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Title: Calcium-Iron Oxide as Energy Storage Medium in Rechargeable Oxide Batteries

Rechargeable oxide batteries (ROB) comprise a regenerative solid oxide cell (rSOC) and a storage medium for oxygen ions. A sealed ROB avoids pumping loss, heat loss, and gas purity expenses in comparison with conventional rSOC. However, the iron oxide base storage medium degrades during charging–discharging cycles. In comparison, CaFe 3O 5 has improved cyclability and a high reversible oxygen storage capacity of 22.3 mol%. In this paper, we analyzed the redox mechanism of this compound. After a solid-state synthesis of CaFe 3O 5, we verified the phase composition and studied the redox reaction by means of X-ray diffraction, Mössbauer spectrometry, and scanning electron microscopy. Finally, results show a great potential to operate the battery with this storage material during multiple charging–discharging cycles.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Forschungszentrum Julich GmbH, Julich (Germany). Inst. of Energy and Climate Research (IEK); Julich-Aachen Research Alliance (JARA), Julich (Germany)
  2. Forschungszentrum Julich GmbH, Julich (Germany). Julich Centre for Neutron Science (JCNS). Peter Grunberg Inst. (PGI); Liege Univ. (Belgium). LCIS/GREENMAT. Inst. of Chemistry
  3. Forschungszentrum Julich GmbH, Julich (Germany). Julich Centre for Neutron Science (JCNS). Peter Grunberg Inst. (PGI); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Forschungszentrum Julich GmbH, Julich (Germany). Inst. of Energy and Climate Research (IEK)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 03EK3017
Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 99; Journal Issue: 12; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Forschungszentrum Julich GmbH, Julich (Germany); Julich-Aachen Research Alliance (JARA), Julich (Germany)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); German Federal Ministry of Education and Research (BMBF)
Contributing Orgs:
Liege Univ. (Belgium)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE; solid oxide fuel cell; Mössbauer spectroscopy; iron/iron compounds; electrolysis; Rechargeable oxide battery
OSTI Identifier:
1338567