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dc.contributor.authorJanse van Rensburg, Angelique
dc.contributor.authorVan Schoor, George
dc.contributor.authorVan Vuuren, Pieter Andries
dc.date.accessioned2017-01-20T11:26:53Z
dc.date.available2017-01-20T11:26:53Z
dc.date.issued2016
dc.identifier.citationJanse van Rensburg, A. et al. Variance-based sensitivity of localized sulphation to microporous separator properties using a distributed parameter model of a valve-regulated lead-acid battery. ECS transactions, 75(1):27-47. [http://ecst.ecsdl.org/]en_US
dc.identifier.issn1938-5862
dc.identifier.issn1938-6737 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/19841
dc.identifier.urihttp://dx.doi.org/10.1149/07501.0027ecst
dc.identifier.urihttp://ecst.ecsdl.org/content/75/1/27.full.pdf+html
dc.description.abstractProgressive sulphation of the negative electrode in a lead-acid battery under high-rate operation remains a serious problem. This study investigates how healthier end-of-discharge conditions, in a valve-regulated lead-acid battery with an immobilized electrolyte, can be achieved by calculated changes in the separator’s porosity, thickness and tortuosity. The solubility, volume fraction and geometry factor of local PbSO4 crystals are modeled using a distributed parameter model and observed during a high-rate discharge in simulation. A variance-based sensitivity analysis, consisting of a Monte Carlo experiment and Jansen’s formulae for variance decomposition, is performed to quantify the effects of separator design on localized sulphation. The concentration profile across different regions of the cell is also briefly examined by means of a statistical equation for the concentration non-uniformity. The results indicate that the separator thickness has the greatest effect on the PbSO4 crystals at the negative electrode because it severely influences the concentration profile in this region. The simulation results also indicate that separator design with the aim of manipulating the concentration profile, and enabling faster homogenization within a lead-acid cell, can be achieved. We conclude that it is possible to design a microporous separator that improves the dissolution, during recharge, of the PbSO4 crystals on the negative electrode that initially formed during a high-rate discharge. The quantitative approach we have followed can be used to quickly evaluate thousands of different separator designs and determine a suitable starting point for experimental worken_US
dc.language.isoenen_US
dc.publisherElectrochemical Societyen_US
dc.titleVariance-based sensitivity of localized sulphation to microporous separator properties using a distributed parameter model of a valve-regulated lead-acid batteryen_US
dc.typeArticleen_US
dc.contributor.researchID12134457 - Van Schoor, George
dc.contributor.researchID10732926 - Van Vuuren, Pieter Andries


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