Recently, XJTU associate professor Li Fei, member of professor Xu Zhuo’s research group from the School of Electronic and Information Engineering, XJTU, guided students in the investigation of a lead‐free dielectric ceramic under (Na0.5Bi0.5)TiO3‐x(Sr0.7Bi0.2)TiO3(NBT‐SBT) system, simultaneously achieving high energy density and high efficiency of energy storage. The main principle is to destroy the long-range order of antiferroelectric materials dipole by means of A-site heterovalent cation, so as to realize the structural inhomogeneity of antiferroelectric materials on the nanometer scale, reducing the lag of polarization intensity relative to electric field and improving the efficiency of energy storage. Based on the NBT-SBT system, Prof. Xu Zhuo’s group prepared MLCC (multilayer ceramic capacitor) using the tape casting technology, with the energy density and efficiency respectively of 9.5Jcm-3 and 92％. Furthermore, the newly developed capacitor exhibits a good stability in the temperature range of ‐60 to 120 °C, with the energy density variation less than 10% and the energy density degradation of less than 8% over 1 million charge-discharge cycles. These characteristics demonstrate that the NBT-SBT MLCC has a promising application in the high energy storage field.
The study was published online in the Advanced Materials (IF=21.95), a well-known journal in the material science field. Doctoral candidate Li Jinglei from the Key Laboratory of the Ministry of Education and International Center for Dielectric Research of the School ofElectronic and Information Engineering of XJTU is the first author. XJTU associate professor Li Fei and professor Zhang Shujun from the University of Wollongong, Australia, are the corresponding authors, and XJTU is the only undersigned institution of this article.
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