ANODE FOR CABLE-TYPE SECONDARY BATTERY AND CABLE-TYPE SECONDARY BATTERY INCLUDING THE ANODE

• US 20140284215A1
• Filed: 06/06/2014
• Published: 09/25/2014
• Est. Priority Date: 06/28/2010
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: KWON, Yo-Han, KIM, Je-Young, KIM, Ki-Tae, SHIN, Heon-Cheol, CHO, Hyung-Man, JUNG, Hye-Ran
• Granted Patent: US 9,406,926 B2
• Time in Patent Office: Days
• US Class Current: 205/59
• CPC Class Codes: C25D 3/30 of tin
• CPC Class Codes: C25D 7/0607 Wires
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 4/0442 Anodisation, Oxidation electrolytic coating by anodisation C25D9/00
• CPC Class Codes: H01M 4/0452 from solutions
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/661 Metal or alloys, e.g. alloy coatings H01M4/669 take precedence
• CPC Class Codes: H01M 4/667 in the form of layers, e.g. coatings
• CPC Class Codes: H01M 4/75 Wires, rods or strips
• CPC Class Codes: H01M 4/78 Shapes other than plane or cylindrical, e.g. helical
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed is an anode for a lithium secondary battery. The anode includes a current collector in the form of a wire and a porous anode active material layer coated to surround the surface of the current collector. The three-dimensional porous structure of the active material layer increases the surface area of the anode. Accordingly, the mobility of lithium ions through the anode is improved, achieving superior battery performance. In addition, the porous structure allows the anode to relieve internal stress and pressure, such as swelling, occurring during charge and discharge of a battery, ensuring high stability of the battery while preventing deformation of the battery. These advantages make the anode suitable for use in a cable-type secondary battery. Further disclosed is a lithium secondary battery including the anode.

Claims

1. A method for producing an anode for a cable-type secondary battery, the method comprising:

(S1) preparing an aqueous solution of an anode active material; and

(S2) dipping a core as a current collector having a horizontal cross section in a predetermined shape and extending in the lengthwise direction in the aqueous solution of the anode active material, and applying an electric current to the core to form a porous shell on the outer surface of the core.

2. The method according to claim 1, wherein the anode active material comprises at least one element or compound selected from the group consisting of Si, Sn, Li, Zn, Mg, Cd, Ce, Ni, Fe and oxides thereof.

3. The method according to claim 1, wherein the current collector is stainless steel, aluminum, titanium, silver, palladium, nickel, copper, or stainless steel surface treated with titanium, silver, palladium, nickel or copper.

4. The method according to claim 1, wherein the current collector comprises a polymer core and a metal coating layer formed on the surface of the polymer core.

5. The method according to claim 4, wherein the polymer core is made of at least one polymer selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, poly(sulfur nitride), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl alcohol (PVA), polyacrylate and polytetrafluoroethylene (PTFE).

6. The method according to claim 4, wherein the metal coating layer is formed of at least one metal selected from silver, palladium, nickel and copper.

7. The method according to claim 1, wherein the porous shell has a pore size of 10 to 150 μ

m.

8. The method according to claim 1, wherein the porous shell has a porosity of 60 to 95%.

9. The method according to claim 1, wherein the porous shell has a surface area of 8×

10⁴ to 5×

10⁵ cm²/g.