# US 2022/0037672 A1 · Electrode plate, electrochemical apparatus, and apparatus

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- Number: US 2022/0037672 A1
- Document ID: US20220037672A1
- Status: Published application
- Kind: A1
- Application number: 17/501,893
- Filed: 2021-10-14
- Published: 2022-02-03
- Earliest claimed: 2019-04-15
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Qingrui XUE; Jing LI; Wei LI; Zige ZHANG; Yang ZHANG; Xianwei YANG
- Web page: https://patentgrep.com/patent/US20220037672A1

## CPC

- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/621: {Binders}
- H01M 4/624: {Electric conductive fillers}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/662: {Alloys (collectors of lead alloys H01M4/685)}
- 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 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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

This application relates to an electrode plate, including a current collector and an electrode active material layer disposed on at least one surface of the current collector. The current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer, where single-side thickness D2 of the conductive layer satisfies: 30 nm≤D2≤3 μm, the support layer includes a polymer material or a polymer composite material, and thickness D1 of the support layer satisfies: 1 μm≤D1≤20 μm. The electrode active material layer includes an electrode active material, a binder, and a conductive agent, where total thickness Dtotal of the electrode active material layer satisfies: 200≥Dtotal/D1≥1, and based on total weight of the electrode active material layer, the binder content in the electrode active material layer is not less than 1 wt %.

## Claims

### Claim 1

An electrode plate, comprising a current collector and an electrode active material layer disposed on at least one surface of the current collector, wherein
the current collector comprises a support layer and a conductive layer disposed on at least one surface of the support layer, and single-side thickness D2 of the conductive layer satisfies: 30 nm≤D2≤3 μm; and the support layer comprises a polymer material or polymer composite material, and thickness D1 of the support layer satisfies: 1 μm≤D1≤20 μm;
the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, and total thickness Dtotal of the electrode active material layer satisfies: 200≥Dtotal/D1≥1; and
based on total weight of the electrode active material layer, the binder content in the electrode active material layer is not less than 1 wt %.

### Claim 2 (depends on 1)

The electrode plate according to claim 1, wherein the total thickness Dtotal of the electrode active material layer satisfies 100≥Dtotal/D1≥3.

### Claim 3 (depends on 1)

The electrode plate according to claim 1, wherein the total thickness Dtotal of the electrode active material layer satisfies 50≥Dtotal/D1≥10.

### Claim 4 (depends on 1)

The electrode plate according to claim 1, wherein the binder content in the electrode active material layer is not less than 1.5 wt %.

### Claim 5 (depends on 1)

The electrode plate according to claim 1, wherein the binder content in the electrode active material layer is not less than 2 wt %.

### Claim 6 (depends on 1)

The electrode plate according to claim 1, wherein a conductive primer layer comprising a conductive material and a binder is further disposed between the current collector and the electrode active material layer.

### Claim 7 (depends on 6)

The electrode plate according to claim 6, wherein the conductive primer layer further comprises an electrode active material; and
single-side thickness H of the conductive primer layer is 0.1 μm to 5 μm.

### Claim 8 (depends on 6)

The electrode plate according to claim 6, wherein a ratio of H to D2 is 0.5:1 to 5:1.

### Claim 9 (depends on 1)

The electrode plate according to claim 1, wherein the conductive layer is a metal conductive layer, and a material of the metal conductive layer is selected from at least one of aluminum, copper, nickel, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

### Claim 10 (depends on 1)

The electrode plate according to claim 1, wherein a material of the support layer is selected from at least one of an insulating polymer material, an insulating polymer composite material, a conductive polymer material, and a conductive polymer composite material.

### Claim 11 (depends on 1)

The electrode plate according to claim 1, wherein thickness D1 of the support layer satisfies: 1 μm≤D1≤15 μm; or
a room-temperature Young's modulus of the support layer satisfies: 20 GPa≥E≥4 GPa; or
there are cracks in the conductive layer; or
the single-side thickness D2 of the conductive layer satisfies: 300 nm≤D2≤2 μm.

### Claim 12 (depends on 1)

The electrode plate according to claim 1, wherein a protective layer is further disposed on the conductive layer, the protective layer is disposed only on one surface of the conductive layer of the current collector or disposed on two surfaces of the conductive layer of the current collector; and
thickness D3 of the protective layer satisfies: D3≤ 1/10 D2 and 1 nm≤D3≤200 nm.

### Claim 13 (depends on 12)

The electrode plate according to claim 12, wherein 10 nm≤D3≤50 nm.

### Claim 14 (depends on 1)

The electrode plate according to claim 1, wherein based on total weight of the conductive primer layer, a percentage of the conductive material by weight is 10% to 99%.

### Claim 15 (depends on 1)

The electrode plate according to claim 1, wherein an average particle size D50 of the electrode active material is 5 μm to 15 μm.

### Claim 16 (depends on 1)

The electrode plate according to claim 1, wherein viewed in a width direction of a coated surface of the electrode plate, the electrode active material layer comprises 2n+1 areas based on compacted density, and compacted density of a middle area is greater than compacted density of areas on both sides.

### Claim 17 (depends on 1)

An electrochemical apparatus, comprising a positive electrode plate, a negative electrode plate, a separator, and an electrolyte, wherein the positive electrode plate and/or the negative electrode plate are/is the electrode plate according to claim 1.

### Claim 18 (depends on 17)

An apparatus, comprising the electrochemical apparatus according to claim 17.