4 research outputs found
The Impacts of Aromatic Contents in Aviation Jet Fuel on the Volume Swell of the Aircraft Fuel Tank Sealants
Oxygen Defect Engineering toward Zero-Strain V<sub>2</sub>O<sub>2.8</sub>@Porous Reticular Carbon for Ultrastable Potassium Storage
Potassium-ion batteries (KIBs) are promising candidates
for large-scale
energy storage devices due to their high energy density and low cost.
However, the large potassium-ion radius leads to its sluggish diffusion
kinetics during intercalation into the lattice of the electrode material,
resulting in electrode pulverization and poor cycle stability. Herein,
vanadium trioxide anodes with different oxygen vacancy concentrations
(V2O2.9, V2O2.8, and V2O2.7 determined by the neutron diffraction) are
developed for KIBs. The V2O2.8 anode is optimal
and exhibits excellent potassium storage performance due to the realization
of expanded interlayer spacing and efficient ion/electron transport. In situ X-ray diffraction indicates that V2O2.8 is a zero-strain anode with a volumetric strain of 0.28%
during the charge/discharge process. Density functional theory calculations
show that the impacts of oxygen defects are embodied in reducing the
band gap, increasing electron transfer ability, and lowering the diffusion
energy barriers for potassium ions. As a result, the electrode of
nanosized V2O2.8 embedded in porous reticular
carbon (V2O2.8@PRC) delivers high reversible
capacity (362 mAh g–1 at 0.05 A g–1), ultralong cycling stability (98.8% capacity retention after 3000
cycles at 2 A g–1), and superior pouch-type full-cell
performance (221 mAh g–1 at 0.05 A g–1). This work presents an oxygen defect engineering strategy for ultrastable
KIBs