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Issue 6, 2020
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Effect of synthesis pH and EDTA on iron hexacyanoferrate for sodium-ion batteries

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Abstract

Iron hexacyanoferrate (FeHCF) particles were synthesized at room temperature with ethylenediaminetetraacetic acid (EDTA) at varying pH. The presence of EDTA produced faceted particles and increasing synthesis pH resulted in slower reaction kinetics and larger particles with lower water content and fewer anion vacancies determined by TGA and Mössbauer spectroscopy. Electrochemical testing of sodium metal half cells revealed higher capacity in FeHCF particles grown at lower pH with EDTA, obtaining a maximum discharge capacity of 151 mA h g−1 with 79% capacity retention after 100 cycles at 100 mA g−1 and a rate capability of 122 mA h g−1 at 3.2 A g−1. In contrast, particles grown at higher pH had stunted low-spin Fe redox activity but with improved long-term cyclic stability. These findings demonstrate that small changes in synthesis pH can greatly affect the growth and electrochemical properties of FeHCF when using a pH sensitive chelating agent such as EDTA.

Graphical abstract: Effect of synthesis pH and EDTA on iron hexacyanoferrate for sodium-ion batteries

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Supplementary files

Article information


Submitted
21 Jan 2020
Accepted
27 Mar 2020
First published
30 Mar 2020

Sustainable Energy Fuels, 2020,4, 2884-2891
Article type
Paper

Effect of synthesis pH and EDTA on iron hexacyanoferrate for sodium-ion batteries

Z. G. Neale, C. Liu and G. Cao, Sustainable Energy Fuels, 2020, 4, 2884
DOI: 10.1039/D0SE00120A

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