材料科学
储能
陶瓷
电容器
铁电性
热稳定性
极化(电化学)
电场
电介质
脉冲功率
兴奋剂
铁电陶瓷
电压
复合材料
光电子学
电气工程
热力学
功率(物理)
化学工程
化学
工程类
物理化学
物理
量子力学
作者
Mengshan Wang,Aiwen Xie,Jian Fu,Ruzhong Zuo
标识
DOI:10.1016/j.cej.2022.135789
摘要
Achieving high overall energy-storage properties under moderate electric fields is of great significance for practical applications of energy-storage ceramic capacitors. In this work, an ultrahigh recoverable energy-storage density (Wrec) of ∼ 3.9 J/cm3 and a high energy-storage efficiency (η) of ∼ 80% are simultaneously achieved under a moderate electric field of 25 kV/mm in a new ternary lead-free relaxor ferroelectric (FE) ceramic of 1 wt.%Nb2O5-doped 0.46Bi1.02FeO3-0.29BaTiO3-0.25Bi0.5Na0.5TiO3 (BF-BT-BNT). Together with excellent thermal and frequency stability of Wrec = 1.68 ± 12% J/cm3, η = 90 ± 9%, 0.1–100 Hz; Wrec = 1.61 ± 6% J/cm3, η = 87 ± 5% within 30–170 °C, a large power density of PD ∼ 43.0 MW/cm3 and a fast discharge rate of t0.9 ∼ 45 ns, Nb2O5-doped BF-BT-BNT ceramics exhibit promising potentials for environment-friendly advanced pulsed power capacitors. Multiscale structure characterization reveals that the incorporation of Nb2O5 into BF-BT-BNT significantly increases the local structure disorder, leading to a heterogeneous nanodomain morphology. This makes the Nb2O5-doped BF-BT-BNT ceramic maintain a high maximum polarization, but obviously suppressed polarization hysteresis, thus responsible for significantly improved overall energy-storage properties.
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