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| Hauptseite > Publikationsdatenbank > Identical Materials but Different Effects of Film-Forming Electrolyte Additives in Li Ion Batteries: Performance of a Benchmark System as the Key |
| Hauptseite > Publikationsdatenbank > Identical Materials but Different Effects of Film-Forming Electrolyte Additives in Li Ion Batteries: Performance of a Benchmark System as the Key |
| Journal Article | FZJ-2020-02948 |
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2020
American Chemical Society
Washington, DC
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Please use a persistent id in citations: http://hdl.handle.net/2128/29467 doi:10.1021/acs.chemmater.0c01952
Abstract: The further increase of practically usable specific energies in lithium ion batteries (LIBs) can be realized by minimizing the specific capacity losses, e.g., via electrolyte additives. However, the interpretation of research results of additive effects on the performance is challenging, because even for identical materials and conditions different effects on performance are observed, rendering the validity, evaluation, and comparison of electrolyte additives difficult. In this work, we show that such ambiguity can be significantly influenced by the quality of the used benchmark system, i.e., the cell/electrolyte system without additive. The additive effects are low when the used benchmark system performs well. Vice versa, in poor performing cell/electrolyte systems, the effect of the same additive appears strong. Hidden and inconspicuous cell parameters, e.g., the type of graphite electrode preparation prior to cell assembly (e.g., calendered vs hand-pressed graphite electrodes), can significantly affect the performance of the benchmark system and, thus, in turn the resulting additive effect. It is shown that calendered graphite electrodes reveal a better performance in the LIB cell than hand-pressed graphites but have a lower relative additive effect (i.e., lower capacity increase), while absolute performance and practical relevance of the data is better. Overall, for a valid and systematic additive research the use of an application-oriented and, thus, optimized benchmark system is recommended.
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