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- W2079486544 abstract "The recent discovery of electrochemical activity at 3.6 V vs Li+/Li0 in LiFeSO4F has generated widespread research activity in this new family of fluorosulfate electrode materials aiming at either increasing the Fe3+/Fe2+ redox potential, searching for new active members, or extending this family to hydroxyl-fluorosulfates. Here we present a new low temperature single step synthesis of FeSO4F1–yOHy phases using FeF3 and Fe2(SO4)3·nH2O as precursors. Using thorough chemical analytical techniques to test for F– content in conjunction with Mössbauer measurements, we demonstrate the existence of a limited solid solution (0.35 < y<1) within this system. Members pertaining to this solid solution have a redox activity ranging from 3.2 to 3.6 V vs Li+/Li0 and show sustained reversible capacity retention of 130 mAh/g which makes them potentially interesting for Li-based polymer batteries. We demonstrate that the Li-insertion-deinsertion mechanism depends markedly on the sample F–content by using joint in situ XRD and Mössbauer spectroscopy. Moreover, we show the versatility of our synthetic approach by extending it to the elaboration of Fe1–zMzSO4F1–yOHy phases with M = Ti and V." @default.
- W2079486544 created "2016-06-24" @default.
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- W2079486544 date "2012-04-06" @default.
- W2079486544 modified "2023-10-11" @default.
- W2079486544 title "Single-Step Synthesis of FeSO<sub>4</sub>F<sub>1–<i>y</i></sub>OH<sub><i>y</i></sub> (0 ≤ <i>y</i> ≤ 1) Positive Electrodes for Li-Based Batteries" @default.
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- W2079486544 doi "https://doi.org/10.1021/cm300188a" @default.
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