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Comparison of Dynamic Charge Acceptance Tests on Lead-Acid Cells for Carbon Additive Screening
Citation key https://doi.org/10.1002/ente.202101051
Author Bozkaya, Begüm and Bauknecht, Sophia and Settelein, Jochen and Kowal, Julia and Karden, Eckhard and Giffin, Guinevere A.
Pages 2101051
Year 2022
DOI https://doi.org/10.1002/ente.202101051
Journal Energy Technology
Volume n/a
Number n/a
Abstract Including a certain amount of carbon in the negative active material is currently the state-of-the-art method to improve the dynamic charge acceptance (DCA) of lead-acid batteries. The DCA is a key parameter of batteries used in micro-hybrid cars where brake energy recuperation is implemented. To find the optimal carbon additive, it is essential to test the carbon both in short-term and long-term tests. This work investigates the long-term and short-term DCA of 2 V, 2.5 Ah lead-acid cells and correlates the results with the external surface area of the carbon. Five different carbons with tailored particle size (27 nm – 633 nm) and external surface area (7.1 m2 g-1 – 159.3 m2 g-1) were employed as additives in the negative electrodes. The charge acceptance of cells according to the charge acceptance test 2 (SBA), the DCA (EN) test and the Run-in DCA test (Ford) is increased via an increase in the carbon external surface area. A correlation between the short-term tests and the first weeks of the Run-in DCA test is established for the carbon impact. After several weeks of Run-in DCA test, the carbon effect is diminished and only a differentiation between high and low DCA cells is possible. This article is protected by copyright. All rights reserved.
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