K-doped Na3Fe2(PO4)3 cathode materials with high-stable structure for sodium-ion stored energy battery

Document Type

Journal Article

Publication Title

Journal of Alloys and Compounds

ISSN

09258388

Publisher

Elsevier Ltd

School

School of Engineering

RAS ID

28380

Comments

Cao, Y., Liu, Y., Zhao, D., Zhang, J., Xia, X., Chen, T., . . . Xia, Y. (2019). K-doped Na3Fe2(PO4)3 cathode materials with high-stable structure for sodium-ion stored energy battery. Journal of Alloys and Compounds, 784, 939-946. Available here

Abstract

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 intercalation-deintercalation kinetic of sodium-ions (DNa+ = 3.98 × 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.

DOI

10.1016/j.jallcom.2019.01.125

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