Interlayer gap widened ?-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 ?-MoO3, in which water molecules take the place of lattice oxygen of ?-MoO3. Accordingly, the modified ?-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 ?-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.

SUBMITTER: Yu M 

PROVIDER: S-EPMC7067814 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature