10-Methylphenothiazine- and Thianthrene-functionalised Polymers As Organic Cathode Materials In Dual-Ion Batteries

Basic data for this talk

Information about the event

Abstract

Electrochemically active organic electrode materials are studied since the early 1970s.[1,2] Depending on the choice of the organic components, like polymers or free molecules, they are sustainable, have fast kinetics (high rate capabilities) and show long cycling stability.[3,4] However, most of the molecules used as redox active materials are soluble in common organic solvents and have low specific energy. In terms of increasing the specific energy, we focused on the investigation of organic materials with high working potentials.[5,6] Subsequently, this work presents organic cathode materials with oxidation potentials above 4.1 V vs. Li/Li+. The electrochemically active components are 10-methylphenothiazine (MPT) and thianthrene (Th), which are immobilised as functional groups in the side chain of a vinyl-based polymer backbone. The two polymers, poly(VMPT) (MPT-functionalised) and poly(VTh) (Th-functionalised) are shown in Figure 1. The general working principle of these polymers will be discussed and the categorisation to be a "dual-ion" system[7] will be clarified. Electrochemical and mechanistic investigations (including UV/Vis, IR and MAS NMR spectroscopy) will be presented facing questions for the redox behaviour and long-term cycling performance.

Speakers from the University of Münster

Kolek, Martin

Institute of Physical Chemistry