A novel
solid-state electrospun nanohybrid polymer membrane electrolyte
(esHPME) for sodium-ion capacitors to improve the ionic conductivity
and energy density is demonstrated. A Na2Zn2TeO6 (NZTO)-embedded 3D-nanofibrous poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) nanohybrid electrolyte
has been reported as a high-sodium-ion conducting electrolyte for
sodium-ion capacitor applications. PVDF-HFP based esHPMEs with different
loadings (0, 5, 10, and 15 wt %) of NZTO nanoparticles are prepared
by electrospinning and further activated by soaking them in a liquid
electrolyte (1M of NaPF6 in EC/DMC, 1:1 v/v) to employ
as the electrolyte-separator. Among the prepared esHPMEs, the 10 wt
% NZTO-embedded esHPME exhibits the maximum ionic conductivity and
electrochemical window of 2.5 V. The influence of hybridization between
inorganic nanoparticles (NZTO) and the organic polymer (PVDF-HFP)
is investigated by physical characterization and their electrochemical
performance. A coin cell-type Na-ion supercapacitor is fabricated
using battery-type Na0.67Co0.7Al0.3O2 as the anode and activated carbon as the cathode. The
fabricated Na-ion supercapacitor [Na0.67Co0.7Al0.3O2/esHPME (10 wt % NZTO)/AC] delivered
an energy density of 99.375 F g–1 at 1 A g–1 current density and exhibits 84% of capacity retention up to 1000
cycles of charge discharging. The Na-ion capacitor showed a maximum
energy density and power density of 35.33 W h kg–1 and 1.6 kW kg–1, respectively. Thus, the present
work demonstrates the great potential of the electrospun PVDF-HFP/NZTO-based
nanohybrid membrane electrolyte for durable Na-ion capacitors.
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