Journal
ACS ENERGY LETTERS
Volume 6, Issue 2, Pages 687-693Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02699
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Funding
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-AC0276SF00515]
- junior faculty start-up grant of Shanghai Jiao Tong University
- Natural Science Foundation of China [22008154]
- Sinopec [420038-1]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) [20198510050010]
- National Key Research and Development Program of China [2016YFA0400900]
- National Natural Science Foundation of China [U2032107]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20198510050010] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study investigates the interplay among electronic structure, lattice configuration, and micro-morphology of nickel-rich cathode materials for lithium-ion batteries during prolonged electrochemical cycling. The research reveals mesoscale reaction heterogeneity in the battery cathode and suggests particle structure engineering as a viable approach to mitigate the chemomechanical degradation of cathode materials.
The degradation of nickel-rich cathode materials for lithium-ion batteries upon prolonged electrochemical cycling features a complicated interplay among electronic structure, lattice configuration, and micro-morphology. The underlying mechanism for such an entanglement of different material properties at nano- to mesoscales is fundamental to the battery performance but not well-understood yet. Here we investigate the correlation between the local redox reaction and lattice mismatch through a nano-resolution synchrotron spectro-microscopy study of LiNi0.8Co0.1Mn0.1O2 (NCM 811) cathode particles. With assistance from a machine-learning-based data classification method, we identify local regions that demonstrate a strain-redox decoupling effect, which can be attributed to different side reactions. Our results highlight the mesoscale reaction heterogeneity in the battery cathode and suggest that particle structure engineering could be a viable approach to mitigate the chemomechanical degradation of cathode materials.
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