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First-principles comparative study of Cr migration in O3 and O/P hybrid-phased NaCrO2

Journal Article · · Physical Review Materials

In layered Na transition-metal (TM) oxides, TM migration usually occurs at highly charged states and severely deteriorates the capacity and reversibility. Meanwhile, the formation of hybrid phases with the intergrowth of octahedral (O-type) and prismatic (P-type) Na layers also takes place at highly charged states. These hybrid phases are often more stable than simple O3 or P3 stackings. However, little is known about the mechanism and impact of TM migration in these hybrid phases. In this work, a comparative first-principles study is performed to understand the connections between structural changes and Cr migration in layered O3 and hybrid-phased NaCrO2. After Cr migration, the hybrid-phased NaCrO2 suffers from greater layer shrinkage than the O3 phase. Three factors affect the Cr migration energy Emig: the Na concentration, local 3D configurations, and 2D in-plane geometries. Low Na concentrations and certain local 3D configurations facilitate the Cr migration. The Cr migration barriers in both O3 and hybrid-phased NaCrO2 are positively correlated with the Cr Emig. The Cr migration in 17 doped O3 and hybrid-phased NaCrO2 is surveyed. In these doped NaCrO2, a more uniform distribution of the Cr–O bond lengths usually suggests suppressed Cr migration. Optimal dopants for suppressing Cr migration are identified by considering Emig for both Cr and the dopant. Finally, our comparative study on Cr migration in O3 and hybrid-phased NaCrO2 reveals the significant role of hybrid-phased structures in the development of layered cathode materials.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1982845
Alternate ID(s):
OSTI ID: 1890011
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 9 Vol. 6; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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