Metal working – Method of mechanical manufacture – Electrical device making
Patent
1992-10-06
1993-10-12
Willis, Jr., Prince
Metal working
Method of mechanical manufacture
Electrical device making
296235, 423559, 423619, 429218, 429225, 429227, 429228, H01M 1038
Patent
active
052521052
ABSTRACT:
In a preferred method, an electrode for a lead-acid battery is prepared in a new continuous process without the conventional curing step. The general procedure for preparing electrodes includes preparing a mixture (paste) comprising an active material precursor and an inhibitor. The active material precursor includes lead oxides having at least 10% by weight lead oxide in the form of Pb.sub.3 O.sub.4 (red lead), and a BET surface area of at least about 0.8 m.sup.2 /gram; desirably about 1.00 to 1.50 m.sup.2 /gram and preferably about 1.0 to 1.25 m.sup.2 /gram. The inhibitor prevents formation of tribasic lead sulfate and tetrabasic lead sulfate from the precursor material, except at elevated temperature. The paste is applied to electrode grids and reacted at elevated temperatures for between about 5 and about 30 minutes, to form the active material of the electrode for both positive and negative electrodes. Plates are then assembled into batteries and charged. Negative electrodes differ from the positive, mainly in the additives used.
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Garabedian Gregory C.
Witherspoon Romeo R.
General Motors Corporation
Muzzolillo M.
Plant Lawrence B.
Willis Jr. Prince
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