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Title: Structural and Chemical Evolution of the Layered Li-Excess LixMnO3 as a Function of Li Content from First-Principles Calculations

Journal Article · · Advanced Energy Materials
 [1];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Li2MnO3 is a critical component in the family of "Li-excess" materials, which are attracting attention as advanced cathode materials for Li-ion batteries. Here, first-principle calculations are presented to investigate the electrochemical activity and structural stability of stoichiometric LixMnO3 (0 ≤ x ≤ 2) as a function of Li content. The Li2MnO3 structure is electrochemically activated above 4.5 V on delithiation and charge neutrality in the bulk of the material is mainly maintained by the oxidization of a portion of the oxygen ions from O2- to O1-. While oxygen vacancy formation is found to be thermodynamically favorable for x < 1, the activation barriers for O2- and O1- migration remain high throughout the Li composition range, impeding oxygen release from the bulk of the compound. Defect layered structures become thermodynamically favorable at lower Li content (x < 1), indicating a tendency towards the spinel-like structure transformation. A critical phase transformation path for forming nuclei of spinel-like domains within the matrix of the original layered structure is proposed. Formation of defect layered structures during the first charge is shown to manifest in a depression of the voltage profile on the first discharge, providing one possible explanation for the observed voltage fade of the Li-excess materials.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Vehicle Technologies Office (VTO)
DOE Contract Number:
AC02-05CH11231
OSTI ID:
1511383
Journal Information:
Advanced Energy Materials, Vol. 4, Issue 15; ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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