钛酸铋钠基无铅弛豫铁电陶瓷的能量存储性能及稳定性  

Energy Storage Performance and Stability of Sodium Bismuth Titanate-Based Lead-Free Relaxor Ferroelectric Ceramics

作　　者：顾陇 李子昕 周文杰 闫非 GU Long;LI Zixin;ZHOU Wenjie;YAN Fei(School of Advanced Materials and Nanotechnology,Xidian University,Xi'an 710126,China)

机构地区：[1]西安电子科技大学先进材料与纳米科技学院,西安710126

出　　处：《硅酸盐学报》2024年第4期1257-1266,共10页Journal of The Chinese Ceramic Society

基　　金：陕西数理基础科学研究项目(22JSQ042)。

摘　　要：近年来,陶瓷电介质电容器因其功率密度高、充放电速度快、循环寿命长、稳定性好等特点而在脉冲功率系统中得到广泛关注。然而环境友好型无铅储能陶瓷的能量密度和能量转换效率普遍偏低,严重制约了实际应用的需求。基于此,采用固相反应法制备了化学组成为(1–x)(0.94Bi_(0.55)Na_(0.45)TiO_(3)-0.06BaTiO_(3))-xSr_(0.7)Bi_(0.2)TiO_(3)[简记为(1–x)BNBT-xSBT,其中x=0,0.10,0.20,0.30,0.40]的无铅陶瓷,系统地研究了不同SBT含量对(1–x)BNBT-xSBT陶瓷相结构、微观形貌、介电性能和能量存储性能的影响。通过增加(1–x)BNBT-xSBT陶瓷的SBT含量,其介电弛豫峰逐渐向低温方向移动,并且介电常数的温度稳定性也得到了显著提升,在25.0~343.9℃温度范围内的变化量小于±10%。同时,(1–x)BNBT-xSBT陶瓷呈现出类反铁电体的电滞回线特征,其电滞回线的滞后现象随SBT含量增加而减小。当x=0.30时,陶瓷样品表现出细长的电滞回线形状,在192 kV/cm较低电场强度下,有效储能密度可以达到2.16 J/cm^(3),相应的储能效率约为90%,并且表现出优异的频率稳定性和循环稳定性。Introduction With the increasingly severe environmental pollution and global warming,developing green and sustainable energy storage devices with high power density,energy storage density,and good stability becomes a research hotspot.Compared with batteries and electrochemical capacitors,lead-free ceramic dielectric capacitors exhibit eco-friendly,high power density,fast charge/discharge speed and excellent reliability,which are promising candidates for advanced pulse power systems.In general,the energy storage density of ceramic dielectric capacitors can be evaluated via measuring the polarization versus electric field hysteresis loops(i.e.,P–E loops).Large maximum polarization(P_(max)),small remnant polarization(P_r)and high breakdown strength(Eb)are critical parameters to achieve a high recoverable energy storage density(W_(rec))and an energy storage efficiency(η).Although some previous work reported a higher energy storage density at higher electric field(>200 kV/cm),the high electric field could restrict the application in some fields.It is thus crucial to develop ceramic dielectric capacitors with a superior energy storage performance at a lower electric field(<200 kV/cm).In this paper,we designed and prepared a series of(1–x)(0.94Bi_(0.55)Na_(0.45)TiO_(3)-0.06BaTiO_(3))-xSr_(0.7)Bi_(0.2)TiO_(3)(x=0,0.10,0.20,0.30,0.40)lead-free relaxor ferroelectric ceramics to achieve a high energy storage performance and a superior stability at a low electric filed.In addition,the energy storage properties were also investigated.Methods TiO_(2)(98%),SrCO_(3)(99%),Bi_(2)O_(3)(99%),Na_(2)CO_(3)(99.8%)and BaCO_(3)(99%)were used as raw materials for the synthesis of(1–x)BNBT-xSBT lead-free ceramics.According to the stoichiometric ratio,these raw materials were weighed.The materials were mixed with alcohol and ground in nylon jars for 12 h.After drying,the powders were calcined at 950℃for 4 h.Subsequently,the calcined powders with alcohol were further ground in nylon jars for 12 h.Afterwards,the obtained powders were

关 键 词：钛酸铋钠 无铅陶瓷 能量存储 稳定性 介电性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]