Li_(x)La_(0.57)TiO_(3)固体电解质的制备及其性能研究  

Study on preparation and performance of Li_(x)La_(0.57) TiO_(3) solid electrolyte

作　　者：韦晗丹 邵亮[1] 李蓓君 曹林 何选盟[2] 刘辉[2] WEI Han-dan;SHAO Liang;LI Bei-jun;CAO Lin;HE Xuan-meng;LIU Hui(College of Chemistry and Chemical Engineering,Shaanxi University of Science&Technology,Xi′an 710021,China;School of Material Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science&Technology,Xi′an 710021,China;Binzhou Chengxin Construction Co.,Ltd.,Binzhou 256800,China)

机构地区：[1]陕西科技大学化学与化工学院,陕西西安710021 [2]陕西科技大学材料科学与工程学院、陕西省无机材料绿色制备与功能化重点实验室,陕西西安710021 [3]滨州诚信建筑有限公司,山东滨州256800

出　　处：《陕西科技大学学报》2023年第2期134-140,共7页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(2210011473);陕西科技大学研究生创新基金项目。

摘　　要：采用固相法合成了Li_(x)La_(0.57)TiO_(3)(LLTO)固体电解质材料.利用XRD、SEM对电解质结构和相组成进行了表征,研究了不同烧结温度和锂含量变化对电解质离子电导率的影响,并研究了电解质的锂离子扩散活化能.结果表明:随着烧结温度的升高,固体电解质烧结越致密,主晶相为立方晶型,当烧结温度高于1 300℃,开始出现四方相LLTO,导致锂离子电导率下降;随着锂含量的增加,LLTO晶格发生畸变,锂离子电导率先增加后减小.最终,在锂含量为0.42,经1 300℃烧结的LLTO固体电解质具有最佳的离子电导率,其电导率达到1.30×10^(-3) S·cm^(-1),锂离子扩散活化能为0.26 eV.The Li_(x)La _(0.57) TiO_(3)(LLTO)solid electrolyte were synthesized by the solid-state method.The structure and phase composition of electrolyte were characterized by XRD and SEM.The effects of sintering temperature and of lithium content on the ionic conductivity of the LLTO electrolyte were investigated,and the lithium ionic diffusion activation energy was furtherly calculated.The results showed that the sintering density of LLTO electrolyte increased with elevating the sintering temperature,and the main crystalline phase of electrolyte were cubic crystalline.When the sintering temperature was above 1300℃,the tetragonal phase LLTO began to appear in LLTO electrolyte,resulting in the decrease of lithium ionic conductivity.As lithium content of LLTO increasing,the crystalline lattice was distorted,leading to the lithium ionic conductivity firstly increased and then decreased.Finally,the LLTO solid electrolyte sintered at 1300℃with a lithium content of 0.42 exhibited the best lithium ionic conductivity,which reaches up to 1.30×10^(-3) S·cm^(-1),and the lithium ionic diffusion activation energy was 0.26 eV.

关 键 词：Li_(x)La_(0.57)TiO_(3) 离子导电率 烧结温度 锂含量 

分 类 号：TB321[一般工业技术—材料科学与工程]