锆盐原料不同对LiZr2(PO4)3锂离子固体电解质结构及性能的影响

The Influence of Zirconium Salt Materials on the Structure and Properties of LiZr2(PO4)3 Lithium ion Solid Electrolyte

摘要:

以不同的锆盐为原料,采用固相法及液相法制备LiZr₂(PO₄)₃锂离子固体电解质,通过无压烧结的方式制备得到固体电解质片,并通过x射线衍射(XRD),扫描电子显微镜(SEM),电化学交流阻抗(EIS)对LiZr₂(PO₄)₃锂离子固态电解质进行表征,通过测试结果对比分析,研究锆盐原料的不同对LiZr₂(PO₄)₃锂离子固态电解质结构及性能的影响。结果表明：当以醋酸锆为锆盐原料时,合成的LiZr₂(PO₄)₃以高电导率的菱方相于常温下稳定存在,而其他三种锆盐作原料时合成的LiZr₂(PO₄)₃常温下以三斜相存在。制备的菱方相LiZr₂(PO₄)₃电解质样品片室温锂离子总电导率最大,为2.25×10_-5S/cm,且激活能值最小,为0.28eV。

关键词:LiZr₂(PO₄)₃;锂离子固体电解质;锂离子电导率;锂离子二次电池

Abstract:

Samples of LiZr₂(PO₄)₃ compound with pure phase , adopting the method of solid phase and liquid phase method, were obtained by pressureless sintering from different zirconium salt raw materials. And LiZr₂(PO₄)₃Li-ion solid electrolytes were characterized through x-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical impedance (EIS) . Analyzing the results of the test, the influence of different zirconium salt raw materials on the structure and performance of LiZr₂(PO₄)₃ solid electrolytes is studied. A room-temperature stable α- LiZr₂(PO₄)₃phase(R-3c,a=8.8442?andc=22.264?) is prepared from zirconium acetate. While synthetic LiZr₂(PO₄)₃ prepared from the other three kinds of zirconium salt raw materials exist in triclinic phase . Rhombohedral phase LiZr₂(PO₄)₃ lithium ion solid state electrolyte sample prepared from different zirconium raw materials show the highest total conductivity of 2.25 × 10_-5 S/cm, and the activation energy is 0.28 eV.

Key words:LiZr₂(PO₄)₃; Li-ion solid electrolyte; ionic conductivity;Li-ion secondary battery