3,6-Diphenyltetrazine as Cathode Active Material for Sodium Ion Batteries

3,6-diphenyltetrazine (DPT) is an electron-deficient pi-conjugated molecule with a perfectly planar structure and high crystallinity. In this study, discharge-charge tests of crystalline DPT as a cathode material for sodium ion batteries were conducted. DPT showed an initial reversible capacity of 102 mAh/g (theoretical capacity 114 mAh/g), corresponding to one electron reaction. The plateau of the discharge-charge profiles was observed at 1.9-2.1 V vs. Na/Na+. According to the ex-situ XRD, FT-IR, and XPS measurements to investigate the discharge-charge mechanism, the redox center was identified as the conjugated tetrazine ring. DPT was in a crystalline form in both the charged and discharged state and indicated the potential as a reversible Na ion host.(c) The Author(s) 2022. Published by ECSJ. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium provided the original work is properly cited. [DOI: 10.5796/electrochemistry.22-00100].

Automated summary

In this study, the discharge-charge performance of DPT as a cathode material for sodium ion batteries was investigated. DPT exhibited high reversible capacity and stable discharge-charge profiles, indicating its potential as a sodium ion host.