Simultaneously enhanced discharge energy density and efficiency in nanocomposite films capacitors utilizing two-dimensional NaNbO3@Al2O3 platelets
With the rapid development of the consumer electronics market, electrostatic capacitors need to store as much energy as possible in a rather restricted space. In this work, the nanocomposite films combining two-dimensional core-shell NaNbO3@Al2O3 platelets (2D NN@AO Ps) and poly(vinylidene-fluoride hexafluoropropylene) (P(VDF-HFP)), featuring with excellent energy-storage capability, high efficiency, and ultrafast discharge performance, are designed and fabricated. Both the experimental results and finite element simulation confirm the superiority of the 2D NN@AO Ps nanocomposite films in improving the breakdown strength (Eb) and energy-storage capability. Especially, the introduction of 3 vol% 2D NN@AO Ps results in much enhanced discharge energy density of 14.59 J/cm3 and outstanding discharge efficiency of 70.1% in NN@AO Ps/P(VDF-HFP) nanocomposite films, much greater than pure P(VDF-HFP) (7.74 J/cm3). The corresponding nanocomposite films exhibit excellent reliability in energy storage performance by consecutive cycling. Therefore, this research could bring the polymer nanocomposites into a new chapter of study and application of energy storage dielectric capacitors.