# US 2017/0288193 A1 · Lithium secondary battery and method of manufacturing the same

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- Number: US 2017/0288193 A1
- Document ID: US20170288193A1
- Status: Published application
- Kind: A1
- Application number: 15/248,020
- Filed: 2016-08-26
- Published: 2017-10-05
- Earliest claimed: 2016-04-05
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Shin Kook Kong; Sang Mok Park; Sung Hoon Lim; Sang Heon Lee; Dong Hui Kim
- Web page: https://patentgrep.com/patent/US20170288193A1

## CPC

- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 4/8668: {Binders}
- H01M 10/052: Li-accumulators
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed is a lithium secondary battery including: a positive electrode current collector comprising a positive electrode material mixture; a negative electrode current collector comprising of a negative electrode material mixture and laminated on the positive electrode current collector; a separator disposed between the positive electrode current collector and the negative electrode current collector; and a composite conductive material coated on the separator which faces the positive electrode current collector.

## Claims

### Claim 1

A lithium secondary battery comprising:
a positive electrode current collector comprising a positive electrode material mixture;
a negative electrode current collector comprising a negative electrode material mixture, is the negative electrode current collector laminated on the positive electrode current collector;
a separator disposed between the positive electrode current collector and the negative electrode current collector; and
a composite conductive material coated on the separator which faces the positive electrode current collector.

### Claim 2 (depends on 1)

The lithium secondary battery of claim 1, wherein the composite conductive material comprises:
a conductive material; and
a binder coating the composite conductive material on the separator,
wherein the composite conductive material is formed by injecting conductive material into the binder and agitating thereof.

### Claim 3 (depends on 2)

The lithium secondary battery of claim 2, wherein a slurry is coated on the positive electrode current collector and the negative electrode current collector, and
the slurry comprises:
a negative electrode slurry provided to the negative electrode current collector; and
a positive electrode slurry provided to the positive electrode current collector while being in surface-contact with the composite conductive material.

### Claim 4 (depends on 2)

The lithium secondary battery of claim 2, wherein the binder is a jelly type, and bonded by hot rolling.

### Claim 5 (depends on 2)

The lithium secondary battery of claim 2, wherein the binder is selected from the group consisting of graphene, acetylene black, carbon black, vapor-grown carbon fiber (VGCF), and combinations thereof.

### Claim 6 (depends on 2)

The lithium secondary battery of claim 2, wherein the binder comprises polyurethane and polyvinylidene difluoride (PVDF).

### Claim 7

A method of manufacturing a lithium secondary battery, the method comprising:
mixing a binder and a solvent;
forming a composite conductive material by injecting a conductive material to the binder and agitating the injected conductive material and the binder; and
coating the agitated composite conductive material on a surface of a separator.

### Claim 8 (depends on 7)

The method of claim 7, further comprising after coating agitated composite conductive material on one surface of a separator:
laminating a positive electrode current collector and a negative electrode current collector,
disposing the separator between the positive electrode current collector and the negative electrode current collector, and
disposing the composite conductive material to face the positive electrode current collector.

### Claim 9 (depends on 7)

The method of claim 7, wherein the coated composite conductive material on the surface of a separator is dried to remove a moisture of the composite conductive material.

### Claim 10 (depends on 1)

A vehicle comprising a lithium secondary battery of claim 1.