Electrode plate, electrochemical apparatus, and apparatus

Patent metadata

Field	Value
Publication number	US-12315936-B2
Application number	US-202117501893-A
Country	US
Kind code	B2
Filing date	Oct 14, 2021
Priority date	Apr 15, 2019
Publication date	May 27, 2025
Grant date	May 27, 2025

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 D total of the electrode active material layer satisfies: 200≥D total /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 %.

First claim

What is claimed is:

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 along a thickness direction of the current collector satisfies: 30 nm≤D2≤3 μm; and the support layer comprises a polymer material or polymer composite material, and a thickness D1 of the support layer along a thickness direction of the current collector satisfies: 1 μm≤D1≤20 μm;
the electrode active material layer comprises an electrode active material, a binder, and a conductive agent, and a total thickness D total of the electrode active material layer satisfies: 200≥D total /D1≥1;
based on total weight of the electrode active material layer, a binder content of the binder in the electrode active material layer is not less than 1 wt %; and
the electrode plate has a length direction, which is a main dimension direction with a larger magnitude, and a width direction, which is a secondary dimension direction with a smaller magnitude, the length direction and the width direction are perpendicular to the thickness direction of the current collector,
when viewed in the width direction of a coated surface of the electrode plate, the electrode active material layer comprises 2n+1 areas based on compacted density, and a compacted density of a middle area is greater than a compacted density of the areas on both sides relative to the middle area.

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

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

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

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

6. 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.

7. 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.

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

9. 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.

10. 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.

11. 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.

12. 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.

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

14. The electrode plate according to claim 6 , wherein based on total weight of the conductive primer layer, a percentage of the conductive material by weight is 10% to 99%.

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

16. 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 .

17. An apparatus, comprising the electrochemical apparatus according to claim 16 .

18. The electrode plate according to claim 1 , wherein the compacted density of the middle area is greater than the compacted density of areas on both sides by 5% to 30% of the compacted density of the middle area.

19. The electrode plate according to claim 1 , wherein a ratio of a width of the middle area to a sum of a width of each one of the areas is 30% to 70%.

20. The electrode plate according to claim 1 , wherein the compacted density of the middle area is the highest among all of the 2n+1 areas, and the compacted density of the areas on both sides gradually decreases from middle to edge along the width direction of the electrode plate.

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Xue Qingrui
• Li Jing
• Li Wei
• Zhang Zige
• Zhang Yang
• Yang Xianwei

Classifications

• H01M4/667 Primary

  in the form of layers, e.g. coatings · CPC title

• H01M4/662

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title