This title appears in the Scientific Report :
2019
Please use the identifier:
http://dx.doi.org/10.1149/2.0681903jes in citations.
Please use the identifier: http://hdl.handle.net/2128/23499 in citations.
Reversible Anion Storage in a Metal-Organic Framework for Dual-Ion Battery Systems
Reversible Anion Storage in a Metal-Organic Framework for Dual-Ion Battery Systems
Metal-organic frameworks (MOFs) exhibit a crystalline structure composed of well-dispersed metal centers separated by organic linker molecules. The aim of this work is to understand and utilize the redox-activity of the metal ion nodes and organic linker molecules in order to employ MOFs in the fiel...
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Personal Name(s): | Dühnen, Simon (Corresponding author) |
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Nölle, Roman / Wrogemann, Jens / Winter, Martin (Corresponding author) / Placke, Tobias | |
Contributing Institute: |
Helmholtz-Institut Münster Ionenleiter für Energiespeicher; IEK-12 |
Published in: | Journal of the Electrochemical Society, 166 (2019) 3, S. A5474 - A5482 |
Imprint: |
Pennington, NJ
Electrochemical Soc.
2019
|
DOI: |
10.1149/2.0681903jes |
Document Type: |
Journal Article |
Research Program: |
Electrochemical Storage |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/23499 in citations.
Metal-organic frameworks (MOFs) exhibit a crystalline structure composed of well-dispersed metal centers separated by organic linker molecules. The aim of this work is to understand and utilize the redox-activity of the metal ion nodes and organic linker molecules in order to employ MOFs in the field of battery applications. In this study, a copper-based MOF has been synthesized with a radical anionic linker using 7,7,8,8-tetracyanoquinodimethane (TCNQ). The Cu(TCNQ) MOF shows a reversible reaction with PF6− anions of the electrolyte when applied as positive electrode material in a lithium metal cell. Cyclic voltammetry and constant current cycling studies reveal a different capacity retention behavior depending on the potential range of charge/discharge cycles. In situ X-ray diffraction and ex situ X-ray photoelectron spectroscopy measurements indicate that Cu(TCNQ) undergoes a conversion reaction with the PF6− anions going along with the formation of a new crystalline phase at a potential of 3.75 V vs. Li/Li+. The observed reversible storage of anions might open a new door for the application of MOFs as anion host material for dual-ion batteries. As a result of this work, for dual-ion batteries, two classes of cathode materials have to be regarded in the future, “conversion” and “insertion” materials. |