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Effects of dielectric thickness on energy storage properties of 0.87BaTiO3-0.13Bi(Zn2/3(Nb0.85Ta0.15)1/3)O3 multilayer ceramic capacitors
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2020-01-16 , DOI: 10.1016/j.jeurceramsoc.2020.01.032
Hongxian Wang , Peiyao Zhao , Lingling Chen , Xiaohui Wang

Multilayer Ceramic Capacitors (MLCCs) for energy storage applications require a large discharge energy density and high discharge/charge efficiency. Here, 0.87BaTiO3-0.13Bi(Zn2/3(Nb0.85Ta0.15)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 asBDSD0.368, 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.



中文翻译:

介电厚度对0.87BaTiO 3 -0.13Bi(Zn 2/3(Nb 0.85 Ta 0.151/3)O 3多层陶瓷电容器储能性能的影响

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 0.151/3)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。BDSD之间的强相关性,描述为d小号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。

更新日期:2020-01-16
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