# US 2022/0045334 A1 · Resin current collector

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- Number: US 2022/0045334 A1
- Document ID: US20220045334A1
- Status: Published application
- Kind: A1
- Application number: 17/417,066
- Filed: 2020-09-03
- Published: 2022-02-10
- Earliest claimed: 2019-11-29
- Assignees: Gunze Limited; Apb Corporation
- Applicants: Gunze Limited; APB Corporation
- Inventors: Takehiro ISO; Kazuaki ONISHI; Hiroyuki NONAKA; Yasuji MARUYAMA,; Ryosuke KUSANO; Sonomi FUKUYAMA; Shun KUDOH; Yasuhiro TSUDO; Hideaki HORIE
- Web page: https://patentgrep.com/patent/US20220045334A1

## CPC

- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 4/625: {Carbon or graphite}
- 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
- 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 resin current collector is a current collector for a positive electrode of a lithium ion battery. This resin current collector includes a polyolefin resin and a conductive carbon filler. With this resin current collector, a value obtained by dividing the yield point strength in the TD (Traverse Direction) by the yield point strength in the MD (Machine Direction) is at least 0.75 and at most 1.10, and the ten-point average roughness Rz in the TD is less than 4 μm.

## Claims

### Claim 1

A resin current collector for a positive electrode of a lithium ion battery, comprising:
a polyolefin resin; and
a conductive carbon filler,
wherein a value obtained by dividing a yield point strength in a TD (Traverse Direction) by a yield point strength in a MD (Machine Direction) is at least 0.75 and at most 1.10, and
a ten-point average roughness Rz in the TD is less than 4 μm.

### Claim 2 (depends on 1)

The resin current collector according to claim 1, wherein a penetration resistance value is at most 30 Ω·cm2.

### Claim 3 (depends on 1)

The resin current collector according to claim 1, wherein a tear strength in the MD is at least 60 kN/m.

### Claim 4 (depends on 1)

The resin current collector according to claim 1,
wherein the conductive carbon filler is carbon black,
a thickness is at least 20 μm and at most 100 μm,
the ten-point average roughness Rz in the TD is at least 0.5 μm and at most 3.7 μm,
the yield point strength in the TD is at least 25 MPa,
the yield point strength in the MD is at least 29 MPa,
a value obtained by dividing the yield point strength in the TD by the yield point strength in the MD is at least 0.90 and at most 1.05, and
the tear strength in the MD is at least 70 kN/m.

### Claim 5 (depends on 1)

The resin current collector according to claim 1,
wherein the ten-point average roughness Rz in the TD is at least 0.7 μm and at most 2.5 μm, and
the yield point strength in the TD is at least 29 MPa.

### Claim 6 (depends on 2)

The resin current collector according to claim 2, wherein a tear strength in the MD is at least 60 kN/m.

### Claim 7 (depends on 2)

The resin current collector according to claim 2,
wherein the conductive carbon filler is carbon black,
a thickness is at least 20 μm and at most 100 μm,
the ten-point average roughness Rz in the TD is at least 0.5 μm and at most 3.7 μm,
the yield point strength in the TD is at least 25 MPa,
the yield point strength in the MD is at least 29 MPa,
a value obtained by dividing the yield point strength in the TD by the yield point strength in the MD is at least 0.90 and at most 1.05, and
the tear strength in the MD is at least 70 kN/m.

### Claim 8 (depends on 3)

The resin current collector according to claim 3,
wherein the conductive carbon filler is carbon black,
a thickness is at least 20 μm and at most 100 μm,
the ten-point average roughness Rz in the TD is at least 0.5 μm and at most 3.7 μm,
the yield point strength in the TD is at least 25 MPa,
the yield point strength in the MD is at least 29 MPa,
a value obtained by dividing the yield point strength in the TD by the yield point strength in the MD is at least 0.90 and at most 1.05, and
the tear strength in the MD is at least 70 kN/m.

### Claim 9 (depends on 2)

The resin current collector according to claim 2,
wherein the ten-point average roughness Rz in the TD is at least 0.7 μm and at most 2.5 μm, and
the yield point strength in the TD is at least 29 MPa.

### Claim 10 (depends on 3)

The resin current collector according to claim 3,
wherein the ten-point average roughness Rz in the TD is at least 0.7 μm and at most 2.5 μm, and
the yield point strength in the TD is at least 29 MPa.

### Claim 11 (depends on 4)

The resin current collector according to claim 4,
wherein the ten-point average roughness Rz in the TD is at least 0.7 μm and at most 2.5 μm, and
the yield point strength in the TD is at least 29 MPa.