Positive electrode plate, and electrochemical apparatus and electronic apparatus containing such positive electrode plate

Patent metadata

Field	Value
Publication number	US-12308428-B2
Application number	US-202217700794-A
Country	US
Kind code	B2
Filing date	Mar 22, 2022
Priority date	Mar 26, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A positive electrode plate includes a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector, where the positive electrode active material layer includes two respective positive electrode active materials represented by chemical formula (1) and chemical formula (2): Li 1+x Na a Co 1+y Al z Mg p Ti u M v O 2+w (1), where in chemical formula (1), M includes at least one of Zr, La, or Y, −0.1<x<0.1, 0<a<0.005, −0.05<y<0.05, 0.01<z<0.05, 0.001<p<0.01, 0<u<0.005, 0<v<0.005, and −0.05<w<0.05; and Li 2+r Na s N 1+q O 2+t (2), where in chemical formula (2), −0.2<r<0.2, 0≤s≤0.05, −0.1<q<0.1, −0.05<t<0.05, and N includes at least one of Ni, Cu, Mn, Fe, or Co. Such a positive electrode plate can achieve a high specific discharge capacity of the electrochemical apparatus, thereby increasing high-temperature cycling performance and energy density of the electrochemical apparatus.

First claim

What is claimed is:

1. A positive electrode plate, comprising:
a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector; wherein,
the positive electrode active material layer comprises a first positive electrode active material and a second positive electrode active material;
the first positive electrode active material is represented by chemical formula (1) and the second positive electrode active material is represented by chemical formula (2):
Li 1+x Na a Co 1+y Al z Mg p Ti u M v O 2+w   (1),

wherein in chemical formula (1), M comprises at least one of Zr, La, or Y, −0.1<x<0.1, 0<a<0.005, −0.05<y<0.05, 0.01<z<0.05, 0.001<p<0.01, 0<u<0.005, 0<v<0.005, and −0.05<w<0.05; and
Li 2+r Na s N 1+q O 2+t   (2),

wherein in chemical formula (2), −0.2<r<0.2, 0<s≤0.05, −0.1<q<0.1, −0.05<t<0.05, and N comprises at least one of Ni, Cu, Mn, Fe, or Co; and
wherein based on a total mass of the positive electrode active material layer, a mass ratio of the first positive electrode active material to the second positive electrode active material ranges from 4:1 to 200:1.

2. The positive electrode plate according to claim 1 , wherein 3.85 g/cm 3 <P<4.35 g/cm 3 ; P is a compacted density of the positive electrode plate.

3. The positive electrode plate according to claim 1 , wherein based on a total mass of the positive electrode active material layer, a mass percentage of the first positive electrode active material ranges from 80% to 98.5%.

4. The positive electrode plate according to claim 1 , wherein Dv50 of the first positive electrode active material ranges from 3 μm to 20 μm, and Dv90 of the first positive electrode active material ranges from 12 μm to 45 μm.

5. The positive electrode plate according to claim 1 , wherein Dv50 of the second positive electrode active material ranges from 6 μm to 18 μm, and Dv90 of the second positive electrode active material ranges from 15 μm to 32 μm.

6. The positive electrode plate according to claim 1 , wherein X≥300 mAh/g, and Y/X≤40%;
wherein X is an initial specific charge capacity of the second positive electrode active material, and Y is an initial specific discharge capacity of the second positive electrode active material.

7. The positive electrode plate according to claim 1 , wherein 4.05 g/cm 3 <P<4.30 g/cm 3 ; P is a compacted density of the positive electrode plate.

8. The positive electrode plate according to claim 1 , wherein a mass ratio of the first positive electrode active material to the second positive electrode active material ranges from 9:1 to 100:1.

9. The positive electrode plate according to claim 1 , wherein based on a total mass of the positive electrode active material layer, a mass percentage of the first positive electrode active material ranges from 85% to 98.5%.

10. The positive electrode plate according to claim 1 , wherein Dv50 of the first positive electrode active material ranges from 5 μm to 16 μm, and Dv90 of the first positive electrode active material ranges from 18 μm to 40 μm.

11. The positive electrode plate according to claim 1 , wherein Dv50 of the second positive electrode active material ranges from 10 μm to 16 μm, and Dv90 of the second positive electrode active material ranges from 18 μm to 30 μm.

12. The positive electrode plate according to claim 1 , wherein the positive electrode active material layer comprises a first positive electrode active material layer and a second positive electrode active material layer, the first positive electrode active material layer comprises the first positive electrode active material, and the second positive electrode active material layer comprises the second positive electrode active material.

13. An electrochemical apparatus, comprising a positive electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer disposed on at least one surface of the positive electrode current collector; wherein,
the positive electrode active material layer comprises a first positive electrode active material and a second positive electrode active material;
the first positive electrode active material is represented by chemical formula (1) and the second positive electrode active material is represented by chemical formula (2):
Li 1+x Na a Co 1+y Al z Mg p Ti u M v O 2+w   (1),

wherein in chemical formula (1), M comprises at least one of Zr, La, or Y, −0.1<x<0.1, 0<a<0.005, −0.05 y<0.05, 0.01<z<0.05, 0.001<p<0.01, 0<u<0.005, 0<v<0.005, and −0.05<w<0.05; and
Li 2+r Na s N 1+q O 2+t   (2),

wherein in chemical formula (2), −0.2<r<0.2, 0<s<0.05, −0.1<q<<0.1, −0.05<t<0.05, and N comprises at least one of Ni, Cu, Mn, Fe, or Co; and
wherein based on a total mass of the positive electrode active material layer, a mass ratio of the first positive electrode active material to the second positive electrode active material ranges from 4:1 to 200:1.

14. The electrochemical apparatus according to claim 13 , wherein 3.85 g/cm 3 <P<4.35 g/cm 3 ; P is a compacted density of the positive electrode plate.

15. The electrochemical apparatus according to claim 13 , wherein based on a total mass of the positive electrode active material layer, a mass percentage of the first positive electrode active material ranges from 80% to 98.5%.

16. The electrochemical apparatus according to claim 13 , wherein the positive electrode active material layer comprises a first positive electrode active material layer and a second positive electrode active material layer, the first positive electrode active material layer comprises the first positive electrode active material, and the second positive electrode active material layer comprises the second positive electrode active material.

17. An electronic apparatus, comprising the electrochemical apparatus according to claim 13 .

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhou Molin

Classifications

• H01M2004/028

  Positive electrodes · 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

• H01M4/366

  as layered products · CPC title

• H01M4/364

  as mixtures · CPC title