摘要：本文采用高温固相法制备Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx（x：0.05~0.25）和Li6.66La3Zr1.54Sb0.4Y0.06O12Alx（x：0.05~0.25）固体电解质，研究Al含量对Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx和Li6.66La3Zr1.54Sb0.4Y0.06O12Alx固体电解质的电导率、晶体结构、微观形貌、致密度和收缩率等性能的影响。采用EIS，SEM，XRD方法对电解质样片进行结构和性能表征。研究结果如下：（1）Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx（x：0.05~0.25）固体电解质在Al含量为0.20mol时，电解质的电导率、收缩率、相对致密度值最大，分别为5.21×10-4 S·cm-1、10.72%、92.61%；该固体电解质SEM结果表明，其晶粒最大，晶界少；XRD结果表明，该固体电解质为立方相结构。（2）Li6.66La3Zr1.54Sb0.4Y0.06O12Alx（x：0.05~0.25）固体电解质在Al含量为0.15mol时，电解质的电导率、收缩率、相对致密度最大，分别为4.75×10-4 S·cm-1、9.14%、91.21%；该固体电解质SEM结果表明，其晶界空隙小，接触最为紧密；XRD结果表明，该固体电解质为立方相结构。

关键词：固体电解质；掺杂；锆酸镧；电导率

The effect of Al on the properties of Sb doped Li7La3Zr2O12Solid- state Electrolyte

Abstract: In this paper, Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx（x：0.05~0.25）and Li6.66La3Zr1.54Sb0.4Y0.06O12Alx（x：0.05~0.25）were synthesized by high temperature solid phase method. The effects of Al on the conductivity, crystal structure, micro structure and shrinkage of Li6.62La2.98Sr0.02Zr1.6Sb0.4O12 Alx and Li6.66La3Zr1.54Sb0.4Y0.06O12Alx were studied. The structure and properties of the electrolyte samples were characterized by EIS, SEM, XRD and other instruments. The results are as follows:（1）The electrolyte conductivity of Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx（x：0.05~0.25） solid electrolyte is maximum when the Al content is 0.20 mol. The result is 5.21×10-4 S.cm-1, the shrinkage rate was 10.72% and the relative density was 92.61%. From the SEM image, the solid electrolyte has a small grain boundary porosity, highest density, and uniform grain size distribution. The SEM diagram of the solid electrolyte shows that the grain size is the largest and the grain boundaries are few.XRD results show that the sample prepared under this content is cubic phase structure.（2）The electrolyte conductivity of Li6.66La3Zr1.54Sb0.4Y0.06O12（x：0.05~0.25） solid electrolyte is maximum when the Al content is 0.20mol. The result is 4.75×10-4 S.cm-1 the shrinkage rate was 9.14% and the relative density was 91.21%.  According to its SEM, the electrolyte has a small grain boundary porosity, highest density, and uniform grain size distribution.The SEM diagram of the solid electrolyte shows that the grain boundary is small, the gap is small, and the contact is the closest. XRD results show that the sample prepared under this content is cubic phase structure.

Key Words: electrolyte; doped stone; Li7La3Zr2O12; conductivity

目录

1. 绪论 1

1.1 锂电子电池 1

1.1.1 锂电子电池组成 1

1.1.2 锂电子电池工作原理 1

1.2 锂电子电池电解质研究现状 2

1.2.1 钙钛矿型锂离子固体电解质 3

1.2.2 NASICON型固体电解质 4

1.2.3 LISICON型固体电解质 5

1.2.4 硫化物固体电解质 6

1.2.5 氧化物玻璃态固体电解质 6

1.2.6 石榴石结构固体电解质 7

1.3 研究内容 10

2 实验部分 11

2.1 原料、试剂及仪器 11

2.2 制备工艺流程 12

2.3 Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx与Li6.66La3Zr1.54Sb0.4Y0.06O12Alx固体电解质的制备 13

2.3.1 Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx固体电解质的制备 13

2.3.2 Li6.66La3Zr1.54Sb0.4Y0.06O12Alx固体电解质的制备 13

2.4 产物表征 13

2.4.1 扫描电子显微镜（SEM） 13

2.4.2 交流阻抗（EIS） 14

2.4.3 X射线衍射（XRD） 15

3 结果与讨论 16

3.1 Al含量对Li6.62La2.98Sr0.02Zr1.6Sb0.4O12Alx固体电解质性能的影响 16