# US 8,465,865 B2 · Cable-type secondary battery having metal-coated polymer current collector

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- Number: US 8,465,865 B2
- Document ID: US8465865B2
- Status: Granted
- Kind: B2
- Application number: 13/399,265
- Filed: 2012-02-17
- Published: 2012-06-14
- Granted: 2013-06-18
- Earliest claimed: 2010-05-20
- Assignees: LG Chem, Ltd.
- Applicants: Yo-Han Kwon; Je-Young Kim; Ki-Tae Kim; Heon-Cheol Shin; Hyung-Man Cho; Hye-Ran Jung
- Inventors: Yo-Han Kwon; Je-Young Kim; Ki-Tae Kim; Heon-Cheol Shin; Hyung-Man Cho; Hye-Ran Jung
- Web page: https://patentgrep.com/patent/US8465865B2

## CPC

- H01M 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 4/75: Wires, rods or strips
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/058: Construction or manufacture
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A cable-type secondary battery is disclosed. The cable-type secondary battery includes electrodes, each of which includes a current collector having a horizontal cross section of a predetermined shape and an active material layer formed on the surface of the current collector. The electrodes extend in the lengthwise direction and are arranged in parallel. The current collector includes a polymer core and a metal coating layer formed on the surface of the polymer core. The use of the metal-coated polymer current collectors having high flexibility and conductivity makes the secondary battery highly flexible while maintaining the performance of the secondary battery. In addition, the cable-type secondary battery can be reduced in weight.

## Claims

### Claim 1

A cable-type secondary battery comprising:
electrodes, each electrode comprising a current collector having a horizontal cross section of a predetermined shape;
an active material layer formed on the surface of the current collector; and
an electrolyte material;
wherein the electrodes are embedded into the electrolyte material and extend in parallel in a lengthwise direction of the cable-type battery,
wherein the current collector comprises a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer.

### Claim 2 (depends on 1)

The cable-type secondary battery according to claim 1, wherein the non-conductive polymer is formed of at least one polymer selected from polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl alcohol (PVA), polyacrylate and polytetrafluoroethylene (PTFE).

### Claim 3 (depends on 1)

The cable-type secondary battery according to claim 1, wherein the metal coating layer is formed of at least one metal selected from silver, palladium, nickel and copper.

### Claim 4 (depends on 1)

The cable-type secondary battery according to claim 1, wherein the active material is in the form of particles of at least one anode active material selected from the group consisting of carbonaceous materials, LTO, and Si, Sn, Li, Zn, Mg, Cd, Ce, Ni, Fe and oxides thereof.

### Claim 5 (depends on 1)

The cable-type secondary battery according to claim 1, wherein the active material is in the form of particles of at least one cathode active material selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiCoPO4, LiFePO4, LiNiMnCoO2 and LiNi1-x-y-zCoxM1yM2zO2 (wherein M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo, and x, y and z represent the atomic fractions of the corresponding constituent elements of the oxide and satisfy the relations of 0≦x<0.5, 0≦y≦0.5, 0≦z≦0.5, x+y+z≦1).

### Claim 6

A cable-type secondary battery comprising:
a plurality of inner electrodes as anodes, each inner electrode comprising a current collector and an anode active material layer formed on the current collector, the current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and including a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer;
an electrolyte layer as an ionic path, the inner electrodes embedded in the electrolyte layer;
an outer electrode as a cathode surrounding the outer surface of the electrolyte layer and comprising a pipe-like current collector having a horizontal cross section of a predetermined shape and a cathode active material layer formed on the current collector; and
a protective cover disposed on the periphery of the outer electrode.

### Claim 7

A cable-type secondary battery comprising:
two or more inner electrodes as anodes, each inner electrode comprising a current collector and an anode active material layer formed on the current collector, the current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and including a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer;
an electrolyte layer as an ionic path, the inner electrodes embedded in the electrolyte layer;
an outer electrode as a cathode surrounding the outer surface of the electrolyte layer and comprising a pipe-like current collector and a cathode active material layer formed on the current collector; and
a protective cover disposed on the periphery of the outer electrode.

