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The role of Li site occupancy on the Li-ion conductivity of Ta-doped Li6.75La3Zr1.75Ta0.25O12 solid electrolyte materials with high Li concentrations
Solid State Ionics ( IF 3.0 ) Pub Date : 2021-07-18 , DOI: 10.1016/j.ssi.2021.115713
Xingxing Zhang 1 , Cheng Li 2 , Weili Liu 1 , Tae-Sik Oh 3 , Jeffrey W. Fergus 1
Affiliation  

Garnet-type Li7La3Zr2O12 has attracted much attention because of its promising properties of high ionic conductivity, good chemical stability against Li metal, and good mechanical strength. To better understand the Li conduction mechanism, the Li site occupancy and Li-ion conductivity are studied with a high Li concentration in the range of 6.70–7.15 mol per formula unit. Aluminum and silicon, which presumably were transferred to the sample from the Al2O3 crucible during processing, were included in the cubic garnet structure for the Rietveld refinements. The Li-ion conductivity increases with the occupancy of the octahedral Li site (Occupancy: 0.78–0.87, Li-ion conductivity: 3–5 × 10−4 S/cm). As the lithium content increases, the portion of lithium occupying the 96 h octahedral site increases and that occupying the 24d tetrahedral site decreases.



中文翻译:

Li位点占有率对高Li浓度Ta掺杂Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12固体电解质材料锂离子电导率的影响

石榴石型Li 7 La 3 Zr 2 O 12因其高离子电导率、对锂金属良好的化学稳定性和良好的机械强度而备受关注。为了更好地理解锂的传导机制,我们研究了每分子式单位 6.70-7.15 摩尔范围内的高锂浓度下的锂位点占有率和锂离子电导率。铝和硅,大概是从 Al 2 O 3转移到样品坩埚在加工过程中被包含在立方石榴石结构中,用于 Rietveld 细化。锂离子电导率随着八面体锂位点的占有率而增加(占有率:0.78-0.87,锂离子电导率:3-5 × 10 -4  S/cm)。随着锂含量的增加,占据96h八面体位置的锂部分增加,占据24d四面体位置的锂部分减少。

更新日期:2021-07-19
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