# US 10,122,011 B2 · Multi layered electrode and method of manufacturing the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,122,011 B2
- Document ID: US10122011B2
- Status: Granted
- Kind: B2
- Application number: 14/485,976
- Filed: 2014-09-15
- Published: 2014-12-25
- Granted: 2018-11-06
- Earliest claimed: 2012-04-18
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Iljoon Lee; Jae Hyun Lee; Jihyun Kim
- Web page: https://patentgrep.com/patent/US10122011B2

## CPC

- H01M 4/366: {as layered products}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/364: {as mixtures}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2200/20: Pressure-sensitive devices
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- Y02E 60/10: Energy storage using batteries
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Disclosed are an electrode for secondary batteries including an electrode mixture coated on one surface or opposite surface of an electrode current collector, and a method of manufacturing the same. The electrode mixture includes an electrode mixture layer A, which is a portion close to a current collector, and an electrode mixture layer, which is a portion distant from a current collector. The electrode mixture layer A includes a mixture of two active materials, average diameters of which are different, and the electrode mixture layer B includes active materials, average diameters of which are the same.

## Claims

### Claim 1

A lithium secondary battery comprising a cathode and an anode as electrodes, wherein each of the electrodes comprises an electrode mixture layer A close to the electrode current collector and an electrode mixture layer B distant from the electrode current collector, wherein the electrode mixture layer A comprises a mixture of two active materials having different average diameters and the electrode mixture layer B comprises active materials having the same average diameters,
wherein a ratio of the electrode mixture layer A to the electrode mixture layer B is 1:9 to 3:7, based on a total thickness of the electrode mixture layers,
wherein a thickness of the electrode mixture layer A is 5 to 35 μm,
wherein the cathode comprises a spinel-structure lithium nickel manganese composite oxide (LNMO) represented by Formula 2 below as cathode active materials,
wherein the anode comprises a lithium titanium oxide (LTO) represented by Formula 4 below as anode active materials:
LixNiyMn2−yO4 (2)
wherein 0.9≤x≤1.2, and 0.4≤y≤0.5
LiaTibO4 (4)
wherein 0.5≤a≤3 and 1≤b≤2.5.

### Claim 2 (depends on 1)

The lithium secondary battery according to claim 1, wherein the active materials of the electrode mixture layer A comprise a mixture of an active material having an average diameter of 1 to 10 μm and an active material having an average diameter of 3 to 30 μm.

### Claim 3 (depends on 1)

The lithium secondary battery according to claim 1, wherein the active materials of the electrode mixture layer B comprise active materials having an average diameter of 3 to 30 μm.

### Claim 4 (depends on 1)

The lithium secondary battery according to claim 1, wherein electrode density of the electrode mixture layer A is higher than electrode density of the electrode mixture layer B.

### Claim 5 (depends on 1)

The lithium secondary battery according to claim 1, wherein the lithium nickel manganese composite oxide of Formula 2 is LiNi0.5Mn1.5O4 or LiNi0.4Mn1.6O4.

### Claim 6 (depends on 1)

The lithium secondary battery according to claim 1, wherein the lithium titanium oxide of Formula 4 is Li1.33Ti1.67O4 or LiTi2O4.

### Claim 7 (depends on 1)

The lithium secondary battery according to claim 1 as a unit battery.

### Claim 8 (depends on 7)

A battery pack comprising the battery module according to claim 7.

### Claim 9 (depends on 8)

A device comprising the battery pack according to claim 8.

### Claim 10 (depends on 9)

The device according to claim 9, wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a system for storing power.

### Claim 11 (depends on 1)

A method of manufacturing the lithium secondary battery of claim 1,
the method comprising:
(i) first coating an electrode mixture including a mixture of two active materials, average diameters of which are different, on the electrode current collector; and
(ii) second coating an electrode mixture including active materials, average diameters of which are the same, on the first coated electrode.

### Claim 12 (depends on 11)

The method of manufacturing the lithium secondary battery of claim 11 further comprising a drying process after the first coating.

### Claim 13 (depends on 11)

The method of manufacturing the lithium secondary battery of claim 11 further comprising drying and pressing processes after the second coating.