Insights into Indigo K + Association in a Half-Slurry Flow Battery
Insights into Indigo K + Association in a Half-Slurry Flow Battery
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半浆液流电池中 Indigo K 协会的见解
DOI：
10.1021/acsenergylett.2c00165
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发表时间：
2022
影响因子：
22
通讯作者：
Jiang, Jianbing Jimmy
中科院分区：
文献类型：
--
作者：
Wang, Xiao;Chai, Jingchao;Zhang, Shu;Chen, Bingbing;Chaturvedi, Ashwin;Cui, Guanglei;Jiang, Jianbing Jimmy
钾离子电池（PIB）由于钾的丰富和低成本而成为有前途的能量存储装置。然而，由于动力学扩散性差、容量有限和严重的副反应，PIB的发展仍处于起步阶段。必须探索新材料以解决PIB的容量、稳定性和循环寿命问题。本文提出了一种利用氧化还原活性有机材料储存K+的混合浆料/液流电池，其中靛蓝浆料作为阳极电解液，K4 Fe（CN）6溶液作为阴极电解液。该电池的循环寿命为1000次，容量为18.4Ah/L，容量保持率为1.83%。伏安法和密度泛函理论计算表明，靛蓝的氧化还原活性涉及一步，双电子过程，而不是两步，单电子过程。这一工作为有机化合物作为PIB缔合材料的应用提供了新的见解。
Potassium-ion batteries (PIBs) are promising energy storage devices owing to the abundance and low cost of potassium. However, the development of PIBs is still in its infancy owing to the poor kinetic diffusivity, limited capacity, and severe side reactions. It is imperative to explore new materials to address the issues of capacity, stability, and cycle life in PIBs. Here, we present a hybrid slurry/flow battery utilizing redox-active organic materials for K+storage, wherein the indigo slurry serves as the anolyte and K4Fe(CN)6solution serves as the catholyte. This battery presented a cycle life of 1000 cycles with a capacity of 18.4 Ah/L and capacity retention of ∼83%. Voltammetry measurements and density functional theory calculations indicated that the redox activity of indigo involves a one-step, double-electron process, instead of a two-step, single-electron process. This work provides new insights into the application of organic compounds as association materials for PIBs.