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NaxCoO2 phase stability and hierarchical orderings in the O3/P3 structure family

Journal Article · · Physical Review Materials
 [1];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)

The operation of Na-ion batteries is closely linked to the occurrence of phase transitions and Na ordering within the electroactive materials of their electrodes. Here, we performed a first-principles study of NaxCoO2 (0 ≤ x ≤ 1) to establish phase stability among O3, P3, O1, and staged hybrid O1-O3 host structures and to determine low-energy Na orderings within each host. We predict several staircases of ground-state orderings, many of which are found to remain ordered at room temperature. At high Na content, the ground states belong to a family of vacancy row orderings in O3 with distorted CoO2 layers. In P3, where the available Na sites form a honeycomb network, we discover three families of hierarchical ground-state orderings at intermediate compositions that essentially consist of domains of the x = 1/2 ground state periodically separated by antiphase boundaries. Our results agree with the experimentally reported voltage profile and the observed changes in stacking sequence with Na concentration.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Synthetic Control Across Length-scales for Advancing Rechargeables (SCALAR); 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); National Science Foundation (NSF)
Grant/Contract Number:
FG02-97ER25308; SC0019381; AC02-05CH11231
OSTI ID:
1544136
Alternate ID(s):
OSTI ID: 1490505
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 1 Vol. 3; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Beyond Expert‐Level Performance Prediction for Rechargeable Batteries by Unsupervised Machine Learning journal October 2019
Reciprocal space imaging of ionic correlations in intercalation compounds journal October 2019
Developing an O3 type layered oxide cathode and its application in 18650 commercial type Na-ion batteries journal January 2019
Understanding intercalation compounds for sodium-ion batteries and beyond
  • Kaufman, Jonas L.; Vinckevičiūtė, Julija; Krishna Kolli, Sanjeev
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2152 https://doi.org/10.1098/rsta.2019.0020
journal July 2019
Reciprocal Space Imaging of Ionic Correlations in Intercalation Compounds text January 2019

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