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Title: Surface regulation enables high stability of single-crystal lithium-ion cathodes at high voltage

Journal Article · · Nature Communications

Single crystal cathode materials for lithium ion batteries have attracted increasing interests for providing greater capacity retention than their polycrystalline counterparts. However, after being cycled at high voltages, these single crystal materials exhibited severe structural instability and capacity fade. Understanding on how the surface structural changes determine the performance degradation over cycling is crucial but remains elusive. Here, we investigated the correlation of the surface structure, internal strain and capacity deterioration by using operando X-ray spectroscopy imaging and nano-tomography. We directly observed a close correlation between surface chemistry and phase distribution from homogeneity to heterogeneity, which induces heterogeneous internal strain within the particle and the resulting structural/performance degradation during cycling. We also discover that surface chemistry can significantly enhance the cyclic performances. Our modified process effectively regulates the performance fade issue of single-crystal cathode and provides new insights for improved design of high-capacity battery materials.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); Harbin Institute of Technology
Grant/Contract Number:
SC0012704; AC02-76SF00515; AC02-06CH11357
OSTI ID:
1633477
Alternate ID(s):
OSTI ID: 1643997; OSTI ID: 1647355; OSTI ID: 1671820
Report Number(s):
BNL-216191-2020-JAAM; 3050; PII: 16824
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 11 Journal Issue: 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 144 works
Citation information provided by
Web of Science

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