AUTHOR=Akintola Oluseun , Gerlach Patrick , Plass Christian T. , Balducci Andrea , Plass Winfried 

TITLE=Enhancing Capacity and Stability of Anionic MOFs as Electrode Material by Cation Exchange

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.836325

DOI=10.3389/fchem.2022.836325

ISSN=2296-2646

ABSTRACT=<p>In this study we report on the characterization and use of the anionic metal-organic framework (MOF) JUMP-1, [(Me<sub>2</sub>NH<sub>2</sub>)<sub>2</sub>[Co<sub>3</sub>(ntb)<sub>2</sub>(bdc)]]<sub><italic>n</italic></sub>, alongside with its alkali-metal ion-exchanged analogs JUMP-1(Li) and JUMP-1(Na), as electrode materials for lithium and sodium batteries. Composite electrodes containing these anionic-MOFs were prepared and tested in 1 M lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) in propylene carbonate (PC) and/or 1 M sodium TFSI (NaTFSI) in PC. We showed that the ion-exchanged materials JUMP-1(Li) and JUMP-1(Na) display higher capacities in comparison with the original as-prepared compound JUMP-1 (490 mA∙h∙g<sup>−1</sup> vs. 164 mA∙h∙g<sup>−1</sup> and 83 mA∙h∙g<sup>−1</sup> vs. 73 mA∙h∙g<sup>−1</sup> in Li and Na based electrolytes, respectively). Additionally, we showed that the stability of the electrodes containing the ion-exchanged materials is higher than that of JUMP-1, suggesting a form of chemical pre-alkalation works to stabilize them prior to cycling. The results of these studies indicate that the use of designed anionic-MOFs represents a promising strategy for the realization of high performance electrodes suitable for energy storage devices.</p>