Syntheses and Properties of Ta 5+ Doped Li7La3Zr2O12
- 2020年第26卷 
本文采用固相法制备了Ta 5+掺杂的石榴石型无机固体电解质Li7-xLa3Zr2-xO12（xTa-LLZO）,研究了不同的掺杂量对材料性能的影响. 通过X射线发射光谱（XRD）、冷场发射电子扫描电镜（FESEM）和电化学阻抗（EIS）对材料进行物理表征和阻抗测试,并且组装LiFePO4//LLZTO//Li全固态锂电池测试电池的循环稳定性. 结果表明,随着Ta 5+掺杂的增加,材料呈现出一个单一的立方相结构,当Ta 5+掺杂量为14.09wt.%（即x=0.3）时,材料的室温离子电导率达到最大（2.58×10 -4 S·cm -1）,呈现出稳定的立方相结构且具有相对较高的致密度（89.16%）,并具有较稳定的循环稳定性,经过50个循环后容量保持率依然保持到88.67%左右.The tantalum ion (Ta 5+) doped garnet-type inorganic solid electrolyte Ta-LLZO was prepared by solid state reaction, and the effect of doping amount on the properties of the materials was investigated. The materials were characterized by X-ray diffraction (XRD), field emission electron scanning microscopy (FESEM) and electrochemical impedance spectroscopy (EIS). And the cycle stability was tested by assembly of LiFePO4//LLZTO//Li all solid lithium battery. The results show that with the increase of Ta 5+ doping amount, the material appeared to form a single cubic phase structure. When the Ta 5+ doping content became 14.09wt.%, x=0.3, the room temperature ionic conductivity of the material reached the maximum (2.58×10 -4 S·cm -1), forming a stable cubic phase structure with a relatively high density (89.16%). In addition, the relatively stable cycle stability was obtained and the capacity retention rate remained at around 88.67% after 50 cycles.