Electrochemical device and electronic device containing same

Patent metadata

Field	Value
Publication number	US-12451487-B2
Application number	US-202418645924-A
Country	US
Kind code	B2
Filing date	Apr 25, 2024
Priority date	Oct 25, 2021
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

An electrochemical device includes a positive electrode, a negative electrode, a separator, and an electrolyte solution. The positive electrode includes a positive active material layer. The positive active material layer includes a positive active material represented by Formula (1): Li 1+r Ni 1-p-q M1 p M2 q O 2-s M3 s Formula (1). In Formula (1), 0<r≤1, 0<p<1, 0<q<1, 0<p+q<0.5, 0≤s<0.2, M1 and M2 each are independently at least one of Co, Mn, Fe, Ti, Al, V, Cr, Nb, Zr, La, or Y, and M3 is at least one of S, N, F, Cl, or Br. A resistance of the positive electrode is R Ω. A compaction density of the positive electrode is P g/cm 3 . A single-side areal density of the positive electrode is Q g/1540.25 mm 2 . The positive electrode satisfies Formula (2): 3.5≤R·P/Q≤30 Formula (2). The electrolyte solution includes fluoroethylene carbonate.

First claim

What is claimed is:

1. An electrochemical device, comprising: a positive electrode, a negative electrode, a separator, and an electrolyte solution; wherein the positive electrode comprises a positive active material layer, and the positive active material layer comprises a positive active material represented by Formula (1):
Li 1+r Ni 1-p-q M1 p M2 q O 2-s M3 s   Formula (1),

in Formula (1), 0<r≤1, 0<p<1, 0<q<1, 0<p+q<0.5, 0≤s<0.2, M1 and M2 each are independently at least one of Co, Mn, Fe, Ti, Al, V, Cr, Nb, Zr, La, or Y, and M3 is at least one of S, N, F, Cl, or Br;
a resistance of the positive electrode is R (in Ω), a compaction density of the positive electrode is P (in g/cm 3 ), a single-side areal density of the positive electrode is Q (in g/mm 2 ), wherein Q is calculated according to Q=1540.25×m/Ar, where m is a mass of the positive active material layer (in g), and Ar is an area of the positive active material layer (in mm 2 ), and

3.5
≤

R
·
P

/
Q

≤
30

;

the electrolyte solution comprises fluoroethylene carbonate.

2. The electrochemical device according to claim 1 , wherein

5.
≤

R
·
P

/
Q

≤
12.

3. The electrochemical device according to claim 1 , wherein R≤3.

4. The electrochemical device according to claim 1 , wherein R≤1.5.

5. The electrochemical device according to claim 1 , wherein 2.8<P≤3.6.

6. The electrochemical device according to claim 1 , wherein 0.16<Q<0.32.

7. The electrochemical device according to claim 1 , wherein 0.2<Q<0.32.

8. The electrochemical device according to claim 1 , wherein, based on a total mass of the electrolyte solution, a mass percent of fluoroethylene carbonate is greater than 0 and less than or equal to 15%.

9. The electrochemical device according to claim 1 , wherein, based on a total mass of the positive active material layer, a mass percent of the positive active material is 80% to 98%.

10. The electrochemical device according to claim 1 , wherein the positive active material exhibits a phase A and a phase B, the phase A exhibits a characteristic diffraction peak A1 of a (003) crystal plane at 17° to 19°, the phase B exhibits a characteristic diffraction peak B1 of a (001) crystal plane at 16° to 18°, and an intensity I A of the characteristic diffraction peak A1 and an intensity I B of the characteristic diffraction peak B1 satisfy

0
≤

I
A

/

I
B

<
100.

11. An electronic device, comprising an electrochemical device, wherein the electrochemical device comprises a positive electrode, a negative electrode, a separator, and an electrolyte solution; wherein the positive electrode comprises a positive active material layer, and the positive active material layer comprises a positive active material represented by Formula (1):
Li 1+r Ni 1-p-q M1 p M2 q O 2-s M3 s   Formula (1),

in Formula (1), 0<r≤1, 0<p<1, 0<q<1, 0<p+q<0.5, 0≤s<0.2, M1 and M2 each are independently at least one of Co, Mn, Fe, Ti, Al, V, Cr, Nb, Zr, La, or Y, and M3 is at least one of S, N, F, Cl, or Br;
a resistance of the positive electrode is R (in Ω), a compaction density of the positive electrode is P (in g/cm 3 ), a single-side areal density of the positive electrode is Q (in g/mm 2 ), wherein Q is calculated according to Q=1540.25×m/Ar, where m is a mass of the positive active material layer (in g), and Ar is an area of the positive active material layer (in mm 2 ), and

3.5
≤

R
·
P

/
Q

≤
30

;

the electrolyte solution comprises fluoroethylene carbonate.

12. The electronic device according to claim 11 , wherein 5.0≤R·P/Q≤12.

13. The electronic device according to claim 11 , wherein R≤3.

14. The electronic device according to claim 11 , wherein R≤1.5.

15. The electronic device according to claim 11 , wherein 2.8<P≤3.6.

16. The electronic device according to claim 11 , wherein 0.16<Q<0.32.

17. The electronic device according to claim 11 , wherein 0.2<Q<0.32.

18. The electronic device according to claim 11 , wherein based on a total mass of the electrolyte solution, a mass percent of fluoroethylene carbonate is greater than 0 and less than or equal to 15%.

19. The electronic device according to claim 11 , wherein based on a total mass of the positive active material layer, a mass percent of the positive active material is 80% to 98%.

20. The electronic device according to claim 11 , wherein the positive active material exhibits a phase A and a phase B, the phase A exhibits a characteristic diffraction peak A1 of a (003) crystal plane at 17° to 19°, the phase B exhibits a characteristic diffraction peak B1 of a (001) crystal plane at 16° to 18°, and an intensity I A of the characteristic diffraction peak A1 and an intensity I B of the characteristic diffraction peak B1 satisfy

0
≤

I
A

/

I
B

<
100.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Zhou Molin

Classifications

• H01M2300/004

  Three solvents · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M10/0525 Primary

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