### Claim 8

A cable-type secondary battery comprising:
two or more inner electrodes as anodes arranged in parallel, each inner electrode comprising a current collector and an anode active material layer formed on the current collector and having an electrolyte layer thereon serving as an ion channel, the current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and comprising a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer;
an outer electrode as a cathode comprising a pipe-like current collector and a cathode active material layer, the inner electrodes embedded in the cathode active material layer; and
a protective cover disposed on the periphery of the outer electrode.

### Claim 9

A cable-type secondary battery comprising:
two or more inner electrodes as cathodes arranged in parallel, each inner electrode comprising a current collector and a cathode active material layer formed on the current collector and having an electrolyte layer thereon serving as an ion channel, the current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and comprising a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer;
an outer electrode as an anode comprising a pipe-like current collector and an anode active material layer, the inner electrodes embedded in the anode active material layer; and
a protective cover disposed on the periphery of the outer electrode.

### Claim 10

A cable-type secondary battery comprising:
one or more anodes, each anode comprising an anode a current collector and an anode active material layer formed on the anode current collector, the anode current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and comprising a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer, a first electrolyte layer as an ionic path being formed on the outer surface of the anode active material layer;
one or more cathodes, each cathode comprising a cathode current collector and a cathode active material layer formed on the cathode current collector, the cathode current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and comprising a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer;
a second electrolyte layer as an ionic path allowing the anodes and the cathodes to be arranged in parallel, the anodes and the cathodes embedded in the second electrolyte layer; and
a protective cover disposed on the periphery of the second electrolyte layer.

### Claim 11

A cable-type secondary battery comprising:
one or more cathodes, each cathode comprising a cathode current collector and a cathode active material layer formed on the cathode current collector, the cathode current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and comprising a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer, a first electrolyte layer as an ionic path being formed on the outer surface of the cathode active material layer;
one or more anodes, each anode comprising an anode current collector and an anode active material layer formed on the anode current collector, the anode current collector having a horizontal cross section of a predetermined shape, extending in lengthwise direction and comprising a non-conductive polymer and a metal coating layer formed on the surface of the non-conductive polymer;
a second electrolyte layer as an ionic path allowing the anodes and the cathodes to be arranged in parallel, the anodes and the cathodes embedded in the second electrolyte layer; and
a protective cover disposed on the periphery of the second electrolyte layer.

### Claim 12 (depends on 6)

The cable-type secondary battery according to claim 6, wherein the electrolyte layer is formed of a gel-type solid electrolyte using PEO, PVdF, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc).

### Claim 13 (depends on 6)

The cable-type secondary battery according to claim 6, wherein the electrolyte layer further comprises a lithium salt.

### Claim 14 (depends on 13)

The cable-type secondary battery according to claim 13, wherein the lithium salt is selected from LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2)2NLi, chloroborane lithium, lithium lower aliphatic carboxylates, lithium tetraphenylborate, and mixtures of two or more thereof.

### Claim 15 (depends on 7)

The cable-type secondary battery according to claim 7, wherein the electrolyte layer is formed of a gel-type solid electrolyte using PEO, PVdF, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc).

### Claim 16 (depends on 8)

The cable-type secondary battery according to claim 8, wherein the electrolyte layer is formed of a gel-type solid electrolyte using PEO, PVdF, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc).

### Claim 17 (depends on 9)

The cable-type secondary battery according to claim 9, wherein the electrolyte layer is formed of a gel-type solid electrolyte using PEO, PVdF, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc).

### Claim 18 (depends on 10)

The cable-type secondary battery according to claim 10, wherein the first electrolyte layer and the second electrolyte layer are each independently formed of a gel-type solid electrolyte using PEO, PVdF, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc).

### Claim 19 (depends on 11)

The cable-type secondary battery according to claim 11, wherein the first electrolyte layer and the second electrolyte layer are each independently formed of a gel-type solid electrolyte using PEO, PVdF, PMMA, PAN or PVAC, or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethyleneimine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc).