材料科学
四方晶系
电导率
兴奋剂
离子电导率
快离子导体
八面体
锂(药物)
镓
离子
相(物质)
电解质
无机化学
分析化学(期刊)
结晶学
晶体结构
物理化学
化学
电极
有机化学
冶金
内分泌学
医学
光电子学
色谱法
作者
Jian‐Fang Wu,Enyi Chen,Yao Yu,Lin Liu,Yue Wu,Wei Kong Pang,Vanessa K. Peterson,Xin Guo
标识
DOI:10.1021/acsami.6b13902
摘要
Owing to their high conductivity, crystalline Li7-3xGaxLa3Zr2O12 garnets are promising electrolytes for all-solid-state lithium-ion batteries. Herein, the influence of Ga doping on the phase, lithium-ion distribution, and conductivity of Li7-3xGaxLa3Zr2O12 garnets is investigated, with the determined concentration and mobility of lithium ions shedding light on the origin of the high conductivity of Li7-3xGaxLa3Zr2O12. When the Ga concentration exceeds 0.20 Ga per formula unit, the garnet-type material is found to assume a cubic structure, but lower Ga concentrations result in the coexistence of cubic and tetragonal phases. Most lithium within Li7-3xGaxLa3Zr2O12 is found to reside at the octahedral 96h site, away from the central octahedral 48g site, while the remaining lithium resides at the tetrahedral 24d site. Such kind of lithium distribution leads to high lithium-ion mobility, which is the origin of the high conductivity; the highest lithium-ion conductivity of 1.46 mS/cm at 25 °C is found to be achieved for Li7-3xGaxLa3Zr2O12 at x = 0.25. Additionally, there are two lithium-ion migration pathways in the Li7-3xGaxLa3Zr2O12 garnets: 96h-96h and 24d-96h-24d, but the lithium ions transporting through the 96h-96h pathway determine the overall conductivity.
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