0.74NaNbO3-0.26Sr(Mg1/3Nb2/3)O3 lead-free dielectric ceramics with high energy storage properties

作者：Dong, Qinpeng; Dong, Xiaoyan; Pan, Yue; Wang, Xiang; Wang, Jiaming; Nong, Peng; Xu, Mingzhao; Zeng, Dafu; Deng, Lian; Zhang, Hailin^*; Zhou, Huanfu; Chen, Xiuli^*

来源：Ceramics International, 2023, 49(5): 8081-8087.

DOI：10.1016/j.ceramint.2022.10.328

• NaNbO3 ceramic
• Energy storage density
• Charge-discharge

Sodium niobate (NaNbO3) ceramics are commonly investigated for use as energy storage ceramics because of their excellent properties. NaNbO3 ceramics are modified mainly by doping with a Bi-based composite perov-skite, that is, by the nonequivalent doping of Bi3+ at the A site of the NaNbO3 ceramic. In addition, the high volatility of Bi at high temperatures increases the defects in the ceramics. This paper provides a new idea of doping modification of sodium NaNbO3-based energy storage ceramics. Here, (1-x)NaNbO3-xSr(Mg1/3Nb2/3)O3 (x = 0.17, 0.20, 0.23, 0.26) ceramics were prepared by doping NaNbO3 with an Sr-based composite perovskite. Compared with Bi-based composite perovskite, Sr-based composite perovskite doping of NaNbO3 ceramics can also obtained good energy storage properties: a total energy storage density of 4.28 J/cm3 and an energy storage efficiency of 89.3%. In addition, the ceramics exhibited good frequency stability (2-200 Hz) and a high charge/ discharge rate (1.06 mu s).

• 单位
  桂林理工大学