Positive electrode having current collector with carbon layer for rechargeable lithium battery and rechargeable lithium battery including same

Patent metadata

Field	Value
Publication number	US-9318746-B2
Application number	US-201213444004-A
Country	US
Kind code	B2
Filing date	Apr 11, 2012
Priority date	Jun 2, 2011
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Disclosed are a positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same, and the positive electrode includes a current collector including a carbon layer disposed on a substrate; and a positive active material layer disposed on the current collector, wherein the carbon layer has a loading level of 0.5 g/m 2 to 3 g/m 2 . The effects of the carbon layer include improving the high power characteristics and the power density by decreasing the internal resistance of an electrode, and to improve the power density by providing uniform current to the positive electrode. The carbon layer may have a thickness of about 1 μm to about 2 μm. The carbon layer may include a carbon-based material of artificial graphite, natural graphite, carbon black, acetylene black, ketjen black, denka black, or combinations thereof.

First claim

What is claimed is:

1. A positive electrode for a rechargeable lithium battery, comprising:
a current collector including a carbon layer disposed on a substrate; and
a positive active material layer disposed on the current collector,
wherein the carbon layer includes carbon-based material and binder in a weight ratio of about 70:30 to about 85:15 and has a loading level of about 1 g/m 2 to about 3 g/m 2 .

2. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the carbon layer has a thickness of about 1 μm to about 2 μm.

3. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the carbon layer comprises a carbon-based material of artificial graphite, natural graphite, carbon black, acetylene black, ketjen black, denka black, or combinations thereof.

4. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the positive active material layer comprises a positive active material that reversibly intercalates and deintercalates lithium ions.

5. The positive electrode for a rechargeable lithium battery of claim 1 , wherein the substrate comprises aluminum.

6. A rechargeable lithium battery, comprising:
a positive electrode comprising a current collector including a carbon layer disposed on a substrate wherein the carbon layer includes carbon-based material and binder in a weight ratio of about 70:30 to about 85:15; and a positive active material layer disposed on the current collector, wherein the carbon layer has a loading level of about 1 g/m 2 to about 3 g/m 2 ;
a negative electrode including a negative active material; and
an electrolyte.

7. The rechargeable lithium battery of claim 6 , wherein the rechargeable lithium battery is a high power battery capable of delivering between 30 watt-hours per kilogram to 100 kilowatt-hours per kilogram.

8. The rechargeable lithium battery of claim 6 , wherein the carbon layer has a thickness of about 1 μm to about 2 μm.

9. The rechargeable lithium battery of claim 6 , wherein the carbon layer comprises a carbon-based material of artificial graphite, natural graphite, carbon black, acetylene black, ketjen black, denka black, or combinations thereof.

10. The rechargeable lithium battery of claim 6 , wherein the positive active material layer comprises a positive active material that reversibly intercalates and deintercalates lithium ions.

11. The rechargeable lithium battery of claim 6 , wherein the substrate comprises aluminum.

Assignees

• Yu Dong-Hwan
• Kwak Gun-Ho
• Uhm In-Sung
• Shin Bo-Ra
• Samung Sdi Co Ltd
• Bosch Gmbh Robert

Inventors

• Yu Dong-Hwan
• Kwak Gun-Ho
• Uhm In-Sung
• Shin Bo-Ra

Classifications

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• H01M4/661

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

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/667 Primary

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