Ta 5+掺杂Li7La3Zr2O12的合成及其性能研究
收稿日期: 2018-11-05
修回日期: 2019-02-16
网络出版日期: 2019-02-21
基金资助
国家自然科学基金项目(21766017);白银项目(2017-2-11G);中科院“西部之光”-西部青年学者项目
Syntheses and Properties of Ta 5+ Doped Li7La3Zr2O12
Received date: 2018-11-05
Revised date: 2019-02-16
Online published: 2019-02-21
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.
关键词： Li7La3Zr2O12; 石榴石型; Ta 5+掺杂; 固相法
彭峰峰 , 李世友 , 耿彤彤 , 李春雷 , 曾双威 . Ta 5+掺杂Li7La3Zr2O12的合成及其性能研究[J]. 电化学, 2020 , 26(2) : 308 -314 . DOI: 10.13208/j.electrochem.181105
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.
Key words： Li7La3Zr2O12; Garnet-type; Ta 5+ doping; solid state reaction
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