锂(药物)
结构精修
离子电导率
中子衍射
离子
八面体
快离子导体
电导率
离子键合
结晶学
化学
电解质
材料科学
无机化学
晶体结构
物理化学
内分泌学
医学
有机化学
电极
作者
Guowei Zhao,Kota Suzuki,Masao Yonemura,Masaaki Hirayama,Ryoji Kanno
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2019-08-07
卷期号:2 (9): 6608-6615
被引量:35
标识
DOI:10.1021/acsaem.9b01152
摘要
Codoping the lithium superionic conductor (LISICON) Li3.75Ge0.75P0.25O4 system with various aliovalent cations M (M = Mg2+, B3+, Al3+, Ga3+, and V5+) was conducted via a solid-state reaction method following the chemical formula Li3.75±y(Ge0.75P0.25)1–xMxO4 to obtain high-conductivity lithium ionic conductors. The highest ionic conductivity (5.1 × 10–5 S cm–1) was obtained at 25 °C for Li3.53(Ge0.75P0.25)0.7V0.3O4, which also exhibited low activation energy of 0.43(2) eV. Rietveld refinement using neutron diffraction data revealed that the Ge4+, P5+, and V5+ cations occupied the same crystallographic site, and their ratios were consistent with the nominal ratios of Li3.53(6)Ge0.5264(17)P0.1743(12)V0.2993(7)O4. Compared with the framework of γ-Li3PO4, which has only two fully occupied crystallographically different tetrahedral site lithium ions (Li: 8d, Li2: 4c), two additional partially occupied crystallographic octahedral lithium ion sites that dominantly contribute to lithium conduction were detected. The codoping strategy contributed to the compositional and structural optimization of the LISICON system, affording enhanced ion-conducting properties.
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