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

Patent metadata

Field	Value
Publication number	US-2021336249-A1
Application number	US-201917270782-A
Country	US
Kind code	A1
Filing date	Aug 30, 2019
Priority date	Aug 31, 2018
Publication date	Oct 28, 2021
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

1 - 14 . (canceled)

15 . A method of making a negative electrode for a lead acid battery comprising the steps of: pre-blending the expander either wet or dry, preparing a paste, applying paste to the grid, curing the paste on the grid.

16 . (canceled)

17 . 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.

18 . The blended expander formula of claim 17 , wherein the first oxylignin has a molecular weight in the range of 1500 to 3500 g/mol.

19 . The blended expander formula of claim 17 , wherein the second oxylignin has a molecular weight in the range of 5000 to 15000 g/mol.

20 . The blended expander formula of claim 17 , wherein the carbonaceous material has a high specific surface area and is selected from the group consisting of carbon black, graphite, and graphene.

21 . The blended expander formula of claim 20 , wherein the carbonaceous material comprises two different carbon materials.

22 . The blended expander formula of claim 17 , 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.

23 . The blended expander formula of claim 17 , wherein fine barium sulfate particle size ranges from 0.2-1.1 micrometers.

24 . (canceled)

25 . (canceled)

26 . 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.

27 . The active material paste of claim 26 , 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.

28 . (canceled)

29 . The active material paste of claim 26 , 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.

30 . (canceled)

31 . The active material paste of claim 26 , 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.

32 . The active material paste of claim 26 , wherein fine barium sulfate particle size ranges from 0.2-1.1 micrometers.

33 . The active material paste of claim 26 , 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.

34 . 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.

35 . The negative electrode of claim 34 , 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.

36 . (canceled)

37 . The negative electrode of claim 34 , 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.

38 . (canceled)

39 . The negative electrode of claim 34 , 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.

40 . The negative electrode of claim 34 , wherein fine barium sulfate particle size ranges from 0.2-1.1 micrometers.

41 . A lead-acid battery comprising:
a container with a cover, the container including one or more compartments; one or more cell elements in the one or more compartments, the one or more cell elements comprising: a positive electrode, the positive electrode having a positive current collector and a positive active material in contact with the positive current collector; a negative electrode, the negative electrode having 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; and an absorbent glass mat separator between the positive electrode and the negative electrode; electrolyte within the container; and one or more terminal posts extending from the container or the cover and electrically coupled to the one or more cell elements.

Assignees

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

Inventors

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

Classifications

• H01M4/68

  for use in lead-acid accumulators · CPC title

• H01M4/627

  Expanders for lead-acid accumulators · CPC title

• H01M4/20 Primary

  of pasted electrodes · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/296

  characterised by terminals of battery packs (terminals of batteries H01M50/543) · CPC title