摘要：本文采用高温固相法制备了钇钨掺杂锆酸镧固体电解质，分别研究了锂盐含量、保温时间对钇钨掺杂锆酸镧固体电解质的电导率、相对致密度和收缩率的影响，选用X射线衍射法、交流阻抗法、扫描电镜法对所制备的电解质进行了表征。结果表明：当锂盐含量过量20wt%时，制备出电解质的离子电导率的为4.91×10-4Scm-1，相对致密度为94.41%，收缩率为10.21%。保温时间为12h时，制备出的电解质离子电导率为6.09×10-4Scm-1，相对致密度为95.62%，收缩率为11.38%。锂盐含量过量20wt%时及保温时间为12h时，制备的电解质晶体结构都为立方相石榴石结构固体电解质；断截面表面晶界数量相对较少，孔隙较小，有少量的闭气空出现在表面。本文创新点：钇钨掺杂锆酸镧固体电解质的研究均未见报道。71241

毕业论文关键词：高温固相法；交流阻抗；电导率

Characterization of yttrium tungsten doped lanthanum zirconate electrolytes 

Abstract：In this paper，yttrium tungsten doped lanthanum tungstate solid electrolyte is prepared by high temperature solid phase method. The effects of lithium salt content and holding time on the conductivity, relative density and shrinkage of lanthanum tungsten lanthanum lanthanum solid electrolyte are studied. The electrolyte is characterized by X-ray diffraction, electrochemical impedance spectroscopy and scanning electron microscopy. Research results show that: When the content of lithium salt is over 20wt%, the ionic conductivity is 4.91×10-4Scm-1, the relative density is 94.41% and the shrinkage rate is 10.21%. When the holding time is 12h, the ionic conductivity is 6.09×10-4Scm-1, the relative density is 95.62% and the shrinkage rate is 11.38%. When the content of lithium salt is over 20wt% and the holding time is 12h, the prepared electrolyte crystal structures are cubic phase garnet solid electrolyte. The number of grain boundaries on the cross-section surface is relatively small, the pores are small, and a small amount of closed air appears on the surface. Innovation point: yttrium tungsten co-doped lanthanum zirconate solid electrolyte research have not been reported.

Key words: high temperature solid phase method; AC impedance; electrical conductivity 

目录

1 绪论 1

1.1 引言 1

1.2 锂离子电池 2

1.3 锂离子电池电解质 4

1.3.1 有机液体电解质 5

1.3.2 聚合物电解质 5

1.3.3 常见的无机固体电解质 6

1.4论文的研究内容 9

1.4.1 课题来源 9

1.4.2 论文研究内容 9

2 实验部分 10

2.1试剂、原料以及仪器 10

2.2 工艺流程 11

2.3 钇钨掺杂锆酸镧固体电解质的制备 12

2.3.1锂盐含量的选择： 12

2.3.2保温时间的选择： 12

2.4 表征方法 12

2.4.1 X射线衍射法（XRD） 12

2.4.2 交流阻抗法（EIS） 13

2.4.3 扫描电子显微镜法（SEM） 14

3 结果与讨论 15