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Title: Correlating Local Structure with Electrochemical Activity in Li2MnO3

Journal Article · · Journal of Physical Chemistry. C
 [1];  [2];  [2];  [2];  [2];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Li2MnO3 is of interest as one component of the composite lithium-rich oxides, which are under development for high capacity, high voltage cathodes in lithium ion batteries. Despite such practical importance, the mechanism of electrochemical activity in Li2MnO3 is contested in the literature, as are the effects of long-term electrochemical cycling. Here, Raman spectroscopy and mapping are used to follow the chemical and structural changes that occur in Li2MnO3. Both conventional slurry electrodes and thin films are studied as a function of the state of charge (voltage) and cycle number. Thin films have similar electrochemical properties as electrodes prepared from slurries, but allow for spectroscopic investigations on uniform samples without carbon additives. Spectral changes correlate well with electrochemical activity and support a mechanism whereby capacity is lost upon extended cycling due to the formation of new manganese oxide phases. Raman mapping of both thin film and slurry electrodes charged to different voltages reveals significant variation in the local structure. Poor conductivity and slow kinetics associated with a two-phase reaction mechanism contribute to the heterogeneity.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1210144
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 32; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Simply Constructing Li 1.2 Mn 0.6 Ni 0.2 O 2 /C Composites for Superior Electrochemical Performance and Thermal Stability in Li-Ion Battery journal December 2018
Applications of Conventional Vibrational Spectroscopic Methods for Batteries Beyond Li-Ion journal March 2018
Direct observation of layered-to-spinel phase transformation in Li 2 MnO 3 and the spinel structure stabilised after the activation process journal January 2017
Composite-Structure Material Design for High-Energy Lithium Storage journal July 2018