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The mechanism of expander action is reviewed, with special emphasis on the role of its organic constituent and the method by which this constituent is derived from lignin. An alternative material, SYNTAN BNF, is proposed for application as the organic constituent. BNF also increases the overvoltage for gas evolution, which could be of special interest for valve-regulated lead/acid batteries. BNF...
Expanders are an essential component of lead/acid batteries. They prevent performance losses in negative plates that would otherwise be caused by passivation and structural changes in the active material. The functions of the components of modern negative-plate expanders are described and data are presented to show how the capacity and life of the battery are affected by the type and amount of barium...
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