Identical Materials but Different Effects of Film-Forming Electrolyte Additives in Li Ion Batteries: Performance of a Benchmark System as the Key

• DOI: 10.1021/acs.chemmater.0c01952
• Publication Date: 2020-07-16T18:51:56Z
• Authors: Sven Klein; Kristina Borzutzki; Patricia Schneider; Olga Fromm; Jakub Reiter; Quan Fan; Tobias Placke; Martin Winter; Johannes Kasnatsc...
• Keywords: Benchmark (surveying)

The further increase of practically usable specific energies in lithium ion batteries (LIBs) can be realized by minimizing the capacity losses, e.g., via electrolyte additives. However, interpretation research results additive effects on performance is challenging, because even for identical materials and conditions different are observed, rendering validity, evaluation, comparison additives difficult. In this work, we show that such ambiguity significantly influenced quality used benchmark system, i.e., cell/electrolyte system without additive. low when performs well. Vice versa, poor performing systems, effect same appears strong. Hidden inconspicuous cell parameters, type graphite electrode preparation prior to assembly (e.g., calendered vs hand-pressed electrodes), affect and, thus, turn resulting effect. It shown electrodes reveal a better LIB than graphites but have lower relative (i.e., increase), while absolute practical relevance data better. Overall, valid systematic use an application-oriented optimized recommended.