Achieving high energy storage properties in perovskite oxide via high-entropy design

The effect of non-intrinsic factors on pulse discharge and energy releasing performance of dielectric ceramics

“…All samples are at the same electric field strength, so thicker samples have higher cross-sample voltages. Quantitative calculation is performed using eqn (7).…”

“…Relaxor ferroelectric ceramics have attracted much attention because of their high energy density. [1][2][3][4][5] Traditionally, energy storage performance is measured by the P-E loop; [6][7][8][9][10][11][12][13][14] however, the charge and discharge period of the P-E loop test method is longer, which is much longer than the actual capacitor discharge time (ns-ms), 15 and the energy density is usually obtained by assuming that the system is in a quasi-state, which is not completely the same as the electrical energy that can be released in practical applications, especially for high-frequency discharge processes. In order to solve this problem, a new pulse discharge performance test method, RLC charge and discharge test, has been proposed in recent years and has been widely used.…”

Prominent energy storage density and efficiency of Na0.5Bi0.5TiO3‐based ceramics via multiscale amelioration strategy

“…35,36 Based on previous studies, the bandgap width is one of the key factors affecting the E b . [36][37][38][39][40] Figure 4(A) shows the bandgap width of (1-x)NBLBT-xSANT ceramics, inset is UV-Vis absorbance spectra. The value of E g was fittted by the following formula 41,42 :…”

“…28,34,43 In addition, the large bandgap width is beneficial to improve insulation characteristics and intrinsic resistance, which leads to the enhancement of E b . 39,44 However, the value of E g slightly suppresses from 3.21 eV to 3.19 eV, which is related to donor doping and abnormal grain growth, 28 resulting in a decrease in E b for x = 0.20. In addition, the leakage current density is also an important factor affecting the E b of ceramics.…”

High‐performance ferroelectric based materials via high‐entropy strategy: Design, properties, and mechanism

“…The schematic diagram of adjusting local polarization configuration via high‐entropy strategy to meet the multiparameters requirement for excellent comprehensive energy storage properties is given in Figure 10. For example, in Ti‐based perovskites, increased local polarization disorder can be realized through A‐site substitution using multiple exotic atoms (Figure 10A), leading to a slim P ‐ E loop with both high W rec and η values in (Na 0.2 Bi 0.2 Ba 0.2 Sr 0.2 Ca 0.2 )TiO 3 , 53,90,120,121 (NaBaBi) x (SrCa) (1−3 x )/2 TiO 3 , 122 and (La,Li) x [(Bi,Na)BaSrCa] 1− x TiO 3 ceramics 123 . To show the influence of configuration entropy on the energy storage properties, (Bi 0.5 Na 0.5 )(Ti 1−2 x Fe x Nb x )O 3 (i.e., (1 − 2 x )BNT‐ x BF‐ x NN ternary system) ceramics with Δ S ranging from 0.69R to 1.79R were meticulously designed and studied systematically 124 .…”