# US 12,183,950 B2 · Separator and electrochemical device comprising same

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- Number: US 12,183,950 B2
- Document ID: US12183950B2
- Status: Granted
- Kind: B2
- Application number: 17/617,773
- Filed: 2020-06-08
- Published: 2022-07-28
- Granted: 2024-12-31
- Earliest claimed: 2019-06-14
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: So-Mi Jeong; Dong-Wook Sung
- Web page: https://patentgrep.com/patent/US12183950B2

## CPC

- H01G 11/52: Separators
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/417: Polyolefins
- H01M 50/426: Fluorocarbon polymers
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/449: having a layered structure
- H01G 9/02: Diaphragms; Separators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- Y02E 60/10: Energy storage using batteries
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- 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

A separator including a porous polymer substrate, and a porous coating layer, and an electrochemical device comprising the same. The porous coating layer includes P(VDF-TrFE-CTFE) and PVDF-CTFE as a binder polymer. The separator has a lower resistance by changing the characteristics of the binder polymer.

## Claims

### Claim 1

A separator for an electrochemical device, comprising:
a porous polymer substrate; and
a porous coating layer on at least one surface of the porous polymer substrate,
wherein the porous coating layer comprises a binder polymer,
wherein the binder polymer comprises poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene P (VDF-TrFE-CTFE) and polyvinylidene fluoride-chlorotrifluoroethylene (PVDF-CTFE),
wherein a β-phase amount of the P (VDF-TrFE-CTFE) is 0.90 or above, and
wherein a weight ratio of the P (VDF-TrFE-CTFE) to the PVDF-CTFE is 35:65 to 87:13.

### Claim 2 (depends on 1)

The separator for the electrochemical device according to claim 1, wherein the weight ratio of the P (VDF-TrFE-CTFE) to the PVDF-CTFE is 50:50 to 80:20.

### Claim 3 (depends on 1)

The separator for the electrochemical device according to claim 1, wherein the P (VDF-TrFE-CTFE) comprises 10 wt % or less of CTFE based on a total weight of the P (VDF-TrFE-CTFE).

### Claim 4 (depends on 1)

The separator for the electrochemical device according to claim 1, wherein the porous coating layer is 1 μm to 10 μm in thickness.

### Claim 5 (depends on 1)

The separator for the electrochemical device according to claim 1, wherein the porous coating layer further comprises inorganic particles.

### Claim 6 (depends on 5)

The separator for the electrochemical device according to claim 5, wherein a weight ratio of the inorganic particles to the binder polymer is 90:10 to 60:40.

### Claim 7 (depends on 5)

The separator for the electrochemical device according to claim 5, wherein the porous coating layer is 1 μm to 15 μm in thickness.

### Claim 8 (depends on 1)

The separator for the electrochemical device according to claim 1, wherein the separator has a resistance of 0.8 ohm or less, and a Lami Strength with an electrode of 50 gf/25 mm or above.

### Claim 9 (depends on 1)

An electrochemical device, comprising:
a positive electrode;
a negative electrode; and
a separator interposed between the positive electrode and the negative electrode,
wherein the separator is defined according to claim 1.

### Claim 10 (depends on 9)

The electrochemical device according to claim 9, wherein the electrochemical device is a lithium secondary battery.