%0 Journal Article
%A Wu
%A Chang
%A Chen, Zhiqiang
%A Windmüller, Anna
%A Tsai, Chih-Long
%A Qin, Zhizhen
%A Danilov, Dmitri
%A Zhou, Lei
%A Daniel, Davis Thomas
%A Schaps, Kristian
%A Ahmed, Jehad
%A Raijmakers, Luc
%A Yu
%A Tempel, Hermann
%A Granwehr, Josef
%A Chen, Chunguang
%A Wei
%A Eichel, Rüdiger-A.
%A Notten, Peter H. L.
%T Understanding Degradation and Enhancing Cycling Stabilityfor High-Voltage LiCoO2-Based Li-Metal Batteries
%J Advanced energy materials
%V 15
%N 7
%@ 1614-6832
%C Weinheim
%I Wiley-VCH
%M FZJ-2025-00754
%P 2404028
%D 2025
%X Improving the energy density of Lithium (Li)-ion batteries (LIBs) is vital inmeeting the growing demand for high-performance energy storage andconversion systems. Developing high-voltage LIBs using high-capacity andhigh-voltage cathode materials is promising for enhancing energy density.However, conventional cathode and electrolyte materials face seriousdecomposition and structural degradation at high operating voltages. Herein,a dual-salts electrolyte of lithium bis(fluorosulfonyl)imide and lithiumbis(trifluoromethanesulfonyl)imide(LiFSI-LiTFSI) is developed to improve thecycling stability of high-voltage lithium cobalt oxide (LiCoO2, LCO)||Libatteries. Operando X-ray diffraction analysis experiments are carried out tocharacterize the structural stability of cathode materials, suggesting a severeirreversible phase transformation at high voltage levels. Aging simulations,combined with experimental studies, suggest that a fast loss of activematerials 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% after400 cycles at 4 .7V. The present work provides a novel insight intounderstanding the degradation and enhancing the stability of high-voltageLCO-based Li-metal batteries, thus facilitating their practical applications.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001380216200001
%R 10.1002/aenm.202404028
%U https://juser.fz-juelich.de/record/1037569