SKM 2023 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 16: Energy Conversion
MM 16.1: Talk
Tuesday, March 28, 2023, 10:15–10:30, SCH A 215
Spins at Work: Probing Charging and Discharging of Organic Radical Batteries by Electron Paramagnetic Resonance Spectroscopy — •Ilia Kulikov1, Naitik Panjwani1, Anatoliy Vereshchagin2, Domenik Spallek1, Daniil Lukianov2, Elena Alexeeva2, Oleg Levin1, and Jan Behrends1 — 1Berlin Joint EPR Lab, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin — 2St. Petersburg, 199034, Russian Federation
We report on the development of an operando setup for spectroelectrochemical Electron Paramagnetic Resonance (EPR) measurements on redox conductive polymers for organic radical batteries. [1]
Quantitative EPR experiments performed on electrochemical cells with a TEMPO containing polymer cathode demonstrate a strong decrease in the number of paramagnetic centres upon oxidation. [2] The distinct EPR signatures of the polymer are used to study its degradation upon repeated cycling. A comparison between the EPR and electrochemical data is used to monitor the degradation process.
Low-temperature ex-situ pulse EPR measurements on an oxidized cathode film reveal a spectrum of dilute nitroxide species, which indicates formation of electrochemically inactive islands. These experiments pave the way for studying organic radical battery materials by advanced EPR techniques.
[1] I. Kulikov et al., Energy and Environmental Science, 2022, 15, 3275.
[2] A. A. Vereshchagin et al., Batteries & Supercaps 2021, 4, 336.