Multifunctional Umbrella: In Situ Interface Film Forming on the High-Voltage LiCoO 2 Cathode by a Tiny Amount of Nanoporous Polymer Additives for High-Energy-Density Li-Ion Batteries.

Autor: Qi R; Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, 85748, Garching, Germany., Yang M; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Ningbo, Zhejiang Province, 315201, P. R. China., Zheng T; Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, 85748, Garching, Germany., Liu X; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Ningbo, Zhejiang Province, 315201, P. R. China.; School of Materials Science & Engineering, Shanghai University, Shanghai, 200444, P. R. China., Xia Y; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Ningbo, Zhejiang Province, 315201, P. R. China.; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 19A Yuquan Rd, Shijingshan District, Beijing, 100049, P. R. China., Cheng YJ; Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Rd, Ningbo, Zhejiang Province, 315201, P. R. China.; College of Renewable Energy, Hohai University, 1915 Hohai Ave, Changzhou, Jiangsu Province, 213200, P. R. China., Müller-Buschbaum P; Chair for Functional Materials, Department of Physics, TUM School of Natural Sciences, Technical University of Munich, 85748, Garching, Germany.; Heinz Maier-Leibnitz Zentrum (MLZ), Technical University of Munich, Lichtenbergstr. 1, 85748, Garching, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Aug; Vol. 20 (31), pp. e2312087. Date of Electronic Publication: 2024 Mar 05.
DOI: 10.1002/smll.202312087
Abstrakt: The LiCoO 2 (LCO) cathode is foreseen for extensive commercial applications owing to its high specific capacity and stability. Therefore, there is 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 LiPF 6 due to its unique structure, which helps to form a stable, robust, and inorganic-rich cathod-eelectrolyte interphase (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.
(© 2024 The Authors. Small published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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