- 标题
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- 实验方案
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Multifunctional BaTiO <sub/>3</sub> -(Bi <sub/>0.5</sub> Na <sub/>0.5</sub> )TiO <sub/>3</sub> -based MLCC with high energy storage properties and temperature stability
摘要： BaTiO3-(Bi0.5Na0.5)TiO3 (BTBNT)-based multilayer ceramic capacitor (MLCC) chips with the inner electrodes being Ag0.6/Pd0.4 are prepared by a roll-to-roll casting method. The BTBNT-based MLCC chips with ten-dielectric layers can be sintered very well at a low temperature of 1130°C via two step sintering (TSS). X-ray diffraction (XRD) and transmission electron microscope (TEM) results show that MLCC chips are a core-shell structure with two phases coexistence. The core exhibits a tetragonal phase at room temperature and then gradually changes into a cubic phase when the temperature increases above Tc (175°C). While, the shell exhibits a pseudocubic phase at all tested temperature from 25°C to 500°C. BTBNT-based MLCC chips exhibit a broad temperature stability and meet the requirement of Electronic Industries Association (EIA) X9R specifications. In terms of energy storage performance, a large discharge energy density of 3.33 J/cm3 can be obtained at 175°C under the applied electric field of 480 kV/cm. Among all tested temperature ranging from -50°C to 200°C, the energy efficiency of all chips is higher than 80%, even under a high applied electric field. The experimental results indicate that this novel BTBNT-based X9R MLCCs can be one of the most promising candidates for energy storage applications, especially operated in high temperature.
关键词： Energy storage,X9R,Two-step sintering (TSS),Core-shell structure,Multilayer ceramic capacitor (MLCC)
更新于2025-09-23 15:23:52
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[Ceramic Transactions Series] Proceedings of the 12th Pacific Rim Conference on Ceramic and Glass Technology (Ceramic Transactions) || Recent Topics in the Field of Ferroelectric Materials for BME-MLCCs
摘要： The present paper focuses on the recent direction of materials technology for Base Metal Electrode (BME)-Multilayer Ceramic Capacitors (MLCCs). Recently, technologies are accelerating in the area of miniaturization, high capacitance, and reduction of production cost of MLCCs, in order to meet the requirements of the electronics market. In order to maintain high capacitance values with smaller case sizes, reduction in thickness and the multiplication of the dielectric layers have been advancing. Thinning dielectric layers, however, has a deleterious effect on the dielectric performance and it is considered getting closer to dimensional limit. So far, temperature stable MLCCs of high capacitance such as X7R, X7S, and X7T specifications in EIA-STD have been employing BaTiO3 based ferroelectric materials. In the case of BaTiO3 based ferroelectrics, X8R characteristics may be a limit for temperature stable MLCCs, because Curie temperature of BaTiO3 is around 120-130oC. Under these circumstances, numerous studies have been devoted to ferroelectric materials such as giant dielectric constant (K) materials, high TC materials of high K, and high withstanding voltage materials. In this paper, these challenges in the field of dielectric materials for MLCCs are reviewed, and a potential of filled tungsten-bronze-type ferroelectrics for high capacitance BME-MLCCs of X9R specification (ΔC/C25 ±15%, -55~200oC) are proposed.
关键词： BME-MLCCs,X9R specification,ferroelectric materials,tungsten-bronze-type ferroelectrics,BaTiO3
更新于2025-09-04 15:30:14