廖瑞雄, 李子蔚, 雷金刚, 刘泽远, 王海忠, 赖福林, 王伯元, 张骞. LiF掺杂提升Li1.1Ta0.9Zr0.1SiO5固态电解质室温离子电导率[J]. 有色金属科学与工程, 2022, 13(6): 58-66. DOI: 10.13264/j.cnki.ysjskx.2022.06.008
引用本文: 廖瑞雄, 李子蔚, 雷金刚, 刘泽远, 王海忠, 赖福林, 王伯元, 张骞. LiF掺杂提升Li1.1Ta0.9Zr0.1SiO5固态电解质室温离子电导率[J]. 有色金属科学与工程, 2022, 13(6): 58-66. DOI: 10.13264/j.cnki.ysjskx.2022.06.008
LIAO Ruixiong, LI Ziwei, LEI Jingang, LIU Zeyuan, WANG Haizhong, LAI Fulin, WANG Boyuan, ZHANG Qian. LiF doping improving the ionic conductivity of the Li1.1Ta0.9Zr0.1SiO5 solid electrolyte at room temperature[J]. Nonferrous Metals Science and Engineering, 2022, 13(6): 58-66. DOI: 10.13264/j.cnki.ysjskx.2022.06.008
Citation: LIAO Ruixiong, LI Ziwei, LEI Jingang, LIU Zeyuan, WANG Haizhong, LAI Fulin, WANG Boyuan, ZHANG Qian. LiF doping improving the ionic conductivity of the Li1.1Ta0.9Zr0.1SiO5 solid electrolyte at room temperature[J]. Nonferrous Metals Science and Engineering, 2022, 13(6): 58-66. DOI: 10.13264/j.cnki.ysjskx.2022.06.008

LiF掺杂提升Li1.1Ta0.9Zr0.1SiO5固态电解质室温离子电导率

LiF doping improving the ionic conductivity of the Li1.1Ta0.9Zr0.1SiO5 solid electrolyte at room temperature

  • 摘要: LiTaSiO5(LTSO)是一种新型的快离子导体,但现今合成的该电解质样品室温离子电导率较低。采用固相合成法制备了Li1.1Ta0.9Zr0.1SiO5固态电解质, 研究LiF掺杂对Li1.1Ta0.9Zr0.1SiO5电解质材料结构和性能的影响。结果表明,LiF掺杂能改善晶体的结晶性能,促进晶体的生长和降低晶界的数量,并显著降低孔隙率,提高电解质样品的致密度,从而降低电解质样品的晶粒和晶界电阻,有利于锂离子在晶粒和晶界之中快速迁移,提高材料的整体离子电导率。当LiF加入量为0.4%(质量百分比)时,Li1.1Ta0.9Zr0.1SiO5电解质的相对密度达90.81%,总离子电导率为8.31×10-5 S/cm,扩散激活能为0.203 eV,比未掺杂样品的离子电导率高近2倍。

     

    Abstract: LiTaSiO5 (LTSO) is a new type of fast ionic conductor. However, current synthesized electrolytic samples have lower ionic conductivity at room temperature. The Li1.1Ta0.9Zr0.1SiO5 solid electrolyte was prepared by the solid-phase synthesis method, and the effect of LiF doping on the structure and performance of such electrolyte material was studied in this paper. The results showed that LiF doping improved the crystallinity of crystals, promoted crystal growth, and then reduced the number of grain boundaries, which significantly reduced the porosity and increased the density of electrolyte samples. As a result, it could reduce the crystal particle and grain boundary resistance of electrolyte samples, facilitate the rapid migration of lithium ions among crystal particles and grain boundaries, and improve the overall ionic conductivity of the material. When x=0.4, its relative density reached 90.81%, the total ionic conductivity was 8.31×10-5 S/cm, and the diffusion activation energy reached 0.203 eV, which was nearly two times higher than that of the undoped samples.

     

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