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

Patent metadata

Field	Value
Publication number	US-2025158153-A1
Application number	US-202418787701-A
Country	US
Kind code	A1
Filing date	Jul 29, 2024
Priority date	Nov 9, 2023
Publication date	May 15, 2025
Grant date	—

Abstract

An electrode for a rechargeable lithium battery, and an electrode assembly and a rechargeable lithium battery including the same are provided. The electrode for a rechargeable lithium battery includes a current collector including a substrate and a substrate tab extending from one end of the substrate; an electrode active material layer on the substrate; and a heat dissipating coating layer on the substrate tab.

First claim

What is claimed is:

1 . An electrode comprising:
a current collector comprising a substrate and a substrate tab extending from an end of the substrate; an electrode active material layer on the substrate; and a heat dissipating coating layer on the substrate tab and comprising a heat dissipating material, wherein the electrode is for a rechargeable lithium battery.

2 . The electrode as claimed in claim 1 , wherein:
the heat dissipating coating layer concurrently covers a side portion of the electrode active material layer and a portion of an uncoated region of the substrate, and does not cover all of the electrode active material layer; or the heat dissipating coating layer covers concurrently covers a portion of an upper portion of the electrode active material layer, a side portion of the electrode active material layer, and a portion of the uncoated region of the substrate.

3 . The electrode as claimed in claim 2 , wherein:
the heat dissipating coating layer concurrently covers the portion of the upper portion of the electrode active material layer, the side portion of the electrode active material layer, and the portion of the uncoated region of the substrate, and a width of the upper portion of the electrode active material layer covered by the heat dissipating coating layer is about 0.1 mm to about 3 mm.

4 . The electrode as claimed in claim 1 , wherein
the heat dissipating material is a conductive material.

5 . The electrode as claimed in claim 4 , wherein
the conductive material comprises a carbon-based material, a metal-based material, a conductive polymer, or a combination thereof.

6 . The electrode as claimed in claim 4 , wherein
the heat dissipating coating layer comprises a conductive material, a ceramic, and a binder.

7 . The electrode as claimed in claim 6 , wherein
the ceramic comprises pseudoboehmite, boehmite, aluminum oxide, silicon dioxide, magnesium oxide, titanium dioxide, hafnium oxide, tin oxide, cerium (IV) oxide, nickel oxide, zinc oxide, calcium oxide, zirconium oxide, yttrium oxide, silicon carbide, or a combination thereof.

8 . The electrode as claimed in claim 6 , wherein
the binder comprises a water-insoluble binder, a water-soluble binder, or a combination thereof.

9 . The electrode as claimed in claim 6 , wherein
the heat dissipating coating layer comprises, based on 100 wt % of the heat dissipating coating layer, about 0.1 wt % to about 30 wt % of the conductive material, about 30 wt % to about 95 wt % of the ceramic, and about 1 wt % to about 40 wt % of the binder.

10 . The electrode as claimed in claim 1 , wherein
a thickness of the heat dissipating coating layer is about 0.5 μm to about 40 μm.

11 . The electrode as claimed in claim 1 , wherein
the electrode active material layer comprises a first electrode active material layer; and the first electrode active material layer comprises a lithium transition metal composite oxide.

12 . The electrode as claimed in claim 11 , wherein
the electrode active material layer further comprises a second electrode active material layer between the substrate and the first electrode active material layer; and the second electrode active material layer comprises a second electrode active material comprising a lithium iron phosphate-based compound, a lithium manganese iron phosphate-based compound, or a combination thereof.

13 . The electrode as claimed in claim 12 , wherein
an area of the second electrode active material layer is larger than an area of the first electrode active material layer.

14 . The electrode as claimed in claim 13 , wherein
based on a total area of the substrate tab, an area where the second electrode active material layer covers a portion of the substrate tab is greater than about 0 area % and less than or equal to about 60 area %.

15 . The electrode as claimed in claim 13 , wherein
a width of the second electrode active material layer is about 0.1 μm to about 3 μm longer than a width of the first electrode active material layer.

16 . The electrode as claimed in claim 1 , wherein
a width of the substrate tab is about 2 μm to about 7 mm.

17 . An electrode assembly comprising
a stack in which a negative electrode, a separator, and a positive electrode are sequentially stacked, wherein at least one electrode of the negative electrode or the positive electrode is the electrode as claimed in claim 1 , and wherein the electrode assembly is for a rechargeable lithium battery.

18 . An electrode assembly comprising
a stack in which a negative electrode, a separator, and a positive electrode are sequentially stacked, wherein the positive electrode is the electrode as claimed in claim 1 , wherein the electrode assembly is for a rechargeable lithium battery, and wherein an area of the negative electrode is larger than an area of the positive electrode.

19 . A rechargeable lithium battery comprising the electrode assembly as claimed in claim 17 and an electrolyte.

20 . The electrode as claimed in claim 11 , wherein
the lithium transition metal composite oxide comprises lithium nickel-based oxide, lithium cobalt-based oxide, lithium manganese-based oxide, a lithium iron phosphate-based compound, cobalt-free lithium nickel-manganese-based oxide, or a combination thereof.

Assignees

• Samsung Sdi Co Ltd

Inventors

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

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M50/54

  Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title