Abstract
Lead-free ceramic capacitors with large energy storage density and efficiency synchronously under moderate electric fields is a challenging. In this work, a pathway of configuration entropy modulation (ΔSconfig) overcomes this challenge. The (1-x)(Na0.5Bi0.47La0.03)0.94Ba0.06TiO3-xSr(Sn0.2Ti0.2Al0.2Ta0.2Hf0.2)O3 ceramics were successfully synthesized. With the system ΔSconfig increases from 0.98 R to 1.79 R. The 0.85 NBLBT-0.15 SSTATH ceramic obtains a large recoverable energy density (Wrec = 4.28J/cm3) and ultra-high efficiency (η = 92.6%) under 260 kV/cm. The implementation of prominent energy storage performance can be attributed to the refinement of grain and domain size, and the increase of band gap and activation energy, which caused by the increase in ΔSconfig. More critically, the same composition also possesses great frequency (1–100 Hz) and thermal (20–140 °C) stability of energy storage performance as well as the high power density of PD ∼ 36.19 MW/cm3 and transient discharge rate of t0.9–44 ns at 120 kV/cm. This work shows that the regulation of ΔSconfig is an effective strategy to achieve outstanding energy storage properties under moderate electric fields.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
