# US 10,770,731 B2 · Positive electrode current collector and preparation method and use thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,770,731 B2
- Document ID: US10770731B2
- Status: Granted
- Kind: B2
- Application number: 16/052,603
- Filed: 2018-08-01
- Published: 2020-02-06
- Granted: 2020-09-08
- Earliest claimed: 2018-08-01
- Applicants: Chongqing Jinmei New Material Technology Co., Ltd.
- Inventors: Zuoyi Yan; Wenqing Liu
- Web page: https://patentgrep.com/patent/US10770731B2

## CPC

- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/0423: {Physical vapour deposition}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/664: {Ceramic materials}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 2004/028: {Positive electrodes}
- 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 provides a positive electrode current collector, and a preparation method and use thereof. The positive electrode current collector is of a multilayered structure and comprises a plastic thin film, wherein the upper and lower surfaces of the plastic thin film are coated with a bonding force enhancement layer, an aluminum metal coating layer and an anti-oxidization layer in sequence. The preparation method comprises the steps of coating the bonding force enhancement layer, the aluminum metal coating layer and the anti-oxidization layer in sequence through an evaporation film-coating process. Use of the positive electrode current collector in a lithium ion battery is further provided. By virtue of the positive electrode current collector according to the present invention, light weight and improved energy density of the battery is realized, and the aluminum coating layer is not easily peeled off, and insusceptible to oxidization.

## Claims

### Claim 1

A positive electrode current collector, having a multilayered structure and comprising a plastic thin film, wherein upper and lower surfaces of the plastic thin film are coated with a bonding force enhancement layer, an aluminum metal coating layer and an anti-oxidization layer in sequence, wherein the plastic thin film is OPP, PI, PET, CPP, or PVC.

### Claim 2 (depends on 1)

The positive electrode current collector according to claim 1, wherein the plastic thin film has a thickness of 2-12 μm.

### Claim 3 (depends on 1)

The positive electrode current collector according to claim 1, wherein the bonding force enhancement layer is a metallic coating formed by Ni.

### Claim 4 (depends on 1)

The positive electrode current collector according to claim 1, wherein the bonding force enhancement layer is a nonmetallic coating formed by SiC, Si3N4, or Al2O3.

### Claim 5 (depends on 1)

The positive electrode current collector according to claim 1, wherein the bonding force enhancement layer has a thickness of 10-100 nm.

### Claim 6 (depends on 1)

The positive electrode current collector according to claim 1, wherein the aluminum metal coating layer has a thickness of 100-2000 nm.

### Claim 7 (depends on 1)

The positive electrode current collector according to claim 1, wherein the anti-oxidization layer is a dense metallic layer formed by Ni; and when the anti-oxidization layer is a nonmetallic layer, the nonmetal is Al2O3, Si3N4 or SiC.

### Claim 8 (depends on 1)

The positive electrode current collector according to claim 1, wherein the anti-oxidization layer is a dense nonmetallic layer formed by Al2O3, Si3N4 or SiC.

### Claim 9 (depends on 1)

The positive electrode current collector according to claim 1, wherein the anti-oxidization layer has a thickness of 10-100 nm.

### Claim 10

A method for preparing a positive electrode current collector having a multilayered structure and comprising a plastic thin film wherein upper and lower surfaces of the plastic thin film are coated with a bonding force enhancement layer, an aluminum metal coating layer and an anti-oxidization layer in sequence, comprising the steps of:
S1: treating surfaces of a plastic thin film to be coated with corona, then feeding the plastic thin film which is in a wound form to a vacuum chamber in a double-side roundtrip electron beam evaporation coating machine, sealing the vacuum chamber, evacuating gradually to a vacuum level of 3×10−3 to 6×10−3 Pa, bombarding evaporation material Al2O3 with accelerated electrons by using an electron gun, and adjusting unwinding speed, rewinding speed and evaporation rate, with the Al2O3 absorbing heat and being vaporized, to form a layer of Al2O3 coating, that is, the bonding force enhancement layer, on the surfaces of the moving thin film;
S2: feeding the thin film coated with Al2O3 obtained in step S1 to the vacuum chamber of the double-side roundtrip electron beam evaporation coating machine, sealing the vacuum chamber, evacuating gradually to a vacuum level of 4×10−2 to 6×10−2 Pa, heating an evaporation device to 1300° C.-1400° C., then delivering aluminum to the evaporation device, and adjusting unwinding speed, rewinding speed, and evaporation rate, with the aluminum being persistently melted and evaporated in the evaporation device, to form a layer of aluminum coating, that is, the aluminum metal coating layer, on the surfaces of the moving thin film; and
S3: feeding the thin film coated with aluminum obtained in S2 to the vacuum chamber of the coating machine, sealing the vacuum chamber, evacuating gradually to a vacuum level of 3×10−3 to 6×10−3 Pa, bombarding evaporation material Al2O3 with accelerated electrons by using an electron gun, and adjusting unwinding speed, rewinding speed and evaporation rate, with the Al2O3 absorbing heat and being vaporized, to form a layer of Al2O3 coating, that is, the anti-oxidization layer, on the surfaces of the moving thin film.

### Claim 11 (depends on 1)

A battery comprising the positive electrode current collector according to claim 1.