Yang Huijing, Lu Zhilun, Li Linhao, Bao Weichao, Ji Hongfen, Li Jinglei, Feteira Antonio, Xu Fangfang, Zhang Yong, Sun Huajun, Huang Zhichao, Lou Weichao, Song Kaixin, Sun Shikuan, Wang Ge, Wang Dawei, Reaney Ian M
Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, U.K.
Department of Physics, Tangshan Normal University, Tangshan 063000, China.
ACS Appl Mater Interfaces. 2020 Sep 30;12(39):43942-43949. doi: 10.1021/acsami.0c13057. Epub 2020 Sep 21.
Ceramic dielectrics are reported with superior energy storage performance for applications, such as power electronics in electrical vehicles. A recoverable energy density () of ∼4.55 J cm with η ∼ 90% is achieved in lead-free relaxor BaTiO-0.06Bi(MgNb)O ceramics at ∼520 kV cm. These ceramics may be co-fired with Ag/Pd, which constitutes a major step forward toward their potential use in the fabrication of commercial multilayer ceramic capacitors. Compared to stoichiometric Bi(MgNb)O-doped BaTiO (BT), A-site deficient Bi(MgNb)O reduces the electrical heterogeneity of BT. Bulk conductivity differs from the grain boundary only by 1 order of magnitude which, coupled with a smaller volume fraction of conducting cores due to enhanced diffusion of the dopant via A-site vacancies in the A-site sublattice, results in higher breakdown strength under an electric field. This strategy can be employed to develop new dielectrics with improved energy storage performance.
据报道，陶瓷电介质在诸如电动汽车中的电力电子等应用中具有卓越的储能性能。在无铅弛豫铁电体BaTiO₃-0.06Bi(Mg₁/₂Nb₁/₂)O₃陶瓷中，在约520 kV/cm的电场下实现了约4.55 J/cm³的可恢复能量密度（）和约90%的效率。这些陶瓷可以与Ag/Pd共烧，这朝着它们在商业多层陶瓷电容器制造中的潜在应用迈出了重要一步。与化学计量比的Bi(Mg₁/₂Nb₁/₂)O₃掺杂的BaTiO₃（BT）相比，A位缺陷的Bi(Mg₁/₂Nb₁/₂)O₃降低了BT的电学不均匀性。体电导率与晶界电导率仅相差1个数量级，再加上由于掺杂剂通过A位亚晶格中的A位空位增强扩散导致导电核心的体积分数较小，使得在电场下具有更高的击穿强度。该策略可用于开发具有改进储能性能的新型电介质。
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