Electrolyte membrane for all-solid-state battery, and all-solid-state battery including same

Patent metadata

Field	Value
Publication number	US-11876247-B2
Application number	US-202017312741-A
Country	US
Kind code	B2
Filing date	Apr 20, 2020
Priority date	Apr 18, 2019
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

The present disclosure relates to a solid electrolyte membrane for an all-solid-state battery and a battery comprising the same. In the present disclosure, the battery may comprise lithium metal as a negative electrode active material. The solid electrolyte membrane for an all-solid-state battery according to the present disclosure comprises a guide layer comprising metal particles to guide the horizontal growth of lithium dendrites, thereby delaying an electrical short caused by dendrite growth. Additionally, the guide layer is formed by polymer self-assembly, and thus the metal particles may be uniformly distributed in a very regular pattern within the guide layer.

First claim

What is claimed is:

1. An all-solid-state battery comprising
a solid electrolyte membrane, the solid electrolyte membrane comprising a guide layer,
wherein the solid electrolyte membrane comprises a solid electrolyte material and metal particles,
wherein the metal particles form an alloy with lithium during operation of the battery, and
further wherein the guide layer is disposed in a layer shape within the solid electrolyte membrane and is patterned such that the guide layer comprises a plurality of pattern units comprising a guide material, and the pattern units are regularly distributed in the guide layer.

2. The all-solid-state battery according to claim 1 , wherein the guide layer comprises the guide material and a copolymer to which the guide material is chemically bonded, the guide layer has a pattern derived from self-assembly of the copolymer, the copolymer comprises a functional group capable of forming a chemical bond with the guide material, and the guide material and the copolymer are connected through the functional group.

3. The all-solid-state battery according to claim 1 , wherein the metal particles have a Li metal nucleation overpotential of 100 mV or less.

4. The all-solid-state battery according to claim 1 , wherein the solid electrolyte membrane comprises at least one of Au, Ag, Pt, Zn, Mg, Al, Ni and Bi as the metal particles.

5. The all-solid-state battery according to claim 1 , wherein the guide layer is 1 nm to 1,000 nm in thickness.

6. The all-solid-state battery according to claim 1 , wherein the solid electrolyte material comprises a polymer-based solid electrolyte material.

7. The all-solid-state battery according to claim 6 , wherein the polymer-based solid electrolyte material comprises a polymer resin and a lithium salt, and further wherein the polymer-based solid electrolyte material exhibits ionic conductivity of 1×10 −7 S/cm or above.

8. The all-solid-state battery according to claim 1 , wherein the metal particles have a particle size of 1 nm to 5 μm.

9. The all-solid-state battery according to claim 1 , wherein the metal particles are present in an amount of 0.1 wt % to 20 wt % based on 100 wt % of the solid electrolyte membrane.

10. The all-solid-state battery according to claim 1 , wherein the all-solid-state battery comprises a negative electrode comprising a lithium metal as a negative electrode active material or a current collector with no negative electrode active material.

11. The all-solid-state battery according to claim 1 , wherein the all-solid-state battery comprises a negative electrode, a positive electrode and a solid electrolyte membrane,
the solid electrolyte membrane is interposed between the negative electrode and the positive electrode,
at least one of the negative electrode and the positive electrode comprises a solid electrolyte material, and
the solid electrolyte material comprises at least one of a polymer-based solid electrolyte, an oxide-based solid electrolyte and a sulfide-based solid electrolyte.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lee Jung-Pil
• Kim Eun-Bee
• Ryu Ji-Hoon
• Lee Suk-Woo

Classifications

• H01M50/446 Primary

  Composite material consisting of a mixture of organic and inorganic materials · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/028

  Positive electrodes · CPC title