Multilayer Ceramic Capacitors (MLCCs) for energy storage applications require a large discharge energy density and high discharge/charge efficiency. Here, 0.87BaTiO₃-0.13Bi(Zn_2/3(Nb_0.85Ta_0.15)_1/3)O₃ (BTBZNT) powders were synthesized via solid-state reactions, and MLCCs with sub-micron grains were fabricated using a two-step sintering method. The BTBZNT MLCCs, which are well-defined relaxor ferroelectrics, possessed relatively high permittivity, dielectric sublinearity, and negligible hysteresis. An AC breakdown strength (BDS) enhancement from 511 to 1047 kV/cm was obtained as the dielectric thickness (D) decreased from 26 to 5 μm. The strong correlation between BDS and D, described as$BDS\propto D^{-0.368}$, agreed well with the general macroscopic theory of thermal breakdown in insulators. The enhanced BDS afforded the BTBZNT MLCCs (D∼9 μm) with excellent energy storage properties with a maximum discharge energy density of 10.5 J/cm³ and discharge/charge efficiency of 93.7% under a maximum electric field of 1000 kV/cm. The MLCCs also exhibited excellent thermal stability with discharge energy density variation <±5% over a wide temperature range of −50 to 175 °C under an electric field of 400 kV/cm. These remarkable performances make BTBZNT MLCCs promising for energy storage applications.

用于储能应用的多层陶瓷电容器（MLCC）需要大的放电能量密度和高的放电/充电效率。在这里，通过固相反应合成了0.87BaTiO ₃ -0.13Bi（Zn _2/3（Nb _0.85 Ta _0.15）_1/3）O ₃（BTBZNT）粉末，并使用两步法制备了亚微米级的MLCC。分步烧结法。BTBZNT MLCC是定义明确的弛豫铁电体，具有相对较高的介电常数，介电亚线性和可忽略的磁滞。获得的交流击穿强度（BDS）从511提高到1047 kV / cm作为介电层厚度（D）从26微米降低到5微米。BDS与D之间的强相关性，描述为$乙d\mathrm{小号}\propto d^{-0.368}$，与绝缘子热击穿的一般宏观理论非常吻合。增强BDS得到BTBZNT的MLCC（d 10.5焦耳/平方厘米的最大放电能量密度〜9μm），以良好的能量储存性能³的1000千伏/厘米的最大电场下和放电/ 93.7％的充电效率。MLCC还表现出出色的热稳定性，在400 kV / cm的电场下，在−50至175°C的宽温度范围内，放电能量密度变化<±5％。这些出色的性能使BTBZNT MLCC有望用于储能应用。