TY - JOUR
T1 - Synergistic high-entropy engineering and grain boundary engineering enable wide-temperature stable BiFeO3-based ceramics with ultrahigh energy storage density
AU - Zhang, Jinbo
AU - Pu, Yongping
AU - Hao, Yuxin
AU - Yang, Yile
AU - Han, Yu
AU - Zhang, Lei
AU - Wang, Bo
AU - Liu, Zenghui
N1 - Publisher Copyright:
© 2025 Elsevier B.V.
PY - 2025/9/15
Y1 - 2025/9/15
N2 - Simultaneously achieving concurrent optimization of polarization difference (ΔP) and breakdown strength (Eb) remains pivotal yet challenging for advanced energy-storage capacitors. This study proposed a materials design strategy integrating high-entropy composition and liquid-phase sintering to address this bottleneck. The (Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)(Ti0.8Zr0.2)O3 (NBBSCZ) high-entropy system was incorporated into the 0.67BiFeO3–0.33BaTiO3 matrix. Ionic-radius and valence states disparities induced localized chemical disorder and random electric fields, shifting the freezing temperature near room temperature and promoting the formation of rapidly responsive polar nanoregions (PNRs). The subsequent introduction of the low-melting-point sintering aid BaCu(B2O5) (BCB) reduced sintering temperature by ∼150 °C and achieved a remarkable 5.39-fold grain refinement. This significantly enhanced grain-boundary resistivity, mitigated space-charge accumulation at interfaces and promoted a more uniform electric field distribution. Through the synergistic optimization, the NBBSCZ-0.12-BCB ceramic delivers an ultrahigh recoverable energy density (Wrec = 7.25 J/cm3) under an ultra-high Eb (∼465 kV/cm), representing a 4.29-fold improvement. This work provides an effective pathway to balance the polarization and breakdown in energy storage applications.
AB - Simultaneously achieving concurrent optimization of polarization difference (ΔP) and breakdown strength (Eb) remains pivotal yet challenging for advanced energy-storage capacitors. This study proposed a materials design strategy integrating high-entropy composition and liquid-phase sintering to address this bottleneck. The (Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)(Ti0.8Zr0.2)O3 (NBBSCZ) high-entropy system was incorporated into the 0.67BiFeO3–0.33BaTiO3 matrix. Ionic-radius and valence states disparities induced localized chemical disorder and random electric fields, shifting the freezing temperature near room temperature and promoting the formation of rapidly responsive polar nanoregions (PNRs). The subsequent introduction of the low-melting-point sintering aid BaCu(B2O5) (BCB) reduced sintering temperature by ∼150 °C and achieved a remarkable 5.39-fold grain refinement. This significantly enhanced grain-boundary resistivity, mitigated space-charge accumulation at interfaces and promoted a more uniform electric field distribution. Through the synergistic optimization, the NBBSCZ-0.12-BCB ceramic delivers an ultrahigh recoverable energy density (Wrec = 7.25 J/cm3) under an ultra-high Eb (∼465 kV/cm), representing a 4.29-fold improvement. This work provides an effective pathway to balance the polarization and breakdown in energy storage applications.
KW - Excellent energy-storage performance
KW - High-entropy engineering
KW - Liquid phase sintering
KW - Synergistic optimization strategy
KW - Wide-temperature stability
UR - https://www.scopus.com/pages/publications/105011765242
U2 - 10.1016/j.cej.2025.166438
DO - 10.1016/j.cej.2025.166438
M3 - 文章
AN - SCOPUS:105011765242
SN - 1385-8947
VL - 520
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 166438
ER -