Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.29: Poster
Monday, March 9, 2026, 19:00–21:00, P5
Investigation of the Effects of LiDFOB Salt Concentration on the Fast-Charging Performance of LiCoO2 Cathodes — •Yifeng Liu, Ming Yang, and Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany
Fast-charging lithium-ion batteries have drawn increasing interest, yet lithium cobalt oxide (LiCoO2) paired with commercial electrolytes generally suffers from severe capacity fading and limited cycle life at high charging rates. This study aims to explore strategies for improving capacity retention of LiCoO2-based lithium-ion batteries under fast-charging conditions. We employ boron-containing lithium salt LiDFOB as an electrolyte additive and systematically investigate its concentration-dependent effects on the capacity retention of LCO cells under fast-charging operation. Interfacial stability and charge-transfer kinetics associated with different LiDFOB levels are evaluated through cyclic voltammetry (CV), linear sweep voltammetry (LSV), Tafel analysis, and chronoamperometry (CA). The results show that the concentration of LiDFOB has a pronounced influence on the cycling performance. In particular, the optimized LiDFOB concentration enables the LCO cells to stably cycle for over 1000 cycles at 1C and 3C, benefiting from the improved interfacial stability and enhanced Li+ transference number. Morphological and material characterizations further reveal that different LiDFOB concentrations generate SEI films with distinct compositions and structures, which account for the disparities in fast-charging capacity retention.
Keywords: Lithium-ion battery; Fast-charging; LiDFOB