Novel highly conductive cathode material based on stable-radical organic framework and polymerized nickel complex for electrochemical energy storage devices

The Fast and the Capacious: A [Ni(Salen)]‐TEMPO Redox‐Conducting Polymer for Organic Batteries

“…Operando electronic conductance of p‐DiTS films was studied using interdigitated electrodes with a bipotentiostat in CV mode. The dependence of the p‐DiTS conductance on the applied potential was found to be typical for NiSalens [20] and other conductive polymers, [33] showing a narrow conductivity window with a peak conductivity of 1.75 mSm at 0.55 V. This value is more than 3 orders of magnitude higher than the value beyond the conductivity window (ca. 10 μSm) (Figure 5D).…”

“…Such a high conductivity value surpasses the conductance of aliphatic TEMPO‐based polymers, such as PTMA, by almost two orders of magnitude. The conductance of p‐DiTS thus approaches the conductance of NiSalen polymers measured under identical conditions [20,34] …”

“…The CV of DiTS (Figure 2A) shows the paired peaks A and A’ at 0.55 V and 0.47 V respectively, which correspond to charging and discharging of the nitroxyl fragments. An irreversible anodic peak B corresponds to oxidative coupling of the NiSalen fragments of DiTS, which results in the polymer p‐DiTS [20–21] . The gradual increase of the CV current and the electrode mass (Figure 2A) in the subsequent cycles indicates the course of the polymerization process.…”

“…Based on the above knowledge, we suggest that using NiSalen type polymer complexes as a conductive polymer framework for TEMPO‐containing materials of lithium‐ion batteries is a new and promising approach on the route towards the design of organic cathodes with high conductivity and specific capacity. Recently the evidence of the synergistic action of polymeric NiSalen with the nitroxyl polymer PTMA in a composite has been demonstrated, indicating the prospective of such a class of conducting polymers for energy purposes [20] …”

Aryl‐Aryl Coupling of Salicylic Aldehydes through Oxidative CH‐activation in Nickel Salen Derivatives

“…Electrochemical oxidation of nickel complexes of bis‐imines of salicylic aldehyde derivatives, referred to as NiSalens, leads to electroactive polymers which are admired for their energy storage performance, electrochromic and electrocatalytic properties. Except some specific cases, polymerization of NiSalens occurs through the formation of C−C bonds in the para ‐positions to the hydroxyl group of the phenyl rings of the ligand, which provides a new route to biphenyl compounds.…”