IP Library › Granted Patent US 12,401,089
Granted Patent B2
US 12,401,089 · App. 18/777,403 · Granted Aug 26, 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 12,401,089
App. No.
18/777,403
Granted
Aug 26, 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 (26)

1. A method of forming an electrochemical cell, the method comprising:

disposing a first electrode material onto a first current collector;

disposing a second electrode material onto a second current collector;

disposing a first separator on the first electrode material;

disposing a second separator on the second electrode material; and

disposing the first separator onto the second separator with an interlayer disposed therebetween, the interlayer having electron-conductive properties, the interlayer having a first layer including hard carbon and a second layer different from the first layer, the second layer including a cathode material, the first separator electrically isolating the first electrode material from the interlayer, the second separator electrically isolating the second electrode material from the interlayer.

2. The method of claim 1 , wherein the second layer includes at least one of LFP, LTO, or NMC.

3. The method of claim 1 , further comprising:

dispensing an electrolyte solution onto at least one of the first separator or the second separator.

4. The method of claim 3 , wherein the dispensing is via spraying.

5. The method of claim 1 , wherein the interlayer is configured to prevent the projection of dendrites through at least one of the first separator or the second separator during operation of the electrochemical cell.

6. The method of claim 1 , wherein the interlayer is configured to react with any dendritic material that has penetrated at least one of the first separator or the second separator such that the dendritic material dissipates, thus preventing a short circuit.

7. A method of forming an electrochemical cell, the method comprising:

disposing a first electrode material onto a first current collector;

disposing a second electrode material onto a second current collector;

disposing a first electrically insulative separator on the first electrode material;

disposing a second electrically insulative separator on the second electrode material; and

disposing the first separator onto the second separator with an interlayer disposed therebetween, the interlayer comprising a first layer including a hard carbon material and a second layer different from the first layer, the second layer including a semi-solid electrode material, the interlayer further including a current collector material between the first layer and the second layer.

8. The method of claim 7 , further comprising:

dispensing an electrolyte solution onto at least one of the first separator or the second separator.

9. The method of claim 7 , wherein the semi-solid electrode material includes at least one of LFP, LTO, or NMC.

10. The method of claim 7 , wherein the interlayer is configured to prevent the projection of dendrites through at least one of the first separator or the second separator during operation of the electrochemical cell.

11. The method of claim 1 , wherein the interlayer has a thickness between about 500 nm and about 100 μm.

12. The method of claim 1 , wherein the interlayer includes an interlayer tab extending therefrom.

13. The method of claim 7 , wherein the interlayer has a thickness between about 500 nm and about 100 μm.

14. The method of claim 7 , wherein the interlayer includes an interlayer tab extending therefrom.

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 20240372214A1 · Nov 7, 2024
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