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US 2003/0157405 A1Published application
Electrode
AssigneeDelphi Technologies, Inc.
InventorsRongrong Chen, John Lewis Ayres
Life of this patent
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Abstract
An electrode comprising a noble-metal free grid comprising lead, wherein the grid has an essentially PbO free PbO2 coating covering all, or essentially all of the surface of the grid. Also described is a method of forming an electrode, comprising applying an essentially PbO free PbO2 coating to a noble-metal free grid comprising lead, wherein the coating covers all, or essentially all of the surface of the grid.
Claims47
An electrode comprising:
- a noble-metal free grid comprising lead, wherein said grid has an essentially PbO free PbO2 coating covering all, or essentially all of the surface of said grid.
A method of forming an electrode, comprising:
- applying an essentially PbO free PbO2 coating to the surface of a noble-metal free grid comprising lead, wherein said coating covers all, or essentially all of the surface of said grid.
A method of forming an electrode, comprising:
- electrolytically depositing an essentially PbO free PbO2 coating onto the surface of a noble-metal free grid comprising lead, tin and calcium, wherein said coating has a thickness not less than 5 microns and not more than 500 microns, and wherein said coating covers all, or essentially all of the surface of said grid to produce a coated grid;
- applying a paste comprising lead and lead oxide to the surface of said coated grid to produce a pasted grid;
- contacting said pasted grid with steam for at least one hour to produce a steamed grid;
- curing said steamed grid at about 50 percent humidity and about 55° C. for at least about 24 hours to produce a cured grid;
- followed by
- contacting said grid with aqueous sulfuric acid prior to passing an external electric current of sufficient voltage and amperage through said cured grid for a sufficient period of time to convert at least a portion of said applied paste into lead dioxide.
3 more elements
Dependencies are inferred from the claim text.