IP Library › Granted Patent US 12,573,634
Granted Patent B2
US 12,573,634 · App. 17/954,896 · Granted Mar 10, 2026

Silicon-containing electrodes and methods for preparing the same

Inventors: Insun Yoon (Shelby Township, MI); Meixian Wang (Troy, MI); Ion C. Halalay (Grosse Pointe Park, MI)
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
H01M4/622H01M4/364H01M4/386H01M4/583H01M10/0525H01M50/46H01M2004/027H01M2220/20
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Quick Facts
Patent No.
US 12,573,634
App. No.
17/954,896
Granted
Mar 10, 2026
Kind
B2
Abstract

An electrochemical cell may include a first electrode that includes a positive electroactive material, a second electrode that includes a negative electroactive material and a polyacrylate binder, and a separating layer disposed between the first and second electrodes. The polyacrylate binder has a molecular weight greater than or equal to about 250,000 mol/g to less than or equal to about 500,000 mol/g. The second electrode is prepared by disposing an electrode forming slurry having a temperature greater than or equal to about 4° C. to less than or equal to about 15° C. one or near a surface of a current collector. The electrode forming slurry includes the negative electroactive material and the polyacrylate binder. The negative electroactive material can be a silicon-containing material.

Claims (30)

1 . An electrode for an electrochemical cell that cycles lithium ions, the electrode comprising:

a silicon-containing electroactive material; and

a polyacrylate binder having a molecular weight greater than or equal to about 300,000 g/mol to less than or equal to about 500,000 g/mol and formed from a monomer selected from the group consisting of:

and combinations thereof.

2 . The electrode of claim 1 , wherein the electrode comprises greater than or equal to about 0.5 wt. % to less than or equal to about 5 wt. % of the polyacrylate binder.

3 . The electrode of claim 1 , wherein the electrode further comprises greater than or equal to about 0.1 wt. % to less than or equal to about 5 wt. % of a conductive additive.

4 . The electrode of claim 1 , wherein the electrode comprises greater than or equal to about 10 wt. % to less than or equal to about 50 wt. % of the silicon-containing electroactive material.

5 . The electrode of claim 1 , wherein the electrode further comprises a carbonaceous electroactive material.

6 . The electrode of claim 5 , wherein the electrode comprises

greater than or equal to about 10 wt. % to less than or equal to about 50 wt. % of the silicon-containing electroactive material; and

greater than or equal to about 40 wt. % to less than or equal to about 80 wt. % of the carbonaceous electroactive material.

7 . An electrochemical cell that cycles lithium ions, the electrochemical cell comprising:

a first electrode comprising a positive electroactive material;

a second electrode comprising a negative electroactive material and a polyacrylate binder having a molecular weight greater than or equal to about 300,000 g/mol to less than or equal to about 500,000 g/mol and selected from the group consisting of: poly(acrylic acid) fractional neutralized with magnesium and/or calcium, poly(ethylene-co-acrylic acid), poly(ethylene-co-acrylic acid) fractional neutralized with magnesium and/or calcium, poly(acrylamide-co-acrylic acid), poly(acrylamide-co-acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, polystyrene-block-poly(acrylic acid), polystyrene-block-poly(acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, poly(N isopropylacrylamide-co-acrylic acid), poly(N-isopropylacrylamide-co-acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, and combinations thereof; and

a separating layer disposed between the first and second electrodes.

8 . The electrochemical cell of claim 7 , wherein the polyacrylate binder is a first polyacrylate binder and the first electrode further comprises a second polyacrylate binder selected from the group consisting of: poly(acrylic acid), poly(acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, poly(ethylene-co-acrylic acid), poly(ethylene-co-acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, poly(acrylamide-co-acrylic acid), poly(acrylamide-co-acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, polystyrene-block-poly(acrylic acid), polystyrene-block-poly(acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, poly(N-isopropylacrylamide-co-acrylic acid), poly(N-isopropylacrylamide-co-acrylic acid) fractional neutralized with magnesium, calcium, lithium, sodium, and/or potassium, and combinations thereof.

9 . The electrochemical cell of claim 7 , wherein the second electrode comprises greater than or equal to about 0.5 wt. % to less than or equal to about 5 wt. % of the polyacrylate binder.

10 . The electrochemical cell of claim 7 , wherein the second electrode further comprises greater than or equal to about 0.1 wt. % to less than or equal to about 5 wt. % of a conductive additive.

11 . The electrochemical cell of claim 7 , wherein the second electrode comprises greater than or equal to about 10 wt. % to less than or equal to about 50 wt. % of the negative electroactive material.

12 . The electrochemical cell of claim 7 , wherein the negative electroactive material comprises a silicon-containing electroactive material and a carbonaceous electroactive material.

13 . The electrochemical cell of claim 12 , wherein the second electrode comprises

greater than or equal to about 10 wt. % to less than or equal to about 50 wt. % of the silicon-containing electroactive material; and

greater than or equal to about 40 wt. % to less than or equal to about 80 wt. % of the carbonaceous electroactive material.

14 . A method for forming a silicon-containing electrode, the method comprising:

disposing an electrode forming slurry having a temperature greater than or equal to about 4° C. to less than or equal to about 15° C. one or near a surface of a current collector to form the electrode, the electrode forming slurry comprising a silicon-containing electroactive material and a polyacrylate binder having a molecular weight greater than or equal to about 300,000 g/mol to less than or equal to about 500,000 g/mol and formed from monomers selected from the group consisting of:

and combinations thereof.

15 . The method of claim 14 , wherein the method further comprises:

prior to disposing the electrode forming slurry, holding the electrode forming slurry at the temperature for a holding duration.

16 . The method of claim 5 , wherein the electrode forming slurry further comprises a conductive additive.

17 . The method of claim 14 , wherein the electrode forming slurry further comprises a carbonaceous electroactive material.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 28, 2022
From: YOON, INSUN; WANG, MEIXIAN; HALALAY, ION C.
To: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Reel/Frame 061245/0547 →
Continuity (1)
Related Publication 20240120486A1 · Apr 11, 2024
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