Ta 5+掺杂Li7La3Zr2O12的合成及其性能研究

doi:10.13208/j.electrochem.181105

摘要/Abstract

摘要：

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Li_7-_xLa₃Zr_2-_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

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.

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

中图分类号:

O646
TM912.9

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（中英文）, 2020, 26(2): 308-314.

PENG Feng-feng, LI Shi-you, GENG Tong-tong, LI Chun-lei, ZENG Shuang-wei. Syntheses and Properties of Ta ⁵⁺ Doped Li₇La₃Zr₂O₁₂[J]. Journal of Electrochemistry, 2020, 26(2): 308-314.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.181105

https://electrochem.xmu.edu.cn/CN/Y2020/V26/I2/308

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Sample	Doping amount/x	Temperature, time	Relative density/%	Space group	Lattice constant/?	Conductivity/(S·cm^-1)
LLZO	0	1100 ^oC,12h	78.02	-	13.00	4.51×10^-7
	0.1	1100 ^oC,12h	81.82	-	12.85	1.74×10^-5
	0.2	1100 ^oC,12h	85.54	Ia-3d	12.85	1.63×10^-5
xTa-LLZO	0.25	1100 ^oC,12h	87.03	Ia-3d	12.88	5.32×10^-5
	0.3	1100 ^oC,12h	89.16	Ia-3d	12.90	2.58×10^-4
	0.4	1100 ^oC,12h	91.78	Ia-3d	12.85	9.39×10^-6

Ta ⁵⁺掺杂Li₇La₃Zr₂O₁₂的合成及其性能研究

Syntheses and Properties of Ta ⁵⁺ Doped Li₇La₃Zr₂O₁₂

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