# US 12,002,961 B2 · Electrode for lithium secondary battery and lithium secondary battery comprising same

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- Number: US 12,002,961 B2
- Document ID: US12002961B2
- Status: Granted
- Kind: B2
- Application number: 17/266,802
- Filed: 2019-07-31
- Published: 2021-11-04
- Granted: 2024-06-04
- Earliest claimed: 2018-08-08
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Jun-Soo Park; Bum-Young Jung
- Web page: https://patentgrep.com/patent/US12002961B2

## CPC

- H01M 4/623: {fluorinated polymers}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/622: {being polymers}
- 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 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- 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 disclosure relates to an electrode for a lithium secondary battery which includes: an electrode current collector; a primer coating layer disposed on at least one surface of the electrode current collector and including a binder and a conductive material; and an electrode active material layer disposed on the primer coating layer, wherein the binder includes poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) containing vinylidene fluoride (VDF)-derived repeating units and hexafluoropropylene (HFP)-derived repeating units, the content of HFP-derived repeating units in PVDF-HFP is 2-13 wt %, and the primer coating layer has a thickness of 0.8-10 μm.

## Claims

### Claim 1

An electrode for a lithium secondary battery comprising:
an electrode current collector; a primer coating layer disposed on at least one surface of the electrode current collector and comprising a binder and a conductive material; and an electrode active material layer disposed on the primer coating layer,
wherein the binder comprises poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) containing vinylidene fluoride (VDF)-derived repeating units and hexafluoropropylene (HFP)-derived repeating units,
a content of the HFP-derived repeating units in PVDF-HFP is 2-13 wt %, and
the primer coating layer has a thickness of 0.8-5 μm,
wherein the primer coating layer comprises the binder in an amount of 26-80 parts by weight based on 100 parts by weight of the conductive material.

### Claim 2 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the primer coating layer comprises the binder in an amount of 35-80 parts by weight based on 100 parts by weight of the conductive material.

### Claim 3 (depends on 2)

The electrode for a lithium secondary battery according to claim 2, wherein the primer coating layer comprises the binder in an amount of 35-65 parts by weight based on 100 parts by weight of the conductive material.

### Claim 4 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the content of HFP-derived repeating units in PVDF-HFP is 3-10 wt %.

### Claim 5 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the primer coating layer has a thickness of 1-2 μm.

### Claim 6 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the primer coating layer has a thickness corresponding to 0.01-0.05 times of a thickness of the electrode active material layer.

### Claim 7 (depends on 6)

The electrode for a lithium secondary battery according to claim 6, wherein the primer coating layer has a thickness corresponding to 0.01-0.03 times of a thickness of the electrode active material layer.

### Claim 8 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the binder includes PVDF-HFP in an amount of 50 wt % or more based on 100 wt % of the binder.

### Claim 9 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the electrode active material layer comprises an electrode binder, and the electrode binder comprises PVDF-HFP in an amount of 5 wt % or less based on 100 wt % of the electrode binder.

### Claim 10 (depends on 1)

A lithium secondary battery comprising a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode, wherein the positive electrode or the negative electrode is the electrode according to claim 1.

### Claim 11 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the primer coating layer comprises the binder in an amount of 40-50 parts by weight based on 100 parts by weight of the conductive material.

### Claim 12 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the content of HFP-derived repeating units in PVDF-HFP is 3-7 wt %.

### Claim 13 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the electrode active material layer comprises an electrode binder including polyvinylidene fluoride (PVDF).

### Claim 14 (depends on 1)

The electrode for a lithium secondary battery according to claim 1, wherein the primer coating layer has a thickness of 1-1.5 μm.