Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-Bi<sub>3.25</sub>La<sub>0.75</sub>Ti<sub>3</sub>O<sub>12</sub> Lead-Free Thin Films for Energy Storage Applications through Nanodomain Design
oleh: Wenfeng Yue, Tingting Jia, Yanrong Chen, Wenbin Dai, Liang Yu, Yali Cai, Ting Li, Lixia Liu, Quansheng Guo, Shuhui Yu
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2022-10-01 |
Deskripsi
Dielectric capacitors have received increasing attention due to their high power density. The Bi-based Aurivillius phase compound Bi<sub>3.25</sub>La<sub>0.75</sub>Ti<sub>3</sub>O<sub>12</sub> (BLT) is considered a potential material in the field of energy storage due to its excellent ferroelectric properties and good fatigue resistance, and temperature stability. In this paper, 0.4Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>-0.6Bi<sub>3.25</sub>La<sub>0.75</sub>Ti<sub>3</sub>O<sub>12</sub> (0.4NBT4BNT-0.6BLT)-thin films were prepared on Pt/Ti/SiO<sub>2</sub>/Si substrates with the sol-gel method. The addition of BNT destroys the long-range ferroelectric order of BLT and forms nanodomains. By increasing the BNT content, the BLT is transformed from a ferroelectric state to a relaxed state, and its application in the field of energy storage is realized. The recoverable energy density is 42.41 J/cm<sup>3</sup>, and the recoverable energy storage density is relatively stable in the range of 25–200 °C with good thermal stability. The energy storage efficiency is 75.32% at ~2663 kV/cm. The leakage current density at 300 kV/cm is 1.06 × 10<sup>−9</sup> A/cm<sup>2</sup>.