All-solid-state battery including negative electrode layer in thick-film form and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2024339596-A1
Application number	US-202318240055-A
Country	US
Kind code	A1
Filing date	Aug 30, 2023
Priority date	Apr 7, 2023
Publication date	Oct 10, 2024
Grant date	—

Abstract

Disclosed are an all-solid-state battery including a negative electrode layer in a thick-film form with a plurality of lithiophilic layers and a method of manufacturing the same.

First claim

What is claimed is:

1 . An all-solid-state battery comprising:
a negative electrode current collector; a negative electrode layer disposed on the negative electrode current collector; a solid electrolyte layer disposed on the negative electrode layer; a positive electrode layer disposed on the solid electrolyte layer; and a positive electrode current collector disposed on the positive electrode layer, wherein the negative electrode layer comprises: a first lithiophilic layer disposed on the negative electrode current collector and comprising a first metal capable of alloying with lithium, an oxide of the first metal, or combinations thereof; a first negative electrode active material layer disposed on the first lithiophilic layer and comprising a first negative electrode active material; a second lithiophilic layer disposed on the first negative electrode active material layer and comprising a second metal capable of alloying with lithium, an oxide of the second metal, or combinations thereof; and a second negative electrode active material layer disposed on the second lithiophilic layer and comprising a second negative electrode active material.

2 . The all-solid-state battery of claim 1 , wherein the first metal comprises lithium, indium, gold, silver, bismuth, zinc, aluminum, iron, tin, titanium, or combinations thereof.

3 . The all-solid-state battery of claim 1 , wherein the first negative electrode active material comprises a carbon-based active material, a silicon-based active material, or combinations thereof.

4 . The all-solid-state battery of claim 1 , wherein the second metal comprises lithium, indium, gold, silver, bismuth, zinc, aluminum, iron, tin, titanium, or combinations thereof.

5 . The all-solid-state battery of claim 1 , wherein the second negative electrode active material comprises a carbon-based active material, a silicon-based active material, or combinations thereof.

6 . The all-solid-state battery of claim 1 , wherein the negative electrode layer has a thickness in a range of about 70 μm to 150 μm.

7 . The all-solid-state battery of claim 1 , wherein the negative electrode layer comprises:
a first main surface being in contact with the negative electrode current collector; and a second main surface being in contact with the solid electrolyte layer, and wherein the second lithiophilic layer is positioned in a space between a first plane spaced from the first main surface toward the solid electrolyte layer by a distance corresponding to about 40% of the thickness of the negative electrode layer along a direction of the thickness and a second plane spaced from the second main surface toward the negative electrode current collector by a distance corresponding to about 40% of the thickness of the negative electrode layer along a direction of the thickness.

8 . The all-solid-state battery of claim 1 , wherein the all-solid-state satisfies Condition 1,

[

Condition
⁢

1

]



x
1

3

≤

x
2

≤

x
1

2

wherein x 1 is a thickness of the first lithiophilic layer, and x 2 is a thickness of the second lithiophilic layer.

9 . A method of manufacturing an all-solid-state battery, comprising:
forming a negative electrode layer on a negative electrode current collector; forming a solid electrolyte layer on the negative electrode layer; forming a positive electrode layer on the solid electrolyte layer; and forming a positive electrode current collector on the positive electrode layer, wherein the forming of the negative electrode layer comprises: forming a first lithiophilic layer by depositing a first metal capable of alloying with lithium, an oxide of the first metal, or combinations thereof on the negative electrode current collector; forming a first negative electrode active material layer comprising a first negative electrode active material on the first lithiophilic layer; forming a second lithiophilic layer by depositing a second metal capable of alloying with lithium, an oxide of the second metal, or combinations thereof on the first negative electrode active material layer; and forming a second negative electrode active material layer comprising a second negative electrode active material on the second lithiophilic layer.

10 . The method of claim 9 , wherein the first metal comprises lithium, indium, gold, silver, bismuth, zinc, aluminum, iron, tin, titanium, or combinations thereof.

11 . The method of claim 9 , wherein in the forming of the first lithiophilic layer, the first metal, the oxide of the first metal, or the combinations thereof is sputtered on the negative electrode current collector.

12 . The method of claim 9 , wherein the first negative electrode active material comprises a carbon-based active material, a silicon-based active material, or combinations thereof.

13 . The method of claim 9 , wherein the second metal comprises lithium, indium, gold, silver, bismuth, zinc, aluminum, iron, tin, titanium, or combinations thereof.

14 . The method of claim 9 , wherein in the forming of the second lithiophilic layer, second metal, the oxide of the second metal, or the combinations thereof is sputtered on the first negative electrode active material layer.

15 . The method of claim 9 , wherein the second negative electrode active material comprises a carbon-based active material, a silicon-based active material, or combinations thereof.

16 . The method of claim 9 , wherein the negative electrode layer has a thickness in a range of about 70 μm to 150 μm.

17 . The method of claim 9 , wherein the negative electrode layer comprises:
a first main surface being in contact with the negative electrode current collector; and a second main surface being in contact with the solid electrolyte layer, and wherein the second lithiophilic layer is positioned in a space between a first plane spaced from the first main surface toward the solid electrolyte layer by a distance corresponding to about 40% of the thickness of the negative electrode layer along a direction of the thickness and a second plane spaced from the second main surface toward the negative electrode current collector by a distance corresponding to about 40% of the thickness of the negative electrode layer along a direction of the thickness.

18 . The method of claim 9 , wherein the all-solid-state satisfies Condition 1,

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Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Kim Dong Hyun
• Lee Ju Yeon
• Rim Jae Hyeon
• Han Yoon Jae
• Choi Chang Young
• Kim Sang Mo
• Kim Yoon Gon

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title