Current collector for battery and secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-9780380-B2
Application number	US-201414224410-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Mar 26, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

Provided is a current collector including a laminate in which a conductive substrate and an insulator are laminated, wherein the insulator is a porous insulator formed with an open pore channel penetrating through the insulator. The current collector may be used as a current collector for an electrode of a secondary battery and stably maintain capacity of the secondary battery at the time of repeating charge and discharge cycles.

First claim

What is claimed is:

1. A sodium secondary battery comprising:
an anode containing sodium;
a cathode solution;
a sodium ion conductive solid electrolyte separating the anode and the cathode solution from each other; and
a cathode current collector immersed into the cathode solution and spaced apart from the sodium ion conductive solid electrolyte,
wherein the cathode current collector comprises: a conductive substrate and an insulator laminated on a surface of the conductive substrate;
wherein the insulator is formed of a polymer and formed with a plurality of open pore channels penetrating through the insulator, the cathode solution is filled inside the open pore channels, and a portion of the surface of the conductive substrate is exposed to and directly contacts with the cathode solution by the open pore channels, and
wherein the cathode solution contains: a metal halide, which is a halide of at least one metal selected from the group consisting of transition metals and Groups 12 to 14 metals; and a solvent dissolving the metal halide.

2. The sodium secondary battery of claim 1 , wherein the cathode solution further contains a sodium halide dissolved by the solvent.

3. The sodium secondary battery of claim 2 , wherein a charge reaction of the sodium secondary battery is carried out according to the following Reaction Formula 1, and a discharge reaction of the sodium secondary battery is carried out according to the following Reaction Formula 2,
mNaX+M→mNa+MX m   (Reaction formula 1)

mNa+MX m →mNaX+M  (Reaction formula 2)

(where M is the at least one metal, X is a halogen atom, and m is a natural number of 1 to 4, MX m , is the metal halide and NaX is the sodium halide).

4. The sodium secondary battery of claim 1 , wherein the cathode solution further contains at least one plating additive selected from the group consisting of a suppressor, a leveler, and an accelerator.

5. The sodium secondary battery of claim 4 , wherein the accelerator is a sulfur-containing organic compound, the suppressor is an oxygen-containing polymer compound having a weight average molecular weight (Mw) of 1000 to 20000 g/mol, and the leveler is a nitrogen-containing organic material.

6. The sodium secondary battery of claim 1 , wherein the portion of the surface of the conductive substrate A p satisfies the following Correlation Equation 1,
0.05 A s ≦ A p ≦0.8 A s   (Correlation Equation 1)

(where A s is a total area of the surface on which the insulator is laminated).

7. The sodium secondary battery of claim 1 , wherein the open pore channels are arrayed to be spaced apart from one another.

8. The sodium secondary battery of claim 7 , wherein each of the open pore channels has a cross-sectional area of 0.01 to 80 mm 2 .

9. The sodium secondary battery of claim 1 , wherein the conductive substrate includes a plate shaped conductive substrate, and the insulator is laminated on a surface of the plate shaped conductive substrate.

10. The sodium secondary battery of claim 1 , wherein the insulator includes a hollow cylindrical shaped insulator, and the conductive substrate encloses an outer surface or an inner surface of the hollow cylindrical shaped insulator.

11. The sodium secondary battery of claim 1 , further comprising: a cylindrical metal housing containing the anode and the cathode solution,
wherein the conductive substrate is electrically connected to the metal housing.

12. The sodium secondary battery of claim 1 , wherein the sodium secondary battery is configured to have an operation temperature of 98° C. to 150° C.

Assignees

• Sk Innovation Co Ltd

Inventors

• Chae Je Hyun
• Kim Jeong Soo
• Koh Won Sang
• Lee Seung Ok
• Kim Young Shol

Classifications

• H01M4/78

  Shapes other than plane or cylindrical, e.g. helical · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/667 Primary

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