A combinatorial improvement strategy to enhance the energy storage performances of the KNN–based ferroelectric ceramic capacitors
Source abstract
Abstract
With the increasing demand for miniaturization and integration in electronic equipment, environmental-friendly K0.5Na0.5NbO3 (KNN) based lead–free energy storage ceramic capacitors have caused extensive concern not only for their ultrahigh power density but also for ultrafast charging/discharging rates. However, their recoverable energy storage density (Wrec) and efficiency (η) are poor due to the large energy loss (Wloss) and low breakdown electric field (Eb). In this work, a combinatorial improvement strategy is proposed to enhance the energy storage performance of KNN–based ceramics. First, the introduction of 0.05Bi(Zn0.5(Ti1–xZrx)0.5)O3 (BZTZ) solid solution in pure KNN ceramics extremely destroys the long–range polar ordering and forms the PNRs, which effectively decreases the remnant polarization (Pr) and enhances η. Second, the substitution of Zr to Ti ions reduces the migration of grain boundary and thereby inhibits grain growth. Third, the BZTZ solid solution as a high–κ insulator improves the band–gap energy (Eg) of the KNN–based ceramics. Both of them could boost Eb. Finally, the x = 0.75 ceramic with an excellent Wrec (3.70 J cm–3) and η (75.3%) at a particularly large Eb (340 kV cm–1) was successfully obtained. The combinatorial improvement strategy in this work provides a novel way to enhance the energy storage performance of the lead–free dielectric capacitors.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Ferroelectric and Piezoelectric Materials · Dielectric materials and actuators · Microwave Dielectric Ceramics Synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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