TY  - JOUR
AU  - Wu
AU  - Chang
AU  - Chen, Zhiqiang
AU  - Windmüller, Anna
AU  - Tsai, Chih-Long
AU  - Qin, Zhizhen
AU  - Danilov, Dmitri
AU  - Zhou, Lei
AU  - Daniel, Davis Thomas
AU  - Schaps, Kristian
AU  - Ahmed, Jehad
AU  - Raijmakers, Luc
AU  - Yu
AU  - Tempel, Hermann
AU  - Granwehr, Josef
AU  - Chen, Chunguang
AU  - Wei
AU  - Eichel, Rüdiger-A.
AU  - Notten, Peter H. L.
TI  - Understanding Degradation and Enhancing Cycling Stabilityfor High-Voltage LiCoO2-Based Li-Metal Batteries
JO  - Advanced energy materials
VL  - 15
IS  - 7
SN  - 1614-6832
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2025-00754
SP  - 2404028
PY  - 2025
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001380216200001
DO  - DOI:10.1002/aenm.202404028
UR  - https://juser.fz-juelich.de/record/1037569
ER  -