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Charge Acceptance

Investigations on the influence of additives on the structure and behavior of lead electrodes in order to improve dynamic charge acceptance of batteries in micro-hybrid vehicle application

  • Collaborative project
  • Partners: Fraunhofer Institute for Silicate Research ISC, TU Berlin & Ford Research and Advanced Engineering Europe
  • Sponsored by ALABC
  • Project duration: 12/2017 - 05/2019

The goal of the project is to understand how representative it is to test the dynamic charge acceptance (DCA) on laboratory cell level. Therefore, two different approaches are utilized.

In the first approach, small 2 V laboratory test cells with one negative and two positive electrodes are prepared. This approach is called the bottom-up approach, as it starts with paste preparation on laboratory scale. The key aspect of this approach is the usage of tailored carbon additives that are able to adjust the DCA of the electrodes. By using five different carbons with a significant difference in the specific external surface area, it be possible to generate 2 V test cells with significant differences in their DCA performance. With help of these test cells a better understanding of the DCA in general and in respect to the long term DCA (after run-in) can be generated.

In the second approach, commercial 12 V EFB and EFB+C batteries with distinct differences in their DCA performance will be used. This approach is called the top-down approach because 2 V test cells with reduced numbers of electrodes shall be extracted from those 12 V batteries. This investigation should illustrate how the DCA of the original batteries is affected by changing the number of electrodes and the ratio between the positive active mass, the negative active mass and the electrolyte.

Project Goals

  • How meaningful are DCA tests on the laboratory-cell level?
  • How do the size and number of plates in test cells influence the measurement of the DCA?
  • How do carbon additives improve the long term DCA after run-in?
  • What is the origin of the decline in DCA during several weeks of field or laboratory operation?
  • Is there a correlation between cyclic voltammetry/Tafel testing, impedance spectroscopy and DCA?

Zusatzinformationen / Extras

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Contact

M.Sc. Sophia Matthies
030 314 73612
Room EMH 129

Address

Technische Universität Berlin
Electrical Energy Storage Technology
Institute of Energy and Automation Technology
Faculty IV
sec. EMH 2
Einsteinufer 11
D-10587 Berlin