IP Library › Granted Patent US 10,700,344
Granted Patent B2
US 10,700,344 · App. 16/199,246 · Granted Jun 30, 2020

Negative electrode plate and secondary battery comprising the same

Inventors: Meng Kang (Ningde, CN); Tianquan Peng (Ningde, CN); Yuliang Shen (Ningde, CN); Jiazheng Wang (Ningde, CN); Libing He (Ningde, CN)
Assignee: Contemporary Amperex Technology Co., Limited
H01M4/133H01M4/583H01M10/0525H01M10/48H01M2004/021H01M2004/027
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Quick Facts
Patent No.
US 10,700,344
App. No.
16/199,246
Granted
Jun 30, 2020
Kind
B2
Abstract

The disclosure relates to a negative electrode plate and a secondary battery comprising the same. Specifically, the present disclosure provides a negative electrode plate comprising a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises a graphite material, and the negative electrode layer fulfills the condition: 0.45≤7.8/D50+1.9*D50/(V OI ) 2 ≤3.1, wherein D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron; V OI represents the OI value of the negative electrode layer. The negative electrode plate can allow that a secondary battery containing the same has the combination of high energy density, fast charge, and long cycle life.

Claims (35)

1. A negative electrode plate, comprising a negative electrode current collector and a negative electrode layer coated on at least one surface of the negative electrode current collector, the negative electrode layer comprising a negative electrode active material, wherein the negative electrode active material comprises a graphite material, and the negative electrode layer fulfills the condition:

0.45≤7.8/ D 50+1.9 ×D 50/( V OI ) 2 ≤3.1  formula I)

wherein

D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron,

V OI represents the OI value of the negative electrode layer.

2. The negative electrode plate according to claim 1 , wherein the negative electrode layer fulfills the condition:

0.75≤7.8/ D 50+1.9 ×D 50/( V OI ) 2 ≤2.0  formula II).

3. The negative electrode plate according to claim 1 , wherein the negative electrode active material fulfills the condition:

5.3≤ D 50×0.625+ G× 3≤14.5  formula III)

wherein D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron,

G represents the degree of graphitization of the negative electrode active material.

4. The negative electrode plate according to claim 3 , wherein the negative electrode active material fulfills the condition:

6.5≤ D 50×0.625+ G× 3≤12  formula IV).

5. The negative electrode plate according to claim 1 , wherein the negative electrode layer fulfills the condition:

0.055≤ A/B≤ 0.31  formula V)

wherein A =7.8/ D 50+1.9 ×D 50/( V OI ) 2

B=D 50×0.625+ G× 3

D50 represents a volume distribution average particle diameter of particles of the negative electrode active material in micron,

V OI represents the OI value of the negative electrode layer,

G represents the degree of graphitization of the negative electrode active material.

6. The negative electrode plate according to claim 5 , wherein the negative electrode layer fulfills the condition:

0.112≤ A/B≤ 0.26  formula VI).

7. The negative electrode plate according to claim 1 , wherein the graphite material is selected from at least one of artificial graphite and natural graphite.

8. The negative electrode plate according to claim 1 , wherein the negative electrode active material further comprises one or more of soft carbon, hard carbon, carbon fiber, mesocarbon microbead, silicon-based material, tin-based materials, and lithium titanate.

9. The negative electrode plate according to claim 1 , wherein the average particle diameter D50 of the negative electrode active material is 3-25 μm.

10. The negative electrode plate according to claim 9 , wherein the average particle diameter D50 of the negative electrode active material is 4-15 μm.

11. The negative electrode plate according to claim 1 , wherein the OI value V OI of the negative electrode layer is 1.5-100.

12. The negative electrode plate according to claim 11 , wherein the OI value V OI of the negative electrode layer is 1.5-50.

13. The negative electrode plate according to claim 1 , wherein the degree of graphitization G of the negative electrode active material is 40%-99%.

14. The negative electrode plate according to claim 13 , wherein the degree of graphitization G of the negative electrode active material is 80%-98%.

15. The negative electrode plate according to claim 1 , wherein the powder OI value G OI of the negative electrode active material is 0.5-7.

16. The negative electrode plate according to claim 15 , wherein the powder OI value G OI of the negative electrode active material is 2-4.5.

17. The negative electrode plate according to claim 1 , wherein the press density PD of the negative electrode layer is 0.8 g/cm 3 -2.0 g/cm 3 .

18. The negative electrode plate according to claim 17 , wherein the press density PD of the negative electrode layer is 1.0 g/cm 3 -1.6 g/cm 3 .

19. A secondary battery, comprising the negative electrode plate according to claim 1 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 6, 2024
From: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
To: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
Reel/Frame 068338/0723 →
Priority Claims (1)
CN 2018 1 0453001 · May 11, 2018 · national
Continuity (1)
Related Publication 20190348667A1 · Nov 14, 2019