Multilayer ceramic capacitors (MLCCs) for energy storage applications require a large discharge energy density and high discharge/charge efficiency under high electric fields. Here, 0.87BaTiO₃-0.13Bi(Zn_2/3(Nb_0.85Ta_0.15)_1/3)O₃ (BTBZNT) MLCCs with double active dielectric layers were fabricated, and the effects of inner electrode and sintering method on the energy storage properties of BTBZNT MLCCs were investigated. By using the pure Pt as inner electrode instead of Ag_0.6Pd_0.4 alloys, an alternating current (AC) breakdown strength (BDS) enhancement from 1047 to 1500 kV/cm was achieved. By investigating the leakage current behavior of BTBZNT MLCCs, the Pt inner electrode and two-step sintering method (TSS) were confirmed to enhance the Schottky barrier and minimize the leakage current density. With relatively high permittivity, dielectric sublinearity, and ultra-high BDS, the Pt TSS BTBZNT MLCCs exhibited a surprisingly discharge energy density (U_dis) of 14.08 J/cm³. Moreover, under an operating electric field of 400 kV/cm, the MLCCs also exhibited thermal stability with U_dis variation < ±8% over a wide temperature (t) range from -50 to 175 °C and cycling reliability with U_dis reduction < 0.3% after 3000 charge-discharge cycles. These remarkable performances make Pt TSS BTBZNT MLCCs promising for energy storage applications.

中文翻译：

---

具有薄介电层的0.87BaTiO 3 -0.13Bi（Zn 2/3（Nb 0.85 Ta 0.15）1/3）O 3多层陶瓷电容器的储能性能

储能应用中的多层陶瓷电容器（MLCC）需要大的放电能量密度和高电场下的高放电/充电效率。在此，制备了具有双活性介电层的0.87BaTiO ₃ -0.13Bi（Zn _2/3（Nb _0.85 Ta _0.15）_1/3）O ₃（BTBZNT）MLCC，并且内部电极和烧结方法对储能的影响研究了BTBZNT MLCC的特性。通过使用纯Pt代替Ag _0.6 Pd _0.4合金作为内部电极，交流击穿强度（BDS）从1047提高到1500 kV / cm。通过研究BTBZNT MLCC的漏电流行为，证实了Pt内电极和两步烧结法（TSS）可以增强肖特基势垒并最小化漏电流密度。具有相对高的介电常数，介电亚线性和超高BDS，Pt TSS BTBZNT MLCC的放电能量密度（U _dis）令人惊讶地为14.08 J / cm ³。此外，在400 kV / cm的工作电场下，MLCC还表现出热稳定性，在-50至175°C的宽温度（t）范围内，U _dis变化<±8％，并且在U _dis下循环可靠性3000次充放电循环后，还原率<0.3％。这些卓越的性能使Pt TSS BTBZNT MLCC有望用于储能应用。