Anode for secondary battery and secondary battery having the same

Patent metadata

Field	Value
Publication number	US-9755265-B2
Application number	US-201514603872-A
Country	US
Kind code	B2
Filing date	Jan 23, 2015
Priority date	Jun 2, 2011
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

The present invention relates to an anode for a secondary battery, comprising at least two anode wires which are parallel to each other and spirally twisted, each of the anode wires having an anode active material layer coated on the surface of a wire-type current collector; and a secondary battery comprising the anode. The anode of the present invention has an increased surface area to react with Li ions during a charging and discharging process, thereby improving the rate characteristics of a battery, and also release stress or pressure applied in the battery, e.g., the volume expansion of active material layers to prevent the deformation of the battery and ensure the stability thereof, thereby improving the life characteristic of the battery.

First claim

What is claimed is:

1. An anode for a secondary battery, comprising at least two anode wires which are parallel to each other and twisted, wherein each of the at least two anode wires is a wire-type current collector having an anode active material layer coated on an entire surface thereof, wherein the anode active material layer of at least one of the anode wires is porous.

2. The anode for a secondary battery according to claim 1 , wherein a twist rate of the anode wires is in the range of 0.01 to 10 mm per one twist.

3. The anode for a secondary battery according to claim 1 , wherein the wire-type current collector is made of stainless steel, aluminum, nickel, titanium, sintered carbon, copper; stainless steel surface-treated with carbon, nickel, titanium or silver; an aluminum-cadmium alloy; non-conductive polymer surface-treated with a conductive material; or a conductive polymer.

4. The anode for a secondary battery according to claim 3 , wherein the conductive material is selected from polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfur nitride, indium thin oxide (ITO), copper, silver, palladium, nickel and a mixture thereof.

5. The anode for a secondary battery according to claim 3 , wherein the conductive polymer is selected from polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfur nitride and a mixture thereof.

6. The anode for a secondary battery according to claim 1 , wherein the anode active material layer comprises an active material selected from the group consisting of a metal (Me) selected from Si, Sn, Li, Zn, Mg, Cd, Ce, Ni and Fe; an alloy containing the metal; an oxide of the metal; a composite of the metal and carbon; and a mixture thereof.

7. A secondary battery comprising a cathode, the anode according to claim 1 , and an electrolyte.

8. A cable-type secondary battery comprising:
an inner electrode including at least one anode, an anode of the at least one anode including at least two anode wires which are parallel to each other and twisted, wherein each of the at least two anode wires is a wire-type current collector having an anode active material layer coated on an entire surface thereof;
an electrolyte layer that acts as an ion channel filled to surround the inner electrode;
an outer electrode surrounding a surface of the electrolyte layer, the outer electrode having a cathode active material layer formed in the inside of a pipe-type current collector; and
a protective coating formed around an outer electrode.

9. The anode for a secondary battery according to claim 1 , wherein the at least two twisted anode wires define a space therebetween.

10. The anode for a secondary battery according to claim 1 , wherein the porous anode active material layer is formed on the surface of the corresponding current collector using an electroplating process or an anodizing process.

11. The cable-type secondary battery according to claim 8 , wherein the cathode active material layer includes lithium-containing transition metal oxide.

12. The cable-type secondary battery according to claim 8 , wherein the cathode active material layer includes a material selected from the group consisting of LiCoO2, LiNiO2, LiMnO2, LiMn2O4, Li(NiaCobMnc)O2(0<a<1, 0<b<1, 0<c<1, a+b+c=1), LiNil-yCoyO2, LiCo1-yMnyO2, LiNi1-yMnyO2(O<y<1), Li(NiaCobMnc)O4(0<a<2, 0<b<2, 0<c<2, a+b+c=2), LiMn2-zNizO4, LiMn2-zCozO4(0<z<2), LiCoPO4, and LiFePO4, or a mixture thereof.

13. The cable-type secondary battery according to claim 8 , wherein the cathode active material layer includes a sulfide, selenide, or halide of lithium-containing transition metal.

14. The secondary battery according to claim 7 , wherein the electrolyte is selected from the group consisting of a gel polymer electrolyte of polyethylene oxide (PEO), polyvinylidene fluoride (PVdF), PVdF-hexafluoropropene (HFP), polymethylmethacrylate (PMMA), polyacrylonitrile (PAN), or polyvinylacetate (PVAc); and a solid polymer electrolyte of PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES), or PVAc.

15. The secondary battery according to claim 7 , wherein the electrolyte further comprises a lithium salt.

16. The secondary battery according to claim 15 , wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and a mixture thereof.

17. The cable-type secondary battery according to claim 8 , wherein the electrolyte layer includes an electrolyte selected from the group consisting of a gel polymer electrolyte of polyethylene oxide (PEO), polyvinylidene fluoride (PVdF), PVdF-hexafluoropropene (HFP), polymethylmethacrylate (PMMA), polyacrylonitrile (PAN), or polyvinylacetate (PVAc);
and a solid polymer electrolyte of PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES), or PVAc.

18. The cable-type secondary battery according to claim 8 , wherein the electrolyte layer includes an electrolyte that further comprises a lithium salt.

19. The cable-type secondary battery according to claim 18 , wherein the lithium salt is selected from the group consisting of LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, lithium chloroborate, lower aliphatic lithium carbonate, lithium tetraphenylborate, and a mixture thereof.

20. The cable-type secondary battery according to claim 8 , wherein the protective coating is comprised of a polymer resin.

21. The cable-type secondary battery according to claim 8 , wherein the at least one anode includes at least two anodes.

22. An anode for a secondary battery, comprising at least two anode wires which are parallel to each other and intercrossed, wherein each of the at least two anode wires is a wire-type current collector having an anode active material layer coated on an entire surface thereof, wherein the anode active material layer of at least one of the anode wires is porous.

Assignees

• Lg Chemical Ltd

Inventors

• Kwon Yo-Han
• Woo Sang-Wook
• Kim Je-Young

Classifications

• H01M4/02 Primary

  Electrodes composed of, or comprising, active material · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/36

  Selection of substances as active materials, active masses, active liquids · CPC title

• H01M10/0422 Primary

  Cells or battery with cylindrical casing · CPC title

• H01M4/75

  Wires, rods or strips · CPC title