Core-shell particles based on red lead for lead-acid batteries

Patent metadata

Field	Value
Publication number	US-12015144-B2
Application number	US-202217656053-A
Country	US
Kind code	B2
Filing date	Mar 23, 2022
Priority date	Mar 24, 2021
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

Core-shell particles may be based on red lead coated with pyrogenically produced titanium dioxide and/or a pyrogenically produced aluminum oxide, and a process may prepare such core-shell particles which may be used in lead-acid batteries. The red lead may include PbO 2 in a range of from 25 to 32 wt. %.

First claim

The invention claimed is:

1. A core-shell particle, comprising:
a core comprising red lead; and
a shell comprising a pyrogenically produced titanium dioxide and/or a pyrogenically produced aluminum oxide.

2. The core-shell particle of claim 1 , wherein the red lead comprises PbO 2 in a range of from 25 to 32 wt. %.

3. The core-shell particle of claim 1 , having an average particle size d50 of not more than 5 μm.

4. A Plurality of core-shell particles comprising the core-shell particle of claim 1 , wherein the plurality of core-shell particles has a tamped density in a range of from 2.3 to 3.0 g/cm 3 .

5. The core-shell particle of claim 1 , wherein the titanium dioxide and/or the aluminum oxide has an average aggregate particle size d50 in a range of from 10 to 150 nm, as determined by TEM analysis.

6. The core-shell particle of claim 1 , wherein the titanium dioxide and/or the aluminum oxide is present in a range of from 0.1 to 10 wt. %, based on total core-shell particle weight.

7. The core-shell particle of claim 1 , wherein the titanium dioxide and/or the aluminum oxide has a BET surface area in a range of from 5 to 200 m 2 /g.

8. The core-shell particle of claim 1 , comprising tetrabasic lead sulfate (4PbO×PbO 4 ).

9. The core-shell particle of claim 8 , comprising:
the tetrabasic lead sulfate in a range of from 0.1 to 10 wt. %, based on by total core-shell particle weight.

10. A process for producing the core-shell particle of claim 1 , the process comprising:
dry mixing the red lead and the pyrogenically produced titanium dioxide and/or aluminum oxide.

11. The process of claim 10 , wherein the dry mixing is conducted with an electric mixing unit at an electrical power in a range of from 0.05 to 1.5 kW per kg of the red lead.

12. A paste composition suitable for a lead-acid battery, the composition comprising:
the core-shell particle of claim 1 .

13. An electrode suitable for a lead-acid battery, the electrode comprising:
the core-shell particle of claim 1 .

14. A lead-acid battery, comprising:
the core-shell particle of claim 1 .

15. A process of making a lead-acid battery, the method comprising:
combining the core-shell particle of claim 1 with a component of the lead-acid battery.

16. The core-shell particle of claim 1 , comprising the titanium dioxide.

17. The core-shell particle of claim 1 , comprising the aluminum oxide.

18. The core-shell particle of claim 1 , comprising the titanium dioxide and aluminum oxide.

Assignees

• Evonik Operations Gmbh

Inventors

• Esken Daniel
• Glagla Michael
• Bussar Rainer
• Kirchgessner Micha
• Klein Ian

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M4/21 Primary

  Drying of pasted electrodes · CPC title

• H01M2300/0011

  Sulfuric acid-based · CPC title

• H01M2004/028

  Positive electrodes · CPC title