摘要：本文采用固相法制备Al3+、Ba2+、W6+共掺杂Li7La3Zr2O12固体电解质，研究氧化锂含量、锂盐种类、埋粉含量分别对制备产物的离子电导率、晶体结构、微观形貌、相对致密度和收缩率等性能的影响。研究结果为：（1）氧化锂含量过量范围在0%~30%，当氧化锂含量过量20%时，制备的产物的离子电导率最高，为6.35×10-4Scm-1；制备的产物为纯的立方相石榴石结构，晶体结构致密，基本上观察不出晶界；相对致密度和收缩率最高，分别为96.32%和17.1%。（2）锂盐分别为Li2CO3、LiNO3、LiOH、Li2C2O4时，用Li2CO3作为锂盐制备的产物离子电导率最高，为6.35×10-4Scm-1，且为方相石榴石结构的固体电解质，基本上观察不出晶界；相对致密度和收缩率最高，分别为96.32%和17.11%。（3）埋粉含量为0g，1g，2g，4g，8g时，用2g埋粉制备的产物的离子电导率最大，为6.35×10-4Scm-1；基本上观察不出晶界的存在；此时具有较高的相对致密度和收缩率，分别为96.32%和17.11%57451

毕业论文关键词：锂离子电池；固体电解质；石榴石；离子电导率

The Effect of different Preparation Conditions for property of Al3+, Ba2+, W6+ co-doped solid electrolyte Li7La3Zr2O12

Abstrat:In this paper, we preparated Al3+, Ba2+, W6+ co-doped solid electrolyte Li7La3Zr2O12 under the different preparation conditions. And we studied the effect of lithium oxide, lithium salt type and powder beds on ionic conductivity, crystal structure,morphology structure, relative density and contractibility rate. The results research as follows: (1) The content of lithium oxide excess of 0% to 30%, the results of research showed that when the content of lithium oxide excess of 20%, the ionic conductivity was the highest, 6.35×10-4Scm-1,and synthesized samples showed pure cubic garnet structure which was dense.Substantially no grain boundary was observed.The highest of relative density and contractibility rate was respectively 96.32% and 17.1%.(2)The lithium salt was Li2CO3, LiNO3, LiOH, Li2C2O4,when we used Li2CO3 to prepare the product, it has the hightest ionic conductivity, which was 6.35×10-4Scm-1.And we can successfully synthesised cubic garnet structure solid electrolyte. It has better morphology, with Li2CO3 as lithium salts we can get higher relative density and contractibility rate, which respectively was 96.32% and 17.11%.(3) The content of powder beds were 0g, 1g, 2g, 4g, 8g, the ionic conductivity had a maximum Numerical for 6.35×10-4Scm-1when the content of powder beds was 2g.And the highest relative density and contractibility rate was respectively 96.32% and 17.11%.

KeyWords:  Lithium-ion battery; solid electrolyte; garnet; ionic conductivity

目录

1 绪论 1

1.1  引言 1

1.2  锂离子电池 1

1.2.1  锂离子电池的工作原理 2

1.2.2  下一代锂离子电池 2

1.3  锂离子电池电解质 3

1.4  无机固体电解质 3

1.4.1  无机电解质的导电理论 4

1.4.2常见的无机固体电解质 4

1.5  论文的研究内容 6

1.5.1  研究内容 6

2  实验内容与表征方法 7

2.1  原料、试剂以及仪器 7

2.2  制备Al3+、Ba2+、W6+共掺杂Li7La3Zr2O12固体电解质的工艺流程