Abstract
We have successfully fabricated large area free standing polyvinylidene fluoride -Pb(Zr0.52Ti0.48)O3 (PVDF-PZT) ferroelectric polymer-ceramic composite (wt% 80–20, respectively) thick films with an average diameter (d) ∼0.1 meter and thickness (t) ∼50 μm. Inclusion of PZT in PVDF matrix significantly enhanced dielectric constant (from 10 to 25 at 5 kHz) and energy storage capacity (from 11 to 14 J/cm3, using polarization loops), respectively, and almost similar leakage current and mechanical strength. Microstructural analysis revealed the presence of α and β crystalline phases and homogeneous distribution of PZT crystals in PVDF matrix. It was also found that apart from the microcrystals, well defined naturally developed PZT nanocrystals were embedded in PVDF matrix. The observed energy density indicates immense potential in PVDF-PZT composites for possible applications as green energy and power density electronic elements.
Highlights
There have been needs of inherent self-powered energy storage devices which can replace batteries to power the microelectronic devices like wireless sensors, mobile communication systems, electric vehicles, health monitoring systems and pulse power applications
X-ray diffraction (XRD) studies have been carried out on both PVDF and PVDF-PZT composite free standing thick films casted at temperature 100◦C, as shown in the Fig. 2(a) and 2(b)
Other XRD peaks at 36.1o, 43.2o and 57.4o are indexed to the corresponding β-phase of PVDF film and α-phase corresponds to 39.5o and 48.6o. the neat PVDF film developed by solvent casting using solvent N,N-Dimethyl formamide at temperature 100◦C shows the presence of both α and β phase which agree with the published literature by researchers.[25,26]
Summary
There have been needs of inherent self-powered energy storage devices which can replace batteries to power the microelectronic devices like wireless sensors, mobile communication systems, electric vehicles, health monitoring systems and pulse power applications. Two criteria are very important for any energy storage devices, the first one is how much energy can it store per unit of its volume or mass (energy density) and secondly the power density available to load. The power density refers how quick a system can discharge its stored energy to the external load. Our concern is to develop a system which shows higher energy storage ability and simultaneously high discharge capacity (power density). A system having superior energy density and power density is not possible at the same time so there is a compromise. Conventional batteries have very high energy density, but very slow discharge capacity, on the other hand the dielectric capacitors have high discharge capacity, but very low energy density.[1]
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