Separator fleece for a maintenance-free lead battery with an immobilized electrolyte

Abstract

Abstract The undesired acid stratification in lead accumulators whose electrolyte is held in fleece separators, preferably glass fleeces, can be avoided by artificially increasing the flow resistance within the fleece, without preventing ion movement. This is achieved by soaking the fleece before incorporation with an approximately 3% colloidal silicic acid and subsequently drying it, the SiO2 deposited on the fibres resulting in the weight of the fleece increasing by approximately 20% and its inner surface area increasing from approximately 1 m<2>/g to approximately 50 m<2>/g. The SiO2 particles suitable for producing the colloidal silicic acid have BET surface areas between 100 m<2>/g and 300 m<2>/g with a diameter of approximately 15 nm (15 x 10<7> cm).

Inventors

• 👤 Ernst Dr. Dipl.-Ing. Voss
• 👤 Reinhard Bräutigam

Bibliographic Details