Electrode assembly and rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-2025030139-A1
Application number	US-202418664121-A
Country	US
Kind code	A1
Filing date	May 14, 2024
Priority date	Jul 19, 2023
Publication date	Jan 23, 2025
Grant date	—

Abstract

An electrode assembly for a rechargeable battery according may include a stacked-type electrode assembly in which positive electrodes, separators, and negative electrodes are alternately stacked, wherein the positive electrode on an outermost side of the stacked-type electrode assembly, the positive electrode includes a substrate having an electrode uncoated region and an electrode active region, an active material layer formed on one surface of the substrate in the electrode active region, and a ceramic layer formed on the opposite surface of the substrate in the electrode active region, and the one surface is relatively adjacent to the center and faces the negative electrode.

First claim

What is claimed is:

1 . An electrode assembly comprises:
a stacked-type electrode assembly in which positive electrodes, separators, and negative electrodes are alternately stacked, wherein the positive electrode is on an outermost side of the stacked-type electrode assembly, the positive electrode comprises a substrate having an electrode uncoated region and an electrode active region, an active material layer on one surface of the substrate in the electrode active region, and a ceramic layer on the opposite surface of the substrate in the electrode active region, and the one surface of the substrate is facing toward the negative electrode and the center of the stacked-type electrode assembly in a stacking direction of the stacked-type electrode assembly.

2 . The electrode assembly as claimed in claim 1 , further comprising
a functional layer between the substrate and the active material layer.

3 . The electrode assembly as claimed in claim 2 , wherein,
the functional layer comprises a first portion that overlaps the electrode active region and a second portion that extends from the first portion to the electrode uncoated region.

4 . The electrode assembly as claimed in claim 3 , wherein,
the ceramic layer is in the same planar shape as the functional layer.

5 . The electrode assembly as claimed in claim 3 , wherein,
the area of the second portion is less than about 60% of the electrode uncoated region.

6 . The electrode assembly as claimed in claim 5 , wherein,
the width of the second portion is about 0.1 mm to about 3 mm.

7 . The electrode assembly as claimed in claim 2 , wherein,
a resistance value of the functional layer is greater than each of the substrate and the active material layer.

8 . The electrode assembly as claimed in claim 2 , wherein,
a boundary of the functional layer is positioned within a boundary of the substrate.

9 . The electrode assembly as claimed in claim 2 , wherein:
the functional layer comprises a material comprising a compound represented by Chemical Formula 1, a compound represented by Chemical Formula 2, or a combination thereof:
Li a1 M 1 x1 Fe 1−x1 PO 4   Chemical Formula 1

in Chemical Formula 1, 0.90≤a1≤1.5, 0≤x1≤0.4, and M 1 is Mg, Co, Ni or a combination thereof.
Li a2 Mn x2 Fe 1−x2 PO 4   Chemical Formula 2

in Chemical Formula 2, 0.90≤a2≤1.5, 0.1≤x2≤1.

10 . The electrode assembly as claimed in claim 1 , wherein,
the width of the electrode uncoated region is about 2 mm to about 7 mm.

11 . The electrode assembly as claimed in claim 1 , wherein,
the electrode uncoated region protrudes from one side of the electrode active region.

12 . The electrode assembly as claimed in claim 11 , wherein,
a distance between a border of the positive electrode and a border of the negative electrode is about 0.5 mm to about 3.0 mm.

13 . A rechargeable battery comprising:
the electrode assembly as claimed in claim 1 and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ha Jaehwan
• Kim Duckhyun
• Lee Dong Myung
• Yoo Heeeun

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0585 Primary

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

• H01M4/667

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