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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster I
CPP 17.26: Poster
Montag, 9. März 2026, 19:00–21:00, P5
Trace Intrinsically Microporous Polymer Additives Induce LiF-Rich SEI for Enhanced Performance of Silicon-Based Lithium-Ion Batteries — •Ming Yang1, Ruoxuan Qi1, Ya-Jun Cheng2, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2College of Renewable Energy, Hohai University, Changzhou, Jiangsu Province, P. R. China
Silicon-carbon (Si/C) composite anodes are promising candidates for high-energy-density lithium-ion batteries due to the high theoretical capacity of silicon. However, their practical application is hindered by severe volume expansion and unstable solid electrolyte interphase (SEI) formation during cycling. Fluoroethylene carbonate (FEC) is commonly used to improve interfacial stability, but its effectiveness is limited by concentration sensitivity and uncontrollable side reactions. This study introduced carboxyl-functionalised intrinsically microporous polymer (PIM-COOH) as a functional additive, achieving dual regulation of electrode structural evolution and interfacial chemistry. Only 0.5wt% PIM-COOH is required to achieve these effects. The Si/C@PIM||Li half-cell retains 90% of its capacity after 300 cycles at 1.0 C, demonstrating excellent long-term stability. The utilisation of 1Ah NCM811-Si/C pouch cells demonstrates its commercial potential. These results demonstrate a scalable and effective strategy for stabilizing silicon-based anodes, offering valuable insight into the design of next-generation lithium-ion batteries with both high energy density and long cycle life.
Keywords: Lithium-Ion Battery; Silicon-Carbon Composite Anodes; Polymer of Intrinsic Microporosity