Dihydrophenazine‐Based Copolymers as Promising Cathode Materials for Dual‐Ion Batteries,Energy Technology

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Dihydrophenazine‐Based Copolymers as Promising Cathode Materials for Dual‐Ion Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2020-11-04 , DOI: 10.1002/ente.202000772
Filipp A. Obrezkov ₁ , Anna I. Somova _{1,

2} , Elena S. Fedina _{1,

2} , Sergey G. Vasil'ev ₃ , Keith J. Stevenson ₁ , Pavel A. Troshin _{1,

3}

Affiliation

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.

中文翻译：

二氢吩嗪基共聚物是双离子电池的理想阴极材料

在此，合成了二氢吩嗪与二苯胺（PDPAPZ）和吩噻嗪（PPTZPZ）的两种新型共聚物，并将其用作双离子电池的正极材料。两种聚合物在锂电池中均显示出较高的平均放电电势（3.5–3.6 V）。所述PDPAPZ //栗细胞表现令人印象深刻的速率能力：101和82毫安克的比容量^-1被恒电流充电下达成，并在5和20甲克高电流密度放电^-1，分别。在100和25,000次循环后，容量保持率分别为86％和34％，具有良好的电池运行稳定性。此外，令人鼓舞的398 Wh kg ^-1能量密度在钾PDPAPZ // K细胞中实现。获得的值使PDPAPZ与用于快速锂和钾电池的最佳有机阴极材料相当。

更新日期：2021-01-05

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