Redox-active polymers with large charge-storage density are candidates for electrode-active materials in next-generation energy storage devices, due to their swift charge-discharge capabilities and their inherent characteristics of redox reactions that occur without significant structural changes, leading to their highly energy-efficient and durable performance. Here we report poly(diphenanthrenequinone-substituted norbornene) (PQN) as a novel class of organic electrode-active material. A Li coin cell composed of the PQN/carbon composite electrode as the cathode exhibited 2.8 V (V vs. Li/Li+) and great cycle performance maintaining a capacity higher than 100 mAh/g for more than 100 cycles at 60 C (i.e. in 1 min charging and discharging). Among many types of o-quinone-containing polymers for Li-ion batteries reported so far, the present research provides the first example of introducing phenanthrenequinone as the pendant group per repeating unit of polymers, which proved to be especially advantageous in terms of robustness and cyclability by virtue of the fused-ring structure to protect the reactive positions of the o-benzoquinone. We also report that the functional group tolerance against many types of redox-active groups, which we have established for the initiator and the propagating end of norbornene derivatives, apply for the phenanthrenequinone-substituted monomer, giving rise to a reversible redox activity.
具有高电荷存储密度的氧化还原活性聚合物是下一代储能设备中的候选电活性材料,这是因为它们具有快速充放电能力,而且其发生氧化还原反应的固有特性无需显著的结构变化,因而具有高能效和耐用的性能。在此,我们报告了作为一类新型有机电活性材料的聚(二
菲蒽醌-取代
降冰片烯)(PQN)。以 PQN/碳复合电极为阴极的
锂纽扣电池在 60 摄氏度(即充放电 1 分钟)条件下循环 100 次以上,显示出 2.8 V 的电压(V vs. Li/Li+)和良好的循环性能,容量高于 100 mAh/g。在目前已报道的多种
锂离子电池用邻苯醌聚合物中,本研究首次在聚合物的每个重复单元中引入
菲醌作为悬垂基团,通过熔环结构保护邻苯醌的反应位置,证明这种聚合物在稳健性和循环性方面具有特别的优势。我们还报告说,我们为
降冰片烯衍
生物的
引发剂和传播端确定的官能团对多种氧化还原活性基团的耐受性也适用于
菲醌取代单体,从而产生了可逆氧化还原活性。