Journal
ELECTROCHIMICA ACTA
Volume 220, Issue -, Pages 114-121Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.10.062
Keywords
potassium; iron hexacyanoferrate; interstitial site; phase transition; sodium-ion batteries
Categories
Funding
- National Science Foundation of China [51577175]
- Hefei Center of Materials Science and Technology [2014FXZY006]
- Education Department of Anhui Province [KJ2014ZD36]
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The synthesis of NaxKyFe[Fe(CN)(6)] througha simple co-precipitation method and the application of these nanoparticles in sodium-ion batteries are presented. K1.90Fe[Fe(CN)(6)] with a cubic structure shows low volumetric change during electrochemical cycling. It is clarified by ex-situ X-ray diffraction and cyclic voltammetry curves that K+ influences the intercalation sites of the neighboring Na+. More significantly, this hexacyanoferrate delivers a high capacity of 137.0 mAh g(-1) at a current density of 14 mA g(-1) and superior cyclability with 94% capacity retention after 120 cycles, showing great promise for sodium-ion battery applications. (C) 2016 Elsevier Ltd. All rights reserved.
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