Issue 14, 2020

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

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

Supplementary files

Article information

Article type
Paper
Submitted
04 Feb 2020
Accepted
05 Mär 2020
First published
05 Mär 2020

Nanoscale, 2020,12, 7870-7874

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, 12, 7870 DOI: 10.1039/D0NR00964D

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