Understanding Degradation and Enhancing Cycling Stability for High‐Voltage LiCoO2‐Based Li‐Metal Batteries
Year: 2024
Type: article
Abstract: Improving the energy density of Lithium (Li)‐ion batteries (LIBs) is vital in meeting the growing demand for high‐performance energy storage and conversion systems. Developing high‐voltage LIBs using high‐capacity and high‐voltage cathode materials is promising for enhancing energy density. However, conventional cathode and electrolyte materials face serious decomposition and structural degradation at high operating voltages. Herein, a dual‐salts electrolyte of lithium bis(fluorosulfonyl)imide and lithium bis(trifluoromethanesulfonyl)imide(LiFSI‐LiTFSI) is developed to improve the cycling stability of high‐voltage lithium cobalt oxide (LiCoO2, LCO)||Li batteries. Operando X‐ray diffraction analysis experiments are carried out to characterize the structural stability of cathode materials, suggesting a severe irreversible phase transformation at high voltage levels. Aging simulations, combined with experimental studies, suggest that a fast loss of active materials is mainly responsible for the capacity loss at high voltages. Carbon‐coated LCO cathodes are synthesized to mitigate cycling degradation. The designed LCO||Li cells exhibit a high‐capacity retention of over 85% after 400 cycles at 4 .7V. The present work provides a novel insight into understanding the degradation and enhancing the stability of high‐voltage LCO‐based Li‐metal batteries, thus facilitating their practical applications.
Source: Advanced Energy Materials
Authors: Baolin Wu, Zhenghua Chang, Zhiqiang Chen, Anna Windmüller, Chih‐Long Tsai, Zhizhen Qin, Dmitri L. Danilov, Lei Zhou, Davis Thomas Daniel, Kristian Schaps, Jehad Ahmed, Luc H. J. Raijmakers, Shicheng Yu, Hermann Tempel, Josef Granwehr, Chunguang Chen, Yujie Wei, Rüdiger‐A. Eichel, Peter H. L. Notten
Institutions: Forschungszentrum Jülich, RWTH Aachen University, University of Science and Technology of China, Eastern Institute of Technology, Ningbo, Eindhoven University of Technology, Jiangsu University, Chinese Academy of Sciences, Institute of Mechanics, University of Chinese Academy of Sciences, University of Technology Sydney
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,510
Funders: National Natural Science Foundation of China, Bundesministerium für Bildung und Forschung, Chinese Academy of Sciences, China Postdoctoral Science Foundation, China Scholarship Council, Natural Science Foundation of Jiangsu Province, Natural Science Foundation of Beijing Municipality, Beijing Municipal Natural Science Foundation
OpenAlex ID: W4405616776