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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster Session II
CPP 32.19: Poster
Donnerstag, 20. März 2025, 09:30–12:00, P3
In-situ interface film forming on the high-voltage LiCoO2 cathode by a tiny amount of nanoporous polymer additives — •Ruoxuan Qi1, Ming Yang1, Tianle Zheng1, Xingchen Liu2, Yonggao Xia2, Ya-Jun Cheng2, 3, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2NIMTE, CAS, Zhejiang Province, P. R. China — 3College of Renewable Energy, Hohai University, Jiangsu Province, P. R. China
The LiCoO2 (LCO) cathode has been foreseen 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 from 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 modulates 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 the cyclic stability and improving the rate performance, providing new perspectives for the electrodes fabrication and improving LCO-based high-energy-density cathodes.
Keywords: polymer with intrinsic microporosity; electrode additive; high-voltage LiCoO2; cathode-electrolyte interface