Solid electrolyte membrane and solid-state battery comprising same

Patent metadata

Field	Value
Publication number	US-2022216570-A1
Application number	US-202017606545-A
Country	US
Kind code	A1
Filing date	Apr 28, 2020
Priority date	May 3, 2019
Publication date	Jul 7, 2022
Grant date	—

Abstract

Provided is a solid electrolyte membrane for a solid-state battery, including at least two solid electrolyte layers and at least one volume-swelling layer, wherein the volume-swelling layer is disposed between the solid electrolyte layers. The solid electrolyte membrane includes (a) an ion conductive solid electrolyte material, and the volume-swelling layer includes (b) inorganic particles, wherein the inorganic particles form an alloy with lithium and include a metal, metal oxide or both. Thus, it is possible to provide a solid electrolyte membrane for a solid-state battery fundamentally prevented from a short-circuit by inhibiting growth of lithium dendrite.

First claim

1 . A solid electrolyte membrane for a solid-state battery, comprising:
(a) an ion conductive solid electrolyte material; and (b) inorganic particles capable of lithium ion or lithium intercalation, wherein the inorganic particles comprise a metal and/or metal oxide, and wherein during operation of the solid-state battery, the inorganic particles react physically, chemically or electrochemically with lithium ions or lithium so that they are lithiated, undergo volumetric swelling by the lithiation, and are disposed in such a manner that they are not in direct contact with an electrode.

2 . The solid electrolyte membrane according to claim 1 , which further comprises:
at least two solid electrolyte layers; and at least one volume-swelling layer, wherein the volume-swelling layer is disposed between the at least two solid electrolyte layers and includes the inorganic particles (b) capable of lithium ion or lithium intercalation.

3 . The solid electrolyte membrane according to claim 1 , wherein the inorganic particles (b) have a volumetric swelling ratio of 10-1000% after the lithiation as compared to a volume before the lithiation.

4 . The solid electrolyte membrane according to claim 1 , wherein the inorganic particles comprise Si, Sn, SiO, SnO, MnO 2 , Fe 2 O 3 , or two or more of them.

5 . The solid electrolyte membrane according to claim 1 , wherein the inorganic particles (b) are present in an amount of 1-30 wt % based on 100 wt % of the solid electrolyte membrane.

6 . The solid electrolyte membrane according to claim 2 , wherein the volume-swelling layer has a thickness of 10 nm to 50 μm.

7 . The solid electrolyte membrane according to claim 1 , wherein the ion conductive solid electrolyte material (a) has an ion conductivity of 10 −5 S/cm or more, and comprises a polymeric solid electrolyte, oxide-based solid electrolyte, sulfide-based solid electrolyte, or two or more of them.

8 . The solid electrolyte membrane according to claim 2 , wherein the volume-swelling layer comprises the inorganic particles (b) in an amount of 30-100 wt % based on 100 wt % of the volume-swelling layer.

9 . The solid electrolyte membrane according to claim 1 , wherein the inorganic particles are patterned with a plurality of pattern units, and the pattern units are distributed regularly or randomly.

10 . The solid electrolyte membrane according to claim 9 , wherein the solid electrolyte membrane further comprises:
at least two solid electrolyte layers; and at least one volume-swelling layer, wherein the volume-swelling layer is disposed between the at least two solid electrolyte layers, the volume-swelling layer comprises the inorganic particles (b) and a copolymer to which the inorganic particles are chemically bound, and has a micropattern derived from self-assembly of the copolymer, the copolymer comprises a functional group capable of forming chemical binding with the inorganic particles, and the inorganic particles are bound to the copolymer by means of the functional group.

11 . A solid-state battery comprising a positive electrode, a negative electrode and a solid electrolyte membrane interposed between the positive electrode and the negative electrode, wherein the solid electrolyte membrane is the same as defined in claim 1 .

12 . The solid-state battery according to claim 11 , wherein the solid electrolyte membrane comprises a first solid electrolyte layer, a second solid electrolyte layer and a volume-swelling layer, wherein the volume-swelling layer is disposed between the first and second solid electrolyte layers, the volume-swelling layer includes the inorganic particles (b) capable of lithium ion or lithium intercalation, the first solid electrolyte layer faces the negative electrode, and the first solid electrolyte layer has a thickness larger than a thickness of the second solid electrolyte layer.

Assignees

• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M2300/0094

  in the form of layered products, e.g. coatings · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M10/056 Primary

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

• H01M50/451 Primary

  comprising layers of only organic material and layers containing inorganic material · CPC title