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Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices

Abstract : Employing high-rate ion-intercalation electrodes represents a feasible way to mitigate the inherent trade-off between energy density and power density for electrochemical energy storage devices, but efficient approaches to boost the charge-storage kinetics of electrodes are still needed. Here, we demonstrate a water-incorporation strategy to expand the interlayer gap of α-MoO3, in which water molecules take the place of lattice oxygen of α-MoO3. Accordingly, the modified α-MoO3 electrode exhibits theoretical-value-close specific capacity (963 C g−1 at 0.1 mV s−1), greatly improved rate capability (from 4.4% to 40.2% at 100 mV s−1) and boosted cycling stability (from 21 to 71% over 600 cycles). A fast-kinetics dual-ion-intercalation energy storage device is further assembled by combining the modified α-MoO3 anode with an anion-intercalation graphite cathode, operating well over a wide discharge rate range. Our study sheds light on a promising design strategy of layered materials for high-kinetics charge storage.
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https://hal.archives-ouvertes.fr/hal-03103790
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Submitted on : Friday, January 8, 2021 - 1:28:30 PM
Last modification on : Monday, April 12, 2021 - 2:38:08 PM
Long-term archiving on: : Friday, April 9, 2021 - 6:56:52 PM

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Minghao Yu, Hui Shao, Gang Wang, Fan Yang, Chaolun Liang, et al.. Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices. Nature Communications, Nature Publishing Group, 2020, 11 (1), pp.1348. ⟨10.1038/s41467-020-15216-w⟩. ⟨hal-03103790⟩

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