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Title: Depth-dependent valence stratification driven by oxygen redox in lithium-rich layered oxide

Journal Article · · Nature Communications
 [1];  [2];  [3];  [3]; ORCiD logo [2];  [2];  [4]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. 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)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics (IHEP), Beijing Synchrotron Radiation Facility
  5. Stanford Univ., CA (United States)
  6. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing Key Lab. for New Energy Materials and Devices
  7. 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

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