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Cathode Properties of Na3FePO4CO3 Prepared by the Mechanical Ball Milling Method for Na-ion Batteries
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Journal Article
Cathode Properties of Na3FePO4CO3 Prepared by the Mechanical Ball Milling Method for Na-ion Batteries
2020
Overview
The carbonophosphate Na
3
FePO
4
CO
3
was synthesized by the mechanical ball milling method for the first time. The composition of the obtained sample with a higher amount of Fe
2+
was Na
2.66
Fe
2+
0.66
Fe
3+
0.34
PO
4
CO
3
as confirmed by Mössbauer 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 °C. With 17 m NaClO
4
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 Fe
4+
after charging up to 4.5 V and the return of Fe
2+
after discharging down to 1.5 V were detected by
ex-situ
X-ray absorption near edge structure (XANES) analysis.
Publisher
Springer Science and Business Media LLC,Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
