Microstructural comparison of positive float and trickle discharge operations on the positive electrodes of submarine storage batteries with lead-calcium alloy grids

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dc.contributor.advisorPerkins, A. Jeff
dc.contributor.authorCoyle, Michael Thomas
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentMechanical Engineering
dc.contributor.secondreaderMcNelley, Terry R.
dc.dateSeptember 1976
dc.date.accessioned2012-11-16T18:48:21Z
dc.date.available2012-11-16T18:48:21Z
dc.date.issued1976-09
dc.description.abstractLead calcium alloy grid batteries are utilized as the backup emergency power supply on non-diesel-electric submarines. Sudden and premature capacity losses have been experienced when these batteries are operated in a fleet mode while in standby conditions, hence a continuous drain, or trickle discharge, is maintained in lieu of float. This requires periodic battery charges to restore full capacity. The microstructural effects of float and trickle discharge operation on positive plates from small cells, manufactured from full size submarine battery plates, and studies with a scanning electron microscope. This is complemented with light microscopy observations and x-ray diffraction analysis. A patterned dendritic network of spiny crystals was discovered to be prevalent in the trickle-discharged plates. This network was seen on the grid surface corrosion layer and on a dense layer found in the internal active materials. It is postulated that this network may be related to lead-sulfate dissolution upon recharge.en_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.
dc.description.serviceLieutenant Commander, United States Navyen_US
dc.description.urihttp://archive.org/details/microstructuralc1094517867
dc.identifier.urihttps://hdl.handle.net/10945/17867
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.subject.authorDendritic networken_US
dc.subject.authorFloaten_US
dc.subject.authorTrickle-dischargeen_US
dc.subject.authorActive material morphologyen_US
dc.subject.authorGrid surface corrosion layeren_US
dc.subject.authorBatteryen_US
dc.subject.authorLead-acid batteryen_US
dc.subject.authorBattery capacityen_US
dc.subject.lcshMechanical engineeringen_US
dc.titleMicrostructural comparison of positive float and trickle discharge operations on the positive electrodes of submarine storage batteries with lead-calcium alloy gridsen_US
dc.typeThesisen_US
dspace.entity.typePublication
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.nameM.S. in Mechanical Engineeringen_US
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