研究目的
To investigate the energy storage performance of a novel 0–3 type (Bi0.32Sr0.42Na0.20)TiO3/MgO composite, focusing on enhancing energy storage density, efficiency, and charge-discharge performance, and to understand the role of MgO incorporation through numerical simulations.
研究成果
The 0–3 type (Bi0.32Sr0.42Na0.20)TiO3/MgO composite achieves high energy storage density (WR?2.09 J/cm3), efficiency (η?84%), and excellent charge-discharge performance (CD?1671 A/cm2, PD?150 MW/cm3) under low electric fields, with fast energy release (?0.15 μs). Numerical simulations confirm that MgO incorporation enhances breakdown strength by modifying local electric fields. The composite shows good temperature, frequency, and fatigue stability, making it a promising lead-free material for high-performance capacitors, with insights into the role of metallic oxides in composites.
研究不足
The study is limited to specific MgO concentrations (0–8 wt%) and may not cover all possible composite variations. Aggregation of MgO at high concentrations (e.g., 8 wt%) can reduce performance, and the simulations assume idealized models based on SEM images, which may not fully capture real microstructural complexities. Temperature and frequency ranges tested are finite (25–140°C, 5–1000 Hz), and long-term stability beyond 105 cycles is not explored.
1：Experimental Design and Method Selection:
The study involves synthesizing (Bi
2：32Sr42Na20)TiO3 (BNST) powders with varying MgO additions (0–8 wt%) using a hot-press sintering technique to create dense composites. Numerical simulations (COMSOL) are used to model electric field distributions. Sample Selection and Data Sources:
Samples are prepared with different MgO contents (0, 1, 3, 4, 6, 8 wt% MgO), characterized by XRD, SEM, dielectric properties, P-E loops, and charge-discharge tests.
3：List of Experimental Equipment and Materials:
Raw chemicals (Bi2O3, SrCO3, Na2CO3, TiO2, MgO), zirconia media, ethanol, PVA, silver paste; equipment includes ball mill, hot-press, XRD (Bruker D8 Advance), SEM (JEOL JSM-6490LV), LCR meter (Agilent E4980A), ferroelectric test system (TF analyzer 2000), and RLC circuit for charge-discharge tests.
4：Experimental Procedures and Operational Workflow:
Raw powders are milled, calcined, mixed with MgO, ball-milled, granulated, pressed into pellets, sintered via hot-pressing, polished, and coated with electrodes. Characterization involves XRD for structure, SEM for morphology, dielectric measurements, P-E loop capture, and charge-discharge performance evaluation.
5：Data Analysis Methods:
Data analyzed using linear intercept method for grain size, Archimedes method for density, and numerical simulations for electric field distribution; energy storage parameters calculated from P-E loops and charge-discharge curves.
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XRD
D8 Advance
Bruker
Monitoring crystal structures of sample powders
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SEM
JSM-6490LV
JEOL
Observing morphology of ceramics fracture with backscattered electron mode
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LCR meter
E4980A
Agilent
Testing dielectric properties at various temperatures and frequencies
E4980A/E4980AL Precision LCR Meter
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Ferroelectric test system
TF analyzer 2000
AixACCT
Capturing hysteresis loops (P-E loops)
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Hot-press
Sintering pellets at high temperature and pressure
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Ball mill
Milling raw powders and mixtures
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RLC circuit
Detecting charge-discharge properties
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COMSOL
COMSOL
Numerical simulations for electric potential and local electric field distributions
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