Electrode for rechargeable battery and electrode assembly and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-2024421319-A1
Application number	US-202418644982-A
Country	US
Kind code	A1
Filing date	Apr 24, 2024
Priority date	Jun 13, 2023
Publication date	Dec 19, 2024
Grant date	—

Abstract

An electrode includes: a substrate including an electrode uncoated portion and an electrode active portion; a functional layer on the substrate; and an active material layer on the functional layer of the electrode active portion. The functional layer includes a first portion overlapping the electrode active portion and a second portion extending from the first portion to the electrode uncoated portion. The electrode is for a rechargeable battery.

First claim

What is claimed is:

1 . An electrode, comprising:
a substrate comprising an electrode uncoated portion and an electrode active portion; a functional layer on the substrate; and an active material layer on the functional layer of the electrode active portion, wherein the functional layer comprises a first portion overlapping the electrode active portion and a second portion extending from the first portion to the electrode uncoated portion, and wherein the electrode is for a rechargeable battery.

2 . The electrode as claimed in claim 1 , wherein a resistance of the functional layer is greater than a resistance of the substrate and is less than a resistance of the active material layer.

3 . The electrode as claimed in claim 2 , wherein the resistance of the functional layer is 5 to 25 times greater than the resistance of the substrate.

4 . The electrode as claimed in claim 1 , wherein an area of the second portion is 60% or less than an area of the electrode uncoated portion.

5 . The electrode as claimed in claim 4 , wherein a length of the second portion is greater than 0 mm and 5 mm or less.

6 . The electrode as claimed in claim 1 , wherein a length of the electrode uncoated portion is 2 mm or more and 10 mm or less.

7 . The electrode as claimed in claim 1 , wherein a boundary line of the functional layer is within a boundary line of the substrate.

8 . The electrode as claimed in claim 1 , wherein the electrode uncoated portion protrudes from a side of the electrode active portion.

9 . The electrode as claimed in claim 1 , wherein the active material layer comprises a positive electrode active material.

10 . The electrode as claimed in claim 9 , wherein the active material layer comprises an active material represented by Chemical Formula A 1 :
Li a11 Ni x11 M 11 y11 M 12 1-x11-y11 O 2   Chemical Formula A1
wherein, in Chemical Formula A1, 0.9≤a11≤1.8, 0.3≤x11≤1, and 0≤y11≤0.7, and each of M 11 and M 12 is independently selected from among Al, B, Ce, Co, Cr, F, Mg, Mn, Mo, Nb, P, S, Si, Sr, Ti, V, W, Zr, and a combination thereof.

11 . The electrode as claimed in claim 1 , wherein the functional layer comprises 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, and 0≤x1≤0.4, and M 1 is Mg, Co, Ni, or a combination thereof, and
Li a2 Mn x2 Fe (1-x2) PO 4   Chemical Formula 2

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

12 . An electrode assembly comprising:
a first electrode comprising the electrode as claimed in claim 1 ; a second electrode having an opposite polarity to the first electrode; and a separator between the first electrode and the second electrode.

13 . The electrode assembly as claimed in claim 12 , wherein a distance between a boundary line of the first electrode and a boundary line of the second electrode is greater than 0 mm and 5 mm or less.

14 . The electrode assembly as claimed in claim 12 , wherein the first electrode, the separator, and the second electrode have a sheet shape and are alternately and repeatedly stacked.

15 . A rechargeable battery comprising the electrode assembly as claimed in claim 12 and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M4/366

  as layered products · CPC title

• 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