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Insights on the Behavior of Conversion-Based Anode Materials for Fluoride Ion Batteries by Testing against an Intercalation-Based Reference Cathode

Nowroozi, Mohammad Ali and Clemens, Oliver (2018):
Insights on the Behavior of Conversion-Based Anode Materials for Fluoride Ion Batteries by Testing against an Intercalation-Based Reference Cathode.
In: ACS Applied Energy Materials, 1 (11), pp. 6626-6637. ISSN 2574-0962,
DOI: 10.1021/acsaem.8b01630,
[Article]

Abstract

La2CoO4 has been introduced as a promising intercalation-based cathode material for all-solid-state reversible fluoride ion batteries (ASS-FIBs). However, the cycling behavior of cells using La2CoO4 as the cathode material and conversion-based metal/metal fluoride composites as the anode material is still not comparable with the current state of the art of the functional lithium ion batteries. A great part of this capacity fading could originate from the conversion-based anode systems, for which there is a lack of understanding of the fundamental conversion mechanism within an ASS-FIB. In this work, we have focused on investigating different anode composite candidates M-MF2 (X = Pb, Zn, Mn) in order to improve the understanding of the conversion reaction within FIBs. Studies of the electrochemical charging/discharging behaviors and cycling stabilities were combined with impedance spectroscopy analysis and ex-situ X-ray diffraction for the various anode composites against La2CoO4. Furthermore, symmetrical cells made only of the anode composites were examined. By this, the strong impact of volume changes on the conversion reaction within such ASS batteries could be demonstrated; intrinsic physical properties of the metal fluorides were further found to affect the overpotentials of the cell. From the studies performed, it is concluded that the design of elastic electrode composites, which can maintain interface contacts on volume changes, will be required in the future in order to improve the cycling stability of conversion-based electrode systems within ASS-FIBs.

Item Type: Article
Erschienen: 2018
Creators: Nowroozi, Mohammad Ali and Clemens, Oliver
Title: Insights on the Behavior of Conversion-Based Anode Materials for Fluoride Ion Batteries by Testing against an Intercalation-Based Reference Cathode
Language: English
Abstract:

La2CoO4 has been introduced as a promising intercalation-based cathode material for all-solid-state reversible fluoride ion batteries (ASS-FIBs). However, the cycling behavior of cells using La2CoO4 as the cathode material and conversion-based metal/metal fluoride composites as the anode material is still not comparable with the current state of the art of the functional lithium ion batteries. A great part of this capacity fading could originate from the conversion-based anode systems, for which there is a lack of understanding of the fundamental conversion mechanism within an ASS-FIB. In this work, we have focused on investigating different anode composite candidates M-MF2 (X = Pb, Zn, Mn) in order to improve the understanding of the conversion reaction within FIBs. Studies of the electrochemical charging/discharging behaviors and cycling stabilities were combined with impedance spectroscopy analysis and ex-situ X-ray diffraction for the various anode composites against La2CoO4. Furthermore, symmetrical cells made only of the anode composites were examined. By this, the strong impact of volume changes on the conversion reaction within such ASS batteries could be demonstrated; intrinsic physical properties of the metal fluorides were further found to affect the overpotentials of the cell. From the studies performed, it is concluded that the design of elastic electrode composites, which can maintain interface contacts on volume changes, will be required in the future in order to improve the cycling stability of conversion-based electrode systems within ASS-FIBs.

Journal or Publication Title: ACS Applied Energy Materials
Journal volume: 1
Number: 11
Uncontrolled Keywords: fluoride ion batteries, conversion electrodes, intercalation electrodes, La2CoO4, cycling behavior, reaction mechanism of batteries
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
Date Deposited: 04 Jun 2020 09:10
DOI: 10.1021/acsaem.8b01630
Official URL: https://doi.org/10.1021/acsaem.8b01630
Projects: This work was funded by the German Research Foundation within the Emmy Noether program (Grant CL 551/2-1).
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