Journal
JOURNAL OF POWER SOURCES
Volume 324, Issue -, Pages 766-773Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.05.050
Keywords
Electrochemical energy storage; Na-ion batteries; Prussian white; Prussian blue related; Hybrid battery
Funding
- project LINABATT [ENE2013-44330-R]
- project Etortek 14 CIC Energigune
- Basque Government [PRE.2013.1.790]
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Cubic sodium Prussian White, Na2-xFe2(CN)(6)center dot yH(2)O, and potassium Prussian White, K2-xFe2(CN)(6)center dot yH(2)O, are prepared following a mild synthetic methodology. While cubic symmetry is confirmed by XRD and TEM, IR and XPS show characteristic features different from Prussian Blue compositions. When investigated as cathode materials in sodium ion batteries, both compounds exhibit reversible capacities above 140 mAh g(-1) at 1C (ca. 80 mA g(-1)). While sodium Prussian White shows better high rate capability (10C/0.1C = 0.64), potassium Prussian White exhibits longer cycle stability, with up to 80% of capacity retention after 500 cycles. Interestingly, the potassium Prussian White phase also provides an increase of 0.35 V in the high voltage redox peak compared to the sodium Prussian White analogue ascribed to the preferential insertion of K+ ions instead of Na+, resulting in an increment of the gravimetric energy density. On the other hand, the insertion of Na+ seems to occur at the lower voltage plateau. This hybrid Na+ and K+ insertion in the framework of potassium Prussian White is most likely the responsible of the long cycle stability as a consequence of synergistic effects. (C) 2016 Elsevier B.V. All rights reserved.
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