ADDITIV ZUR HERSTELLUNG DER POSITIVEN AKTIVEN MASSE FÜR BLEIAKKUMULATOREN EIN VERFAHREN ZU DESSEN HERSTELLUNG UND DESSEN VERWENDUNG

摘要

The additive comprises a tetra basic lead sulfate of an average particle size of less than 3 micro meters and pyrogenic silicic acid preventing agglomeration of the sulfate particles. The pyrogenic silicic acid has particle size from 20 to 80 nano meter. The silicic acid is present in an amount from 0.05 to 20 weight percentage, based on total weight of tetra basic lead sulfate and pyrogenic silicic acid. Independent claims are also included for the following: (a) a positive active material for a lead-acid storage battery comprising an additive (b) a method for producing an additive for a positive active material for a lead-acid storage battery (c) a method for producing plates for lead-acid storage batteries.