Depth-dependent valence stratification driven by oxygen redox in lithium-rich layered oxide
- Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics (IHEP), Beijing Synchrotron Radiation Facility; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics (IHEP), Beijing Synchrotron Radiation Facility
- Stanford Univ., CA (United States)
- Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing Key Lab. for New Energy Materials and Devices
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
Lithium-rich nickel-manganese-cobalt (LirNMC) layered material is a promising cathode for lithium-ion batteries thanks to its large energy density enabled by coexisting cation and anion redox activities. It however suffers from a voltage decay upon cycling, urging for an in-depth understanding of the particle-level structure and chemical complexity. In this work, we investigate the Li1.2Ni0.13Mn0.54Co0.13O2 particles morphologically, compositionally, and chemically in three-dimensions. While the composition is generally uniform throughout the particle, the charging induces a strong depth dependency in transition metal valence. Such a valence stratification phenomenon is attributed to the nature of oxygen redox which is very likely mostly associated with Mn. The depth-dependent chemistry could be modulated by the particles’ core-multi-shell morphology, suggesting a structural-chemical interplay. These findings highlight the possibility of introducing a chemical gradient to address the oxygen-loss-induced voltage fade in LirNMC layered materials.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Fuel Cell Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Science Foundation (NSF)
- Grant/Contract Number:
- SC0012704; AC02-76SF00515; 2016YFA0400900; ECCS-1542152
- OSTI ID:
- 1735389
- Alternate ID(s):
- OSTI ID: 1737442; OSTI ID: 1779170
- Report Number(s):
- BNL-220716-2020-JAAM
- Journal Information:
- Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
A transition-edge sensor-based x-ray spectrometer for the study of highly charged ions at the National Institute of Standards and Technology electron beam ion trap
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journal | December 2019 |
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