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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 15: Poster I
CPP 15.27: Poster
Monday, March 18, 2024, 18:00–20:00, Poster C
In-situ interface film forming on the high-voltage LiCoO2 cathode by a tiny amount of nanoporous polymer additives — •Ruoxuan Qi1, Ming Yang3, Tianle Zheng1, Ya-Jun Cheng3, 4, and Peter Müller-Buschbaum1, 2 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2MLZ, TUM, Garching, Germany — 3NIMTE, CAS, Zhejiang Province, P. R. China — 4College of Renewable Energy, Hohai University, Jiangsu Province, P. R. China
LiCoO2 (LCO) has been proven for extensive commercial applications owing to its high specific capacity and stability. Therefore, there has been considerable interest in further enhancing its specific capacity by increasing the charging voltage. However, single-crystal LCO suffers a significant capacity degradation when charged to 4.5 V due to the irreversible phase transition and unstable structure. Herein, an ultra-small amount (0.5%wt in the electrode) of multi-functional PIM-1 (a polymer with intrinsic microporosity) additive is utilized to prepare a kind of binder-free electrode. PIM-1 can modulate the solvation structure of LiPF6 due to its unique structure, which helps to form a stable, robust and inorganic-rich CEI film on the surface of LCO at a high voltage of 4.5 V. This reduces the irreversible phase transition of LCO, thereby enhancing cyclic stability and improving rate performance, providing new perspectives for electrodes fabrication and improving high-energy-density cathodes.
Keywords: polymer with intrinsic microporosity; electrode additive; high-voltage LiCoO2; cathode-electrolyte interface