Electrode with perforated current collector and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10418638-B2
Application number	US-201715649818-A
Country	US
Kind code	B2
Filing date	Jul 14, 2017
Priority date	Jul 18, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

Disclosed are an electrode including a perforated current collector, and a lithium secondary battery including the same, and according to the present disclosure, precipitation and elimination reactions of lithium metal are induced inside a perforation of a negative electrode current collector, and therefore, volume expansion of a cell is suppressed and battery performance is enhanced therefrom.

First claim

What is claimed is:

1. An electrode for a lithium secondary battery comprising:
a pair of negative electrode current collectors having a plurality of perforations; and
a lithium metal layer disposed between the pair of negative electrode current collectors,
wherein the lithium metal layer comprises a first surface and a second surface opposite the first surface, the first surface directly contacting a surface of a first negative electrode current collector of the pair of negative electrode current collectors and the second surface directly contacting a surface of a second negative current collector of the pair of negative current collectors.

2. The electrode for a lithium secondary battery of claim 1 , further comprising an insulation layer disposed on the negative electrode current collector and having a plurality of perforations funneled to the perforations.

3. The electrode for a lithium secondary battery of claim 1 , wherein the perforation has a circular, oval or polygonal shape.

4. The electrode for a lithium secondary battery of claim 1 , wherein an aperture ratio caused by the perforations of the negative electrode current collector is from 20% to 80%.

5. The electrode for a lithium secondary battery of claim 1 , wherein the perforation of the negative electrode current collector is a circle having a diameter from 0.1 mm to 1.0 mm.

6. The electrode for a lithium secondary battery of claim 1 , wherein the perforation of the negative electrode current collector is a polygon having a longest distance of an inner side surface from 0.1 mm to 1.0 mm.

7. The electrode for a lithium secondary battery of claim 1 , wherein space between the perforations of the negative electrode current collector is from 0.1 mm to 1.0 mm.

8. The electrode for a lithium secondary battery of claim 1 , wherein the negative electrode current collector is selected from the group consisting of copper, aluminum, stainless steel, zinc, titanium, silver, palladium, nickel, iron, chromium, an alloy thereof and a combination thereof.

9. The electrode for a lithium secondary battery of claim 1 , wherein a thickness of the negative electrode current collector is from 3 μm to 500 μm.

10. The electrode for a lithium secondary battery of claim 2 , wherein the insulation layer is one or more types selected from among styrene-butadiene series rubber, carboxymethylcellulose, polytetrafluoroethylene, polyethylene, polypropylene, an ethylene propylene copolymer, polybutadiene, butyl rubber, fluoro rubber, polyethylene oxide, polyvinyl pyrrolidone, polyepichlorohydrin, polyphosphazene, polyacrylonitrile, polystyrene, an ethylene propylene diene copolymer, polyvinyl pyridine, chlorosulfonated polyethylene, latex, a polyester resin, an acrylic resin, a phenol resin, an epoxy resin, polyvinyl alcohol, hydroxypropylcellulose and a combination thereof.

11. The electrode for a lithium secondary battery of claim 2 , wherein a thickness of the insulation layer is from 0.01 μm to 50 μm.

12. A lithium secondary battery comprising:
a negative electrode;
a positive electrode;
a separator provided therebetween; and
an electrolyte,
wherein the negative electrode is the electrode of claim 1 .

13. The electrode for a lithium secondary battery of claim 1 , wherein the lithium metal layer includes Li; and a lithium-containing metal compound selected from the group consisting of S, P, O, Cl, Se, F, Br, I and a combination thereof.

14. The electrode for a lithium secondary battery of claim 13 , wherein the lithium metal layer further includes an element selected from the group consisting of Ni, Co, Cu, Zn, Ga, Ge, Si, Al, Fe, V, Mn, Ti, Mo, Cr, Nb, Pt and a combination thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Woo Kyung Hwa

Classifications

• H01M4/808

  Foamed, spongy materials · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/661

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

• H01M4/667

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

• H01M4/742 Primary

  perforated material · CPC title