# US 12,224,424 B2 · Method of preparing positive electrode

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- Number: US 12,224,424 B2
- Document ID: US12224424B2
- Status: Granted
- Kind: B2
- Application number: 18/522,966
- Filed: 2023-11-29
- Published: 2024-03-21
- Granted: 2025-02-11
- Earliest claimed: 2018-03-14
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Chang Wan Koo; Ki Tae Kim; Sang Hoon Choy
- Web page: https://patentgrep.com/patent/US12224424B2

## CPC

- H01M 4/139: Processes of manufacture
- H01M 4/04: Processes of manufacture in general
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/043: {involving compressing or compaction}
- H01M 4/0435: {Rolling or calendering}
- H01M 4/362: {Composites}
- 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 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- 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 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0082: Organic polymers
- H01M 2300/0091: in the form of mixtures
- 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

The present invention relates to a method of preparing a positive electrode which includes forming a solid electrolyte by mixing a lithium salt and a polymer for a solid electrolyte in a dry atmosphere, forming a dry mixture by stirring after adding a conductive agent and a positive electrode active material to the solid electrolyte in a dry atmosphere, and pressing after coating a current collector with the dry mixture.

## Claims

### Claim 1

A dry positive electrode comprising:
a positive electrode collector and
a positive electrode active material layer disposed on the positive electrode collector and comprising a dry mixture,
wherein the dry positive electrode has a porosity of 3.5% to 18% and a thickness variation of 4 μm to 8 μm.

### Claim 2 (depends on 1)

The electrode of claim 1, wherein the dry mixture comprises granules, and
the granules comprise a solid electrolyte, a positive electrode active material, and a conductive agent.

### Claim 3 (depends on 2)

The electrode of claim 2, wherein the solid electrolyte comprises a polymer for a solid electrolyte and a lithium salt.

### Claim 4 (depends on 3)

The electrode of claim 3, wherein the polymer for a solid electrolyte comprises at least one selected from the group consisting of polyethylene oxide, polyacrylonitrile, carboxymethyl cellulose, polyvinylidene fluoride, and styrene-butadiene rubber.

### Claim 5 (depends on 3)

The electrode of claim 3, wherein the lithium salt comprises at least one selected from the group consisting of lithium bis(trifluoromethanesulfonyl)imide, lithium hexafluorophosphate, lithium bis(fluorosulfonyl)imide, lithium tetrafluoroborate, and lithium perchlorate.

### Claim 6 (depends on 3)

The electrode of claim 3, wherein the polymer for a solid electrolyte has a weight-average molecular weight of 20,000 g/mol to 500,000 g/mol.

### Claim 7 (depends on 6)

The electrode of claim 6, wherein the polymer for a solid electrolyte has a weight-average molecular weight of 30,000 g/mol to 200,000 g/mol.

### Claim 8 (depends on 3)

The electrode of claim 3, wherein the lithium salt has an average particle diameter (D50) of 2 μm to 50 μm.

### Claim 9 (depends on 8)

The electrode of claim 8, wherein the lithium salt has an average particle diameter (D50) of 5 μm to 20 μm.

### Claim 10 (depends on 3)

The electrode of claim 3, wherein, in the solid electrolyte, a weight ratio of the polymer for a solid electrolyte to the lithium salt is in a range of 5:95 to 50:50.

### Claim 11 (depends on 10)

The electrode of claim 10, wherein, in the solid electrolyte, a weight ratio of the polymer for a solid electrolyte to the lithium salt is in a range of 10:90 to 30:70.

### Claim 12 (depends on 2)

The electrode of claim 2, wherein the granules have an average particle diameter (D50) of 20 μm to 500 μm.

### Claim 13 (depends on 12)

The electrode of claim 12, wherein the granules have an average particle diameter (D50) of 50 μm to 200 μm.

### Claim 14 (depends on 2)

The electrode of claim 2, wherein the solid electrolyte is included in an amount of 10 wt % to 40 wt % in the dry mixture.

### Claim 15 (depends on 14)

The electrode of claim 14, wherein the solid electrolyte is included in an amount of 20 wt % to 35 wt % in the dry mixture.