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AEROSIL® fumed silica and AEROXIDE® fumed metal oxides for batteries


AEROSIL® fumed silica is a highly dispersible silicon dioxide.


Using the AEROSIL-process, other special oxides such as fumed aluminium oxide, e.g. AEROXIDE® Alu C, titanium dioxide, e.g. AEROXIDE® TiO₂ P 25 have been developed. The surface of AEROSIL® or AEROXIDE® particles can be chemically modified by reaction of the OH groups on the silica or metal oxide surface with various silanes, resulting in hydrophobic fumed silicas and hydrophobic metal oxides. For easy handling, AEROSIL® and AEROXIDE® can also be dispersed in water or other solvents. The stable dispersions are marketed under the brand name AERODISP®.

AEROSIL® is used as efficient gel forming additive for the manufacturing of gels in lead acid batteries and as electrolyte additives in lithium polymer batteries. AEROXIDE® fumed alumina and AERODISP® are successfully used as ceramic additive in lithium-ion battery separators and as coating additive for cathode materials.

AEROSIL® for Batteries

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Technical Information 1412: AEROSIL® fumed silica in gel lead acid batteries  (pdf, 8.83 MB)

The Technical Information 1412 provides an overview about the use of AEROSIL® for gelification and therefore immobilization of sulfuric acid to increase life time of gel batteries. This brochure gives a deeper insight into the topics: fumed silica, gelling process of sulfuric acid, and electrochemical performance. These information are of importance, especially for gel battery manufacturer to find the right process conditions for incorporation of AEROSIL® into sulfuric acid. In addition, the differences of gels made from AEROSIL® fumed silica and silica sol are compared with each other and their influence on the final battery performance are discussed.

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