of the solid electrolyte layer may penetrate into the pores of the substrate to form a conduction path of lithium ions in a thickness direction of the substrate.

First claim

What is claimed is:

1 . A solid electrolyte membrane comprising:
a substrate comprising pores therein; and a solid electrolyte layer disposed on at least one surface of the substrate and comprising a solid electrolyte and a cured compound, wherein at least a portion of the solid electrolyte layer penetrates into the pores of the substrate and the solid electrolyte is filled in the pores of the substrate.

2 . The solid electrolyte membrane of claim 1 , wherein the solid electrolyte is filled in the substrate based on a thickness direction of the substrate to form a conduction path of lithium ions in the substrate.

3 . The solid electrolyte membrane of claim 1 , wherein the solid electrolyte comprises a sulfide-based solid electrolyte.

4 . The solid electrolyte membrane of claim 1 , wherein the cured compound is derived from a monomer comprising at least one of: a triacrylate-based monomer, a diacrylate-based monomer, a monoacrylate-based monomer, or any combination thereof.

5 . The solid electrolyte membrane of claim 1 , wherein the cured compound is derived from a monomer having a viscosity of about 20 cP to 100 cP.

6 . The solid electrolyte membrane of claim 1 , wherein the solid electrolyte layer comprises the solid electrolyte and the cured compound at a weight ratio of about 95:5 to 98:2.

7 . The solid electrolyte membrane of claim 1 , wherein the solid electrolyte membrane has a thickness in range of about 20 μm to 30 μm.

8 . An all-solid-state battery comprising:
the solid electrolyte membrane of claim 1 ; a cathode disposed on one surface of the solid electrolyte membrane; and an anode disposed on another surface of the solid electrolyte membrane.

9 . A manufacturing method comprising:
preparing a slurry comprising a solvent, a solid electrolyte, and a monomer; forming a coating layer by applying and drying the slurry on at least one surface of a substrate comprising pores therein; curing the coating layer to obtain a solid electrolyte membrane comprising the substrate and a solid electrolyte layer disposed on at least one surface of the substrate, wherein the solid electrolyte layer comprises the solid electrolyte and a cured compound; and manufacturing an all-solid-state battery comprising the solid electrolyte membrane, a cathode disposed on one surface of the solid electrolyte membrane, and an anode disposed on another surface of the solid electrolyte membrane, wherein at least a portion of the solid electrolyte layer penetrates into the pores of the substrate to form a conduction path of lithium ions in a thickness direction of the substrate.

10 . The manufacturing method of claim 9 , wherein the solvent has a vapor pressure of about 1 hPa or less.

11 . The manufacturing method of claim 9 , wherein the solvent comprises hexyl butyrate.

12 . The manufacturing method of claim 9 , wherein the solid electrolyte comprises a sulfide-based solid electrolyte.

13 . The manufacturing method of claim 9 , wherein the monomer comprises at least one of: a triacrylate-based monomer, a diacrylate-based monomer, a monoacrylate-based monomer, or any combination thereof.

14 . The manufacturing method of claim 9 , wherein the monomer has a viscosity of about cP to 100 cP.

15 . The manufacturing method of claim 9 , wherein the slurry comprises:
an amount of about 40% to 55% by weight of the solid electrolyte and the monomer; and an amount of about 45% to 60% by weight of the solvent.

16 . The manufacturing method of claim 9 , wherein the coating layer is cured by irradiating ultraviolet rays.

17 . The manufacturing method of claim 9 , wherein the solid electrolyte layer comprises the solid electrolyte and the cured compound at a weight ratio of about 95:5 to 98:2.

18 . The manufacturing method of claim 9 , wherein the solid electrolyte membrane has a thickness in range of about 20 μm to 30 μm.

19 . The manufacturing method of claim 9 , wherein the manufacturing the all-solid-state battery comprises:
laminating a plurality of solid electrolyte membranes and pressurizing the plurality of solid electrolyte membranes at a pressure of about 50 MPa to 100 MPa to obtain a laminate, wherein the plurality of solid electrolyte membranes comprises the solid electrolyte membrane; and attaching the cathode and the anode to both surfaces of the laminate, respectively.

20 . The manufacturing method of claim 9 , wherein the all-solid-state battery is configured to be charged and discharged in a pressurized state at a pressure of about 200 MPa to 400 MPa.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Ulsan National Institute Of Science And Tech

Inventors

• Seok Hoon
• Cheon Yeong Jun
• Min Hong Seok
• Lee Sang Young
• Oh Kyeong Seok
• Lee Yong Hyeok

Classifications

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M10/446

  Initial charging measures · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title