GravityGuard™ —An Additive for EFB Technology and Deep-Cycle Applications for Electrolyte Stratification Reduction

BCI 2021 Sally Breidegam Miksiewicz Innovation Award winner

Stratification in lead–acid batteries is almost as old as the technology itself.  As the industry seeks to improve many key features, novel materials can open new pathways.  Hammond Group Inc. has developed an additive in the form of a metal silicate.  This award-winning innovation improves the retention and distribution of H+ ions, thereby combatting stratification when added to the positive and/or the negative active mass.  Alternative battery technologies (gel, AGM) seek to prevent stratification through the immobilization of electrolyte.  Although this approach has improved cycle-life, it comes with a large price tag in both manufacturing and for the consumer, as well as a higher sensitivity to abuse conditions.  The addition of metal silicate to the active material generates micro ‘gel structures’ that have a similar effect as gel electrolyte.  Data is presented that  describes the effects of metal silicate in active material during mixing, after curing, after forming and after cycling.  Laboratory cells (2-V) are used as an indicator of battery performance.  Full-scale test battery results reveal not only a greater reduction in stratification, but also an improvement in cold-cranking and cycling.  Our patent-pending GravityGuard™ product is a novel solution to an age-old problem.


Mr Thomas Wojcinski R&D Chemist, Hammond Group, Inc., USA

Thomas Wojcinski holds a B.S. in Chemistry from Purdue University and is one of Hammond Group’s Research and Development Scientists.  His 16 years of experience in lead-acid battery additive and materials research has involved ALABC–CBI research projects and Hammond product development projects including Treated SureCureTM. Currently,  GravityGuardTM is his first application for a co-patent.