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Quantifying the Capacity Contributions during Activation of Li2MnO3

Journal Article · · ACS Energy Letters
 [1];  [2];  [3];  [3];  [2];  [4];  [5];  [6];  [4];  [7];  [2];  [3]
  1. Binghamton Univ., NY (United States); Binghamton University
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Binghamton Univ., NY (United States)
  4. Binghamton Univ., NY (United States). NorthEast Center for Chemical Energy Storage (NECCES)
  5. Univ. of Muenster (Germany). MEET Battery Research Center, Institute of Physical Chemistry
  6. Helmholtz-Institute Muenster (Germany)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
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Though Li2MnO3 was originally considered to be electrochemically inert, its observed activation has spawned a new class of Li-rich layered compounds that deliver capacities beyond the traditional transition-metal redox limit. Despite progress in our understanding of oxygen redox in Li-rich compounds, the underlying origin of the initial charge capacity of Li2MnO3 remains hotly contested. To resolve this issue, we review all possible charge compensation mechanisms including bulk oxygen redox, oxidation of Mn4+, and surface degradation for Li2MnO3 cathodes displaying capacities exceeding 350 mAh g–1. Using elemental and orbital selective X-ray spectroscopy techniques, we rule out oxidation of Mn4+ and bulk oxygen redox during activation of Li2MnO3. Quantitative gas-evolution and titration studies reveal that O2 and CO2 release accounted for a large fraction of the observed capacity during activation with minor contributions from reduced Mn species on the surface. Lastly, these studies reveal that, although Li2MnO3 is considered critical for promoting bulk anionic redox in Li-rich layered oxides, Li2MnO3 by itself does not exhibit bulk oxygen redox or manganese oxidation beyond its initial Mn4+ valence.
Research Organization:
Binghamton Univ., NY (United States); Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; SC0012583; SC0012704
OSTI ID:
1596994
Alternate ID(s):
OSTI ID: 1690021
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 2 Vol. 5; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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