ABSTRACT Flexible supercapacitors (SCs) are attractive
energy storage devices for wearable electronics, but their applications
are hindered by their low volumetric energy densities.
Two dimensional (2D) non-carbon nanomaterials are
the most promising pseudocapacitive materials for high volumetric
capacitance electrodes. However, they are poorly
conductive and prone to self-stacking, which results in unsatisfactory
electrochemical performance. In this work, largescale
V2O5·nH2O ultrathin nanosheets are synthesized by a
facile and scalable method and transformed into layered and
compact composite films with one-dimensional carbon nanotubes
(CNTs). The self-standing films show an optimized
volumetric capacitance of 521.0 F cm−3 with only 10 wt% of
CNTs, which is attributed to dramatically enhanced electrical
conductivity beyond the electrical percolation threshold, high
dispersion of pseudocapacitive V2O5·nH2O nanosheets, and
high mass density of the films. All-solid-state flexible SCs
made of V2O5·nH2O/CNTs films show a maximum energy
density of 17.4 W h L−1.
Keywords: flexible supercapacitors, volumetric capacitance, twodimensional
nanosheets, vanadium pentoxide, layered structure

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• Compact self-standing layered film assembled by V2O5·nH2O/CNTs 2D/1D composites for high volumetric capacitance flexible supercapacitors