Ta 5+掺杂Li7La3Zr2O12的合成及其性能研究 |
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引用本文: | 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. |
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作者姓名: | 彭峰峰 李世友 耿彤彤 李春雷 曾双威 |
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作者单位: | 兰州理工大学石油化工学院,甘肃 兰州 730050 |
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基金项目: | 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 |
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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.
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关 键 词: | Li7La3Zr2O12 石榴石型 Ta 5+掺杂 固相法 |
收稿时间: | 2018-11-05 |
Syntheses and Properties of Ta 5+ Doped Li7La3Zr2O12 |
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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. |
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Keywords: | Li7La3Zr2O12 Garnet-type Ta 5+ doping solid state reaction |
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