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Surface Structure, Morphology, and Stability of Li(Ni1/3Mn1/3Co1/3)O2 Cathode Material

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [3];  [3];  [4];  [2];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Division
  4. Univ. of Wisconsin, Madison, WI (United States)

Layered Li(Ni1-x-yMnxCoy)O2 (NMC) oxides are promising cathode materials capable of addressing some of the challenges associated with next-generation energy storage devices. In particular, improved energy densities, longer cycle-life, and improved safety characteristics with respect to current technologies are needed. However, sufficient knowledge on the atomic-scale processes governing these metrics in working cells is still lacking. Herein, Density Functional Theory (DFT) is employed to predict the stability of several low-index surfaces of Li(Ni1/3Mn1/3Co1/3)O2 (NMC111) as a function of Li and O chemical potentials. Predicted particle shapes are compared with those of single crystal NMCs synthesized under different conditions. The most stable surfaces for stoichiometric NMC111 are predicted to be the non-polar (104), the polar (012) and (001), and the reconstructed, polar (110) surfaces. Results indicate that intermediate spin Co3+ ions lower the (104) surface energy. Furthermore, it was found that removing oxygen from the (012) surface was easier than from the (104) surface, suggesting a facet dependence on surface-oxygen vacancy formation. In conclusion, these results give important insights into design criteria for the rational control of synthesis parameters as well as establish a foundation on which future, mechanistic studies of NMC surface instabilities can be developed.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1352891
Alternate ID(s):
OSTI ID: 1379813
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 15 Vol. 121; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Correlation between manganese dissolution and dynamic phase stability in spinel-based lithium-ion battery journal October 2019
The Unified Electrochemical Band Diagram Framework: Understanding the Driving Forces of Materials Electrochemistry journal August 2018
Kinetics‐Controlled Degradation Reactions at Crystalline LiPON/Li x CoO 2 and Crystalline LiPON/Li‐Metal Interfaces journal March 2018
Pushing the limit of layered transition metal oxide cathodes for high-energy density rechargeable Li ion batteries journal January 2018
Single-crystal based studies for correlating the properties and high-voltage performance of Li[Ni x Mn y Co 1−x−y ]O 2 cathodes journal January 2019
The effects of mechanical constriction on the operation of sulfide based solid-state batteries journal January 2019
Decomposition of Phosphorus-Containing Additives at a Charged NMC Surface through Potentiostatic Holds journal January 2019
Kinetics-Controlled Degradation Reactions at Crystalline LiPON/Li(x)CoO(2) and Crystalline LiPON/Li-metal Interfaces text January 2018

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