Negative electrode for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-10205171-B2
Application number	US-201514919989-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Oct 30, 2014
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A negative electrode for a rechargeable lithium battery includes a negative current collector; a negative active material layer on the negative current collector; and a negative electrode tab on an uncoated region of the negative current collector, the uncoated region not having a negative active material coated thereon, wherein the negative electrode tab has a three-layered structure of a nickel layer-copper layer-nickel layer. A rechargeable lithium battery includes the negative electrode.

First claim

What is claimed is:

1. A negative electrode for a rechargeable lithium battery, the negative electrode comprising:
a negative current collector;
a negative active material layer on the negative current collector; and
a negative electrode tab on an uncoated region of the negative current collector, the uncoated region not having a negative active material coated thereon,
wherein the negative electrode tab has a three-layered structure of a nickel layer-copper layer-nickel layer, wherein the negative electrode tab includes about 60 wt % to about 80 wt % of nickel and about 20 wt % to about 40 wt % of copper.

2. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative electrode tab is a clad negative electrode tab.

3. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative electrode tab is about 0.09 mm to about 0.11 mm thick.

4. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein a combined thickness of nickel layers is about 1.5 times to about 2.5 times a thickness of the copper layer.

5. The negative electrode for a rechargeable lithium battery as claimed in claim 1 , wherein the negative electrode tab is about 30 mm to about 40 mm long.

6. A rechargeable lithium battery, comprising
a battery case;
an electrode assembly inside the battery case, the electrode assembly including an electrolyte solution, a negative electrode, a positive electrode and a separator between the negative electrode and the positive electrode, wherein the negative electrode includes a negative current collector, a negative active material layer on the negative current collector, a negative current collector including a negative electrode uncoated region not having an active material coated thereon, and a negative electrode tab on the negative electrode uncoated region; and
a sealing member sealing the battery case,
wherein the negative electrode tab has a three-layered structure of a nickel layer-copper layer-nickel layer, wherein the negative electrode tab includes about 60 wt % to about 80 wt % of nickel and about 20 wt % to about 40 wt % of copper.

7. The rechargeable lithium battery as claimed in claim 6 , wherein the negative electrode tab is a clad negative electrode tab.

8. The rechargeable lithium battery as claimed in claim 6 , exhibiting a resistance of about 12.0 mΩ to about 20.0 mΩ.

9. The rechargeable lithium battery as claimed in claim 6 , wherein the negative electrode tab is about 0.09 mm to about 0.11 mm thick.

10. The rechargeable lithium battery as claimed in claim 6 , wherein a combined thickness of the nickel layers is about 1.5 times to about 2.5 times a thickness of the copper layer.

11. The rechargeable lithium battery as claimed in claim 6 , wherein the negative electrode tab is about 30 mm to about 40 mm long.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Bak Hyo-Rim

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/667 Primary

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

• H01M4/70

  characterised by shape or form · CPC title

• H01M2004/027

  Negative electrodes · CPC title