Enhanced energy storage performance of BaTiO3 and BiFeO3 - based dielectric ceramics and their thin films for capacitor applications

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The rising global demand for energy consumption for meeting the commercial and economic growth concerns for sustainable energy resources, generation, harvesting, and storage. The energy storage devices include electrochemical capacitors, batteries, fuel cells, and dielectric capacitors. Among these storage devices, dielectric ceramics offer inherently high power density and ultrafast charging/discharging time ranging from micro-nano to second time. This thesis mainly focuses on lead-free dielectric ceramics and thin films for energy storage applications. A detailed investigation of two systems, (1-x)BaTiO3-xBiFeO3 (BTBF) and (1-x)BaTiO3-xBi[Zn2/3(Nb0.85Ta0.85)1/3]O3 (BT-BZNT) from BaTiO3-BiMeO3 (where Me is trivalent or average trivalent metal ions) solid solution family in the bulk form is carried out. The ferroelectric studies for both compositions are analyzed to evaluate energy storage performance. The BTBF3 composition displayed a Wrec and η (%) of ⁓ 40 mJ/cm3 and 60.92%, respectively, at 25 kV/cm applied field, which is sufficiently lower as compared to other BaTiO3-BiMeO3 systems. A significant improvement in energy storage performance is observed in BT-BZNT ceramics. A remarkably high Wrec of 2.06 J/cm3 with an η (%) of 78% is achieved for BT-BZNT3 ceramics at an applied field of 180 kV/cm. The ultrahigh-energy efficiency of up to 96% is observed for higher concentrations in BT-BZNT ceramics. Herein, BT-BZNT3 and BT-BZNT4 ceramics exhibited a comparable energy storage performance at a lower applied field of 180 kV/cm, demonstrating the excellence of BT-BZNT ceramics over other BaTiO3-BiMeO3 family.
Supervisor: Dobbidi, Pamu