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DOI: 10.5445/IR/1000078454
Veröffentlicht am 08.01.2018

Structural and Electrochemical Characterization of Zn$_{1-x}$Fe$_{x}$O : Effect of Aliovalent Doping on the Li⁺ Storage Mechanism

Giuli, Gabriele; Eisenmann, Tobias; Bresser, Dominic; Trapananti, Angela; Asenbauer, Jakob; Mueller, Franziska; Passerini, Stefano

Abstract:
In order to further improve the energy and power density of state-of-the-art lithium-ion batteries (LIBs), new cell chemistries and, therefore, new active materials with alternative storage mechanisms are needed. Herein, we report on the structural and electrochemical characterization of Fe-doped ZnO samples with varying dopant concentrations, potentially serving as anode for LIBs (Rechargeable lithium-ion batteries). The wurtzite structure of the Zn1−xFexO samples (with x ranging from 0 to 0.12) has been refined via the Rietveld method. Cell parameters change only slightly with the Fe content, whereas the crystallinity is strongly affected, presumably due to the presence of defects induced by the Fe3+ substitution for Zn2+. XANES (X-ray absorption near edge structure) data recorded ex situ for Zn0.9Fe0.1O electrodes at different states of charge indicated that Fe, dominantly trivalent in the pristine anode, partially reduces to Fe2+ upon discharge. This finding was supported by a detailed galvanostatic and potentiodynamic investigation of Zn1−xFexO-based electrodes, confirming such an initial reduction of Fe3+ to Fe2+ at potentials ... mehr


Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 1996-1944
URN: urn:nbn:de:swb:90-784540
KITopen ID: 1000078454
HGF-Programm 37.01.01; LK 01
Erschienen in Materials
Band 11
Heft 1
Seiten Art.Nr. 49
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte lithium-ion battery, anode, crystal chemistry, electrochemistry
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