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


ABSTRACT: 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 Na2.66Fe2+0.66Fe3+0.34PO4CO3 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 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 1.5?V were detected by ex-situ X-ray absorption near edge structure (XANES) analysis.

SUBMITTER: Xie B 

PROVIDER: S-EPMC7039986 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Cathode Properties of Na<sub>3</sub>FePO<sub>4</sub>CO<sub>3</sub> Prepared by the Mechanical Ball Milling Method for Na-ion Batteries.

Xie Baowei B   Sakamoto Ryo R   Kitajou Ayuko A   Nakamoto Kosuke K   Zhao Liwei L   Okada Shigeto S   Fujita Yuki Y   Oka Nobuto N   Nishida Tetsuaki T   Kobayashi Wataru W   Okada Masaki M   Takahara Toshiya T  

Scientific reports 20200224 1


The carbonophosphate Na<sub>3</sub>FePO<sub>4</sub>CO<sub>3</sub> was synthesized by the mechanical ball milling method for the first time. The composition of the obtained sample with a higher amount of Fe<sup>2+</sup> was Na<sub>2.66</sub>Fe<sup>2+</sup><sub>0.66</sub>Fe<sup>3+</sup><sub>0.34</sub>PO<sub>4</sub>CO<sub>3</sub> 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 cap  ...[more]

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