| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 178955 | Electrochemistry Communications | 2015 | 4 Pages |
•A completely new compound was prepared by the chemical oxidation of alluaudite Na2.4Fe1.8(SO4)3 phase.•The electrochemical performance of Na0.89Fe1.8(SO4)3 in lithium battery application was investigated for the first time.•A high capacity of 110 mAh g− 1 at 0.1 C (1 C = 118 mAh g− 1) was obtained.•A good rate kinetics and reversibility was confirmed involving a high Fe3 +/Fe2 + redox potential of 3.75 V (vs. Li/Li+).
A new desodiated derivative compound, Na0.89Fe1.8(SO4)3, was prepared by the chemical oxidation of alluaudite Na2.4Fe1.8(SO4)3 phase using NOBF4 as oxidant. The structure and valency of Fe were characterized by X-ray diffraction (XRD) and 57Fe Mössbauer spectroscopy. Intercalation behavior of lithium ions in the structure of Na0.89Fe1.8(SO4)3 was gauged by electrochemical analyses and ex-situ X-ray diffraction. A high capacity of 110 mAh g− 1 at 0.1 C was obtained with a good rate kinetics within a range of 0.1–10 C(1 C = 118 mAh g− 1) involving a high Fe3 +/Fe2 + redox potential of 3.75 V (vs. Li/Li+). These results confirmed that the Na2.4− δFe1.8(SO4)3 framework was stable even after oxidation and forms a new competitive cathode for the reversible intercalation of lithium ions.
Graphical abstractA new desodiated derivative compound of Na0.89Fe1.8(SO4)3 was introduced as a host for the insertion/de-insertion of lithium ions, and a high capacity of 110 mAh g− 1 at 0.1 C was obtained with a good rate kinetics within a range of 0.1–10 C (1 C= 118 mAh g− 1) involving a high Fe3 +/Fe2 + redox potential of 3.75 V (vs. Li/Li+).Figure optionsDownload full-size imageDownload as PowerPoint slide
