Graphitized Carbon Nanofibers: new additive for the Negative Active Material of Lead Acid Batteries

•Graphitized Carbon Nano Fibers with high aspect ratio were used as additives.•These carbon nanofibers were dispersed together with a lignosulfonate.•2V/1Ah Lead Acid cells were prepared for testing the negative plate performance.•Nanofibers improved negative plates overall conductivity and cycle li...

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Bibliographic Details
Published in:Electrochimica acta 2017-12, Vol.257, p.109-117
Main Authors: Blecua, M., Fatas, E., Ocon, P., Gonzalo, B., Merino, C., de la Fuente, F., Valenciano, J., Trinidad, F.
Format: Article
Language:English
Subjects:
Additives
Batteries
Carbon
Carbon fibers
Carbon Nanofibers
conductive network
Cranking
Dispersion
Graphitization
High aspect ratio
Lead acid batteries
Nanofibers
Plates
PSoC cycles
Studies
sulfation
Voltammetry
Water loss
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Summary:•Graphitized Carbon Nano Fibers with high aspect ratio were used as additives.•These carbon nanofibers were dispersed together with a lignosulfonate.•2V/1Ah Lead Acid cells were prepared for testing the negative plate performance.•Nanofibers improved negative plates overall conductivity and cycle life.•High dosages of Nanofibers raised Hydrogen Evolution Reaction rate. Graphitized Carbon Nanofibers (GANFg) were dispersed with a certain amount of organic expander and used as additive for the negative plates of the Lead Acid Batteries (LABs). Due to the high aspect ratio of these fibers, they are thought to reach the percolation threshold inside the Negative Active Material (NAM) and create a conductive network which would improve the cycle life of the LABs working in Partial State of Charge (PSoC) conditions. These fibers were added at three concentrations (0.50, 0.20 and 0.10wt. %) and dispersed in a sodium lignosulfonate aqueous solution. Unformed negative plates of three mixtures were prepared, together with a NAM Control sample, and 2V/1Ah small lead acid cells were assembled for testing the electrical performance of the different mixtures (capacity, cold cranking ability, charge acceptance, negative polarization study, PSoC cycles and Cyclic Voltammetry (CV)). Continuous physicochemical analysis was carried out for the negative plates. As a result, Carbon Nanofibers were able to increase cell cycle life working in PSoC conditions and slightly improve the charge acceptance, but also raised the water loss. However, this gassing increase was lower for Carbon Nanofibers in comparison with other carbon materials used in flooded LABs.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.10.067