Polymeric aromatic amines were shown to be very promising cathodes for lithium-ion batteries. Surprisingly, these materials are scarcely used for designing post-lithium batteries. In this Letter, we investigate the application of the high-voltage poly(N-phenyl-5,10-dihydrophenazine) (p-DPPZ) cathodes for Kion batteries. The designed batteries demonstrate an impressive specific capacity of 162 mAh g −1 at the current density of 200 mA g −1 , operate efficiently at high current densities of 2−10 A g −1 , enabling charge and discharge within ∼1−4 min, and deliver the specific capacity of 125−145 mAh g −1 with a retention of 96 and 79% after 100 and 1000 charge−discharge cycles, respectively. Finally, these K-ion batteries with polymeric p-DPPZ cathodes showed rather outstanding specific power of >3 × 10 4 W kg −1 , thus paving a way to the design of ultrafast and durable high-capacity metalion batteries matching the increasing demand for high power and high energy density electrochemical energy storage devices.

Metal-free environmentally friendly polyamine-basedPDPPDcathodes delivered promising capacities and impressive rate capabilities (>100C) in Li, Na and K batteries.

Recent efficiency records of organic photovoltaics (OPV) highlight stability as a limiting weakness. Incorporation of stabilizers is a desirable approach for inhibiting degradationit is inexpensive and readily up-scalable. However, to date, such additives have had limited success. We show that β-carotene (BC), an inexpensive and green, naturally occurring antioxidant, dramatically improves OPV stability. When compared to nonstabilized reference devices, the accumulated power generation of PTB7:[70]­PCBM devices in the presence of BC increases by an impressive factor of 6, due to stabilization of both the burn-in and the lifetime, and by a factor of 21 for P3HT:[60]­PCBM devices, owing to a longer lifetime. Using electron spin resonance and time-resolved near-IR emission spectroscopies, we probed radical and singlet oxygen concentrations. We demonstrate that singlet oxygen sensitized by [70]­PCBM causes the “burn-in” of PTB7:[70]­PCBM devices and that BC effectively mitigates it. Our results provide an effective solution to the problem that currently limits widespread use of OPV.

Herein, two novel copolymers of dihydrophenazine with diphenylamine (PDPAPZ) and phenothiazine (PPTZPZ) are synthesized and investigated as cathode materials for dual‐ion batteries. Both polymers demonstrate high average discharge potentials (3.5–3.6 V) in lithium cells. The PDPAPZ//Li cells demonstrate impressive rate capability: specific capacities of 101 and 82 mAh g−1 are reached under galvanostatic charging and discharging at the high current densities of 5 and 20 A g−1, respectively. The capacity retention of 86% and 34% after 100 and 25 000 cycles, respectively, features decent operational stability of the batteries. Furthermore, an encouraging energy density of 398 Wh kg−1 is achieved in potassium PDPAPZ//K cells. The obtained values place PDPAPZ on par with the best organic cathode materials for fast lithium and potassium batteries.

Polydiphenylamine (PDPA)-based cathodes exhibited record energy densities among all known polymer-based cathodes for dual-ion batteries.