Achieving High Energy Storage Performance in Lead-Free Relaxor Ferroelectric Ceramics of (1-x)Bi0.88Nd0.10Sm0.02FeO3-xBaTiO3

Houren Wei; Zaiwen Yang

doi:10.62051/ijepes.v2n1.09

Authors

Houren Wei
Zaiwen Yang

DOI:

https://doi.org/10.62051/ijepes.v2n1.09

Keywords:

BiFeO3 Ceramics, Relaxor Ferroelectric Ceramics, Energy Storage, Nanocluster Structure, Storage Efficiency

Abstract

BiFeO₃-based lead-free ferroelectrics have attracted great interest in energy storage applications due to their high spontaneous polarisation strength, however, the high residual polarisation strength (P_r) has become a serious obstacle to their practical application. In this work, (1-x)Bi_0.88Nd_0.10Sm_0.02FeO₃-xBaTiO₃+0.1 wt% MnO₂ ceramics were designed by ion doping and solid solution modification strategies, where Sm³⁺ and Nd³⁺ promote ionic disorder and reduce leakage current, and the introduction of nano-BaTiO₃ induces the crushing of long-range ferroelectric structure into polar nano-regions with enhanced relaxation. As a result, the ceramic is able to maintain a high maximum polarisation intensity while possessing a low residual polarisation.The recoverable energy density (W_rec) of the 0.50BSNF-0.50BT ceramic is as high as 3.61 J/cm³ with an efficiency of 70.11%. In addition, the 0.50BSNF-0.50BT has good thermal stability (W_rec variation <7%) at 25-120°C. In the charge/discharge test, the W_dis was 2.58 J/cm³ and the discharge time was 273 ns. These results indicate that the 0.50BSNF-0.50BT ceramic is an ideal candidate as a material for energy storage applications.

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