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      Operando Nanobeam Diffraction to Follow the Decomposition of Individual Li2O2 Grains in a Nonaqueous Li-O2 Battery.

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          Abstract

          Intense interest in the Li-O2 battery system over the past 5 years has led to a much better understanding of the various chemical processes involved in the functioning of this battery system. However, detailed decomposition of the nanostructured Li2O2 product, held at least partially responsible for the limited reversibility and poor rate performance, is hard to measure operando under realistic electrochemical conditions. Here, we report operando nanobeam X-ray diffraction experiments that enable monitoring of the decomposition of individual Li2O2 grains in a working Li-O2 battery. Platelet-shaped crystallites with aspect ratios between 2.2 and 5.5 decompose preferentially via the more reactive (001) facets. The slow and concurrent decomposition of individual Li2O2 crystallites indicates that the Li2O2 decomposition rate limits the charge time of these Li-O2 batteries, highlighting the importance of using redox mediators in solution to charge Li-O2 batteries.

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          Author and article information

          Journal
          J Phys Chem Lett
          The journal of physical chemistry letters
          American Chemical Society (ACS)
          1948-7185
          1948-7185
          Sep 01 2016
          : 7
          : 17
          Affiliations
          [1 ] Department of Radiation Science and Technology, Delft University of Technology , Mekelweg 15, 2629JB Delft, The Netherlands.
          [2 ] Department of Chemistry and the Waterloo Institute for Nanotechnology, University of Waterloo , Waterloo, Ontario N2L 3G1, Canada.
          [3 ] Kavli Institute of Nanoscience Delft, Department of Quantum Nanoscience, Delft University of Technology , Lorentzweg 1, 2628CJ Delft, The Netherlands.
          [4 ] European Synchrotron Radiation Facility , 6 rue Jules Horowitz, BP 220, 38043 Grenoble Cedex, France.
          Article
          10.1021/acs.jpclett.6b01368
          27516071
          7f9ba9b8-0183-4c71-bed1-b1d0ffc0bd98
          History

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