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Balancing Polarization and Breakdown for High Capacitive Energy Storage by Microstructure Design
Bingbing Yang1,2, Yiqian Liu2, Wei Li2
1Key Laboratory of Materials Physics Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China.
Advanced Materials (Deerfield Beach, Fla.)
|May 28, 2024
Summary
Achieving high energy storage requires balancing polarization and breakdown strength. Optimal microstructures with small grain sizes and moderate crystallinity enhance dielectric performance, leading to ultrahigh energy density in novel films.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Dielectric Materials
Background:
- High energy storage performance in dielectric materials necessitates a compromise between polarization and breakdown strength.
- Amorphous and crystalline microstructures influence these parameters differently: amorphous states favor breakdown strength, while crystalline states enhance polarization.
- Systematic, quantitative investigations are needed to balance amorphous and crystalline phases for optimal energy storage.
Purpose of the Study:
- To comprehensively evaluate the trade-off between polarization and breakdown field.
- To investigate the influence of microstructural evolution (grain size, crystallinity) on energy storage performance.
- To provide guidance for enhancing dielectric energy storage through microstructure design.
Main Methods:
- Phase-field simulations were employed to model the evolution of microstructure and its effect on polarization and breakdown field.
- Systematic variation of grain size and crystallinity was simulated.
- Experimental validation using Bi3NdTi4O12 films with microcrystal-amorphous dual-phase structures.
Main Results:
- Phase-field simulations revealed that small grain sizes (10-35 nm) combined with moderate crystallinity (60-80%) optimize both polarization and breakdown field.
- This dual-phase microstructure simultaneously maintains relatively high polarization and breakdown field.
- Experimentally, Bi3NdTi4O12 films achieved an ultrahigh energy density of 131 J cm⁻³ with 81.6% efficiency.
Conclusions:
- A balance of amorphous and crystalline phases, specifically small grain sizes and moderate crystallinity, is crucial for high dielectric energy storage.
- Microstructure design offers a simple and effective strategy to substantially enhance dielectric energy storage performance.
- The findings guide the development of advanced dielectric materials for energy storage applications.
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