Two-step pasting of thin electrodes

Details Two-step pasting of thin electrodes Two-step pasting of thin electrodes

1997-01-30

1999-09-28

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429 94, 296235, 4271261, 4273884, 427427, H01M 462

Patent

active

059586214

ABSTRACT:
A pasting operation for thin foils used in rechargeable electrochemical cells includes spraying a water based litharge on a lead foil substrate before the foil is wound to form a cylindrical electrode. To overcome problems with plate density, porosity and incomplete formation, the process would include the additional step of spraying an aqueous solution of an oxidant such as potassium persulfate on top of the litharge. The lag between spraying, the temperature and the concentrations are adjusted to cause the solution to mix into the damp paste and the litharge would be converted to conductive oxides. Improvements in plate density and increased porosity are noted and the process helps complete formation. Performance of the plates is also improved.

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