Origin of Phase Separation in Ni-Rich Layered Oxide Cathode Materials During Electrochemical Cycling
Journal Article
·
· Chemistry of Materials
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Stony Brook University, NY (United States)
- Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Stony Brook University, NY (United States)
In intercalation materials, the kinetics and uniformity of mass transport across the nanocrystalline domains dictate the structural reversibility and transport capability at the macroscopic level. (De)intercalation-induced interlayer disintegrations exhibit anisotropic crystallite size change. Due to the anisotropic mass transport mechanism, separated phases are inherently crystallographically oriented. One such material is LiNi$1–x–y$Mn$$x$$Co$$y$$O2, which plays a pivotal role in advanced Li-ion batteries but suffers from severe phase inhomogeneities under fast charge or electrochemical aging. Here, using operando synchrotron techniques, we probe the mechanistic origins of the compositional and orientational-dependent phase separations during the electrochemical cycling of LiNi0.8Mn0.1Co0.1O2 by comprehensive analysis of both in-plane and out-of-plane reflections. In the H2/H3 phase regime, in-plane domain propagation occurs due to increased covalency despite the severe decay of interlayer crystallographic order, resulting in the change of crystalline domain shape from 3D spheres to two-dimensional nanosheets. The crystallographically selective XRD line splitting is linked to the geometry of the facets as mass transfers along the ab plane. In conclusion, this work provides mechanistic insights into crystallographic orientation-dependent phase inhomogeneity under fast charge and extended cycling.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- DEVCOM Army Research Laboratory (ARL); New York State Energy Research and Development Authority (NYSERDA); New York State Department of Economic Development (DED); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- SC0012673; SC0012704
- OSTI ID:
- 2246889
- Report Number(s):
- BNL--225103-2023-JAAM
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 21 Vol. 35; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Degradation in Ni-Rich LiNi1–x–yMnxCoyO2/Graphite Batteries: Impact of Charge Voltage and Ni Content
A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode
Journal Article
·
Wed Apr 05 20:00:00 EDT 2023
· Journal of Physical Chemistry. C
·
OSTI ID:1984421
A Comprehensive Understanding of the Aging Effects of Extreme Fast Charging on High Ni NMC Cathode
Journal Article
·
Thu Apr 21 20:00:00 EDT 2022
· Advanced Energy Materials
·
OSTI ID:1867583