Abstract
To improve the comprehensive energy storage performance of the BaTi0.97Ca0.03O2.97-based ceramics for pulse power capacitors, a typical bismuth-based high entropy compound, Bi(Li0.2Y0.2Mg0.2Ti0.2Ta0.2)O3 (BLYMTT) was introduced into 0.9Ba(Ti0.97Ca0.03)O3-0.1Bi0.55Na0.45TiO3 (0.9BTC-0.1BNT) matrix. The results indicate that the phase structure transforms from tetragonal phase to pseudo-cubic phase with increasing BLYMTT, and the relaxor ferroelectric behavior are also enhanced. The 0.91(0.9BTC-0.1BNT)-0.09BLYMTT ceramic simultaneously achieves a high energy storage density of 4.89 J/cm3 and efficiency of 91.2% at electric field of 240 kV/cm. Moreover, the 0.91(0.9BTC-0.1BNT)-0.09BLYMTT ceramic also exhibits superior temperature (30–100 ℃) and frequency (1–100 Hz) stability, as well as the ultrahigh power density of PD~66.01 MW/cm3 and rapid discharge rate of t0.9~97 ns at 140 kV/cm, which is of great potential for energy storage application.
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