固体电解质La(1.7)Sm_(0.3)Mo_(2-x)Nb_(x)O_(9-δ)的制备及离子电导性能研究  

Study on the preparation and ionic conductivity of solid electrolyte La(1.7)Sm_(0.3)Mo_(2-x)Nb_(x)O_(9-δ)

作　　者：阳杰 司小强 陈静怡 李东 唐静 张霞 YANG Jie;SI Xiao-qiang;CHEN Jing-yi;LI Dong;TANG Jing;ZHANG Xia(College of Energy Materials and Chemical Engineering,Hefei University,Hefei 230601,Anhui,China)

机构地区：[1]合肥大学能源材料与化工学院,安徽合肥230601

出　　处：《云南大学学报（自然科学版）》2024年第1期120-126,共7页Journal of Yunnan University(Natural Sciences Edition)

基　　金：安徽省高校省级优秀青年人才基金(gxyq2022072);省级质量工程示范化学实验实训中心项目(2022sysx024);合肥学院本科质量工程项目(化学实验教学团队2022hfujxtd04)。

摘　　要：以氧化镧、氧化钐和氧化钼为原料,采用固相法制备Sm、Nb共掺杂La(1.7)Sm_(0.3)Mo_(2-x)Nb_(x)O_(9-δ)(LSMN,x=0.1~0.6)固体电解质.采用X射线衍射(XRD)、扫描电子显微镜(SEM)、傅立叶变换红外(FT-IR)和电化学阻抗谱对LSMN的微观晶体结构和离子电导率进行表征.研究结果表明,LSMN的晶粒大小在51.6~199.3nm之间.经过700℃煅烧8 h可以成功制备出具有立方结构的超细粉末,粉体具有较高的烧结活性.经过1100℃烧结10 h获得烧结体晶粒结合紧密,晶界清晰,相对密度均在96%以上.电性能分析表明,Nd^(3+)离子的掺杂能够显著提高LSMN的离子电导率;La_(1.7)Sm_(0.3)Mo_(1.6)Nb_(0.4)O_(8.8)经1100℃烧结10 h得到固体电解质,在800℃时离子电导率最大达到3.05×10^(-2)S·cm^(-1),其活化能达1.703 eV.Sm,Nb co-doped La(1.7)Sm_(0.3)Mo_(2-x)Nb_(x)O_(9-δ)(LSMN,x=0.1~0.6)were prepared by solid state method using lanthanum oxide,samarium oxide and molybdenum oxide as raw materials solid electrolyte.The crystal structure and ionic conductivity of LSMN were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared(FT-IR)and electrochemical impedance spectroscopy.The results show that the grain size of LSMN is between 51.6 nm and 199.3 nm.After calcining at 700℃for 8 h,the ultrafine powder with cubic structure can be successfully prepared,and the powder has high sintering activity.After sintering at 1100℃for 10 h,the grains of the sintered body are tightly bound,the grain boundaries are clear,and the relative density is above 96%.The electrical performance analysis shows that the doping of Nd^(3+)ions can significantly improve the ion conductivity of LSMN;La_(1.7)Sm_(0.3)Mo_(1.6)Nb_(0.4)O_(8.8) is sintered at 1100℃for 10 h to obtain solid electrolyte,and the maximum ionic conductivity is 3.05×10^(−2)S·cm^(−1)at 800℃,its activation energy reaches 1.703 eV.

关 键 词：氧离子导体 固相法 双掺杂 离子电导率 固体电解质 

分 类 号：TB34[一般工业技术—材料科学与工程] Q646[生物学—生物物理学]