阴极
电解质
电化学
材料科学
阳极
化学工程
离子液体
电池(电)
储能
氧化还原
锂(药物)
纳米技术
化学
电极
有机化学
催化作用
工程类
功率(物理)
物理
量子力学
冶金
医学
物理化学
内分泌学
作者
Zhenzhen Wu,Yanlin Shi,Chanaka J. Mudugamuwa,Yang Pan,Hao Chen,Yuhui Tian,Milton J. Kiefel,Shanqing Zhang,Zhongfan Jia
标识
DOI:10.1016/j.jpowsour.2024.235134
摘要
Redox-active polymers are regarded as one of the most promising electroactive materials for non-lithium electrochemical energy storage devices due to the inherent molecular flexibility that can tolerate the structure change during the charge/discharge process. Their diverse functional groups provide abundant active sites to accommodate large-sized electrolyte ions. In this work, for the first time, the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical group, equipped at poly(TEMPO-acrylamide) (PTAm), is employed as an active cathode for potassium dual-ion batteries (KDIBs). Carbon nanotubes (CNTs) assist morphological engineering of the PTAm to create a conductive nanostructured composite, namely PTAm@CNTs. Systematic material characterizations and electrochemical evaluation suggest that the PTAm@CNTs nanocomposite possesses significant surface area and nanopores, enabling enhanced electronic and ionic conductivity. The PTAm@CNTs cathode reversibly stores hexafluorophosphate (PF6−) anions in KDIBs, delivering high energy density, rate capability, and robust cycling stability. The fast reaction kinetics of nitroxide radicals (N–O.), the redox-active groups on the PTAm, and their association with the PF6− anions contribute to the dual-ion storage. As a result, the PTAm@CNTs cathode delivers a high specific capacity of 108 mAh g−1 at 2 A g−1 (16.8C) over 300 cycles. The work suggests a promising pathway to design and synthesize functional organic electrode materials for potassium dual-ion batteries.
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