期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 784, 期 -, 页码 939-946出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.125
关键词
K-doped; Iron-based; Cathode material; Sodium-ion battery
资金
- Shanghai Science and Technology Commission [14DZ2261000]
- national key research and development Program of China [2016YFB0901500]
A novel NASICON-type K0.24Na2.76Fe2(PO4)(3) (K0.24NFP) is synthesized via a simple solid-state reaction method. K-doped method can enlarge lattice distance and restrain the structure dilapidation from Na3Fe2(PO4)(3) to Na5Fe2(PO4)(3). Comparison with undoped-Na3Fe2(PO4)(3) (NFP) sample (82.1 mAh g(-1)), K0.24NFP electrode shows a 101.3 mAh g(-1) discharge capacity at 10 mA g(-1), which up to 97% of theoretical capacity. As for rate capability performance, a high reversible capacity of 73.6 mAh g(-1) at 1000 mA g(-1). The cycle stability performance measurement results indicate that the discharge capacity of K0.24NFP electrode is up to 93.7 mAh g(-1) after 500 cycles at 100 mA g(-1). The excellent electrochemical performance is attributed to the improvement of structural stability and the highest intercalationde-intercalation kinetic of sodium-ions (D-NA(+), = 3.98 x 10(-11)) due to K-doped. Hence, the K-doped iron-based phosphate (K0.24Na2.76Fe2(PO4)(3)) should be a potential cathode material in sodium-ions batteries for scale energy storage. (C) 2019 Elsevier B.V. All rights reserved.
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