Effects of Mixing Ratio and Poling on Output Characteristics of BaTiO3-Poly Vinylidene Fluoride Composite Piezoelectric Generators

초록

BaTiO3-Poly vinylidene fluoride (PVDF) solution was prepared by adding 0 similar to 25 wt% BaTiO3 nanopowder and 10 wt% PVDF powder in solvent. BaTiO3-PVDF film was fabricated by spreading the solution on a glass with a doctor blade. The output performance increased with increasing BaTiO3 concentration. When the BaTiO3 concentration was 20 wt%, the output voltage and current were 4.98 V and 1.03 mu A at an applied force of 100 N. However, they decreased when the over 20 wt% BaTiO3 powder was added, due to the aggregation of particles. To enhance the output performance, the generator was poled with an electric field of 150 similar to 250 kV/cm at 100 degrees C for 12 h. The output performance increased with increasing electric field. The output voltage and current were 7.87 V and 2.5 mu A when poled with a 200 kV/cm electric field. This result seems likely to be caused by the c-axis alignment of the BaTiO3 after poling treatment. XRD patterns of the poled BaTiO3-PVDF films showed that the intensity of the (002) peak increased under high electric field. However, when the generator was poled with 250 kV/cm, the output performance of the generator degraded due to breakdown of the BaTiO3-PVDF film. When the generator was matched with 800 Omega resistance, the power density of the generator reached 1.74 mW/m(2). The generator was able to charge a 10 mu F capacitor up to 1.11 V and turn on 10 red LEDs.

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