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Nanostructured potassium–organic framework as an effective anode for potassium-ion batteries with a long cycle life
Nanoscale ( IF 5.8 ) Pub Date : 2020/03/05 , DOI: 10.1039/d0nr00964d Chao Li 1, 2, 3, 4, 5 , Kuaibing Wang 5, 6, 7, 8, 9 , Jingze Li 1, 2, 3, 4 , Qichun Zhang 5, 6, 7, 8
Nanoscale ( IF 5.8 ) Pub Date : 2020/03/05 , DOI: 10.1039/d0nr00964d Chao Li 1, 2, 3, 4, 5 , Kuaibing Wang 5, 6, 7, 8, 9 , Jingze Li 1, 2, 3, 4 , Qichun Zhang 5, 6, 7, 8
Affiliation
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Finding new organic materials to address several issues (e.g. capacity, stability, and cycle life) in organic potassium-ion batteries (OPIBs) is very important and highly desirable. Here, to directly investigate the redox reaction of organic pyridine dicarboxylate in OPIBs and to avoid the interference from the redox-active metal ions, a non-redox-metal potassium metal–organic framework (K-MOF), [C7H3KNO4]n, based on pyridine-2,6-dicarboxylic acid (H2PDA), has been successfully synthesized and applied as a promising organic anode for long-cycle life PIBs. The crystal structure of [C7H3KNO4]n was confirmed by single-crystal X-ray diffraction analysis and FT-IR spectra. Moreover, the potassium-storage mechanism of organic pyridine dicarboxylate ligand was revealed by ex situ FT-IR/XRD characterization and theoretical calculations. The as-synthesized K-MOF resulted in a unique and reversible three-step redox reaction, exhibited superior electrochemical performance with the aid of N–K/O–K coordination bonds, and showed a high average specific capacity of 115 mA h g−1 at 100 mA g−1 for 300 cycles with the capacity retention of 92%.
中文翻译：
纳米结构的钾-有机骨架可有效地延长钾离子电池的使用寿命
寻找新的有机材料来解决有机钾离子电池（OPIB）中的几个问题（例如容量，稳定性和循环寿命）是非常重要且非常需要的。在这里，为了直接研究有机吡啶二羧酸盐在OPIBs中的氧化还原反应，并避免氧化还原活性金属离子的干扰，使用了一种非氧化还原金属钾金属有机骨架[C 7 H 3 KNO基于吡啶2,6-二羧酸（H 2 PDA）的4 ] n已成功合成，并被用作长寿命PIB的有希望的有机阳极。[C 7 H 3 KNO 4 ] n的晶体结构通过单晶X射线衍射分析和FT-IR光谱确认。此外，通过异位FT-IR / XRD表征和理论计算揭示了有机吡啶二羧酸酯配体的钾存储机理。合成后的K-MOF导致独特且可逆的三步氧化还原反应，借助N-K / O-K配位键表现出优异的电化学性能，并显示出115 mA hg -1的高平均比容量在100 mA g -1下进行300次循环，容量保持率为92％。
更新日期：2020-04-09
中文翻译：
纳米结构的钾-有机骨架可有效地延长钾离子电池的使用寿命
寻找新的有机材料来解决有机钾离子电池（OPIB）中的几个问题（例如容量，稳定性和循环寿命）是非常重要且非常需要的。在这里，为了直接研究有机吡啶二羧酸盐在OPIBs中的氧化还原反应，并避免氧化还原活性金属离子的干扰，使用了一种非氧化还原金属钾金属有机骨架[C 7 H 3 KNO基于吡啶2,6-二羧酸（H 2 PDA）的4 ] n已成功合成，并被用作长寿命PIB的有希望的有机阳极。[C 7 H 3 KNO 4 ] n的晶体结构通过单晶X射线衍射分析和FT-IR光谱确认。此外，通过异位FT-IR / XRD表征和理论计算揭示了有机吡啶二羧酸酯配体的钾存储机理。合成后的K-MOF导致独特且可逆的三步氧化还原反应，借助N-K / O-K配位键表现出优异的电化学性能，并显示出115 mA hg -1的高平均比容量在100 mA g -1下进行300次循环，容量保持率为92％。
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