Anode for lithium metal polymer secondary battery comprising surface patterned anodic current collector and method of preparing the same

• US 20060110661A1
• Filed: 09/19/2005
• Published: 05/25/2006
• Est. Priority Date: 11/25/2004
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Young Gi, Ryu, Kwang Sun, Park, Yong Joon, Hong, Yong Sik
• Granted Patent: US 7,427,455 B2
• Time in Patent Office: Days
• US Class Current: 429/233
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0565 Polymeric materials, e.g. gel-type or solid-type
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/70 characterised by shape or form
• CPC Class Codes: H01M 4/74 Meshes or woven material; Expanded metal
• CPC Class Codes: H01M 4/808 Foamed, spongy materials
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/10 Battery-grid making

Abstract

There are provided an anode for a lithium metal polymer secondary battery comprising an anodic current collector having a surface on which a plurality of recesses having a predetermined shape are formed and a method of preparing the same. The plurality of recesses are formed on a surface of the anodic current collector using a physical method or a chemical method. In a lithium metal polymer secondary battery employing the anode, oxidation/reduction of lithium and the formation of dendrite occur only in the recesses formed by surface patterning of the anodic current collector. Thus, expanding and shrinking of a battery due to a change in the thickness of the lithium anode can be prevented and cycling stability and the lifespan of a battery can be improved.

Claims

1. An anode for a lithium metal polymer secondary battery comprising an anodic current collector having a surface on which a plurality of recesses having a predetermined shape are formed.

2. The anode of claim 1, wherein the recesses have a polygonal, circular or elliptical shape.

3. The anode of claim 1, wherein the anodic current collector is composed of a metal foil or a metal foam.

4. The anode of claim 3, wherein the anodic current collector is composed of Cu or Ni.

5. A method of preparing an anode for a lithium metal polymer secondary battery comprising:

preparing an anodic current collector; and

forming a plurality of recesses on a surface of the anodic current collector.

6. The method of claim 5, wherein the anodic current collector is composed of a metal foil or a metal foam.

7. The method of claim 5, wherein the recesses are physically formed.

8. The method of claim 7, wherein the anodic current collector is pressed with a patterning frame having a plurality of protrusions to form the recesses.

9. The method of claim 5, wherein the recesses are chemically formed.

10. The method of claim 9, wherein part of a surface of the anodic current collector is etched with an etchant to form the recesses.