# US 12,224,444 B2 · Electrode assembly and secondary lithium battery including the same

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- Number: US 12,224,444 B2
- Document ID: US12224444B2
- Status: Granted
- Kind: B2
- Application number: 17/681,149
- Filed: 2022-02-25
- Published: 2022-06-09
- Granted: 2025-02-11
- Earliest claimed: 2017-12-01
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Jooyong Song; In Chul Kim; Juri Kim; Hyun Min Kim
- Web page: https://patentgrep.com/patent/US12224444B2

## CPC

- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- 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 4/134: Electrodes based on metals, Si or alloys
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- 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
- 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

Disclosed are an electrode assembly, and a secondary lithium battery including the same. The electrode assembly is configured by alternately stacking two or more positive electrodes and one or more negative electrodes using a separator as a boundary therebetween, outermost positive electrodes are positioned on outermost opposite surfaces of the electrode assembly, respectively, each of the outermost positive electrodes includes a positive electrode current collector, a positive active material layer formed on one surface of the positive electrode current collector, and a non-reversible material coating layer formed on the other surface of the positive electrode current collector and including lithium oxide, and the non-reversible material coating layer is positioned on an outermost surface of the electrode assembly.

## Claims

### Claim 1

An electrode assembly configured by alternately stacking two or more positive electrodes and one or more negative electrodes with a separator as a boundary therebetween, wherein:
outermost positive electrodes are positioned on outermost opposite surfaces of the electrode assembly, respectively;
each of the outermost positive electrodes includes a positive electrode current collector, a positive active material layer disposed on one surface of the positive electrode current collector, and a non-reversible material coating layer disposed on an opposite surface of the positive electrode current collector and including lithium oxide as a non-reversible material;
the non-reversible material coating layer is positioned on an outermost surface of the electrode assembly;
the lithium oxide comprises one selected from the group consisting of Li2O2, Li2O, Li2NiO2, and mixtures thereof; and
wherein the negative electrode includes a silicon (Si)-based material as a negative active material,
wherein the non-reversible material coating layer further includes a catalyst.

### Claim 2 (depends on 1)

The electrode assembly of claim 1, wherein:
the lithium oxide comprises Li2O2 or Li2O, and
the non-reversible material coating layer does not include Li2O2 or Li2O after first charging of a battery due to a decomposition of Li2O2 or Li2O into a lithium ion and oxygen gas.

### Claim 3 (depends on 1)

The electrode assembly of claim 1, wherein:
the positive active material layer does not include the non-reversible material.

### Claim 4 (depends on 1)

The electrode assembly of claim 1, wherein:
the silicon-based material comprises one selected from the group consisting of a complex of silicon and silicon oxide; a silicon alloy; and a mixture of the complex and the silicon alloy.

### Claim 5 (depends on 1)

The electrode assembly of claim 1, wherein the non-reversible material is Li2NiO2.

### Claim 6 (depends on 1)

The electrode assembly of claim 1, wherein the positive active material layer includes a positive active material that includes a lithium transition metal oxide represented by the formula 1 or 2:
LixMyMn2-yO4-zAz (1)
wherein in formula (1),
M includes one or more elements selected from the group consisting of Al, Mg, Ni, Co, Fe, Cr, V, Ti, Cu, B, Ca, Zn, Zr, Nb, Mo, Sr, Sb, W, Ti, and Bi;
A includes one or more negative monovalent or negative bivalent ions; and
0.9≤x≤1.2, 0<y<2, and 0≤z<0.2, or
LiM′O2-yAy−xLi2MnO3-y′Ay′ (2)
wherein in formula (2),
M′ is MnaMb;
M includes one or more elements selected from the group consisting of Ni, Ti, Co, Al, Cu, Fe, Mg, B, Cr, Zr, Zn, and group 2 transition metals;
A includes one or more selected from the group consisting of negative ions of PO4, BO3, CO3, F, and NO3; and
0<x<1, 0<y≤0.02, 0<y′≤0.02, 0.5≤a≤1.0, 0≤b≤0.5, and a+b=1.

### Claim 7 (depends on 6)

The electrode assembly of claim 6, wherein the lithium transition metal oxide represented by formula 1 or 2 included in the positive active material layer is in an amount of 60 wt % to 100 wt % based on a total weight of the positive active material.

### Claim 8 (depends on 1)

The electrode assembly of claim 1, wherein the positive electrode current collector has a thickness of 3 to 500 μm.

### Claim 9 (depends on 1)

The electrode assembly of claim 1, wherein the catalyst includes a Pt catalyst.

### Claim 10 (depends on 1)

The electrode assembly of claim 1, wherein a content of the catalyst is 10 to 50 wt % based on a total weight of the non-reversible material coating layer.

### Claim 11 (depends on 1)

The electrode assembly of claim 1, wherein the non-reversible material coating layer further includes a conductive material and a binder.

### Claim 12 (depends on 11)

The electrode assembly of claim 11, wherein a content of the conductive material is 1 to 20 wt % based on a total weight of the non-reversible material coating layer.

### Claim 13 (depends on 11)

The electrode assembly of claim 11, wherein a content of the binder is 1 to 20 wt % based on a total weight of the non-reversible material coating layer.

### Claim 14 (depends on 1)

The electrode assembly of claim 1, wherein the separator comprises a non-woven fabric or an olefin-based polymer.

### Claim 15 (depends on 1)

The electrode assembly of claim 1, wherein the separator has a pore diameter of 0.01 to 10 μm.

### Claim 16 (depends on 1)

The electrode assembly of claim 1, wherein the separator has a thickness of 5 to 300 μm.

### Claim 17 (depends on 1)

A secondary lithium battery comprising:
the electrode assembly of claim 1;
a non-aqueous electrolyte which impregnates the electrode assembly; and
a battery case containing the electrode assembly and the non-aqueous electrolyte therein.

### Claim 18 (depends on 17)

A battery module comprising the secondary lithium battery of claim 17 as a unit battery.

### Claim 19 (depends on 18)

A battery pack comprising the battery module of claim 18.

### Claim 20 (depends on 19)

A device comprising the battery pack of claim 19 that is a power supply of the battery module.

### Claim 21 (depends on 20)

The device of claim 20, wherein:
the device comprises one selected from the group consisting of an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and an electric power storage system.