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

Oluseun Akintola; Patrick Gerlach; Christian T Plass; Andrea Balducci; Winfried Plass

doi:10.3389/fchem.2022.836325

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

Front Chem. 2022 Mar 4:10:836325. doi: 10.3389/fchem.2022.836325. eCollection 2022.

Authors

Oluseun Akintola¹, Patrick Gerlach^{2

3}, Christian T Plass⁴, Andrea Balducci^{2

3}, Winfried Plass¹

Affiliations

¹ Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Jena, Germany.
² Institut für Technische Chemie und Umweltchemie, Friedrich-Schiller-Universität Jena, Jena, Germany.
³ Center for Energy and Environmental Chemistry Jena (CEEC Jena), Jena, Germany.
⁴ Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Jena, Germany.

Abstract

In this study we report on the characterization and use of the anionic metal-organic framework (MOF) JUMP-1, [(Me₂NH₂)₂[Co₃(ntb)₂(bdc)]] _n , 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^-1 vs. 164 mA∙h∙g^-1 and 83 mA∙h∙g^-1 vs. 73 mA∙h∙g^-1 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.

Keywords: anionic-MOF; batteries; cation exchange; insertion; lithium; sodium.