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Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices
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Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices
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Journal Article
Interlayer gap widened α-phase molybdenum trioxide as high-rate anodes for dual-ion-intercalation energy storage devices
2020
Overview
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-MoO
3
, in which water molecules take the place of lattice oxygen of α-MoO
3
. Accordingly, the modified α-MoO
3
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-MoO
3
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.
The power/energy trade-off is a common feature seen in a Ragone plot for an electrochemical storage device. Here the authors approach this issue by showing water-incorporated α-MoO
3
anodes with expanded interlayer gaps, which allow for the assembling of dual-ion energy storage devices.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
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