Experimental and theoretical investigation of nonconductive additives on the performance of positive lead acid battery plates

• Published in: Journal of power sources Vol. 230; pp. 15 - 24
• Main Authors: Woodland, Travis, Sorge, Matthew, Zhang, Song, Bean, Thomas, McAllister, Simon, Canning, John, Xie, Yuqun, Edwards, Dean
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.05.2013; Elsevier
• Subjects: Additives; Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Lead acid batteries; Life; Nonconductive; Utilization; Lead acid batteries; Life; Model; Additives; Nonconductive; Utilization; Performance evaluation; Microsphere; Glass; Secondary cell; Experimental study; Porous material; Thickness; Additive; Porosity; Active material; Comparative study
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.12.014

Additives can be added to lead acid battery electrodes to increase porosity and improve battery power and energy performance. This paper investigates the influence on electrode performance of different sizes and volume percentages of nonconductive additives to provide a clearer understanding of how they affect battery performance. The nonconductive additives used in the electrodes were hollow glass microspheres (HGMs). The solid volume percentages of various sizes of HGMs were varied from 5 to 60%. The discharge capacity for different volume percentages of the HGMs was measured in plates that were hand pasted to similar thicknesses. The utilization of active materials, which is defined as the ratio of the practical discharge ampere-hours over the stoichiometric capacity of the active materials, was plotted with respect to different solid volume percentages of additives. Experimental results were compared with the theoretical values of conductivity models. The change of utilizations with different solid volume percentages of additives compared favorably with the model predictions. ► Nonconductive additives of various sizes are tested in lead acid battery paste. ► Proposed model predicts utilization for batteries with nonconductive additives. ► Model predictions are comparable to measured battery discharge results.