4.7 Article

Cathode Properties of Na3FePO4CO3 Prepared by the Mechanical Ball Milling Method for Na-ion Batteries

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SCIENTIFIC REPORTS
卷 10, 期 1, 页码 -

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NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-020-60183-3

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  1. ESICB (Elements Strategy Initiative for Catalysts and Batteries) Project of MEXT, Japan

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The carbonophosphate Na3FePO4CO3 was synthesized by the mechanical ball milling method for the first time. The composition of the obtained sample with a higher amount of Fe2+ was Na2.66Fe0.662+Fe0.343+PO4CO3 as confirmed by Mossbauer analysis, owing to the good airtight properties of this method. The obtained samples in an organic electrolyte delivered an initial discharge capacity of 124 mAh/g at room temperature, and a larger discharge capacity of 159 mAh/g (1.66 Na+/mole) at 60 degrees C. With 17 m NaClO4 aqueous electrolyte, a discharge capacity of 161 mAh/g (1.69 Na+/mole) was delivered because of the high ionic conductivity of the concentrated aqueous electrolyte. During the charge-discharge process, the formation of Fe4+ after charging up to 4.5 V and the return of Fe2+ after discharging down to 1.5V were detected by ex-situ X-ray absorption near edge structure (XANES) analysis.

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