Bi_(0.5)Na_(0.5)TiO_(3)(BNT)-based lead-free ceramics with superior ferroelectric properties are considered to be extremely advantageous in energy storage capacitors for future green technologies.Here,we demonstrate a...Bi_(0.5)Na_(0.5)TiO_(3)(BNT)-based lead-free ceramics with superior ferroelectric properties are considered to be extremely advantageous in energy storage capacitors for future green technologies.Here,we demonstrate an approach to achieve both ultrahigh energy density W_(rec)and efficiencyηby regulating the multiscale electropolar structures and microstructure.A satisfactory energy storage performance of a high W_(rec)of 4.02 J·cm^(-3),and a decentηof 80%under 415 kV·cm^(-1)are attained in the 0.5(BNT-CS)-0.5SB_(0.2)T ceramic(abbreviated as BNT-0.2SBT).Moreover,BNT-0.2SBT exhibits superior power density(P_(D)=107MW·cm^(-3)),ultrafast discharge time(t_(0.9)=116 ns)at 150 kV·cm^(-1),and good temperature stability.The findings in this work not only demonstrate that a valid candidate,but also provide a new idea of how to achieve both high-energy storage density and efficiency in lead-free ferroelectric materials.展开更多
基金supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.52272119,52202143)Natural Science Basic Research Plan in the Shaanxi Province of China(Grant Nos.2022JQ338)+2 种基金Young Talent Fund of University Association for Science and Technology in Shaanxi,China(20230415)the Excellent Graduate Training Program of Shaanxi Normal University(Grant No.LHRCCX23221)the Fundamental Innovation Project in School of Materials Science and Engineering(SNNU).
文摘Bi_(0.5)Na_(0.5)TiO_(3)(BNT)-based lead-free ceramics with superior ferroelectric properties are considered to be extremely advantageous in energy storage capacitors for future green technologies.Here,we demonstrate an approach to achieve both ultrahigh energy density W_(rec)and efficiencyηby regulating the multiscale electropolar structures and microstructure.A satisfactory energy storage performance of a high W_(rec)of 4.02 J·cm^(-3),and a decentηof 80%under 415 kV·cm^(-1)are attained in the 0.5(BNT-CS)-0.5SB_(0.2)T ceramic(abbreviated as BNT-0.2SBT).Moreover,BNT-0.2SBT exhibits superior power density(P_(D)=107MW·cm^(-3)),ultrafast discharge time(t_(0.9)=116 ns)at 150 kV·cm^(-1),and good temperature stability.The findings in this work not only demonstrate that a valid candidate,but also provide a new idea of how to achieve both high-energy storage density and efficiency in lead-free ferroelectric materials.
