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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Relaxor-ferroelectric superlattices: high energy density capacitors
1Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR 00931-3343, USA.
Summary
We report high energy density and breakdown electric fields in laser ablated barium titanate/barium strontium titanate (BT/BST) relaxor-ferroelectric superlattices. These materials exhibit promising properties for advanced dielectric applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Relaxor-ferroelectric superlattices (SLs) exhibit unique dielectric properties.
- Barium titanate (BaTiO3) and barium strontium titanate (Ba(1-x)Sr(x)TiO3) are key materials in ferroelectric research.
Purpose of the Study:
- To investigate the breakdown electric field and energy density of laser ablated BT/BST relaxor-ferroelectric superlattices.
- To characterize the dielectric behavior and ferroelectric properties under high electric fields.
Main Methods:
- Growth of BT/BST superlattices on MgO substrates using laser ablation.
- Dielectric spectroscopy to analyze frequency and temperature dependence.
- Ferroelectric hysteresis loop measurements to determine energy density.
- Current-voltage characteristic measurements to assess breakdown field.
Main Results:
- The superlattices exhibit relaxor-like dielectric behavior with frequency dispersion and low dielectric loss.
- Well-saturated ferroelectric hysteresis loops show high energy density (up to 12.24 J cm(-3), extrapolated to 46 J cm(-3)).
- Exceptionally high breakdown electric fields (5.8-6.0 MV cm(-1)) and low current densities near breakdown were observed.
Conclusions:
- BT/BST superlattices demonstrate significant potential for high energy density storage applications.
- The materials possess excellent dielectric and ferroelectric properties suitable for high-field applications.
- Space charge limited conduction mechanism governs behavior at very high voltages.
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