Syntheses and Properties of Ta ⁵⁺ Doped Li₇La₃Zr₂O₁₂

Authors

Feng-feng PENG, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;
Shi-you LI, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;Follow
Tong-tong GENG, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;
Chun-lei LI, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;
Shuang-wei ZENG, College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China;

Corresponding Author

Shi-you LI(lishiyoulw@163.com)

Abstract

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.

Graphical Abstract

Keywords

Li7La3Zr2O12, Garnet-type, Ta 5+ doping, solid state reaction

DOI Link

https://doi.org/10.13208/j.electrochem.181105

Publication Date

2020-04-28

Online Available Date

2019-02-21

Revised Date

2019-02-16

Received Date

2018-11-05

Recommended Citation

Feng-feng PENG, Shi-you LI, Tong-tong GENG, Chun-lei LI, Shuang-wei ZENG. Syntheses and Properties of Ta ⁵⁺ Doped Li₇La₃Zr₂O₁₂[J]. Journal of Electrochemistry, 2020 , 26(2): 308-314.
DOI: 10.13208/j.electrochem.181105
Available at: https://jelectrochem.xmu.edu.cn/journal/vol26/iss2/16

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