@article{FrankenbergerSinghDinteretal.2019, author = {Frankenberger, Martin and Singh, Madhav and Dinter, Alexander and Jankowsky, Sebastian and Schmidt, Alexander and Pettinger, Karl-Heinz}, title = {Laminated Lithium Ion Batteries with improved fast charging capability}, series = {Journal of Electroanalytical Chemistry}, volume = {837}, journal = {Journal of Electroanalytical Chemistry}, doi = {https://doi.org/10.1016/j.jelechem.2019.02.030}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:860-opus4-2741}, pages = {151 -- 158}, year = {2019}, abstract = {The fast charge and discharge capability of lithium-ion batteries is improved by applying a lamination step during cell assembly. Electrode sheets and separator are laminated into one stack which improves the electrochemical performance as well as the stack assembly process. The effect of non-laminated and laminated interfaces on the reversible capacity during cycling are studied thoroughly in half-cell and full-cell configurations. The fully-laminated cells show a reduction in the capacity losses of 3\%, 5\% and 12\% upon cycling at 2C, 3C and 5C-rate, respectively, while capacity losses of 6\%, 11\% and 23\% are observed in non-laminated cells at the same C-rates. A significant reduction in the capacity fading at high C-rates is observed upon lamination. Additional compression is applied on the cells to compare the effect of lamination and compression on the cell performance. The laminated cells show an improvement in the fast charging capability in comparison to the non-laminated cells.}, language = {en} } @article{SchaelickeLandwehrDinteretal.2019, author = {Sch{\"a}licke, Gerrit and Landwehr, Inga and Dinter, Alexander and Pettinger, Karl-Heinz and Haselrieder, Wolfgang and Kwade, Arno}, title = {Solvent-Free Manufacturing of Electrodes for Lithium-Ion Batteries via Electrostatic Coating}, series = {Energy Technology}, journal = {Energy Technology}, doi = {10.1002/ente.201900309}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:860-opus4-2819}, year = {2019}, abstract = {This work demonstrates the feasibility of a novel solvent-free anode production for lithium-ion batteries. It combines a modified dry-mixing procedure with an innovative electrostatic coating process. The mixing is divided into two steps. At first, carbon black and binder are deagglomerated and recombined to a matrix structure by intensive mixing. In a second less intensive step, this matrix is blended with graphite. The powder mixture is fluidized and then transferred to the current collector by inducing a high voltage. After a subsequent hot pressing step, the powder coating is permanently fixed on the current collector. This procedure is presented with three different fluorinated binders. Furthermore, effects of different mixing intensities on the powder and electrode properties are examined. The electrodes are investigated in the three-electrode T-cell setup versus lithium metal to examine their C-rates and cycle stabilities. The produced anodes offer comparable electrochemical performance to conventional wetcoated ones on electrode and cell levels. Overall, this new process is a suitable alternative to the conventional electrode production techniques.}, language = {en} } @article{deGiorgioLaMonacaDinteretal.2018, author = {de Giorgio, Francesca and La Monaca, Andrea and Dinter, Alexander and Frankenberger, Martin and Pettinger, Karl-Heinz and Arbizzani, Catia}, title = {Water-processable Li4Ti5O12 electrodes featuring eco-friendly sodium alginate binder}, series = {Electrochimica Acta}, volume = {289}, journal = {Electrochimica Acta}, doi = {https://doi.org/10.1016/j.electacta.2018.09.017}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:860-opus4-2723}, pages = {112 -- 119}, year = {2018}, abstract = {Electrodes based on Li4Ti5O12 (LTO) with sodium alginate (SA) binder featuring high percentage of active material and operating in glyme-based electrolyte are here proposed for the first time. Three electrode formulations operating in ethylene carbonate: dimethyl carbonatee1M LiPF6 (LP30) and 1m lithium bis(trifluoromethane) sulfonimide - tetraglyme were tested in half-cell vs. Li and compared to conventional 80\% LTO and 10\% polyvinylidene fluoride binder. Electrodes with 87\% LTO and 3\% SA binder show the best performance, with good rate capability and excellent cycling stability over 600 cycles at 1C in both electrolytes. The use of SA is beneficial as it allows made-in-water electrode manufacturing in absence of N-methyl-2-pyrrolidone, a toxic and expensive solvent required by fluorinated binders. SA also permits to decrease its amount to 3\% increasing the active material percentage, and to develop a final device with higher specific energy.}, language = {en} } @article{FrankenbergerSinghDinteretal.2019, author = {Frankenberger, Martin and Singh, Madhav and Dinter, Alexander and Pettinger, Karl-Heinz}, title = {EIS Study on the Electrode-Separator Interface Lamination}, series = {Batteries}, volume = {5}, journal = {Batteries}, number = {71}, doi = {doi:10.3390/batteries5040071}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:860-opus4-2751}, year = {2019}, abstract = {This paper presents a comprehensive study of the influences of lamination at both electrode-separator interfaces of lithium-ion batteries consisting of LiNi1/3Mn1/3Co1/3O2 cathodes and graphite anodes. Typically, electrode-separator lamination shows a reduced capacity fade at fast-charging cycles. To study this behavior in detail, the anode and cathode were laminated separately to the separator and compared to the fully laminated and non-laminated state in single-cell format. The impedance of the cells was measured at different states of charge and during the cycling test up to 1500 fast-charging cycles. Lamination on the cathode interface clearly shows an initial decrease in the surface resistance with no correlation to aging effects along cycling, while lamination on both electrode-separator interfaces reduces the growth of the surface resistance along cycling. Lamination only on the anode-separator interface shows up to be suffcient to maintain the enhanced fast-charging capability for 1500 cycles, what we prove to arise from a significant reduction in growth of the solid electrolyte interface.}, subject = {Lithium-Ionen-Akkumulator}, language = {en} } @article{FrankenbergerTrunkSeidlmayeretal.2020, author = {Frankenberger, Martin and Trunk, Markus and Seidlmayer, Stefan and Dinter, Alexander and Dittloff, Johannes and Werner, Lukas and Gernh{\"a}user, Roman and Revay, Zsolt and M{\"a}rkisch, Bastian and Gilles, Ralph and Pettinger, Karl-Heinz}, title = {SEI Growth Impacts of Lamination, Formation and Cycling in Lithium Ion Batteries}, series = {Batteries}, volume = {6}, journal = {Batteries}, number = {21}, doi = {10.3390/batteries6020021}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:860-opus4-2770}, year = {2020}, abstract = {The accumulation of solid electrolyte interphases (SEI) in graphite anodes related to elevated formation rates (0.1C, 1C and 2C), cycling rates (1C and 2C), and electrode-separator lamination is investigated. As shown previously, the lamination technique is beneficial for the capacity aging in graphite-LiNi1/3Mn1/3Co1/3O2 cells. Here, surface resistance growth phenomena are quantified using electrochemical impedance spectroscopy (EIS). The graphite anodes were extracted from the graphite NMC cells in their fully discharged state and irreversible accumulations of lithium in the SEI are revealed using neutron depth profiling (NDP). In this post-mortem study, NDP reveals uniform lithium accumulations as a function of depth with lithium situated at the surface of the graphite particles thus forming the SEI. The SEI was found to grow logarithmically with cycle number starting with the main formation in the initial cycles. Furthermore, the EIS measurements indicate that benefits from lamination arise from surface resistance growth phenomena aside from SEI growth in superior anode fractions.}, language = {en} }