Novel approaches for perovskite-based ferroelectric ceramics in energy storage
With the increasing impacts of climate change and resource depletion, dielectric capacitors are becoming important candidates for high-performance energy storage devices. However, several dielectric ceramics, such as paraelectric materials, ferroelectric materials, and antiferroelectric materials, face challenges due to their low polarizability, low breakdown strength, and large hysteresis loss. Therefore, synthesizing new perovskite-based materials that offer high energy density, efficiency, and low loss is essential for improving energy storage performance.
A team of materials scientists led by Bingcheng Luo from the Department of Applied Physics of China Agricultural University recently assessed the state of perovskite-based ferroelectric ceramics for energy storage. These capacitors are known for their stability, high energy and power density, conversion efficiency, wide operating temperature range, environmental friendliness and cost-effectiveness, which distinguish them from traditional electrochemical capacitors and batteries.
“In this review, we outlined the recent development of perovskite-based ferroelectric energy storage ceramics from the perspective of combinatorial optimization for tailoring ferroelectric hysteresis loops and extensively discussed the properties arising from the different combinations of components. Also we provide the future directions in this domain and therefore the combinatorial optimization strategy in this review will open a practical route to the application of new high-performance ferroelectric energy storage devices,” said Bingcheng Luo, senior author of the review paper, professor at the Department of Applied Physics. from China Agricultural University, who received his PhD from Tsinghua University in 2018 and then worked as a Research Associate at the University of Cambridge.
Dielectric materials can be divided into four types based on their hysteresis loops: paraelectric (PE), ferroelectric (FE), relaxor ferroelectric (RFE), and antiferroelectric (AFE), each with unique properties.
The research team highlights advances in the energy storage performance of lead-free ferroelectric ceramics. “We classify the perovskite-based ferroelectric ceramics into seven types for tuning ferroelectric hysteresis loops from the perspective of combinatorial optimization and extensively discuss the properties arising from the different combinations of components. The concept of combinatorial optimization is to maximize of the breakdown strength and maximum saturation polarization while the electrical hysteresis loop becomes slimmer, which strengthens the energy storage performance of perovskite-based ferroelectric ceramics,” said Bingcheng Luo.
The seven types of combinatorial optimization of perovskite-based ferroelectric ceramics discussed in the review include FE vs. PE, FE vs. FE, FE vs. AFE, AFE vs. PE, RFE vs. PE, RFE vs. FE, and RFE vs. . AFE combinations. Luo explained: “As an example of combinatorial optimization strategies, ferroelectric materials have a higher maximum saturation polarization, and paraelectric materials have a higher breakdown strength, and the combination of the two creates an RFE that has the advantages of both materials and with a narrower hysteresis loop, the long-range Ferroelectric order will become polar nanodomains, which will increase the energy storage density and efficiency of ceramics.”
The concept of combinatorial optimization aims to maximize the complementary benefits of each component. In general, polarization and breakdown strength are mutually exclusive in dielectric materials. Increasing the level of one component alone does not lead to high breakdown strength or polarization. It is necessary to find the optimal balance between these factors and tailor more optimized hysteresis loops to improve energy storage performance.
The team expects that their assessment of combinatorial optimization strategies will not only aid the design of future high-performance passive devices, but also provide guidance for the practical use of ferroelectric ceramics.
Research report:Combinatorial optimization of perovskite-based ferroelectric ceramics for energy storage applications
