# US 10,374,203 B2 · Heat-diffusible separation film and secondary cell comprising the same

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- Number: US 10,374,203 B2
- Document ID: US10374203B2
- Status: Granted
- Kind: B2
- Application number: 15/539,408
- Filed: 2016-01-11
- Published: 2017-12-21
- Granted: 2019-08-06
- Earliest claimed: 2015-01-09
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hyun-Kyung Shin; Min-Hyung Kim; Dong-Wook Sung; In-Hyouk Sung; Ji-Eun Lee; Joo-Sung Lee
- Web page: https://patentgrep.com/patent/US10374203B2

## CPC

- H01M 10/613: Cooling or keeping cold
- H01M 10/653: characterised by electrically insulating or thermally conductive materials
- H01M 10/654: located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
- H01M 50/417: Polyolefins
- H01M 50/423: Polyamide resins
- H01M 50/431: Inorganic material
- H01M 50/437: Glass
- H01M 50/44: Fibrous material
- H01M 50/443: Particulate material
- H01M 50/446: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/451: comprising layers of only organic material and layers containing inorganic material
- H01M 50/457: comprising three or more layers
- H01M 50/463: Separators, membranes or diaphragms characterised by their shape
- H01M 50/491: Porosity
- 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 provides a heat-diffusible separator including a separator, and a porous heat transfer film formed on at least one surface of the separator.

## Claims

### Claim 1

A heat-diffusible separator, comprising:
a porous polymer substrate;
a porous coating layer disposed on at least one surface of the porous polymer substrate, wherein the porous coating layer comprises inorganic particles and a binder polymer; and
a porous heat transfer film disposed on a surface of the porous coating layer,
wherein the porous heat transfer film has a greater value of heat conductivity in a surface direction than that of heat conductivity in a thickness direction.

### Claim 2 (depends on 1)

The heat-diffusible separator of claim 1, wherein heat conductivity of the porous heat transfer film in a surface direction is 20 times greater than heat conductivity in a thickness direction.

### Claim 3 (depends on 1)

The heat-diffusible separator of claim 1, wherein the pores of the porous heat transfer film are connected with each other.

### Claim 4 (depends on 1)

The heat-diffusible separator of claim 1, wherein the pores of the porous heat transfer film are not connected to each other.

### Claim 5 (depends on 1)

The heat-diffusible separator of claim 1, wherein the porous heat transfer film comprises at least one selected from a group consisting of graphite, carbon nano-tube and carbon nano-fabric.

### Claim 6 (depends on 1)

The heat-diffusible separator of claim 1, wherein the inorganic particles having a size ranging from 0.001 μm to 10 μm.

### Claim 7 (depends on 1)

The heat-diffusible separator of claim 1, wherein the pores of the porous coating layer are interstitial volumes formed between the inorganic particles.

### Claim 8 (depends on 1)

The heat-diffusible separator of claim 1, wherein the porous heat transfer film is a perforated graphite sheet.

### Claim 9 (depends on 1)

The heat-diffusible separator of claim 1, wherein the inorganic particles have a dielectric constant of 5 or higher, or have lithium ion transfer ability.

### Claim 10 (depends on 1)

The heat-diffusible separator of claim 1, wherein a size ratio between pores of the porous polymer substrate and pores of the porous heat transfer film range from 0.005:1 to 0.05:1.

### Claim 11 (depends on 1)

The heat-diffusible separator of claim 1, wherein the porous heat transfer film comprises exfoliated graphite and a PVDF-based binder.

### Claim 12 (depends on 1)

A secondary battery comprising the heat-diffusible separator according to claim 1.