A Lead‐Free and High‐Energy Density Ceramic for Energy Storage Applications

Abstract

In this work, we demonstrate a very high‐energy density and high‐temperature stability capacitor based on SrTiO3‐substituted BiFeO3 thin films. An energy density of 18.6 J/cm3 at 972 kV/cm is reported. The temperature coefficient of capacitance (TCC) was below 11% from room temperature up to 200°C. These results are of practical importance, because it puts forward a promising novel and environmentally friendly, lead‐free material, for high‐temperature applications in power electronics up to 200°C. Applications include capacitors for low carbon vehicles, renewable energy technologies, integrated circuits, and for the high‐temperature aerospace sector.

Giant Electric Energy Density in Epitaxial Lead‐Free Thin Films with Coexistence of Ferroelectrics and Antiferroelectrics

“…[1][2][3] These capacitors could fi nd applications in defi brillators, detonators, power electronics, etc. that require high power density.…”

“…that require high power density. [1][2][3] However, compared with fuel cells, Li-ion batteries, and supercapacitors, the dielectric capacitors have the…”

“…[ 11,12 ] With the development of high-quality thin fi lms by sol-gel, pulsed laser deposition (PLD), molecular beam epitaxy, etc., large energy density, mainly in lead-based antiferroelectric thin fi lms, has been achieved due to the higher dielectric breakdown strength (>500 kV cm −1 ). [ 3,9,13,14 ] For example, a high energy density of 53 J cm −3 at 3500 kV cm −1 was obtained in relaxor antiferroelectric (Pb 0.92 La 0.08 )(Zr 0.9 Ti 0.05 ) O 3 sol-gel thin fi lm. [ 9 ] However, widespread applications of lead-based materials are prohibited due to the toxicity of lead.…”

Dynamics of antipolar distortions

“…For instance, the Pnma state in ABO 3 perovskites is known to possess antipolar motions of its A cations and recent studies found that it can also adopt the double polarization-vs.-electric field hysteresis loop in some materials 13,14 that is characteristics of antiferroelectrics 15 -therefore suggesting that Pnma states in some perovskites can hold promise towards the design of energy storage devices with high energy densities and efficiencies. [16][17][18][19][20][21][22] Interestingly, all the aforementioned works on trilinear energetic couplings have been aimed at revealing and understanding resulting static properties. In other words, the effect of these original trilinear couplings on dynamics have been left out so far and are thus basically unknown, to the best of our knowledge.…”

Strongly enhanced dielectric and energy storage properties in lead-free perovskite titanate thin films by alloying

“…Dielectric capacitors are a promising technology for energy storage devices in high-power applications because of their high-power density, fast charge/discharge time (< 1 μs), low cost, and high thermal and mechanical stability [72][73][74][75][76]. The energy density (W) of a dielectric material is given by…”