Affiliation:
1. Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale del Risorgimento 4 Bologna 40136 Italy
2. Helmholtz Institute Ulm (HIU) Helmholtzstrasse 11 89081 Ulm Germany
3. Karlsruhe Institute of Technology (KIT) P.O. Box 3640 76021 Karlsruhe Germany
4. ALBA Synchrotron Light Source Carrer de la Llum 2–26 Cerdanyola del Vallés 08290 Spain
5. Institut de Ciència de Materials de Barcelona Consejo Superior de Investigaciones Científicas (ICMAB‐CSIC) Campus UAB Bellaterra Cerdanyola del Vallès 08193 Spain
6. Department of Chemistry Sapienza University of Rome P.le A. Moro 5 Rome 00185 Italy
Abstract
AbstractManganese hexacyanoferrate is a promising cathode material for lithium and sodium ion batteries, however, it suffers of capacity fading during the cycling process. To access the structural and functional characteristics at the nanometer scale, fresh and cycled electrodes are extracted and investigated by transmission soft X‐ray microscopy, which allows chemical characterization with spatial resolution from position‐dependent x‐ray spectra at the Mn L‐, Fe L‐ and N K‐edges. Furthermore, soft X‐rays prove to show superior sensitivity toward Fe, compare to hard X‐rays. Inhomogeneities within the samples are identified, increasing in the aged electrodes, more dramatically in the Li‐ion system, which explains the poorer cycle life as Li‐ion cathode material. Local spectra, revealing different oxidation states over the sample with strong correlation between the Fe L‐edge, Mn L‐edge, and N K‐edge, imply a coupling between redox centers and an electron delocalization over the host framework.
Subject
General Materials Science,General Chemistry
Cited by
3 articles.
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