Enhanced Energy Storage Properties in Paraelectrics via Entropy Engineering

Abstract

Electrostatic energy storage capacitors based on dielectrics have attracted much attention due to their wide applications in advanced electrical technology and electronic devices. Generally, high energy density is achieved at a high electric field, while conduction loss becomes nonnegligible, which harms practical applications. Here distinctly suppressed leakage current in BaZr0.5Ti0.5O3‐based films by entropy engineering is realized. With increased entropy, the leakage current density decreases by two orders of magnitude at the electric field of 3 MV cm−1, leading to a markedly improved energy efficiency of 87% at an ultrahigh breakdown strength of 8 MV cm−1 in high‐entropy films. Thereby, a high energy density of 51.9 J cm−3 is achieved. This work demonstrates the effectiveness of entropy engineering in improving the breakdown strength of dielectric films and shows great potential in enhancing the energy storage performance of capacitors.

Ultrahigh energy storage in high-entropy ceramic capacitors with polymorphic relaxor phase

“…Furthermore, we conducted high-entropy design on the basis of the PRP structure, which can help to greatly enhance the breakdown strength due to the strengthening of the electron scattering and the reduction of the leakage current, because the high-entropy induced large lattice distortion and smaller grain size lead to enhanced transport barriers (Fig. 1C) ( 18 – 21 ). Hence, this synergistic strategy combining PRP and high-entropy design could potentially achieve a high U e and an ultrahigh η (Fig.…”