IP Library › Granted Patent US 12,407,065
Granted Patent B2
US 12,407,065 · App. 18/777,397 · Granted Sep 2, 2025

Electrochemical cells with multiple separators, and methods of producing the same

Inventors: Junzheng Chen (Concord, MA); Naoki Ota (Lexington, MA); Jeffry Disko (Lexington, MA); Anthony D'Angelo (Medford, MA)
Assignee: 24M Technologies, Inc.
H01M50/414H01M4/131H01M4/136H01M4/1391H01M4/1397H01M10/0562H01M50/403H01M50/46H01M50/491H01M2300/0051
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Quick Facts
Patent No.
US 12,407,065
App. No.
18/777,397
Granted
Sep 2, 2025
Kind
B2
Abstract

Embodiments described herein relate to electrochemical cells with multiple separators, and methods of producing the same. A method of producing an electrochemical cell can include disposing an anode material onto an anode current collector, disposing a first separator on the anode material, disposing a cathode material onto a cathode current collector, disposing a second separator onto the cathode material, and disposing the first separator on the second separator to form the electrochemical cell. The anode material and/or the cathode material can be a semi-solid electrode material including an active material, a conductive material, and a volume of liquid electrolyte. In some embodiments, less than about 10% by volume of the liquid electrolyte evaporates during the forming of the electrochemical cell. In some embodiments, the method can further include wetting the first separator and/or the second separator with an electrolyte solution prior to coupling the first separator to the second separator.

Claims (48)

1. An electrochemical cell, comprising:

a first electrode disposed on a first current collector;

a second electrode disposed on a second current collector;

a first separator disposed on the first electrode;

a second separator disposed on the second electrode;

an interlayer disposed between the first separator and the second separator, the interlayer configured to prevent the projection of dendrites through at least one of the first separator or the second separator; and

a controller configured to: monitor a voltage between the first electrode and the interlayer and cause discharge of the electrochemical cell upon detecting a decrease in the monitored voltage by a threshold voltage, the threshold voltage less than a full discharge voltage of the electrochemical cell.

2. The electrochemical cell of claim 1 , further comprising:

a first electrode tab extending from the first current collector; and

an interlayer tab extending from the interlayer, the interlayer tab extending beyond the first separator and the second separator.

3. The electrochemical cell of claim 1 , wherein the interlayer includes an electron-conductive material.

4. The electrochemical cell of claim 1 , wherein the interlayer includes a carbonaceous material.

5. The electrochemical cell of claim 4 , wherein the carbonaceous material includes at least one of graphite, hard carbon, or carbon black.

6. The electrochemical cell of claim 1 , wherein the interlayer includes a lithium-containing electrode material.

7. The electrochemical cell of claim 1 , wherein the interlayer includes at least one of LFP, LTO, or NMC.

8. The electrochemical cell of claim 1 , wherein the interlayer includes a semi-solid electrode material.

9. The electrochemical cell of claim 1 , wherein the interlayer includes a lithium intercalation material.

10. The electrochemical cell of claim 9 , wherein the lithium intercalation material includes at least one of Si, Al, Sn, Ag, W or combinations thereof.

11. The electrochemical cell of claim 1 , wherein the interlayer includes an electron-conductive powder.

12. The electrochemical cell of claim 1 , wherein the interlayer includes a first layer including a first material and a second layer including a second material different from the first material.

13. An electrochemical cell, comprising:

an anode disposed on an anode current collector;

a cathode disposed on a cathode current collector;

a first separator disposed on the anode;

a second separator disposed on the cathode;

an interlayer disposed between the anode and the cathode; and

a controller configured to; measure a voltage between the anode and the interlayer, the controller further configured to cause discharge of the electrochemical cell if the measured voltage between the anode and the interlayer decreases by a value of at least about 0.5 V and less than a full discharge voltage of the electrochemical cell.

14. The electrochemical cell of claim 13 , further comprising:

an electrode tab extending from the anode current collector; and

an interlayer tab extending from the interlayer, the interlayer tab extending beyond the first separator and the second separator.

15. The electrochemical cell of claim 13 , wherein the interlayer includes an electron-conductive material.

16. The electrochemical cell of claim 13 , wherein the controller is configured to discharge the electrochemical cell if the measured voltage decreases by a value of at least about 1 V.

17. The electrochemical cell of claim 13 , wherein the controller is configured to discharge the electrochemical cell if the measured voltage decreases by a value of at least about 1.5 V.

18. The electrochemical cell of claim 13 , wherein the interlayer includes a carbonaceous material.

19. The electrochemical cell of claim 18 , wherein the carbonaceous material includes at least one of graphite, hard carbon, or carbon black.

20. The electrochemical cell of claim 13 , wherein the interlayer includes a lithium-containing electrode material.

21. The electrochemical cell of claim 20 , wherein the interlayer includes at least one of LFP, LTO, or NMC.

22. The electrochemical cell of claim 13 , wherein the interlayer includes a semi-solid electrode material.

23. A method of operating an electrochemical cell, the electrochemical cell including an anode disposed on an anode current collector, a cathode disposed on a cathode current collector, a first separator disposed on the anode, a second separator disposed on the cathode, and an interlayer disposed between the first separator and the second separator, the method comprising:

measuring a voltage between the anode and the interlayer; and

in response to detecting a soft short circuit event between the anode and the interlayer based on the measured voltage, initiating discharge of the electrochemical cell via an external circuit, the soft short circuit event corresponding to a decrease in voltage between the anode and the interlayer by a value less than a full discharge voltage of the electrochemical cell.

24. The method of claim 23 , wherein initiating discharge of the electrochemical cell via the external circuit is in response to the measured voltage decreasing by a value of at least about 1 V.

25. The method of claim 23 , wherein initiating discharge of the electrochemical cell via the external circuit is in response to the measured voltage decreasing by a value of at least about 1.5 V.

26. The method of claim 23 , wherein measuring the voltage is via connecting a voltage measurement device to an anode tab extending from the anode and an interlayer tab extending from the interlayer.

27. The method of claim 23 , wherein the interlayer includes an electron-conductive material.

28. The method of claim 23 , wherein the interlayer includes a carbonaceous material.

29. The method of claim 28 , wherein the carbonaceous material includes at least one of graphite, hard carbon, or carbon black.

30. The method of claim 23 , wherein the interlayer includes a semi-solid electrode material.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 8, 2024
From: CHEN, JUNZHENG; OTA, NAOKI; DISKO, JEFFREY; D'ANGELO, ANTHONY
To: 24M TECHNOLOGIES, INC.
Reel/Frame 069209/0431 →
Continuity (3)
Continuation 17733658 · Apr 29, 2022
Provisional Application 63181721 · Apr 29, 2021
Related Publication 20240372213A1 · Nov 7, 2024
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