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Title: Asymmetric pathways in the electrochemical conversion reaction of NiO as battery electrode with high storage capacity

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep07133· OSTI ID:1256044
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [5];  [8]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Univ. of Illinois, Chicago, IL (United States)
  5. Univ. of Saskatchewan, Saskatoon, SK (Canada)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Nanyang Technological Univ. (Singapore)
  7. Nanyang Technological Univ. (Singapore)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Illinois, Chicago, IL (United States)

Electrochemical conversion reactions of transition metal compounds create opportunities for large energy storage capabilities exceeding modern Li-ion batteries. However, for practical electrodes to be envisaged, a detailed understanding of their mechanisms is needed, especially vis-à-vis the voltage hysteresis observed between reduction and oxidation. Here, we present such insight at scales from local atomic arrangements to whole electrodes. NiO was chosen as a simple model system. The most important finding is that the voltage hysteresis has its origin in the differing chemical pathways during reduction and oxidation. This asymmetry is enabled by the presence of small metallic clusters and, thus, is likely to apply to other transition metal oxide systems. Lastly, the presence of nanoparticles also influences the electrochemical activity of the electrolyte and its degradation products and can create differences in transport properties within an electrode, resulting in localized reactions around converted domains that lead to compositional inhomogeneities at the microscale.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
1256044
Journal Information:
Scientific Reports, Vol. 4; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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A critical review-promises and barriers of conversion electrodes for Li-ion batteries journal April 2017
Nickel oxide nanocrystals as a lithium-ion battery anode: structure-performance relationship journal April 2016
Interconnected mesoporous NiO sheets deposited onto TiO 2 nanosheet arrays as binder-free anode materials with enhanced performance for lithium ion batteries journal January 2015
Pushing the theoretical capacity limits of iron oxide anodes: capacity rise of γ-Fe 2 O 3 nanoparticles in lithium-ion batteries journal January 2016
Facile synthesis of perovskite CeMnO 3 nanofibers as an anode material for high performance lithium-ion batteries journal January 2019
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Transition Metal Oxide Anodes for Electrochemical Energy Storage in Lithium‐ and Sodium‐Ion Batteries text January 2020