scholarly journals Remarkably enhanced dielectric stability and energy storage properties in BNT—BST relaxor ceramics by A-site defect engineering for pulsed power applications

2022 ◽  
Vol 11 (2) ◽  
pp. 283-294
Author(s):  
Zhipeng Li ◽  
Dong-Xu Li ◽  
Zong-Yang Shen ◽  
Xiaojun Zeng ◽  
Fusheng Song ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Field ◽  
Thermal Evolution ◽  
Temperature Stability ◽  
Electric Polarization ◽  
Pulsed Power ◽  
Lead Free ◽  
High Temperature Stability ◽  
Defect Engineering ◽  
A Site

AbstractLead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density (Wrec) especially at low electric field condition. To address this challenge, we propose an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions, in which $${\rm{B}}{{\rm{a}}_{0.105}}{\rm{N}}{{\rm{a}}_{0.325}}{\rm{S}}{{\rm{r}}_{0.245 - 1.5x}}{_{0.5x}}{\rm{B}}{{\rm{i}}_{0.325 + x}}{\rm{Ti}}{{\rm{O}}_3}$$ Ba 0.105 Na 0.325 Sr 0.245 − 1.5 x □ 0.5 x Bi 0.325 + x TiO 3 ($${\rm{BN}}{{\rm{S}}_{0.245 - 1.5x}}{_{0.5x}}{{\rm{B}}_{0.325 + x}}{\rm{T}}$$ BNS 0.245 − 1.5 x □ 0.5 x B 0.325 + x T , x = 0, 0.02, 0.04, 0.06, and 0.08) lead-free ceramics are selected as the representative. The $${\rm{BN}}{{\rm{S}}_{0.245 - 1.5x}}{_{0.5x}}{{\rm{B}}_{0.325 + x}}{\rm{T}}$$ BNS 0.245 − 1.5 x □ 0.5 x B 0.325 + x T ceramics are prepared by using pressureless solid-state sintering and achieve large Wrec (1.8 J/cm3) at a low electric field (@110 kV/cm) when x = 0.06. The value of 1.8 J/cm3 is super high as compared to all other Wrec in lead-free bulk ceramics under a relatively low electric field (< 160 kV/cm). Furthermore, a high dielectric constant of 2930 within 15% fluctuation in a wide temperature range of 40–350 °C is also obtained in $${\rm{BN}}{{\rm{S}}_{0.245 - 1.5x}}{_{0.5x}}{{\rm{B}}_{0.325 + x}}{\rm{T}}$$ BNS 0.245 − 1.5 x □ 0.5 x B 0.325 + x T (x = 0.06) ceramics. The excellent performances can be attributed to the A-site defect engineering, which can reduce remnant polarization (Pr) and improve the thermal evolution of polar nanoregions (PNRs). This work confirms that the $${\rm{BN}}{{\rm{S}}_{0.245 - 1.5x}}{_{0.5x}}{{\rm{B}}_{0.325 + x}}{\rm{T}}$$ BNS 0.245 − 1.5 x □ 0.5 x B 0.325 + x T (x = 0.06) ceramics are desirable for advanced pulsed power capacitors, and will push the development of a series of Bi0.5Na0.5TiO3 (BNT)-based ceramics with high Wrec and high-temperature stability.

Remarkably Enhanced Dielectric Stability and Energy Storage Properties in BNT-BST Relaxor Ceramics by A-Site Defect Engineering for Pulsed Power Applications

2021 ◽  
Author(s):  
Zhipeng Li ◽  
Dongxu Li ◽  
Zong-Yang Shen ◽  
Xiaojun Zeng ◽  
Fusheng Song ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Field ◽  
Thermal Evolution ◽  
Temperature Stability ◽  
Electric Polarization ◽  
Pulsed Power ◽  
Lead Free ◽  
High Temperature Stability ◽  
Defect Engineering ◽  
A Site

Abstract Lead-free bulk ceramics for advanced pulsed power capacitors show relatively low recoverable energy storage density (Wrec) especially at low electric field condition. To address this challenge, we proposed an A-site defect engineering to optimize the electric polarization behavior by disrupting the orderly arrangement of A-site ions, in which Ba0.105Na0.325Sr0.245−1.5xð0.5xBi0.325+xTiO3 (BNS0.245−1.5xð0.5xB0.325+xT, x = 0, 0.02, 0.04, 0.06, 0.08) lead-free ceramics were selected as the representative. The BNS0.245−1.5xð0.5xB0.325+xT ceramics were prepared by using pressureless solid state sintering and achieved large Wrec (1.8 J/cm3) at a low electric field (@110 kV/cm) when x = 0.06. The value of 1.8 J/cm3 is super high as compared to all other Wrec in lead-free bulk ceramics under a relatively low electric field (< 160 kV/cm). Furthermore, a high dielectric constant of 2930 ± 15% in a wide temperature range of 40 ~ 350°C was also obtained in BNS0.245−1.5xð0.5xB0.325+xT (x = 0.06) ceramics. The excellent performances can be attributed to the A-site defect engineering, which can reduce Pr and improve the thermal evolution of polar nanoregions (PNRs). This work confirms that the BNS0.245−1.5xð0.5xB0.325+xT (x = 0.06) ceramics are desirable for advanced pulsed power capacitors, and will push the development of a series of BNT-based ceramics with high Wrec and high temperature stability.

