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Improved energy storage density and efficiency of (1− x )Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 - x BiMg 2/3 Nb 1/3 O 3 lead-free ceramics

Chemical Engineering Journal, ISSN: 1385-8947, Vol: 410, Page: 128341
2021
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Article Description

The improvement of energy density and efficiency is currently the main challenge in the application of lead-free dielectric energy-storage materials. Relaxor ferroelectric ceramics are the most commonly selected materials for pulsed power capacitors because of their inherent advantages, such as ultra-high power density, fast charging/discharging, and long lifetime. In this study, BiMg 2/3 Nb 1/3 O 3 (BMN) was doped to enhance energy density and efficiency in the (1− x )Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 - x BiMg 2/3 Nb 1/3 O 3 systems based on the adjusted breakdown strength and polarization. As a result, a giant recoverable energy density of 3.81 J/cm 3 and a high energy efficiency of 90.5% were simultaneously achieved in the 0.925BCZT-0.075BMN ceramic, which the energy density is 26 times as large as that of BCZT ceramic. Excellent temperature (−25 to 100 °C) and frequency (1–100 Hz) stability of recoverable energy density and energy efficiency were confirmed with the fluctuations below 4.5%. Domain engineering on the nanoscale was designed in relaxor ferroelectrics, which effectively improved the energy storage performance. Our study provides a feasible guideline to develop lead-free ceramics for electrical energy storage applications.

Bibliographic Details

Zhonghua Dai; Jinglong Xie; Zhaobing Chen; Shun Zhou; Jingjing Liu; Weiguo Liu; Zengzhe Xi; Xiaobing Ren

Elsevier BV

Chemistry; Environmental Science; Chemical Engineering; Engineering

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