Abstract
A new Co-base sodium metaphosphate compound, NaCo(PO3)3, has been synthesized here by solid-state method. The crystal structure is refined by the Rietveld method, and the results reveal that NaCo(PO3)3 has an orthorhombic structure with the space group of P2 1 2 1 2 1 and lattice parameters of a = 14.2453(2) Å, b = 14.2306(1) Å, and c = 14.2603(2) Å. Its typical morphology and chemical composition are confirmed by scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS). The valence states of all elements and the internal/external vibrational modes of NaCoP3O9 compound are measured by X-ray photoelectron and vibrational spectrum, where a typical feature of the (PO3)− polyanion group is observed. Meanwhile, the electrochemical properties of NaCo(PO3)3 cathode for sodium-ion batteries are also elevated and an initial discharge capacity of 33.8 mAh/g can be obtained at 0.05 C within 1.5–4.2 V. After 20 cycles, a discharge capacity of 26.7 mAh/g can be obtained and a well-kept oxidation–reduction plateau is still observed for NaCo(PO3)3 cathode, indicating the good reversibility of this metaphosphate electrode.
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Acknowledgments
This work was funded by NSFC Grant supported through NSFC Committee of China (No. 51172077 & 51372089) and the Foundation supported through the Fundamental Research Funds for the Central Universities (No. 2014ZB0014).
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Lin, X., Dong, Y., Kuang, Q. et al. Synthesis, structural, and electrochemical properties of NaCo(PO3)3 cathode for sodium-ion batteries. J Solid State Electrochem 20, 1241–1250 (2016). https://doi.org/10.1007/s10008-015-3114-2
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DOI: https://doi.org/10.1007/s10008-015-3114-2