An Sr doping 0.65(Bi0.5Na0.5) TiO3-0.35 (Sr0.7+x+ Bi0.2) TiO3 Ceramic with Tunable Crystal Structures and Energy Storge Performances

2021 ◽  
Author(s):  
Yiming Liu ◽  
Weimin Xia ◽  
Zhizhong Li ◽  
Danfeng Lu ◽  
Yan Feng
Keyword(s):  
Grain Size ◽  
Energy Storage ◽  
Electric Field ◽  
Temperature Stability ◽  
Composite Ceramic ◽  
Electric Polarization ◽  
Ferroelectric Ceramics ◽  
Charge Fluctuation ◽  
Average Grain Size ◽  
A Site

Abstract A series of 0.65(Bi0.5 Na0.5 )TiO3 -0.35(Sr0.7+x +Bi0.2 )TiO3 (BNT-S0.7+x BT) composite ceramic pellets are synthesized using the traditional solid sintering method, where a tunable x, that is the changeable volume of Sr, is expected to tailor energy storage through the adjustments of the A-site stoichiometry in BNT-S0.7+x BT. We find that a small excess of Sr2+ ions results in an extensively tunning on the crystal grain size and even contributes to the A-site disorder and charge fluctuation of BNT-S0.7+x BT. As such, the BNT-S0.7+x BT exhibits a minimum average grain size and a highly compact crystal morphology. Meanwhile, a relatively thin polarization-electric field (P-E) loop with a high maximum polarization of 42μC/cm2 and a low remnant electric polarization of 5μC/cm2 are obtained in a BNT-S0.75 BT sample under 100 kV/cm, which corresponds to a large energy density of 9.81 J cm-3 . Attractively, this ceramic possesses an excellent temperature stability of polarization performances and strain under high electric field of 100kV/cm, which favors of the energy storage of relaxor ferroelectric ceramics and is valuable to a supercapacitor serving at evaluated high temperature.

scholarly journals Excellent Energy Storage Performance in NaNbO3-Based Relaxor Antiferroelectric Ceramics Under a Low Electric Field

2021 ◽  
Author(s):  
Xuxin Cheng ◽  
Pengyuan Fan ◽  
Xiaoming Chen
Keyword(s):  
Energy Storage ◽  
Electric Field ◽  
Low Cost ◽  
Temperature Stability ◽  
High Energy ◽  
Pulsed Power ◽  
Pure Perovskite Structure ◽  
Stable Performance ◽  
Energy Storage Efficiency ◽  
Storage Property

Abstract NaNbO3-based antiferroelectric (AFE) ceramics have the prominent advantages of stable performance and low cost. However, its energy storage property is often remarkably limited by the hysteresis of the antiferroelectric to ferroelectric phase transformation. In this work, 0.88Na(Nb1 − xTax)O3–0.12Bi0.2Sr0.7TiO3 (x = 0–0.075) antiferroelectric ceramics were synthesized using a conventional mixed oxide route. Ta5+ were completely dissolved into the lattice of 0.88NaNbO3–0.12Bi0.2Sr0.7TiO3 to form a pure perovskite structure. With increased Ta content, the AFE orthogonal P phase was replaced by AFE orthogonal R phase progressively. Meanwhile, the dielectric constant curve showed relaxor-like properties. As a result, slender P–E curves with reduced hysteresis loss and decreased residual polarization were achieved. Interestingly, a large recoverable energy storage density (Wrec ≈ 2.16 J cm− 3) and high energy storage efficiency (η ≈ 80.7%) were obtained simultaneously under a low driving electric field of 15 kV mm− 1 at doping ratio (x) of 0.075. In addition, the 0.88Na(Nb0.925Ta0.075)O3–0.12Bi0.2Sr0.7TiO3 sample exhibited excellent temperature stability, indicating an ideal candidate in future pulsed power capacitor.

scholarly journals Progress and perspectives in dielectric energy storage ceramics

2021 ◽  
Vol 10 (4) ◽  
pp. 675-703
Author(s):  
Dongxu Li ◽  
Xiaojun Zeng ◽  
Zhipeng Li ◽  
Zong-Yang Shen ◽  
Hua Hao ◽  
...  
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Temperature Stability ◽  
Pulse Power ◽  
Research Progress ◽  
High Temperature Stability ◽  
Dielectric Ceramic ◽  
Microstructural Design ◽  
Pulse Power Systems ◽  
Fatigue Endurance

AbstractDielectric ceramic capacitors, with the advantages of high power density, fast charge-discharge capability, excellent fatigue endurance, and good high temperature stability, have been acknowledged to be promising candidates for solid-state pulse power systems. This review investigates the energy storage performances of linear dielectric, relaxor ferroelectric, and antiferroelectric from the viewpoint of chemical modification, macro/microstructural design, and electrical property optimization. Research progress of ceramic bulks and films for Pb-based and/or Pb-free systems is summarized. Finally, we propose the perspectives on the development of energy storage ceramics for pulse power capacitors in the future.

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