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Issue 33, 2015
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Influence of relative humidity on the structure and electrochemical performance of sustainable LiFeSO4F electrodes for Li-ion batteries

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Abstract

Material abundance and eco-efficient synthetic protocols are becoming the overriding factors for developing sustainable Li-ion batteries, and hence today there is great interest in LiFePO4. The recently reported tavorite-type LiFeSO4F cathode material, which shows a redox potential of 3.6 V and a practical capacity of ∼130 mA h g−1 without the need for sophisticated carbon coating or particle downsizing, stands presently as a serious contender to LiFePO4. However, its synthesis is still not routinely reproducible. Herein, we offer a direct explanation by showing the strong effect of the room temperature relative humidity on both LiFeSO4F aging stability and its electrochemical performances. We demonstrate the complete degradation of tavorite-type LiFeSO4F into FeSO4·nH2O (n = 1, 4, 7) and LiF in environments with relative humidities greater than 62%, and also show the feasibility of triggering in situ formation of a F-free (Li)FeSO4OH phase within the cell. This work, which we also extend to the 3.9 V triplite-type LiFeSO4F polymorph, provides a foundation for achieving the consistent production and handling of LiFeSO4F electrodes in view of large-scale manufacturing. This moisture sensitivity issue, which can be mitigated by surface treatments, is inherent to sulfate-based electrode materials and the battery community must be aware of it.

Graphical abstract: Influence of relative humidity on the structure and electrochemical performance of sustainable LiFeSO4F electrodes for Li-ion batteries

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Publication details

The article was received on 08 Jul 2015, accepted on 10 Jul 2015 and first published on 17 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA05107J
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Citation: J. Mater. Chem. A, 2015,3, 16988-16997
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    Influence of relative humidity on the structure and electrochemical performance of sustainable LiFeSO4F electrodes for Li-ion batteries

    L. Zhang, J. Tarascon, M. T. Sougrati, G. Rousse and G. Chen, J. Mater. Chem. A, 2015, 3, 16988
    DOI: 10.1039/C5TA05107J

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