Ultrahigh Energy Storage in Aurivillius‐Phase Dielectric Thin Films Through Multiscale Optimization Design
Year: 2025
Type: article
Abstract: Electrostatic capacitors with the highest power densities, high‐voltage endurance, and a long lifetime are integral energy storage components for application in wind turbine generators, grid‐connected photovoltaics, and high‐frequency inverters. However, realizing ultrahigh recoverable energy storage density (Wrec > 100 J cm−3) combined with exceptional efficiency (η > 80%) is still a long‐standing challenge. Herein, a high‐performance Ba2Bi4Ti5O18 (BBPT) Aurivillius‐phase ferroelectric thin film achieved through multiscale optimization design is presented. The Pr3+ substitution in BBPT thin film effectively modulates lattice distortion, band‐gap Eg, and leakage current density, achieving optimal balance between polarization and breakdown strength. Accordingly, an ultrahigh discharged energy density (Wrec) of ≈142 J cm−3 is achieved, accompanied by a high efficiency of around 88.3%, representing a significant breakthrough in the comprehensive energy storage performance of lead‐free ferroelectric thin films. Especially, when the value of η >90% of their thin film, the high Wrec value of around 100 J cm−3 is still realized. The present research opens up a generalizable approach for designing ferroelectric thin films to develop next‐generation high‐performance energy storage devices applications.
Source: Small
Institutions: Tongji University, Ningbo University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4413257422