电解质
离子电导率
尖晶石
离子
电化学窗口
电导率
离子键合
电化学
材料科学
无机化学
快离子导体
化学工程
化学
电极
冶金
物理化学
工程类
有机化学
作者
Jiahui Liu,Shuo Wang,Yoshiyuki Kawazoe,Qiang Sun
出处
期刊:ACS materials letters
[American Chemical Society]
日期:2023-03-07
卷期号:5 (4): 1009-1017
被引量:7
标识
DOI:10.1021/acsmaterialslett.3c00119
摘要
Halide materials are of current interest as solid electrolytes for all-solid-state sodium-ion batteries (ASIBs), due to their good balance between ionic conductivity and electrochemical stability. In this work, by using density functional theory combined with deep potential model and grand potential phase diagram analysis, we report a new spinel chloride (Na2Y2/3Cl4) and systemically evaluate its potential for the solid electrolyte. The spinel Na2Y2/3Cl4 exhibits a high ionic conductivity of 0.94 mS/cm at room temperature and has a three-dimensional isotropic diffusion network comprised of face-sharing octahedra and tetrahedra. Further analysis of the diffusion mechanism indicates that the Na+ conductivity mainly derives from Na ions in the 8a site while the Na ions in the 16d site are mainly used for forming the rhombus skeleton. Besides, the spinel Na2Y2/3Cl4 has a wide electrochemical window of 0.59–3.76 V and good interfacial stability with high-voltage cathodes, which ensures its ability to improve the energy density of ASIBs. This study demonstrates the promising application of the spinel framework in sodium solid electrolytes and sheds new light on developing the halide-based solid electrolyte for ASIBs.
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