TY - JOUR
T1 - Influence of relative humidity on the structure and electrochemical performance of sustainable LiFeSO4F electrodes for Li-ion batteries
AU - Zhang, Leiting
AU - Tarascon, Jean-Marie
AU - Sougrati, Moulay Tahar
AU - Rousse, Gwenaëlle
AU - Chen, Guohua
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2015/7/10
Y1 - 2015/7/10
N2 - 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.
AB - 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.
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U2 - 10.1039/c5ta05107j
DO - 10.1039/c5ta05107j
M3 - RGC 21 - Publication in refereed journal
SN - 2050-7488
VL - 3
SP - 16988
EP - 16997
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 33
ER -
