摘要
以不同的锆盐为原料,采用固相法及液相法制备LiZr_2(PO_4)_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LiZr_2(PO_4)_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LiZr_2(PO_4)_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LiZr_2(PO_4)_3以高电导率的菱方相于室温下稳定存在,而其他3种锆盐作原料时合成的LiZr_2(PO_4)_3室温下以三斜相存在。制备的菱方相LiZr_2(PO_4)_3电解质样品片室温锂离子总电导率最大,为2.25×10~(-5) S/cm,且激活能值最小,为0.28 eV。
Samples of LiZr_2(PO_4)_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 LiZr_2(PO_4)_3 Li-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 LiZr_2(PO_4)_3 solid electrolytes was studied. The results show that the room-temperature stable α-LiZr_2(PO_4)_3(rhombohedral phase) was prepared from zirconium acetate. While synthetic LiZr_2(PO_4)_3 prepared from the other three kinds of zirconium salt raw materials exists in triclinic phase. Rhombohedral phase LiZr_2(PO_4)_3 lithium ion solid state electrolyte sample prepared from different zirconium raw materials shows the highest total conductivity of 2.25×10~(-5) S/cm, and the lowest activation energy of 0.28 eV.
引文
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