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Title: Calibrating transition-metal energy levels and oxygen bands in first-principles calculations: Accurate prediction of redox potentials and charge transfer in lithium transition-metal oxides

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering; Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division

Transition-metal (TM) oxides play an increasingly important role in technology today, including applications such as catalysis, solar energy harvesting, and energy storage. In many of these applications, the details of their electronic structure near the Fermi level are critically important for their properties. We propose a first-principles–based computational methodology for the accurate prediction of oxygen charge transfer in TM oxides and lithium TM (Li-TM) oxides. To obtain accurate electronic structures, the Heyd-Scuseria-Ernzerhof (HSE06) hybrid functional is adopted, and the amount of exact Hartree-Fock exchange (mixing parameter) is adjusted to reproduce reference band gaps. We show that the HSE06 functional with optimal mixing parameter yields not only improved electronic densities of states, but also better energetics (Li-intercalation voltages) for LiCoO2 and LiNiO2 as compared to the generalized gradient approximation (GGA), Hubbard U corrected GGA (GGA + U), and standard HSE06. We find that the optimal mixing parameters for TM oxides are system specific and correlate with the covalency (ionicity) of the TM species. The strong covalent (ionic) nature of TM-O bonding leads to lower (higher) optimal mixing parameters. We find that optimized HSE06 functionals predict stronger hybridization of the Co 3d and O 2p orbitals as compared to GGA, resulting in a greater contribution from oxygen states to charge compensation upon delithiation in LiCoO2. We also find that the band gaps of Li-TM oxides increase linearly with the mixing parameter, enabling the straightforward determination of optimal mixing parameters based on GGA (α = 0.0) and HSE06 (α = 0.25) calculations. Our results also show that G0 W0 @ GGA + U band gaps of TM oxides ( M O , M = Mn , Co , Ni ) and LiCoO2 agree well with experimental references, suggesting that G0 W0 calculations can be used as a reference for the calibration of the mixing parameter in cases when no experimental band gap has been reported.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE; National Research Foundation of Korea (NRF)
Grant/Contract Number:
FG02-96ER45571
OSTI ID:
1505755
Alternate ID(s):
OSTI ID: 1214339
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 11; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 127 works
Citation information provided by
Web of Science

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Cited By (15)

Understanding and Controlling the Work Function of Perovskite Oxides Using Density Functional Theory journal May 2016
Anionic Redox in Rechargeable Lithium Batteries journal June 2017
Controllable Cathode–Electrolyte Interface of Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 for Lithium Ion Batteries: A Review journal August 2019
Evolutionary Algorithm‐Based Crystal Structure Prediction for Copper(I) Fluoride journal August 2019
Importance of one-parameter hybrid exchange-correlation functionals in band gaps of transition metal and metalloid oxides journal February 2018
The structural and chemical origin of the oxygen redox activity in layered and cation-disordered Li-excess cathode materials journal May 2016
Computational understanding of Li-ion batteries journal March 2016
Systematic beyond-DFT study of binary transition metal oxides journal November 2019
Metal–oxygen decoordination stabilizes anion redox in Li-rich oxides journal February 2019
Reversible Mn2+/Mn4+ double redox in lithium-excess cathode materials journal April 2018
Origin of structural stability of ScH 3 molecular nanowires and their chemical-bonding behavior: Correlation effects of the Sc 3d electrons journal May 2019
Electrochemical trapping of metastable Mn 3+ ions for activation of MnO 2 oxygen evolution catalysts journal May 2018
Unraveling the Effects of Al Doping on the Electrochemical Properties of LiNi 0.5 Co 0.2 Mn 0.3 O 2 Using First Principles journal January 2017
Understanding and controlling the work function of perovskite oxides using Density Functional Theory text January 2016
Influence of magnetic ordering on the spectral properties of binary transition metal oxides text January 2019

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