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摘要：本文利用高温固相法制备石榴石型Li7-x+yLa3Zr2-x-yTaxAlyO12电解质，并分别研究了锂的配比、铝的配比、钽的配比、第一次烧结温度、第二次烧结时间以及第二次烧结温度对制备的Li7-x+yLa3Zr2-x-yTaxAlyO12电解质的电导率的影响，Li7-x+yLa3Zr2-x-yTaxAlyO12电解质的制备的较佳工艺条件：钽的配比为0.5，铝的配比为0.1，锂过量10%，第一次烧结温度为900℃、第一次烧结时间为6小时、第二次烧结温度为1140℃、第二次烧结时间为20小时的时候，用电化学阻抗谱测电解质Li6.6La3Zr1.4Ta0.5Al0.1O12的电导率为9.43x10-4 S/cm。并用电子扫描电镜（SEM）以及X射线衍射仪（XRD）分别对Li7-x+yLa3Zr2-x-yTaxAlyO12电解质的形貌和结构进行表征， Li6.6La3Zr1.4Ta0.5Al0.1O12电解质微粒间隙小且分布均匀，还是立方晶相；30842
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创新点：用混合锂盐LiNO3和Li2CO3制备Li7-x+yLa3Zr2-x-yTaxAlyO12电解质还未见报道，且结果比结构相似的Li6.15La3Zr1.75Ta0.25Al0.2O12高2倍。
毕业论文关键词： 高温固相法；氧化铝；五氧化二钽；电导率
The Preparation of the Al and Ta doped Li7La3Zr2O12 Electrolyte
Abstract: In this article, a garnet-type Li7La3Zr2O12 electrolyte was prepared using high-temperature solid-phase method by Al and Ta doping. The effects of molar ratios of Li, Al, Ta , as well as the second sintering time, and the first and the second sintering temperature on the conductivity of the resultant sample of Li7-x+yLa3Zr2-x-yTaxAlyO12 electrolyte was investigated. From these results, the optimized technical conditions for the preparation of the electrolyte turned out to be the following: The ratio of Ta and Al is 0.5 and 0.1, respectively, with the first sintering temperature/time, and the second sintering temperature/time being 900ºC/6h, and 1140ºC/20h, respectively, along with a 10% excess of lithium. The conductivity of the resultant product, Li6.6La3Zr1.4Ta0.5Al0.1O12,was determined to be 9.4310-4 S/cm. Scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) were used to characterize the morphology and structure of the electrolyte, respectively, indicating the sample of Li6.6La3Zr1.4Ta0.5Al0.1O12 electrolyte is comprised of uniformly sized particles with a small interstitial space in its cubic lattice phase.
The Innovative points of this study are: Using both LiNO3 and Li2CO3 as lithium source to prepare Li7La3Zr2O12 electrolyte has not been reported, and the the conductivity of the prepared electrolyte was found to be 2 times higher than that of a similar structure . Li6.15La3Zr1.75Ta0.25Al0.2O12.
Key Words:high-temperature solid-phase method；aluminum oxide ;tantalic oxide;conductivity
目录
1 前言 1
1.1 锂离子电池简介及电池的发展 1
1.1.1 锂离子电池的工作原理 1
1.1.2 锂离子电池的优点[5] 1
1.1.3 电池的发展及发展方向 2
1.2 固体电解质种类及研究现状 2
1.2.1 聚合物电解质 2
1.2.2 LiPON电解质 3
1.2.3 NASICON类型电解质 3
1.2.4 钙钛矿型电解质 3
1.2.5 硫化物电解质 3
1.2.6 石榴石晶体类电解质 4
1.3 论文研究方法-高温固相合成法 4
1.3.1 高温固相法简介 4
1.3.2 助磨剂 5
1.4 论文研究内容和意义 5
1.4.1 论文研究的内容 5
1.4.2 论文研究的意义 5
2 实验部分 7
2.1 仪器与试剂 7
2.1.1 实验仪器 7
2.1.2 实验试剂 7
2.2 铝钽掺杂锆酸镧电解质的制备 8
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