烧结助剂ZnO对Li6.5La3Zr1.5Nb0.5O12固态电解质离子电导率及循环稳定性的影响

Effect of ZnO addition on ionic conductivity and cycle stability of Li6.5La3Zr1.5Nb0.5O12 solid electrolyte

刘大铭 ¹赵瑞超 ²侯渊²

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作者信息

1. 内蒙古科技大学材料与冶金学院,内蒙古包头 014010;内蒙古科技大学分析测试中心,内蒙古包头 014010
2. 内蒙古科技大学分析测试中心,内蒙古包头 014010
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摘要

采用固相合成法制备Li6.5La3Zr1.5Nb0.5O12(简称LLZNO)固态电解质,分析了质量分数为0.00％～2.00％的ZnO对LLZNO离子电导率和循环稳定性的影响.采用X射线衍射仪、扫描电子显微镜、电化学阻抗谱以及恒流充放电测试,探究了样品的晶体结构、断面形貌、离子电导率及其对锂循环稳定性.结果表明:随着样品中ZnO质量分数的增加,样品烧结气孔数量明显减少,断面形貌平整.当ZnO的质量分数为0.50％时,样品为立方相,室温离子电导率提升了14.63％;在80 h(40次)的恒流充放电循环中,电压保持稳定,具有良好的循环性能.

Abstract

Li6.5La3Zr1.5Nb0.5O12(LLZNO) solid-state electrolytes were prepared by traditional solid phase synthesis method. The effects of 0. 00％-2. 00％ mass fractions of ZnO on the ionic conductivity and cycling stability of LLZNO were analyzed. The crystal structure, cross-sectional morphology, ionic conductivity, and lithium cycle stability of the sample were investigated by X-ray diffrac-tion analysis, scanning electron microscope, electrochemical impedance spectroscopy, and constant current charge discharge testing. The results show that:The number of sintered pores in the samples is significantly decreased with the increase of the mass fraction of ZnO and the cross-sectional morphology becomes flat. When the mass fraction of ZnO is 0. 50％, the sample has cubic structure and its ionic conductivity at room temperature increases by 14. 63％. In addition, the voltage remains stable under the appearance of large overpotential during 80 h (40 cycles) of constant current cycling.

关键词

ZnO/离子电导率/固态电解质/Li6.5La3/Zr1.5Nb0.5O12

Key words

ZnO/ionic conductivity/solid state electrolyte/Li6.5La3Zr1.5Nb0.5O12

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基金项目

内蒙古自治区自然科学基金(2022FX08)

出版年

2024

内蒙古科技大学学报

内蒙古科技大学

内蒙古科技大学学报

影响因子：0.247

ISSN：2095-2295

参考文献量13

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