Alkali-ion batteries, including potassium-ion batteries, lithium-ion batteries, and sodium-ion batteries are important energy storage devices; however, with the cation size increased, there exists a great challenge for an inorganic electrode material to accommodate the different properties of the alkaliion. Herein, as a proof-of-concept experiment, an imine-rich poly(o-phenylenediamine) (PoPD) is synthesized through a rational controllable oxidization. Due to the abundance of active sites and ladderconjugated structure, PoPD in the optimized oxidation state endows alkali-ion batteries with a stable cyclability at high capacity. The highly reversible redox performance of PoPD with alkali-ions is verified by theoretical calculations and demonstrated as a trifunctional electrode material (537 and 307 mAh·g−1 for Li and Na storage capacity after 300 cycles, respectively), especially for successful application in potassium storage (450 mAh·g−1 after 205 cycles), and provides compelling evidence for the wide application of organic electrode materials.

中文翻译：

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富含亚胺的聚（邻苯二胺）作为用于碱性离子电池的高容量三功能有机电极

碱离子电池，包括钾离子电池，锂离子电池和钠离子电池是重要的能量存储设备；然而，随着阳离子尺寸的增加，无机电极材料要适应碱化的不同性质存在很大的挑战。本文中，作为概念验证实验，通过合理可控的氧化合成了富含亚胺的聚（邻苯二胺）（PoPD）。由于具有丰富的活性位点和梯形共轭结构，处于最佳氧化态的PoPD可为碱离子电池提供高容量的稳定循环能力。