Negative mass for lead-acid battery electrodes and lead-acid battery including same

Patent metadata

Field	Value
Publication number	US-2025233126-A1
Application number	US-202519096548-A
Country	US
Kind code	A1
Filing date	Mar 31, 2025
Priority date	Feb 23, 2021
Publication date	Jul 17, 2025
Grant date	—

Abstract

A blended expander formula for use in the preparation of lead acid battery electrodes is disclosed. The mixture comprises fine particle barium sulfate, a first oxylignin, a second oxylignin, and a carbonaceous material. A method, a negative paste, and a negative electrode including the blended expander mixture are also disclosed. A lead-acid absorbent glass mat battery is further disclosed.

First claim

We claim:

1 . A blended expander formula for use in the preparation of lead acid battery electrodes, comprising: fine particle barium sulfate, a first oxylignin having a first molecular weight, a second oxylignin having a second molecular weight which is different from the first molecular weight, and a carbonaceous material.

2 . The blended expander formula of claim 1 , wherein the first oxylignin has a molecular weight in the range of 1500 to 3500 g/mol.

3 . The blended expander formula of claim 1 , wherein the second oxylignin has a molecular weight in the range of 5000 to 15000 g/mol.

4 . The blended expander formula of claim 1 , wherein the carbonaceous material has a high specific surface area and is selected from the group consisting of carbon black, graphite, and graphene.

5 . The blended expander formula of claim 4 , wherein the carbonaceous material comprises two different carbon materials.

6 . The blended expander formula of claim 1 , comprising a range of 50-60 percent fine particle barium sulfate, a range of 10-20 percent the first oxylignin, a range of 5-15 percent the second oxylignin, and 12-22 percent the carbonaceous material.

7 . The blended expander formula of claim 1 , wherein fine barium sulfate particle size ranges from 0.2-1.1 micrometers.

8 . An active material paste for use in the negative electrode of a lead-acid absorbent glass mat battery, comprising: water, leady oxide, polymer fiber, sulfuric acid, and a blend comprising fine particle barium sulfate, a first oxylignin having a first molecular weight, a second oxylignin having a second molecular weight which is different from the first molecular weight, and a carbonaceous material.

9 . The active material paste of claim 8 , wherein the first oxylignin has a molecular weight in the range of 1500 to 3500 g/mol, and wherein the second oxylignin has a molecular weight in the range of 5000 to 15000 g/mol.

10 . The active material paste of claim 8 , wherein the carbonaceous material has a high specific surface area and is selected from the group consisting of carbon black, graphite, and graphene, and wherein the carbonaceous material comprises two different carbon materials.

11 . The active material paste of claim 8 , comprising a range of 50-60 percent fine particle barium sulfate, a range of 10-20 percent the first oxylignin, a range of 5-15 percent the second oxylignin, and 12-22 percent the carbonaceous material.

12 . The active material paste of claim 8 , wherein fine barium sulfate particle size ranges from 0.2-1.1 micrometers.

13 . The active material paste of claim 8 , wherein the active material paste has any one or more of the following properties: the density of the negative paste after mixing ranges from 4.0 to 4.8 g/cm3; an active material density ranges from 4.1 to 4.3 g/cm3 after electrochemical formation; and a formed active material the paste porosity ranges from 48% to 53% of volume.

14 . A negative electrode for use in a lead-acid absorbent glass mat battery, comprising a current collector and negative paste in contact with the current collector, the negative paste comprising water, leady oxide, polymer fiber, sulfuric acid, and a blend comprising fine particle barium sulfate, a first oxylignin having a first molecular weight, a second oxylignin having a second molecular weight which is different from the first molecular weight, and a carbonaceous material.

15 . The negative electrode of claim 14 , wherein the first oxylignin has a molecular weight in the range of 1500 to 3500 g/mol, and wherein the second oxylignin has a molecular weight in the range of 5000 to 15000 g/mol.

16 . The negative electrode of claim 14 , wherein the carbonaceous material has a high specific surface area and is selected from the group consisting of carbon black, graphite, and graphene, and wherein the carbonaceous material comprises two different carbon materials.

17 . The negative electrode of claim 14 , comprising a range of 50-60 percent fine particle barium sulfate, a range of 10-20 percent the first oxylignin, a range of 5-15 percent the second oxylignin, and 12-22 percent the carbonaceous material.

18 . The negative electrode of claim 14 , wherein fine barium sulfate particle size ranges from 0.2-1.1 micrometers.

Assignees

• Clarios Germany Gmbh & Co Kg
• Cps Tech Holdings Llc

Inventors

• Johns Frank-Thomas
• Brendel Cornelia
• Loganathan Kavi
• Spence Matthew A

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/68

  for use in lead-acid accumulators · CPC title

• H01M4/627

  Expanders for lead-acid accumulators · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M50/271

  Lids or covers for the racks or secondary casings · CPC title