Abstract
In order to optimize the electron transfer between the Li4Ti5O12-based active mass and the current collector, the surface of aluminum foil was modified either by alkaline etching or by a carbon coating. The as-modified aluminum foils were coated with an active mass of Li4Ti5O12 mixed with polyvinylidene fluoride, sodium carboxymethyl cellulose, or polyacrylic acid as binders. Untreated aluminum and copper foils served as reference current collectors. The corrosion reactions of aluminum foil with the applied binder solutions were studied and the electrode structure has been analyzed, depending on the binder. Finally, the electrochemical performance of the prepared electrodes was investigated. Based on these measurements, conclusions concerning the electrical contact between the different current collectors and the active masses were drawn. The energy density of the Li4Ti5O12 electrodes cast on carbon-coated aluminum foils was significantly increased, compared to the corresponding electrodes with a copper current collector.
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Acknowledgments
This work was financially supported by the federal ministry of education and research within the framework of the WING program (Project number: 03X0112A) and by the AiF framework (Project number: 16958N). In addition, the authors want to thank D. Kurz and A. Mingers (MPI für Eisenforschung Düsseldorf) for performing the ICP-OES experiments. Furthermore, the authors want to thank Prof. C. Schulz and Dr. H. Wiggers (Institute for Combustion and Gasdynamics (IVG), University of Duisburg-Essen) for providing the biologic VMP 3 potentiostat to measure the CVs of the current collectors.
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Wennig, S., Langklotz, U., Prinz, G.M. et al. The influence of different pre-treatments of current collectors and variation of the binders on the performance of Li4Ti5O12 anodes for lithium ion batteries. J Appl Electrochem 45, 1043–1055 (2015). https://doi.org/10.1007/s10800-015-0878-0
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DOI: https://doi.org/10.1007/s10800-015-0878-0