# US 10,873,105 B2 · Electrode for secondary battery and lithium secondary battery including same

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- Number: US 10,873,105 B2
- Document ID: US10873105B2
- Status: Granted
- Kind: B2
- Application number: 15/768,987
- Filed: 2017-06-14
- Published: 2018-10-18
- Granted: 2020-12-22
- Earliest claimed: 2016-06-14
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Ji Won Min; Hoe Jin Hah; Jong Keon Yoon; Seok Koo Kim; Yeo Kyung Yoon; Janis Doelle
- Web page: https://patentgrep.com/patent/US10873105B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- 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 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/623: {fluorinated polymers}
- H01M 10/48: Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569)
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- 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 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using 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

## Abstract

Provided are an electrode for a secondary battery and a manufacturing method thereof. According to the present invention, a secondary battery, which has high capacity and is also able to get an excellent evaluation in a nail penetration test so that stability is ensured, may be manufactured. In order to accomplish the above objectives, the present invention provides an electrode for a secondary battery which includes an electrode current collector; a first electrode active material layer formed on the electrode current collector; and a second electrode active material layer formed on the first electrode active material layer, wherein a layer composed of the electrode current collector and the first electrode active material layer has a tensile strain of 1.2% or less.

## Claims

### Claim 1

An electrode for a secondary battery comprising:
an electrode current collector;
a first electrode active material layer formed on the electrode current collector; and
a second electrode active material layer formed on the first electrode active material layer,
wherein a layer composed of the electrode current collector and the first electrode active material layer has an elongation between 0.9% and 1%,
wherein each of the first electrode active material layer and the second electrode active material layer includes a lithium-transition metal oxide as an active material, wherein the lithium-transition metal oxide is represented by Chemical Formula 1 below,
Li1+x[NiaCobMnc]1−xO2, [Chemical Formula 1]
Wherein −0.2≤x≤0.2, 0.5≤a≤0.98, 0.01≤b≤0.4, and 0.01≤c≤0.4.

### Claim 2 (depends on 1)

The electrode of claim 1, wherein the second electrode active material layer has a higher energy density per unit area than that of the first electrode active material layer.

### Claim 3 (depends on 1)

The electrode of claim 1, wherein the lithium-transition metal oxides included in the first electrode active material layer and the second electrode active material layer have the same or different compositions.

### Claim 4 (depends on 1)

The electrode of claim 1, wherein the first electrode active material layer and the second electrode active material layer each independently have an energy density per unit area of 1 to 6 mAh/cm2.

### Claim 5 (depends on 1)

The electrode of claim 1, further comprising:
a lithium ion-conductive layer laminated on the second electrode active material layer and containing a lithium ion-conductive gel swollen with a non-aqueous electrolyte; and
a heat-resistant porous layer laminated on a surface of the lithium ion-conductive layer and containing insulating metal oxide particles.

### Claim 6 (depends on 1)

A lithium secondary battery comprising the electrode of claim 1.