# US 10,374,206 B2 · Lithium battery electrode and method of manufacturing the same

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- Number: US 10,374,206 B2
- Document ID: US10374206B2
- Status: Granted
- Kind: B2
- Application number: 15/617,733
- Filed: 2017-06-08
- Published: 2018-03-01
- Granted: 2019-08-06
- Earliest claimed: 2016-08-29
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Electronics and Telecommunications Research Institute
- Inventors: Ju Young Kim; Kwang Man Kim; Dong Ok Shin; Young-Gi Lee
- Web page: https://patentgrep.com/patent/US10374206B2

## CPC

- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 10/052: Li-accumulators
- H01M 50/403: Manufacturing processes of separators, membranes or diaphragms
- H01M 50/406: Moulding; Embossing; Cutting
- H01M 50/417: Polyolefins
- H01M 50/429: Natural polymers
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 50/463: Separators, membranes or diaphragms characterised by their shape
- H01M 50/489: Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- Y02E 60/10: Energy storage using batteries
- 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

A lithium battery according to the inventive concept may comprise a cathode, an anode separated from the cathode, a first separator disposed between the cathode and the anode, the first separator having first pores, a second separator disposed on the first separator, the second separator having second pores, and an electrolyte filling a gap between the cathode and the anode. Diameters of the second pores may be smaller than those of the first pores. A standard deviation of the diameters of the second pores is smaller than that of the first pores.

## Claims

### Claim 1

A lithium battery comprising:
a cathode;
an anode separated from the cathode;
a first separator disposed between the cathode and the anode, the first separator having first pores;
a second separator disposed on the first separator, the second separator having second pores; and
an electrolyte filling a gap between the cathode and the anode,
wherein diameters of the second pores are smaller than those of the first pores, and
a standard deviation of the diameters of the second pores is smaller than that of the first pores.

### Claim 2 (depends on 1)

The lithium battery of claim 1, wherein a distance between the second pores is smaller than a distance between the first pores.

### Claim 3 (depends on 1)

The lithium battery of claim 1, wherein at least some of the second pores are connected to the first pores; and
the second separator is in direct physical contact with the first separator.

### Claim 4 (depends on 1)

The lithium battery of claim 1, wherein the second separator faces the anode.

### Claim 5 (depends on 1)

The lithium battery of claim 1, further comprising a third separator that is disposed on the second separator and has third pores,
wherein diameters of the third pores are smaller than those of the first pores, and
a standard deviation of the diameters of the third pores is smaller than that of the first pores.

### Claim 6 (depends on 1)

The lithium battery of claim 1, wherein the second separator comprises a plurality of second separators, and
the plurality of second separators are disposed on the first separator.

### Claim 7

A method of manufacturing a lithium battery, comprising:
preparing a first separator having first pores;
forming a second separator having second pores, on a temporary substrate; and
transferring the second separator onto the first separator,
wherein diameters of the second pores are smaller than those of the first pores, and
a standard deviation of the diameters of the second pores is smaller than that of the first pores.

### Claim 8 (depends on 7)

The method of claim 7, wherein a distance between the second pores is smaller than a distance between the first pores.

### Claim 9 (depends on 7)

The method of claim 7, wherein at least some of the second pores are connected to the first pores.

### Claim 10 (depends on 7)

The method of claim 7, further comprising:
preparing an anode;
preparing a cathode;
placing the first and second separators between the anode and the cathode; and
forming an electrolyte to fill a gap between the anode and the cathode.

### Claim 11 (depends on 10)

The method of claim 10, wherein the second separator faces the anode.

### Claim 12 (depends on 7)

The method of claim 7, further comprising forming a third separator that is disposed on the second separator and has third pores.

### Claim 13 (depends on 12)

The method of claim 12, wherein diameters of the third pores are smaller than those of the first pores, and
a standard deviation of the diameters of the third pores is smaller than that of the first pores.

### Claim 14 (depends on 12)

The method of claim 12, wherein diameters of the third pores are smaller than those of the second pores, and
a standard deviation of the diameters of the third pores is smaller than that of the second pores.

### Claim 15 (depends on 7)

The method of claim 7, wherein the second separator comprises a plurality of second separators, each of which is independently transferred onto the first separator.

### Claim 16 (depends on 7)

The method of claim 7, wherein the forming of the second separator comprises:
coating a block copolymer onto the temporary substrate to form a block copolymer film;
applying heat or light to the block copolymer film to form a first block portion and a second block portion; and
removing the second block portion to form the second pores exposing the temporary substrate.

### Claim 17 (depends on 7)

The method of claim 7, wherein the forming of the second separator comprises:
forming a carbon structure having oxygen-containing functional groups;
thermally treating the carbon structure to form pores;
adding the carbon structure into a solvent to form a precursor solution; and
coating the temporary substrate with the precursor solution.

### Claim 18 (depends on 7)

The method of claim 7, wherein the forming of the second separator comprises:
preparing a mold having a protruding portion;
forming a preliminary separator on the protruding portion of the mold; and
transferring the preliminary separator onto the temporary substrate.