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Nanostructured potassium–organic framework as an effective anode for potassium-ion batteries with a long cycle life

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Abstract

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%.

Graphical abstract: Nanostructured potassium–organic framework as an effective anode for potassium-ion batteries with a long cycle life

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Article information


Submitted
04 Feb 2020
Accepted
05 Mar 2020
First published
05 Mar 2020

Nanoscale, 2020, Advance Article
Article type
Paper

Nanostructured potassium–organic framework as an effective anode for potassium-ion batteries with a long cycle life

C. Li, K. Wang, J. Li and Q. Zhang, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR00964D

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